Develop Reference

Getting null pointer exception while creating JSONRPCCLIENT object in bitcoind

Class for creation of JsonRpcClient object for connecting my application by bitcoin test net
already installed bitcoind and sync it with testnet as well from main network of bitcoin.
Trying to create unique wallet address but getting null pointer exception as i can observe values are not being used from application.properties file i m using spring tool suite and maven dependencywf.bitcoin
bitcoin-rpc-client
1.1.0
package bitcoin.utils;
import java.net.URL;
import java.util.Properties;
import javax.annotation.PostConstruct;
import javax.naming.CommunicationException;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;
import wf.bitcoin.javabitcoindrpcclient.BitcoinJSONRPCClient;
import wf.bitcoin.javabitcoindrpcclient.BitcoinRPCException;
#Configuration
#Component
public class ResourceUtils {
private static final Logger logger = LoggerFactory.getLogger(ResourceUtils.class);
#Value("${node.bitcoind.rpc.protocol}")
private static String protocol;
#Value("${node.bitcoind.rpc.host}")
private static String host;
#Value("${node.bitcoind.rpc.port}")
private static String port;
#Value("${node.bitcoind.rpc.user}")
private static String user;
#Value("${node.bitcoind.rpc.password}")
private static String password;
#Value("${node.bitcoind.http.auth_scheme}")
private static String authScheme;
private static Properties nodeConfig;
#PostConstruct
void init() {
logger.info("in init {}", "in init");
nodeConfig = new Properties();
nodeConfig.setProperty("node.bitcoind.rpc.protocol", protocol);
logger.debug("protocol==============================================={}", protocol);
nodeConfig.setProperty("node.bitcoind.rpc.host", host);
logger.debug("host==============================================={}", host);
nodeConfig.setProperty("node.bitcoind.rpc.port", port);
logger.debug("port==============================================={}", port);
nodeConfig.setProperty("node.bitcoind.rpc.user", user);
logger.debug("user==============================================={}", user);
nodeConfig.setProperty("node.bitcoind.rpc.password", password);
logger.debug("password==============================================={}", password);
nodeConfig.setProperty("node.bitcoind.http.auth_scheme", authScheme);
logger.debug("authScheme==============================================={}", authScheme);
}
public ResourceUtils() {
}
public static CloseableHttpClient getHttpProvider() {
PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager();
return HttpClients.custom().setConnectionManager(connManager).build();
}
public static BitcoinJSONRPCClient getBtcdProvider() throws BitcoinRPCException, CommunicationException {
logger.info("getHttpProvider {}", getHttpProvider());
logger.info("getNodeConfig {}", getNodeConfig());
BitcoinJSONRPCClient bitcoinJsonRpcClient = null;
try {
URL url = new URL(protocol + "://" + user + ':' + password + "#" + host + ":" + port + "/");
bitcoinJsonRpcClient = new BitcoinJSONRPCClient(url);
logger.info("btcdClientt {}", bitcoinJsonRpcClient);
// bitcoinJsonRpcClient.setTxFee(BigDecimal.valueOf(0.001));
} catch (Exception e) {
return bitcoinJsonRpcClient;
}
return bitcoinJsonRpcClient;
}
public static Properties getNodeConfig() {
return nodeConfig;
}
}
Configuration File
node.bitcoind.rpc.protocol = http
node.bitcoind.rpc.host = 127.0.0.1
node.bitcoind.rpc.port = 8332
node.bitcoind.rpc.user = username
node.bitcoind.rpc.password = password
node.bitcoind.http.auth_scheme = Basic
Bitcoin.config file
rpcuser=user
rpcpassword=password
testnet=1
rpcport=8332
rpcallowip=127.0.0.1
rpcallowip=195.154.11.93
server=1
Methode for getting bitcoin wallet address
public String generateWalletAddress(String id) {
try {
BitcoinJSONRPCClient client = ResourceUtils.getBtcdProvider();
return client.getNewAddress();
} catch (CommunicationException c) {
System.err.println(c);
return null;
}
}
Stack Trace
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-02-12 11:50:45.205 ERROR 10991 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceUtils': Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:160) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:416) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at bitcoin.BitcoinApplication.main(BitcoinApplication.java:10) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_242]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_242]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_242]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_242]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.2.4.RELEASE.jar:2.2.4.RELEASE]
Caused by: java.lang.NullPointerException: null
at java.util.Hashtable.put(Hashtable.java:460) ~[na:1.8.0_242]
at java.util.Properties.setProperty(Properties.java:166) ~[na:1.8.0_242]
at bitcoin.utils.ResourceUtils.init(ResourceUtils.java:47) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_242]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_242]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_242]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_242]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:389) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:333) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:157) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE]
... 23 common frames omitted

I got my solution actually the problem was of version i was using rpcport
which is changed to test.rpcport for test net from bitcoind version 17.0
hence bean were not getting the connection from my localhost server causing null pointer exception.

How to use HibernateCursorItemReader in spring batch

In a spring batch job, I have a step in which I want to read data by chunk from the database using Hibernate, process it and write it back to the database. Right now I'm having some trouble setting up the reader :
#EnableBatchProcessing
#Configuration
#ComponentScan(basePackages = {"com.x.y.z.database", "com.x.y.p.database"}, excludeFilters={
#ComponentScan.Filter(type= FilterType.ASSIGNABLE_TYPE, value=ConfigHelperMail.class)})
#EntityScan(basePackages = {"com.x.y.z.database", "com.x.y.p.database"})
#EnableJpaRepositories({"com.x.y.z.database", "com.x.y.p.database"})
public class BatchConfiguration {
#Autowired
public JobBuilderFactory jobs;
#Bean
public Job job(CustomJobListener listener,
#Qualifier("step1") Step step1,
#Qualifier("step2") Step step2,
#Qualifier("step3") Step step3) {
return jobs.get("SimpleJobName")
.incrementer(new RunIdIncrementer())
.preventRestart()
.listener(listener)
.start(step1)
.next(step2)
.next(step3)
.build();
}
}
In step1 writer I save the data to the database using Hibernate :
#Entity
#Table(name = "tmp_z_stepone")
public class StepOneEntity {
#Id
#Column(name = "reference")
private String reference;
/** Other properties and getters and setters **/
}
#Component
public class StepOneWriter implements ItemWriter<StepOneEntity> {
#Autowired
private StepOneService stepOneService;
#Override
public void write (List<? extends StepOneEntity> items) throws WriterException {
stepOneService.saveMany(items);
}
}
StepOneService is annotated with #Service and it uses a DAO interface that extends CrudRepository<StepOneEntity, String> and its saveMany method just uses the save method from CrudRepository<StepOneEntity, String>.
Step 2
#Component
public class StepOne {
#Autowired
private StepTwoReader reader;
#Autowired
private StepTwoProcessor processor;
#Autowired
private StepTwoWriter writer;
#Bean
#JobScope
#Qualifier("step2")
public Step step2() throws ReaderException {
return stepBuilderFactory.get("step2")
.<StepOneEntity, StepTwoEntity>chunk(10)
.reader(reader.read())
.processor(processor)
.writer(writer)
.build();
}
}
#Component
public class StepTwoReader {
public ItemReader<OutputControleFormat> read () throws ReaderException {
HibernateCursorItemReader itemReader = new HibernateCursorItemReader();
itemReader.setQueryString("from tmp_z_stepone");
itemReader.setUseStatelessSession(true);
return itemReader;
}
}
I think I'm missionf some session/ORM configuration but I don't know where, the error is below :
org.springframework.batch.item.ItemStreamException: Failed to initialize the reader
at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:147) ~[spring-batch-infrastructure-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:96) ~[spring-batch-infrastructure-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.core.step.item.ChunkMonitor.open(ChunkMonitor.java:114) ~[spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:96) ~[spring-batch-infrastructure-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.core.step.tasklet.TaskletStep.open(TaskletStep.java:310) ~[spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:197) ~[spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_92]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_92]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_92]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_92]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at com.sun.proxy.$Proxy110.execute(Unknown Source) [na:na]
at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148) [spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.core.job.AbstractJob.handleStep(AbstractJob.java:392) [spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.core.job.SimpleJob.doExecute(SimpleJob.java:135) [spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:306) [spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135) [spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) [spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128) [spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_92]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_92]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_92]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_92]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) [spring-batch-core-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at com.sun.proxy.$Proxy107.run(Unknown Source) [na:na]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.execute(JobLauncherCommandLineRunner.java:211) [spring-boot-autoconfigure-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.executeLocalJobs(JobLauncherCommandLineRunner.java:227) [spring-boot-autoconfigure-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.launchJobFromProperties(JobLauncherCommandLineRunner.java:123) [spring-boot-autoconfigure-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.run(JobLauncherCommandLineRunner.java:117) [spring-boot-autoconfigure-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:732) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:716) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:703) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:304) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at com.cdn.oxc.signature.ApplicationConfig.main(ApplicationConfig.java:33) [classes/:na]
Caused by: java.lang.NullPointerException: null
at org.springframework.batch.item.database.HibernateItemReaderHelper.createQuery(HibernateItemReaderHelper.java:141) ~[spring-batch-infrastructure-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.item.database.HibernateItemReaderHelper.getForwardOnlyCursor(HibernateItemReaderHelper.java:125) ~[spring-batch-infrastructure-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.item.database.HibernateCursorItemReader.doOpen(HibernateCursorItemReader.java:185) ~[spring-batch-infrastructure-3.0.8.RELEASE.jar:3.0.8.RELEASE]
at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:144) ~[spring-batch-infrastructure-3.0.8.RELEASE.jar:3.0.8.RELEASE]
... 46 common frames omitted

HibernateCursorItemReader implements the InitializingBean interface, which means that Spring will call its afterPropertiesSet on container initialization if it is declared as a bean. However, in your case, the HibernateCursorItemReader is not declared as a bean in the application context, it is wrapped in a class (StepTwoReader) then created with reader.read().
If you declare the HibernateCursorItemReader as a bean with your current code in your read method, you should get an IllegalStateException with message: "A SessionFactory must be provided". You actually need to configure a SessionFactory for your Hibernate reader.
Another option is to use the HibernateCursorItemReaderBuilder which will ensure the reader is correctly configured.

#StepScope
#Slf4j
#Component
public class CursorItemReader extends HibernateCursorItemReader<ItemEntity> {
public CursorItemReader(EntityManagerFactory entityManagerFactory,
#Value("#{stepExecution}")StepExecution stepExecution) {
this.setName("CursorItemReader");
this.setSessionFactory(entityManagerFactory.createEntityManager().unwrap(org.hibernate.Session.class).getSessionFactory());
this.setQueryString("from ItemEntity");
this.setUseStatelessSession(true);
this.setFetchSize(5);
}
#Override
public ItemEntity read() throws Exception {
ItemEntity item = this.doRead();
return item;
}
}
You can also refer-
https://docs.spring.io/spring-batch/docs/current/reference/html/readersAndWriters.html#HibernateCursorItemReader

Spring data JPA findFirst with where clause (filtering) and order by, internal exception thrown

I created the following repository
public interface DemoRepository extends CrudRepository<DemoEntity, DemoId> {
Optional<DemoEntity> findFirstByPositionIsNotNullOrderByIdCompositeFieldIdDesc(Long compositeFieldId);
}
And the entity class:
#Entity
#Table(name = "demo")
public class DemoEntity {
#EmbeddedId
private DemoId id;
#Column(name = "result_position")
private Integer position;
public DemoEntity() {
}
public DemoEntity(DemoId id) {
this.id = id;
}
public DemoId getId() {
return id;
}
public void setId(final DemoId id) {
this.id = id;
}
public Integer getPosition() {
return position;
}
public void setPosition(final Integer position) {
this.position = position;
}
}
And the composite id of the entity class:
#Embeddable
public class DemoId implements Serializable {
private static final long serialVersionUID = 4782012819350949578L;
#Column
private Long compositeFieldId;
#Column
private Long compositeFieldIdSecond;
public DemoId() {}
public DemoId(final Long compositeFieldId, final Long compositeFieldIdSecond) {
this.compositeFieldId = compositeFieldId;
this.compositeFieldIdSecond = compositeFieldIdSecond;
}
public Long getCompositeFieldId() {
return compositeFieldId;
}
public void setCompositeFieldId(final Long compositeFieldId) {
this.compositeFieldId = compositeFieldId;
}
public Long getCompositeFieldIdSecond() {
return compositeFieldIdSecond;
}
public void setCompositeFieldIdSecond(final Long compositeFieldIdSecond) {
this.compositeFieldIdSecond = compositeFieldIdSecond;
}
}
The Spring Boot 1.5.9 (which includes sprint-data-jpa 1.11.9) app starts successfully.
When I call an endpoint which is invoking my new repository method I get an exception:
Caused by: java.util.NoSuchElementException: null
at java.util.ArrayList$Itr.next(ArrayList.java:860)
at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1042)
at org.springframework.data.jpa.repository.query.CriteriaQueryParameterBinder.bind(CriteriaQueryParameterBinder.java:65)
at org.springframework.data.jpa.repository.query.ParameterBinder.bind(ParameterBinder.java:101)
at org.springframework.data.jpa.repository.query.ParameterBinder.bindAndPrepare(ParameterBinder.java:161)
at org.springframework.data.jpa.repository.query.ParameterBinder.bindAndPrepare(ParameterBinder.java:152)
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$QueryPreparer.invokeBinding(PartTreeJpaQuery.java:236)
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$QueryPreparer.createQuery(PartTreeJpaQuery.java:157)
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.doCreateQuery(PartTreeJpaQuery.java:86)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.createQuery(AbstractJpaQuery.java:190)
at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:208)
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:87)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:116)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:106)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:499)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:477)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:56)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy119.findFirstByPositionIsNotNullOrderByIdCompositeFieldIdDesc(Unknown Source)
at io.demo.db.services.PlayerService.hasPlayedRecently(PlayerService.java:56)
at io.demo.db.services.PlayerService$$FastClassBySpringCGLIB$$9179d222.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673)
at io.demo.db.services.DemoService$$EnhancerBySpringCGLIB$$139c2adc.hasPlayedRecently(<generated>)
at io.demo.rest.DemoController.subscribe(DemoController.java:80)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
... 85 common frames omitted
The exception kinda makes sense as the query should return no result in my test, but I would expect to get an empty optional instead of an exception.
Is this a bug or I am mis-using Spring Data? The db is mysql 5.7.
I then tried to upgrade to Spring Boot 2.0 which includes Spring Data Jpa 2.0.5, now the app fails to create the repository during start up:
Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.Optional io.demo.db.repositories.DemoRepository.findFirstByPositionIsNotNullOrderByIdCompositeFieldIdDesc(java.lang.Long)! Index: 0, Size: 0
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:82)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:103)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:208)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:79)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:553)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery$1(RepositoryFactorySupport.java:546)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at java.util.Collections$UnmodifiableCollection$1.forEachRemaining(Collections.java:1049)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:548)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new$0(RepositoryFactorySupport.java:538)
at java.util.Optional.map(Optional.java:215)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:538)
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:317)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$3(RepositoryFactoryBeanSupport.java:287)
at org.springframework.data.util.Lazy.getNullable(Lazy.java:141)
at org.springframework.data.util.Lazy.get(Lazy.java:63)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:290)
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:102)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1769)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1706)
... 35 common frames omitted
Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)
at java.util.Collections$UnmodifiableList.get(Collections.java:1309)
at org.springframework.data.jpa.repository.query.QueryParameterSetterFactory$CriteriaQueryParameterSetterFactory.create(QueryParameterSetterFactory.java:271)
at org.springframework.data.jpa.repository.query.ParameterBinderFactory.lambda$createQueryParameterSetter$1(ParameterBinderFactory.java:138)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Spliterators$ArraySpliterator.tryAdvance(Spliterators.java:958)
at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)
at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464)
at org.springframework.data.jpa.repository.query.ParameterBinderFactory.createQueryParameterSetter(ParameterBinderFactory.java:140)
at org.springframework.data.jpa.repository.query.ParameterBinderFactory.lambda$createSetters$0(ParameterBinderFactory.java:130)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1380)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at org.springframework.data.jpa.repository.query.ParameterBinderFactory.createSetters(ParameterBinderFactory.java:131)
at org.springframework.data.jpa.repository.query.ParameterBinderFactory.createSetters(ParameterBinderFactory.java:123)
at org.springframework.data.jpa.repository.query.ParameterBinderFactory.createCriteriaBinder(ParameterBinderFactory.java:75)
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$QueryPreparer.getBinder(PartTreeJpaQuery.java:248)
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$QueryPreparer.<init>(PartTreeJpaQuery.java:147)
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery$CountQueryPreparer.<init>(PartTreeJpaQuery.java:268)
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:77)
... 61 common frames omitted
Still don't get why as the exception is not descriptive.
Thank you.

Found the issue, my repository method expects a parameter which is not needed by the query itself. Anyway the exception reported by Spring Data is a bit confusing, I've logged a bug in their bugtracker and they are looking at it: https://jira.spring.io/browse/DATAJPA-1281

Spring #Transactional em.getDelegate sometimes return null

I have next method inside #Service bean:
#Transactional(readOnly = false, propagation = Propagation.REQUIRES_NEW)
public void save (String lsk) {
Session sess = (Session)em.getDelegate(); <--Error!
Sometimes (randomly) it throws error exception:
--- [nio-8080-exec-1] o.s.t.i.TransactionInterceptor : Application exception overridden by rollback exception
java.lang.NullPointerException: null
at org.hibernate.engine.internal.StatefulPersistenceContext.clear(StatefulPersistenceContext.java:235) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.internal.SessionImpl.internalClear(SessionImpl.java:395) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.internal.SessionImpl.clear(SessionImpl.java:391) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at com.ric.bill.ChrgServ.save(ChrgServ.java:227) ~[classes/:na]
at com.ric.bill.ChrgServ$$FastClassBySpringCGLIB$$67dcba28.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720) ~[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) [spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) [spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) [spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655) [spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at com.ric.bill.ChrgServ$$EnhancerBySpringCGLIB$$b101e62c.save(<generated>) [classes/:na]
at com.ric.bill.BillServ.chrgHouse(BillServ.java:121) [classes/:na]
at com.ric.bill.BillServ.chrgAll(BillServ.java:88) [classes/:na]
at com.ric.web.GreetingController.greeting(GreetingController.java:81) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_60]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_60]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_60]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_60]
Why does it happen, I don't know.
I use Hibernate 5.1.0.Final, Java 1.8, Spring framework 4.2.5.RELEASE,
Oracle 11 G
Any help will be great.
Upd:
#Service
public class ChrgServ {
#Autowired
private ApplicationContext ctx;
#PersistenceContext
private EntityManager em;

Nested exception is org.hibernate.exception.GenericJDBCException: could not execute statement

I was kind of roped into using maven, Hibernate, spring and JPA repositories in a small project. I cheerfully assumed that information found here
http://docs.spring.io/spring-data/jpa/docs/1.4.2.RELEASE/reference/html/jpa.repositories.html
will be enough to create at least a simple application. Unluckily that's not the case. I've managed to read data from a MySQL database, but as for now have been unable to insert any data.
Here is a simple 'User' model class.
#Entity
#Table(name = "ctuser")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long uid;
#Column(name = "Gmail", nullable = false)
private String gmail;
public String getGmail() {
return gmail;
}
public void setGmail(String gmail) {
this.gmail = gmail;
}
#Override
public String toString() {
return getGmail();
}
}
I've created an appropriate repository interface...
package put.io.come_together.service.persistance.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import put.io.come_together.model.User;
public interface UserRepository extends JpaRepository<User, Long> {
User findUserByUid(long uid);
User save (User obj);
}
...an interface for the service...
public interface UserService {
User getUser(long uid);
User addUser(User obj);
List<User> getAll();
}
...and implementation of the interface.
#Service
public class UserServiceImpl implements UserService {
private final UserRepository userRepository;
#Autowired
public UserServiceImpl(UserRepository userRepository) {
this.userRepository = userRepository;
}
#Override
public User getUser(long uid) {return userRepository.findUserByUid(uid);
}
#Transactional
#Override
public User addUser(User obj) {return this.userRepository.saveAndFlush(obj);}
#Override
public List<User> getAll() {
return userRepository.findAll();
}
Finally I'm trying to present as the data as well as insert something into database.
#Controller
public class HomePageController {
#Autowired
private UserService userService;
private static final String USER_MAP_KEY = "groups";
private static final String USER_LIST_TEMPLATE_NAME = "groupList";
#RequestMapping("/")
String hello(Map<String, Object> model) {
User osoba = new User();
osoba.setGmail("ADAMWEST");
userService.addUser(osoba);
List<User> userGroupsList = userService.getAll();
model.put(USER_MAP_KEY, userGroupsList);
return USER_LIST_TEMPLATE_NAME;
}
}
If I leave out the userService.addUser(osoba); line, everything works fine. I can see the data read from the database neatly laid out. But when I try to actually use the .addUser() method my localhost puts out a white label error page.
White label Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sun Apr 19 09:36:52 CEST 2015
There was an unexpected error (type=Internal Server Error, status=500).
could not execute statement; nested exception is org.hibernate.exception.GenericJDBCException: could not execute statement
Would you kindly tell me what is it that I'm doing wrong? I've been trying to solve the problem for some time now, and thoroughly lost hope.
Here is the stack trace of the exception. The error concerns field 'UID' not having a default value, but I marked it as an #Id field. I also dropped the entire database and set it up again, seeing as it helped someone with a similar problem.
java.sql.SQLException: Field 'UID' doesn't have a default value
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2141)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2077)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2062)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3032)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3558)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:98)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:492)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:197)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:181)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:216)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:324)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:
288)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125
)
at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.jav
a:84)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:2
06)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(Extend
edEntityManagerCreator.java:344)
at com.sun.proxy.$Proxy78.persist(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEnti
tyManagerCreator.java:291)
at com.sun.proxy.$Proxy78.persist(Unknown Source)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:407)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.saveAndFlush(SimpleJpaRepository.java:421
)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.exec
uteMethodOn(RepositoryFactorySupport.java:416)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doIn
voke(RepositoryFactorySupport.java:401)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invo
ke(RepositoryFactorySupport.java:373)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$DefaultMethodInvokingMethodIntercep
tor.invoke(RepositoryFactorySupport.java:486)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterce
ptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspec
tSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTransla
tionInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingM
ethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.java:122)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy80.saveAndFlush(Unknown Source)
at put.io.come_together.service.persistance.impl.UserServiceImpl.addUser(UserServiceImpl.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:
190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterce
ptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspec
tSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy83.addUser(Unknown Source)
at put.io.come_together.controller.HomePageController.hello(HomePageController.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:13
7)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletIn
vocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(Request
MappingHandlerAdapter.java:777)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMapp
ingHandlerAdapter.java:706)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.j
ava:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

You said Hibernate that the ID was autogenerated using the strategy AUTO. This strategy, with MySQL, consists in letting the database generate the ID using an auto-increment column. So if you haven't defined uid as auto-increment, that won't work.