I am working on Spring Boot project. I have repository file in my project but it will show me a warning message in repository class Unnecessary #Repository. I am extending a JpaRepository<> with my repository. My Spring version is 4 and JDK version is 17.
Here is my dependencies
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
Here is my repository
#Repository // Here I get a warning to remove this annotation becasue its unnecessary
public interface CollegeRepo extends JpaRepository<College, Integer>{
}
You are extending JpaRepository<T, ID> interface, it means that spring boot must autoconfigure this repository bean for you, namely, it will be configured a proxy bean of SimpleJpaRepository<T, ID>.
In simple words, we do not just create a bean using #Repository or #Component annotation, we extend the spring-data interface and then our repository bean will be autoconfigured.
When to use #Repository
You want to provide your own implementation of how to access the data layer and what should be done. In this case marking your implementation class with #Repository will allow you to have this class managed by spring so that you can autowire necessary fields to access data layer like EntityManager , JdbcTemplate ...etc. Although Component, and #Repository in the most fundamental level just register spring beans there are some slight enhancements using #Repository which might make it neccessary to use and also best practice in the current case.
As per doc1
A class thus annotated with #Repository is eligible for Spring
DataAccessException translation when used in conjunction with a
PersistenceExceptionTranslationPostProcessor.,
and doc2
PersistenceExceptionTranslationPostProcessor
Bean post-processor that
automatically applies persistence exception translation to any bean
marked with Spring's #Repository annotation, adding a corresponding
PersistenceExceptionTranslationAdvisor to the exposed proxy
Example of above case use with #Repository.
#Repository
public class CustomCarRepositoryImpl implements CustomCarRepository {
#PersistenceContext
private EntityManager entityManager;
#Override
public List<CarEntity> findCarsWithSpeed(Integer speed) {
return entityManager.createQuery("Query to execute")
.setMaxResults(50).getResultList();
}
}
public interface CustomCarRepository {
List<CarEntity> findCarsWithSpeed(Integer speed);
}
Then you can autowire in your other components the CustomCarRepository and access the data layer as you have implemented.
When Not to use #Repository
When you just declare your interface and you extend from any Spring child interface of Repository from org.springframework.data.repository.
Example
public interface CarRepository extends JpaRepository<CarEntity, Long> {
List<CarEntity> findCarsWithSpeed(Integer speed);
}
In that case Spring Boot will be able to create the repository bean for you automatically from auto configuration.
The only further action needed is if your own interfaces extending from Repository do not exist in the same package or subpackage of where your #Configuration or #SpringBootApplication exists then you would need
either #EnableJpaRepositories(basePackages = {"base-package-where-repositories-exist"})
or #AutoConfigurationPackage(basePackages = {"base-package-where-repositories-exist"})
as to help spring boot identify the package it should look for the auto configuration of that repository. ( The later #AutoConfigurationPackage will affect both repositories and other things required for auto configuration like entities scan and more. So it should be used with care in a project and not just for repositories.)
The Solution depends upon what type of database you intend to use. "Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured." Error you're getting is because you have not set the url for the database in the application.properties. To solve this issue I would recommend you to Open the application.properties and add the following according to your system:
spring.datasource.url=jdbc:mysql://localhost:3306/restapi
spring.datasource.username=root
spring.datasource.password=
I am following https://spring.io/guides/gs/relational-data-access/ so in my main class I have:
#SpringBootApplication
#ComponentScan(basePackages = {"com.example"})
public class SpringGuideApplication implements CommandLineRunner {
private static final Logger log = LoggerFactory.getLogger(SpringGuideApplication.class);
#Autowired
JdbcTemplate jdbcTemplate;
public static void main(String[] args) {
SpringApplication.run(SpringGuideApplication.class, args);
}
#Override
public void run(String... strings) throws Exception {
log.info("Creating tables");
jdbcTemplate.execute("DROP TABLE clients IF EXISTS");
}
}
and at this point I receive error:
***************************
APPLICATION FAILED TO START
***************************
Description:
Field jdbcTemplate in com.example.spring_guide.SpringGuideApplication required a bean of type 'org.springframework.jdbc.core.JdbcTemplate' that could not be found.
The injection point has the following annotations:
- #org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'org.springframework.jdbc.core.JdbcTemplate' in your configuration.
Process finished with exit code 1
I understand error but to create #Bean JdbcTemplate I need to use:
#Bean
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
return new JdbcTemplate(dataSource);
}
but I don't want, I don't want any dataSource file I would like to have just in memory database. Is there any way to create JdbcTemplate bean without DataSource? Any how is this tutorial even work?
In pom.xml now I have:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.10.RELEASE</version>
</dependency>
but also tried with
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
<version>2.4.0</version>
</dependency>
without success.
That is the beauty of Spring-Boot. It saw you are using JdbcTemplate so it need to create datasource and since you didn't provide any information, it is failing. Even though you are using in memory database you need to provide these info, so spring-boot can create JdbcTemplate for you. I am not sure which in memory db you are using, but here is an example on how to use with H2. You can find these info on individual dB user documentation.
spring.datasource.url=jdbc:h2:mem:yourdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
I want to set up the database connection on Spring MVC with PostgreSQL, how do I do it?
I have tried google search but still, I have not found what I am looking for, so far I have added a PostgreSQL dependency on my project and here are the codes
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.4-1206-jdbc42</version>
</dependency>
So where do I go from here?
how do I create the configuration files for db?
What is the default login credentials for db?
Where do I see the database table?
You need to configure your database connection. You can create a classe to configure this. For example:
#Configuration
public class DatabaseConfig {
#Bean
public DriverManagerDataSource getDataSource() {
DriverManagerDataSource bds = new DriverManagerDataSource();
bds.setDriverClassName("org.postgresql.Drive");
bds.setUrl("jdbc:mysql://localhost:5432/dbname");
bds.setUsername("user");
bds.setPassword("pass");
return bds;
}
}
And then, you can inject the datasource in your bens.
#Controller
public class MyController {
#Autowired
private DataSource dataSource;
}
Try to use Spring boot with spring data. Is very simple to configure a database connection and create repositories for data manipulations (CRUD). See this https://dzone.com/articles/spring-boot-with-spring-data-jpa
I have written the url, username etc of the database in application.properties file. I have also defined #Autowired annotation in the controller for JdbcTemplate. But now when I execute, I get this error-
APPLICATION FAILED TO START
Description:
Field jdbc in com.sab.Controller required a bean of type 'org.springframework.jdbc.core.JdbcTemplate' that could not be found.
- Bean method 'jdbcTemplate' not loaded because #ConditionalOnSingleCandidate (types: javax.sql.DataSource; SearchStrategy: all) did not find any beans
Action:
Consider revisiting the conditions above or defining a bean of type org.springframework.jdbc.core.JdbcTemplate in your configuration.
Can anyone help me to resolve this error.
You need to define a Spring bean of type JdbcTemplate. You can do that by adding a #Bean method to your Spring Boot application class that creates and returns a JdbcTemplate. For example:
#SpringBootApplication
public class ExampleApplication {
#Bean
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
return new JdbcTemplate(dataSource);
}
public static void main(String[] args) {
SpringApplication.run(ExampleApplication.class, args);
}
}
Also, if you haven't already done so, you have to add the properties for the database connection to the file src/main/resources/application.properties. Spring Boot uses these to create the DataSource bean. For example (you need to put the appropriate values in here; this is an example for using an H2 in-memory database):
spring.datasource.url=jdbc:h2:mem:demo
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver
Finally, you need to make sure that you have a dependency on the appropriate database driver in your pom.xml. For example (for the H2 database), you need to have this in the dependencies section of pom.xml:
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
I am trying run a spring-boot application which uses hibernate via spring-jpa, but i am getting this error:
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:104)
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:71)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:205)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1885)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1843)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:843)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:398)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:842)
at org.hibernate.jpa.HibernatePersistenceProvider.createContainerEntityManagerFactory(HibernatePersistenceProvider.java:152)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:336)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1613)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1550)
... 21 more
my pom.xml file is this:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.1.8.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-taglibs</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
</dependency>
</dependencies>
my hibernate configuration is that (the dialect configuration is in the last method from this class):
#Configuration
#EnableTransactionManagement
#ComponentScan({ "com.spring.app" })
public class HibernateConfig {
#Bean
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(restDataSource());
sessionFactory.setPackagesToScan(new String[] { "com.spring.app.model" });
sessionFactory.setHibernateProperties(hibernateProperties());
return sessionFactory;
}
#Bean
public DataSource restDataSource() {
BasicDataSource dataSource = new BasicDataSource();
dataSource.setDriverClassName("org.postgresql.Driver");
dataSource.setUrl("jdbc:postgresql://localhost:5432/teste?charSet=LATIN1");
dataSource.setUsername("klebermo");
dataSource.setPassword("123");
return dataSource;
}
#Bean
#Autowired
public HibernateTransactionManager transactionManager(SessionFactory sessionFactory) {
HibernateTransactionManager txManager = new HibernateTransactionManager();
txManager.setSessionFactory(sessionFactory);
return txManager;
}
#Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
return new PersistenceExceptionTranslationPostProcessor();
}
Properties hibernateProperties() {
return new Properties() {
/**
*
*/
private static final long serialVersionUID = 1L;
{
setProperty("hibernate.hbm2ddl.auto", "create");
setProperty("hibernate.show_sql", "false");
setProperty("hibernate.dialect", "org.hibernate.dialect.PostgreSQLDialect");
}
};
}
}
what I am doing wrong here?
First remove all of your configuration Spring Boot will start it for you.
Make sure you have an application.properties in your classpath and add the following properties.
spring.datasource.url=jdbc:postgresql://localhost:5432/teste?charSet=LATIN1
spring.datasource.username=klebermo
spring.datasource.password=123
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.show-sql=false
spring.jpa.hibernate.ddl-auto=create
If you really need access to a SessionFactory and that is basically for the same datasource, then you can do the following (which is also documented here although for XML, not JavaConfig).
#Configuration
public class HibernateConfig {
#Bean
public HibernateJpaSessionFactoryBean sessionFactory(EntityManagerFactory emf) {
HibernateJpaSessionFactoryBean factory = new HibernateJpaSessionFactoryBean();
factory.setEntityManagerFactory(emf);
return factory;
}
}
That way you have both an EntityManagerFactory and a SessionFactory.
UPDATE: As of Hibernate 5 the SessionFactory actually extends the EntityManagerFactory. So to obtain a SessionFactory you can simply cast the EntityManagerFactory to it or use the unwrap method to get one.
public class SomeHibernateRepository {
#PersistenceUnit
private EntityManagerFactory emf;
protected SessionFactory getSessionFactory() {
return emf.unwrap(SessionFactory.class);
}
}
Assuming you have a class with a main method with #EnableAutoConfiguration you don't need the #EnableTransactionManagement annotation, as that will be enabled by Spring Boot for you. A basic application class in the com.spring.app package should be enough.
#Configuration
#EnableAutoConfiguration
#ComponentScan
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
}
Something like that should be enough to have all your classes (including entities and Spring Data based repositories) detected.
UPDATE: These annotations can be replaced with a single #SpringBootApplication in more recent versions of Spring Boot.
#SpringBootApplication
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
}
I would also suggest removing the commons-dbcp dependency as that would allow Spring Boot to configure the faster and more robust HikariCP implementation.
I was facing a similar problem when starting up the application (using Spring Boot) with the database server down.
Hibernate can determine the correct dialect to use automatically, but in order to do this, it needs a live connection to the database.
add spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQLDialect in application.properties file
I got this error when my database was not created. After creating the DB manually, it worked fine.
I also faced a similar issue. But, it was due to the invalid password provided. Also, I would like to say your code seems to be old-style code using spring. You already mentioned that you are using spring boot, which means most of the things will be auto configured for you. hibernate dialect will be auto selected based on the DB driver available on the classpath along with valid credentials which can be used to test the connection properly. If there is any issue with the connection you will again face the same error. only 3 properties needed in application.properties
# Replace with your connection string
spring.datasource.url=jdbc:mysql://localhost:3306/pdb1
# Replace with your credentials
spring.datasource.username=root
spring.datasource.password=
Remove the redundant Hibernate Configuration
If you're using Spring Boot, you don't need to provide the JPA and Hibernate configuration explicitly, as Spring Boot can do that for you.
Add database configuration properties
In the application.properties Spring Boot configuration file, you have the add your database configuration properties:
spring.datasource.driverClassName = org.postgresql.Driver
spring.datasource.url = jdbc:postgresql://localhost:5432/teste
spring.datasource.username = klebermo
spring.datasource.password = 123
Add Hibernate specific properties
And, in the same application.properties configuration file, you can also set custom Hibernate properties:
# Log SQL statements
spring.jpa.show-sql = false
# Hibernate ddl auto for generating the database schema
spring.jpa.hibernate.ddl-auto = create
# Hibernate database Dialect
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect
That's it!
I ran into the same problem and my issue was that the DB I was trying to connect to didn't exist.
I created the DB, verified the URL/connection string and reran and everything worked as expected.
I had same issue. adding this to the application.properties solved the issue:
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQLDialect
The following are some of the reasons for the hibernate.dialect not set issue.
Most of these exceptions are shown in the startup log which is finally followed by the mentioned issue.
Example: In Spring boot app with Postgres DB
1. Check if the database is actually installed and its server is started.
org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
java.net.ConnectException: Connection refused: connect
org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
2. Check if the database name is correctly mentioned.
org.postgresql.util.PSQLException: FATAL: database "foo" does not exist
In application.properties file,
spring.datasource.url = jdbc:postgresql://localhost:5432/foo
but foo didn't exist.
So I created the database from pgAdmin for postgres
CREATE DATABASE foo;
3. Check if the host name and server port is accessible.
org.postgresql.util.PSQLException: Connection to localhost:5431 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
java.net.ConnectException: Connection refused: connect
4. Check if the database credentials are correct.
as #Pankaj mentioned
org.postgresql.util.PSQLException: FATAL: password authentication failed for user "postgres"
spring.datasource.username= {DB USERNAME HERE}
spring.datasource.password= {DB PASSWORD HERE}
In spring boot for jpa java config you need to extend JpaBaseConfiguration and implement it's abstract methods.
#Configuration
public class JpaConfig extends JpaBaseConfiguration {
#Override
protected AbstractJpaVendorAdapter createJpaVendorAdapter() {
final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
return vendorAdapter;
}
#Override
protected Map<String, Object> getVendorProperties() {
Map<String, Object> properties = new HashMap<>();
properties.put("hibernate.dialect", "org.hibernate.dialect.PostgreSQLDialect");
}
}
this is happening because your code is not bale to connect the database. Make sure you have mysql driver and username, password correct.
Make sure your application.properties has all correct info: (I changed my db port from 8889 to 3306 it worked)
db.url: jdbc:mysql://localhost:3306/test
It turns out there is no one mentioning set spring.jpa.database=mysql in application.properties file, if you use Spring JPA. This is the simplest answer to me and I want to share in this question.
In my case the user could not connect to the database. If will have same issue if the log contains a warning just before the exception:
WARN HHH000342: Could not obtain connection to query metadata : Login failed for user 'my_user'.
Make sure you have your database in your pom like OP did. That was my problem.
My problem was that embedded database was already connected. close connection
I got this issue when Eclipse was unable to find the JDBC driver. Had to do a gradle refresh from the eclipse to get this work.
I had the same issue and after debugging it turns out that Spring application.properties had wrong IP address for DB server
spring.datasource.url=jdbc:oracle:thin:#WRONG:1521/DEV
If you are using this line:
sessionFactory.getHibernateProperties().put("hibernate.dialect", env.getProperty("hibernate.dialect"));
make sure that env.getProperty("hibernate.dialect") is not null.
Same but in a JBoss WildFly AS.
Solved with properties in my META-INF/persistence.xml
<properties>
<property name="hibernate.transaction.jta.platform"
value="org.hibernate.service.jta.platform.internal.JBossAppServerJtaPlatform" />
<property name="spring.jpa.database-platform" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="spring.jpa.show-sql" value="false" />
</properties>
For those working with AWS MySQL RDS, it may occur when you are unable to connect to the database. Go to AWS Security Groups setting for MySQL RDS and edit the inbound IP rule by refreshing MyIP.
I faced this issue and doing above got the problem fixed for me.
I also had this problem. In my case it was because of no grants were assigned to MySQL user. Assigning grants to MySQL user which my app uses resolved the issue:
grant select, insert, delete, update on my_db.* to 'my_user'#'%';
Adding spring.jpa.database-platform=org.hibernate.dialect.MariaDB53Dialect to my properties file worked for me.
PS: i'm using MariaDB
I reproduced this error message in the following three cases:
There does not exist database user with username written in application.properties file or persistence.properties file or, as in your case, in HibernateConfig file
The deployed database has that user but user is identified by different password than that in one of above files
The database has that user and the passwords match but that user does not have all privileges needed to accomplish all database tasks that your spring-boot app does
The obvious solution is to create new database user with the same username and password as in the spring-boot app or change username and password in your spring-boot app files to match an existing database user and grant sufficient privileges to that database user. In case of MySQL database this can be done as shown below:
mysql -u root -p
>CREATE USER 'theuser'#'localhost' IDENTIFIED BY 'thepassword';
>GRANT ALL ON *.* to theuser#localhost IDENTIFIED BY 'thepassword';
>FLUSH PRIVILEGES;
Obviously there are similar commands in Postgresql but I haven't tested if in case of Postgresql this error message can be reproduced in these three cases.
I had the same issue and it was caused by being unable to connect to the database instance. Look for hibernate error HHH000342 in the log above that error, it should give you an idea to where the db connection is failing (incorrect username/pass, url, etc.)
This happened to me because I hadn't added the conf.configure(); before beginning the session:
Configuration conf = new Configuration();
conf.configure();
Make sure that you have enter valid detail in application.properties and whether your database server is available. As a example when you are connecting with MySQL check whether XAMPP is running properly.
I faced the same issue: The db I was trying to connect did not exist. I used jpa.database=default (which I guess means it will try to connect to the database and then auto select the dialect). Once I started the database, it worked fine without any change.
I faced this issue due to Mysql 8.0.11 version reverting back to 5.7 solved for me
I had the same error after using the hibernate code generation
https://www.mkyong.com/hibernate/how-to-generate-code-with-hibernate-tools/
then the hibernate.cfg.xml was created in /src/main/java
but without the connection parameters
after removing it - my problem was solved