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How to set default values of model class variables from yaml file?

In a service file I would simply use #Value and initialize the variable instially there. I have tried this approach in a model class but (I assume how things get autowired and that its a model class) this results in it always being null.
The need for this comes out that in different environments the default value is always different.
#Value("${type}")
private String type;

I would avoid trying to use Spring logic inside the models as they are not Spring beans themselves. Maybe use some form of a creational (pattern) bean in which the models are constructed, for example:
#Component
public class ModelFactory {
#Value("${some.value}")
private String someValue;
public SomeModel createNewInstance(Class<SomeModel> clazz) {
return new SomeModel(someValue);
}
}
public class SomeModel {
private String someValue;
public SomeModel(String someValue) {
this.someValue = someValue;
}
public String getSomeValue() {
return someValue;
}
}
#ExtendWith({SpringExtension.class})
#TestPropertySource(properties = "some.value=" + ModelFactoryTest.TEST_VALUE)
#Import(ModelFactory.class)
class ModelFactoryTest {
protected static final String TEST_VALUE = "testValue";
#Autowired
private ModelFactory modelFactory;
#Test
public void test() {
SomeModel someModel = modelFactory.createNewInstance(SomeModel.class);
Assertions.assertEquals(TEST_VALUE, someModel.getSomeValue());
}
}

JPARepository is not saving to DB

Long story, but I had to redesign an application this weekend. From a spring boot app to a spring batch app. The process was always a batch process, but I tried to make this batch engine and it got way too complex and i had to stop what I was doing. I'm sure we've all been there. Anyway everything is working fine!! Except for one piece of code that I tried to keep the original piece of code for. I'm trying to use a JPARepository save method and it's not working!! I am able to call the save method, I feel like the Repo is instantiated because I'm not getting a null pointer exception. In fact, I'm not getting any exceptions thrown. I am just not seeing anything in the DB. And I know this code has worked because I had it running in the previous design. Anyway here are my classes...
Data object:
#Data
#Entity
#Table(name="PAYEE_QUAL_LS")
public class PayeeList {
#EmbeddedId
private PayeeListPK payeeListPK = new PayeeListPK();
#Column(name = "PAYEE_QUAL_CD")
private String payeeQualCode;
#Column(name = "ETL_TS")
private Timestamp etlTimestamp;
}
Primary key data class...
#Data
#Embeddable
public class PayeeListPK implements Serializable {
#Column(name = "PAYEE_NM")
private String payeeName;
#Column(name = "BAT_PROC_DT")
private Date batchProcDate;
}
Repo class...
#Repository
public interface PayeeListRepo extends JpaRepository<PayeeList,String> {}
My Service class...
public class OracleService {
private static final Logger logger = LoggerFactory.getLogger(OracleService.class);
#Autowired
PayeeListRepo payeeListRepo;
public void loadToPayeeListTable(PayeeList payeeList) {
payeeListRepo.save(payeeList);
}
I have an implementation of Tasklet which I am calling from my batch Step...
public class PayeeListTableLoad implements Tasklet {
private static final Logger logger = LoggerFactory.getLogger(PayeeListTableLoad.class);
private java.sql.Date procDt;
private String inputFile;
private Timestamp time;
private int safeRecordCount = 0;
private int blockRecordCount = 0;
private int safeRejectRecordCount = 0;
private int blockRejectRecordCount = 0;
private ArrayList<String> rejectRecordList = new ArrayList<>();
#Autowired
OracleService oracleService;
#Override
public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
java.util.Date parsed = format.parse(System.getenv("procDt"));
procDt = new java.sql.Date(parsed.getTime());
inputFile = Constants.filePath;
time = new Timestamp(System.currentTimeMillis());
logger.info("Running data quality checks on input file and loading to Oracle");
try (BufferedReader reader = new BufferedReader(new FileReader(inputFile))) {
String line = reader.readLine();
while (line != null) {
if (dataQuality(line)) {
PayeeList payeeList = buildPayeeListObject(line);
oracleService.loadToPayeeListTable(payeeList);
logger.info("Record loaded: " + line);
} else {
rejectRecordList.add(line);
try {
if (line.split("\\|")[1].equals("B")) {
blockRejectRecordCount++;
} else if (line.split("\\|")[1].equals("S")) {
safeRejectRecordCount++;
}
logger.info("Record rejected: " + line);
} catch (ArrayIndexOutOfBoundsException e) {
e.printStackTrace();
}
}
line = reader.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
logger.info("Safe record count is: " + safeRecordCount);
logger.info("Block record count is: " + blockRecordCount);
logger.info("Rejected records are: " + rejectRecordList);
SendEmail sendEmail = new SendEmail();
sendEmail.sendEmail(Constants.aegisCheckInclearingRecipient,Constants.aegisCheckInclearingSender,Constants.payeeListFileSuccessEmailSubject,Constants.payeeListFileSuccessEmailBodyBuilder(safeRecordCount,blockRecordCount,safeRejectRecordCount,blockRejectRecordCount,rejectRecordList));
logger.info("Successfully loaded to Oracle and sent out Email to stakeholders");
return null;
}
In my batch configuration....
#Bean
public OracleService oracleService() { return new OracleService(); }
#Bean
public PayeeListTableLoad payeeListTableLoad() {
return new PayeeListTableLoad();
}
#Bean
public Step payeeListLoadStep() {
return stepBuilderFactory.get("payeeListLoadStep")
.tasklet(payeeListTableLoad())
.build();
}
#Bean
public Job loadPositivePayFile(NotificationListener listener, Step positivePayLoadStep) {
return jobBuilderFactory.get("loadPositivePayFile")
.incrementer(new RunIdIncrementer())
.listener(listener)
.start(positivePayDataQualityStep())
.next(initialCleanUpStep())
.next(positivePayLoadStep)
.next(metadataTableLoadStep())
.next(cleanUpGOSStep())
.build();
}
Ultimately our step is running an implementation of Tasklet, we are Autowiring out OracleService class, and then that is being called and is then calling the Repo method. I am getting to the Oracle Service class method and I am calling the save method of my Autowired Repository but again nothing is happening!!
EDIT!!!
I have figured out another way to do it and that is with EntityManager and using the persist and flush methods. Below is now my loadToPayeeListTable method in my Oracle Service class...
public void loadToPayeeListTable(PayeeList payeeList) throws ParseException {
EntityManager entityManager = entityManagerFactory.createEntityManager();
EntityTransaction transaction = entityManager.getTransaction();
transaction.begin();
entityManager.persist(payeeList);
entityManager.flush();
transaction.commit();
entityManager.close();
}

Could you have a try to passe the repository with a Spring Test? I have never met this problem, but I am not sure about the DB type. Is it Mysql, Oracle? Because I never used it with #EmbeddedId.
IF you passed the unit test, you ought to check your service logic with debugging. Opposite, you ought to passe the test first.

Change your jpa repository to
#Repository
public interface PayeeListRepo extends JpaRepository<PayeeList, PayeeListPK>

Json Deserialization and save to JPA on boot

Good morning,
I consume API in JSON format, data on the latest exchange rates.
I want this data to be downloaded to me at the beginning of the application and saved in the database. I use spring JPA.
The problem is I do not know how I should write it down.
I have a class responsible for the connection which returns the output in the form of a String.
Another creates de-serialization.
I also have two classes of model that I can use to download data.
I do not want to create a separate class in which the program will pull out each value individually. I was thinking about the map but I do not know how to do it.
Some code:
Model 1
#Data
#AllArgsConstructor
#Entity
public class CurrencyData {
#Id
#GeneratedValue( strategy = GenerationType.AUTO )
private Long id;
#SerializedName("rates")
#Expose
#Embedded
private Rates rates;
#SerializedName("base")
#Expose
#Embedded
private String base;
#SerializedName("date")
#Expose
#Embedded
private String date;
}
Model 2
#Data
#AllArgsConstructor
#Embeddable
public class Rates {
protected Rates(){}
#SerializedName("CAD")
#Expose
private Double cAD;
#SerializedName("HKD")
}
ConnectService with string api output
private static final String REQUEST_CURRENCY = "https://api.exchangeratesapi.io/latest?base=USD";
public String connect() {
String output = null;
try {
System.out.println("URL String : " + REQUEST_CURRENCY);
URL url = new URL(REQUEST_CURRENCY);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");
if (conn.getResponseCode() != 200) {
throw new TODO("TODO : ", e.getMessage());
} else {
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
output = response.toString();
}
} catch (Exception e) {
throw new OutputFromApiException("ConnectService CurrencyData-API: output is : ", e.getMessage());
}
return output;
}
GsonConvert- Deserialization
public CurrencyData gsonCurrency(String answer) {
Gson g = new Gson();
CurrencyData currencyData = null;
try {
currencyData = g.fromJson(answer, CurrencyData.class);
} catch (Exception e) {
throw new OutputFromApiException("HistoricalFlight API output is empty ", e.toString());
}
return currencyData;
}
Repository
#Repository
public interface CurrencyRepository extends JpaRepository<CurrencyData, Long> {
}
... And probably I have to write something here..
#Bean
CommandLineRunner runner(CurrencyRepository currencyRepository) {
return args -> {
currencyRepository.save();
};
}

If you are using Spring Boot I think you should define a main class that implements CommandLineRunner instead of defining it as a #Bean. It should be something like:
#SpringBootApplication
public class SpringBootConsoleApplication implements CommandLineRunner {
public static void main(String[] args) {
SpringApplication.run(SpringBootConsoleApplication.class, args);
}
#Autowired
CurrencyRepository currencyRepository;
#Autowired
ConnectService connectionService;
#Override
public void run(String... args) {
String output = connectionService.connect();
CurrencyData currencyData = connectionService.gsonCurrency(output);
currencyRepository.save(currencyData);
}
}
Also I assumed that your jpa configuration is correct and your CurrencyRepository works as expected. If you do not have a manually created database structure than you may consider adding to application.properties file as:
spring.jpa.hibernate.ddl-auto=update
This will provide you that JPA creates or updates the proper database structures on every boot by using your entities configuration.
EDIT:
Sorry I forgot to mention about that you should pass the entity which you want to persist into database. I edited the code as I guess gsonCurrency method is a method inside ConnectionService. Also you can pass a parameter to connectionService.connect() method for base if you want to fetch different data according to different base currencies like this:
CurrencyData currencyDataUSD = connectionService.gsonCurrency(connectionService.connect("USD"));
CurrencyData currencyDataEUR = connectionService.gsonCurrency(connectionService.connect("EUR"));
// and go on if you like

You can use Spring Boot and Rest Template so that you can easily manage the message conversion without having to write the low level HttpConnection. There are two ways to execute a method when an application startup happens in Spring Boot, CommandLineRunner and ApplicationRunner, and here we are using the first as shown below :
#SpringBootApplication
public class Application {
private static final Logger log = LoggerFactory.getLogger(Application.class);
public static void main(String args[]) {
SpringApplication.run(Application.class);
}
#Bean
public RestTemplate restTemplate(RestTemplateBuilder builder) {
return builder.build();
}
#Bean
public CommandLineRunner run(RestTemplate restTemplate) throws Exception {
return args -> {
Quote quote = restTemplate.getForObject(
"https://gturnquist-quoters.cfapps.io/api/random", Quote.class);
log.info(quote.toString());
};
}
}
Source: https://spring.io/guides/gs/consuming-rest/

Adding soap header for each service request

First I will explain the project. It is an integration Web Service, that listens for requests and internally consumes another web Service and handles its reponses in order to get the desired answer. I need to add a custom header to each request to the "internal" Web Service. I have checked that using the next configuration, the handler is a singleton class. I need that every new request to the "internal Service" creates a new instance. I have checked that sometimes the headers for request "A" are using the values for request "B". I am initializing the values of the header before the first "internal" request (I need to make a call to a method of the "internal" web service without any soap header, and then set it up using a value contained in the first response). Any ideas how can I make this work?
Thanks
//ConfigurationClass
#Bean(name = "internalService")
#Scope(scopeName="prototype")
public JaxWsPortProxyFactoryBean internalService() {
JaxWsPortProxyFactoryBean bean = new JaxWsPortProxyFactoryBean();
try {
bean.setServiceInterface(internalService.class);
bean.setWsdlDocumentUrl(new URL("https://localhost/internalService.svc?wsdl" ));
bean.setNamespaceUri( "http://schemas.internalService.com/2019/04/");
bean.setServiceName("InternalService");
bean.setPortName("InternalServicePort");
bean.setEndpointAddress("https://localhost/internalService.svc");
bean.setHandlerResolver(wsHandlerResolver());
} catch (MalformedURLException e) {
e.printStackTrace();
}
return bean;
}
#Bean(name = "wsHandlerResolver")
public WebServiceHandlerResolver wsHandlerResolver() {
WebServiceHandlerResolver wshandlerResolver = new WebServiceHandlerResolver();
List handlers = new ArrayList();
handlers.add(webServiceHandler());
wshandlerResolver.setHandlers(handlers);
return wshandlerResolver;
}
#Bean(name = "webServiceHandler")
public WebServiceHandler webServiceHandler() {
WebServiceHandler webServiceHandler = new WebServiceHandler();
return webServiceHandler;
}
//HandlerResolver class
public class WebServiceHandlerResolver implements HandlerResolver {
private List<Handler> handlers;
public List<Handler> getHandlerChain(PortInfo portInfo) {
return handlers;
}
public void setHandlers(List<Handler> handlers) {
this.handlers = handlers;
}
}
//Handler class
public class WebServiceHandler implements SOAPHandler<SOAPMessageContext> {
private String user;
private String pass;
private String source;
#Override
public boolean handleMessage(SOAPMessageContext context) {
//THIS IS WHERE I ADD THE VALUES
}
}

Use java.lang.ThreadLocal<YourPropertiesHolder> variable inside your WebServiceHandler to store and access properties. Then properties from different requests of your service will not conflict.
class YourPropertiesHolder {
String user;
String pass;
String source;
}

Finally I was able to do it. It was just a problem with the scope request in the Handler class, I was missing the proxyMode option.
#Scope(value = WebApplicationContext.SCOPE_REQUEST, proxyMode = ScopedProxyMode.TARGET_CLASS)

Error injecting constructor in play java mongodb

I'm trying to inject my dao object in controller. I've done this:
I've a:
1. MongoDBHelper
2. MerchantDAO
3. MerchantService
4. MerchantController
This is MongoDBHelper class:
import javax.inject.Singleton;
#Singleton
public class MongoDBHelper {
private DB db;
private Datastore datastore;
private Configuration config = Play.application().configuration();
private final String SERVER_URL = config.getString("server_url");
private final String USERNAME = config.getString("database.userName");
private final String PASSWORD = config.getString("database.password");
private final String DATABASE_NAME = config.getString("database.name");
public MongoDBHelper() {
try {
MongoClient mongoClient = new MongoClient();
this.db = mongoClient.getDB(DATABASE_NAME);
this.db.authenticate(USERNAME, PASSWORD.toCharArray());
Morphia morphia = new Morphia();
this.datastore = morphia.createDatastore(mongoClient, DATABASE_NAME);
morphia.mapPackage("models");
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
public DB getDB() {
return this.db;
}
public Datastore getDatastore() {
return this.datastore;
}
}
This is MerchantDAO class
public class MerchantDAO {
#Inject MongoDBHelper mongoDBHelper;
private Datastore datastore = mongoDBHelper.getDatastore();
private DB db = mongoDBHelper.getDB();
private static final String AUTH_TOKEN = "authToken";
private static final Config config = ConfigFactory.load(Play.application().configuration().getString("property.file.name"));
public void updateMerchantWithAuthToken(Merchant merchant){
Query<Merchant> query = datastore.createQuery(Merchant.class).field(config.getString("string.email")).equal(merchant.getEmail());
UpdateOperations<Merchant> ops = datastore.createUpdateOperations(Merchant.class).set(AUTH_TOKEN, merchant.getAuthToken()).set("lastRequestTime",merchant.getLastRequestTime());
UpdateResults res = datastore.update(query, ops);
}
}
}
This is MerchantService class:
public class MerchantService {
static final Config config = ConfigFactory.load(Play.application().configuration().getString("property.file.name"));
#Inject
MerchantDAO merchantDAO;
// Creating unique authToken for already logged in merchant
public String createToken(Merchant merchant) {
merchantDAO.updateMerchantWithAuthToken(merchant);
return authToken;
}
}
This is MerchantController
import javax.inject.Inject;
public class MerchantController extends Controller {
#Inject MerchantService merchantService;
public final static String AUTH_TOKEN_HEADER = "X-AUTH-TOKEN";
public static final String AUTH_TOKEN = "authToken";
public static final Config config = ConfigFactory.load(Play.application().configuration().getString("property.file.name"));
public static Merchant getMerchant() {
return (Merchant)Http.Context.current().args.get("merchant");
}
public Result login() throws Exception {
// code to perform login
return ok(); // status success / failure
}
}
I'm getting following error:
ProvisionException: Unable to provision, see the following errors:
1) Error injecting constructor, java.lang.NullPointerException
at daos.MerchantDAO.<init>(MerchantDAO.java:22)
while locating daos.MerchantDAO
for field at services.MerchantService.merchantDAO(MerchantService.java:26)
while locating services.MerchantService
for field at controllers.MerchantController.merchantService(MerchantController.java:21)
while locating controllers.MerchantController
for parameter 2 at router.Routes.<init>(Routes.scala:36)
while locating router.Routes
while locating play.api.inject.RoutesProvider
while locating play.api.routing.Router
1 error
What am I possibly doing wrong? Why is DI not working properly?
Thanks in advance.

I think the problem is with these lines:
private Datastore datastore = mongoDBHelper.getDatastore();
private DB db = mongoDBHelper.getDB();
These are evaluated during the object instance's construction. I believe that injection won't occur until AFTER the object instance has completed construction. Therefore, mongoDBHelper is null while the above assignments are made.
One way to solve this would be to set datastore and db in the method updateMerchantWithAuthToken.

The problem is that you are trying to access the Configuration object during the MongoDBHelper instantiation. You should just inject the play Configuration object to your module's constructor and initialize all properties within the constructor:
#Inject
public MongoDBHelper(Configuration configuration) {
config = Play.application().configuration();
<read the rest of the config values here>
See the note in the configurable bindings section of the D.I. documentation here