Autowried in hibernate constraintvalidator returns nullexception - spring-boot

Question

After looking around, I couldn't find any good solution to this.
My autowired didn't work as expected where it returns null. I've autowired this particular class in other classes and it works so it only doesn't work in constraintvalidator classes.
Error
java.lang.IllegalStateException: Failed to execute CommandLineRunner
at
org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:798)
~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE] at
org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:779)
~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE] at
org.springframework.boot.SpringApplication.run(SpringApplication.java:322)
~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE] at
org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE] at
org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE] at
com.Alex.Mains.JpaApplication.main(JpaApplication.java:21)
~[classes/:na] Caused by:
org.springframework.transaction.TransactionSystemException: Could not
commit JPA transaction; nested exception is
javax.persistence.RollbackException: Error while committing the
transaction at
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:543)
~[spring-orm-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:743)
~[spring-tx-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:711)
~[spring-tx-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:632)
~[spring-tx-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:386)
~[spring-tx-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118)
~[spring-tx-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
~[spring-aop-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
~[spring-tx-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
~[spring-aop-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:178)
~[spring-data-jpa-2.3.1.RELEASE.jar:2.3.1.RELEASE] at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
~[spring-aop-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
~[spring-aop-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
~[spring-aop-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
~[spring-aop-5.2.7.RELEASE.jar:5.2.7.RELEASE] at
com.sun.proxy.$Proxy93.save(Unknown Source) ~[na:na] at
com.Alex.Mains.UserRepositoryCommandLineRunner.run(UserRepositoryCommandLineRunner.java:26)
~[classes/:na] at
org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:795)
~[spring-boot-2.3.1.RELEASE.jar:2.3.1.RELEASE] ... 5 common frames
omitted Caused by: javax.persistence.RollbackException: Error while
committing the transaction at
org.hibernate.internal.ExceptionConverterImpl.convertCommitException(ExceptionConverterImpl.java:81)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:534)
~[spring-orm-5.2.7.RELEASE.jar:5.2.7.RELEASE] ... 21 common frames
omitted Caused by: javax.validation.ValidationException: HV000028:
Unexpected exception during isValid call. at
org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateSingleConstraint(ConstraintTree.java:186)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.engine.constraintvalidation.SimpleConstraintTree.validateConstraints(SimpleConstraintTree.java:62)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:75)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.metadata.core.MetaConstraint.doValidateConstraint(MetaConstraint.java:130)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:123)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:555)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:518)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:488)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:450)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:400)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:172)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final] at
org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:116)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:80)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.action.internal.EntityInsertAction.preInsert(EntityInsertAction.java:227)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:100)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.engine.spi.ActionQueue.lambda$executeActions$1(ActionQueue.java:478)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:723)
~[na:na] at
org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:475)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:348)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:40)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:102)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1360)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:451)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3210)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2378)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:447)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:183)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:40)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:281)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] at
org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:101)
~[hibernate-core-5.4.17.Final.jar:5.4.17.Final] ... 22 common frames
omitted Caused by: java.lang.NullPointerException: null at
com.Alex.Validations.EmailValidator.isValid(EmailValidator.java:26)
~[classes/:na] at
com.Alex.Validations.EmailValidator.isValid(EmailValidator.java:1)
~[classes/:na] at
org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateSingleConstraint(ConstraintTree.java:180)
~[hibernate-validator-6.1.5.Final.jar:6.1.5.Final]
UserService class
#Service
public class UserService {
#Autowired
private UserRepository userRep;
public void addUser(User user) {
userRep.save(user);
}
public void deleteUser(long userId) {
userRep.deleteById(userId);
}
public List<User> retrieveAllUsers(){
Iterable<User>temp =userRep.findAll();
List<User>allUsers = null;
temp.forEach(allUsers::add);
return allUsers;
}
public boolean searchByEmail(String email) {
return userRep.findByEmail(email);
}
public void updateUser(User user) {
userRep.save(user);
}
}
Annotation interface class
#Target(ElementType.FIELD)
//When will the annotation be processed compilation, runtime etc
#Retention(RetentionPolicy.RUNTIME)
//Where is the logic
#Constraint(validatedBy = EmailValidator.class)
#Documented
public #interface ValidEmail {
//Error message
String message() default "Invalid email";
//Required for annotation
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
Annotation logic class
public class EmailValidator implements ConstraintValidator<ValidEmail, String> {
#Autowired
private UserService service;
//Actual place to place the logic to check if the data is valid or not
#Override
public boolean isValid(String email, ConstraintValidatorContext context) {
if (email == null) {
return false;
}
List<User> users = service.retrieveAllUsers();
if (users.size() > 0) {
return Pattern.matches("(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")#(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9]))\\.){3}(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9])|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])", email)
&& service.searchByEmail(email);
}
else {
return Pattern.matches("(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")#(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9]))\\.){3}(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9])|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])", email);
}
}
#Override
public void initialize(ValidEmail validEmail) {
validEmail.message();
}
}
Main
#SpringBootApplication
#ComponentScan(basePackages = {
"com.Alex.Mains", "com.Alex.UserPackage", "com.Alex.Flights", "com.Alex.Security"
})
#EntityScan( basePackages = {"com.Alex.UserPackage", "com.Alex.Flights"})
#EnableJpaRepositories({"com.Alex.UserPackage", "com.Alex.Flights"})
public class JpaApplication {
public static void main(String[] args) {
SpringApplication.run(JpaApplication.class, args);
}
// #Bean
// public Validator validator(final AutowireCapableBeanFactory beanFactory) {
//
// ValidatorFactory validatorFactory = Validation.byProvider(HibernateValidator.class)
// .configure()
// .constraintValidatorFactory(new SpringConstraintValidatorFactory(beanFactory))
// .buildValidatorFactory();
//
// return validatorFactory.getValidator();
// }
}

Answer 1

Hibernate is calling the validation and it does not know anything about Spring by default so that #Autowired stereotype is not going to be honoured.
If you want to use Spring there, you need to configure Hibernate to be able to resolve the dependency injection properly.
I can't know for sure as you haven't shared a sample we can run but try to add the following configuration:
#Configuration
class HibernateCustomization {
#Bean
public HibernatePropertiesCustomizer hibernatePropertiesCustomizer(ValidatorFactory validatorFactory) {
return (properties) -> {
properties.put(org.hibernate.cfg.AvailableSettings.JPA_VALIDATION_FACTORY, validatorFactory);
};
}
}