If an Exception is thrown while persisting an entity X, in the catch block can a call be made to a different method to persist some entity Y?
#Transactional(propagation = Propagation.REQUIRED)
private X addNewX(X transientX) {
X x = null;
try {
x = xDao.makePersistent(transientX); // A DB constraint will be violated and Hibernate throws PersistenceException
} catch (RuntimeException e) {
createErrorRecord(transientX, e.getMessage());
}
return x;
}
Save extra information about the error:
#Transactional(propagation = Propagation.REQUIRED)
private void createErrorRecord(X x, String errMsg) {
try {
ImportError error = new ImportError(x.getBlah(), x.moreBlah(),
errMsg);
impErrDao.makePersistent(error);
} catch (RuntimeException re) {
logger.error(re.toString());
}
}
However, ImportError never gets persisted. I tried noRollbackFor for PersistenceException but to no avail.
Is there something that can be done here?
Thanks
Using AOP for logging such exceptions seems to be the right option.
Related
i'm trying to intercept an optimistick lock exception and throw another exception but it doesn't work in my case, the exception is catched but i still have error optimistick lock in my console.
//MY DAO
public Entity getEntitieSimple(...) throws CustomException{
Entity entity="my select";
}
//MY SERVICE
#Transactional(propagation = Propagation.REQUIRED, readOnly = true)
public Entity recupererEntity() throws CustomException{
Entity entity =null;
try {
entity = dao.getEntitieSimple(...);
}catch (Exception exec){
throw new CustomException("custom message");
}
return entity;
}
#Transactional(propagation = Propagation.REQUIRED)
public void myUpdate() throws HibernateException{
try {
// entity update here
}catch (HibernateException exec){
log.error("OPTIMISTIC: "+ exec.getMessage());
throw new HibernateException("optimi update");
}
}
I'm getting this error evern after catching the exception:
ERROR - 29-09-2022 09:59:44.204 - http-nio-8090-exec-5 - 3933807 - null - c:96e7d7ca8f7d5637 - org.hibernate.internal.ExceptionMapperStandardImpl - HHH000346: Error during managed flush [Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) : [com.apicil.cosy.dop.domain.impl.Entity#1420]]
You have to catch ConcurrencyFailureException
private void updateStatus(UpdateOrderDto dto, OrdersStatusUpdaterService self) {
try {
updateStatusHelper(dto, self);
} catch (ConcurrencyFailureException ex) {
log.error("Concurrent modification error. Will try next time. orderId={}", dto.getId(), ex);
}
}
So I'm trying to retry for specific exceptions and created a bean which has shouldRetry(Throwable t) function. The function returns true if exception has to be retried, otherwise false.
But What I'm observing is shouldRetry(Throwable t) is executing twice(log is printing twice) for one retry attempt, however serviceImpl from where exception is being thrown is executing only once for one retry attempt.
Could someone please let me know if I'm doing something wrong here, or is it the default behavior/bug with spring retry itself.
#Component("dbRecoverableExceptionHandler")
#RequiredArgsConstructor(onConstructor = #__(#Autowired))
#Slf4j
public class DBRecoverableExceptionHandler {
private final Environment environment;
private final MultiTaggedCounter exceptionRetryCounter;
public Boolean isRetryable(Throwable t) {
String[] recoverableExceptionClasses = environment
.getRequiredProperty("db-recoverable-exception-classes", String[].class);
for (String s1 : recoverableExceptionClasses) {
if (t.getClass().getSimpleName().contains(s1)) {
exceptionRetryCounter.increment(1, s1);
log.warn("Retrying for exception " + t.toString());
return true;
}
}
return false;
}
}
#Retryable(exceptionExpression = "#{#dbRecoverableExceptionHandler.isRetryable(#root)}",
maxAttemptsExpression = "#{${max-attempts}}",
backoff = #Backoff(delayExpression = "#{${retry-backoff-delay-time}}",
multiplierExpression = "#{${retry-backoff-multiplier}}"))
It is as expected.
The method will be called by the RetryTemplate twice for each execution...
while (canRetry(retryPolicy, context) && !context.isExhaustedOnly()) {
try {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Retry: count=" + context.getRetryCount());
}
// Reset the last exception, so if we are successful
// the close interceptors will not think we failed...
lastException = null;
return retryCallback.doWithRetry(context);
}
catch (Throwable e) {
lastException = e;
try {
registerThrowable(retryPolicy, state, context, e);
}
catch (Exception ex) {
throw new TerminatedRetryException("Could not register throwable",
ex);
}
finally {
doOnErrorInterceptors(retryCallback, context, e);
}
if (canRetry(retryPolicy, context) && !context.isExhaustedOnly()) {
...
The first call to canRetry() (in the while loop) is skipped on the very first call since there is no exception yet, on subsequent iterations, when the method throws an exception, it is called twice.
method I am testing (the method setEventHubDataPayload throws JSONException and JsonProcessingException):
public class EventHubMapper {
//inits
public byte[] toEventDataJsonByteArray(UserRecord inbound) {
EventHubDto ehDto = new EventHubDto();
ehDto.setEventTypeVersion(inbound.getVersion());
ehDto.setEventId(inbound.getNotificationId());
JSONObject eventJson = new JSONObject(ehDto);
try {
eventJson.put("data", setEventHubDataPayload(ehDto, inbound));
} catch (JSONException e) {
analytics.trackError(AnalyticsConstants.EventHub.JSON_MAPPING_ERROR, e.toString());
} catch (JsonProcessingException e) {
analytics.trackError(AnalyticsConstants.EventHub.JSON_PROCESSING_ERROR, e.toString());
}
return eventJson.toString().getBytes();
}
}
unit test code:
#Test
public void toEventDataByteArray_JsonException() throws JSONException, JsonProcessingException {
EventHubMapper ehmMock = Mockito.spy(eventHubMapper);
doThrow(new JSONException("blah")).when(ehmMock).setEventHubDataPayload(any(), any());
eventHubMapper.toEventDataJsonByteArray(setUpMockUserRecord());
verify(analytics, times(1)).trackError( AnalyticsConstants.EventHub.JSON_MAPPING_ERROR, new JSONException("blah").toString());
}
I've tried using more specific matchers ... ex: any(EventHubDto.class) or any(UserRecord.class) and got the same result:
Wanted but not invoked:
analytics.trackError(
"EventHub_Publish_Error",
""
;
and also
Actually, there were zero interactions with this mock.
what is going on here?
I think you need to call like below while testing.
ehmMock.toEventDataJsonByteArray(setUpMockUserRecord());
I am doing a simple experiment for debugging purpose.
First I insert serveral records to database, and then I do a invalid data conversion which will throw DataIntegrityViolationException, but I will catch the exception.
I expected the records being successfully inserted into the db, since I catch the checked exception. But the whole thing is rolled back.
I do the experiment again using TransactionTemplate instead of using annotation, same result.
My questions are:
is this the expected behavior?
If anwser to No.1 is yes, then I catch the exception, how is it possible that spring knows an exception is thrown?
Here is my code:
public void insertValue() {
jdbcTemplate.execute("insert into people (person_id, name) values (4, 'asjkdhadsjkqhweqkewhkashdkahd')");
jdbcTemplate.execute("insert into people (person_id, name) values (5, 'tttqqq')");
}
// this should throw exception
public void truncateValue() {
jdbcTemplate.execute("alter table people alter column name varchar(7)");
}
public void jdbc_calls() {
insertValue();
try {
truncateValue();
} catch (Exception e) {
System.out.println(e.getMessage());
}
System.out.println("Finish");
}
public void run() {
TransactionTemplate transactionTemplate = new TransactionTemplate(transactionManager);
transactionTemplate.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
transactionTemplate.setIsolationLevel(TransactionDefinition.ISOLATION_DEFAULT);
transactionTemplate.execute(transactionStatus -> {
try {
jdbc_calls();
} catch (RuntimeException e) {
throw e;
} catch (Throwable e) {
throw new RuntimeException(e);
}
return null;
});
}
More about question No.2.
Here is the source code of TransactionTemplate.execute()
From my understanding, if I don't throw an exception, rollbackOnException won'r be triggered.
public <T> T execute(TransactionCallback<T> action) throws TransactionException {
Assert.state(this.transactionManager != null, "No PlatformTransactionManager set");
if (this.transactionManager instanceof CallbackPreferringPlatformTransactionManager) {
return ((CallbackPreferringPlatformTransactionManager) this.transactionManager).execute(this, action);
}
else {
TransactionStatus status = this.transactionManager.getTransaction(this);
T result;
try {
result = action.doInTransaction(status);
}
catch (RuntimeException | Error ex) {
// Transactional code threw application exception -> rollback
rollbackOnException(status, ex);
throw ex;
}
catch (Throwable ex) {
// Transactional code threw unexpected exception -> rollback
rollbackOnException(status, ex);
throw new UndeclaredThrowableException(ex, "TransactionCallback threw undeclared checked exception");
}
this.transactionManager.commit(status);
return result;
}
}
is this the expected behavior?
Yes, it is.
If anwser to No.1 is yes, then I catch the exception, how is it possible that spring knows an exception is thrown?
When an exception occurs, spring will mark your transaction as rollbackOnly.
So even when you catch your exception, at the end of your method, your transaction still rolled back.
In your case, I don't get why you use #Transaction since you want to commit regardless if exception occurs.
Edit
When you're using transaction with DB, the transaction invocation is delegated to EntityManager.
Look at AbstractEntityManagerImpl#handlePersistenceException:
#Override
public void handlePersistenceException(PersistenceException e) {
if ( e instanceof NoResultException ) {
return;
}
if ( e instanceof NonUniqueResultException ) {
return;
}
if ( e instanceof LockTimeoutException ) {
return;
}
if ( e instanceof QueryTimeoutException ) {
return;
}
try {
markForRollbackOnly();
}
catch ( Exception ne ) {
//we do not want the subsequent exception to swallow the original one
LOG.unableToMarkForRollbackOnPersistenceException(ne);
}
}
When exception occurs, the EntityManager mark your transaction as rollbackOnly before throws out the exception for you to catch.
After the exception is catched in your service, the AbstractPlatformTransactionManager will try to commit (because, as you know, no exception is detected there), but the EntityManager refuses to commit because its detect that the transaction marked as rollback-only.
If you read the exception, you will see something like:
javax.persistence.RollbackException: Transaction marked as rollbackOnly
I am processing three transaction inside a single method in stateless container managed bean .i want to persist three transaction while if one throws exception other two should complete their respective transaction ,error is that if first or any one is throwing exception other two are to executing please give some helpful suggestion
public void allocateSubjectToStudent(SubjectAllocatedToStudentDto dto)throws Exception {
logger.info("allocateSubjectToStudent method entry :");
List<Subject> coreList=dto.getCoreList();
Iterator<Subject> iterator=coreList.iterator();
while(iterator.hasNext()){
logger.info("inside while :");
SubjectAllocatedToStudentBo bo=new SubjectAllocatedToStudentBo();
bo.setBacthId(dto.getBacthId());
bo.setSemester(dto.getSemester());
bo.setStudentId(dto.getStudentId());
Subject subject=iterator.next();
bo.setSubjectName(subject.getSubjectName());
bo.setSubjectType(subject.getAbbreviation());
try{
manager.persist(bo);
}
catch(javax.persistence.PersistenceException e){
Throwable t = e.getCause();
while ((t != null) && !(t instanceof org.hibernate.exception.ConstraintViolationException)) {
t = t.getCause();
}//while
if (t instanceof org.hibernate.exception.ConstraintViolationException) {
throw new Exception("Core subject already allocated to student");
} //end of if
}//end of catch
}//end of while
List<Subject> departmentallist=dto.getDepartmentList();
Iterator<Subject> iterator1=departmentallist.iterator();
while(iterator1.hasNext()){
logger.info("inside while :");
SubjectAllocatedToStudentBo bo=new SubjectAllocatedToStudentBo();
bo.setBacthId(dto.getBacthId());
bo.setSemester(dto.getSemester());
bo.setStudentId(dto.getStudentId());
Subject subject=iterator1.next();
bo.setSubjectName(subject.getSubjectName());
bo.setSubjectType(subject.getAbbreviation());
try{
manager.persist(bo);
}
catch(javax.persistence.PersistenceException e){
Throwable t = e.getCause();
while ((t != null) && !(t instanceof org.hibernate.exception.ConstraintViolationException)) {
t = t.getCause();
}//while
if (t instanceof org.hibernate.exception.ConstraintViolationException) {
throw new Exception("InterDepartmental subject already allocated to student");
} //end of if
}//end of catch
}//end of while
List<Subject> electiveList=dto.getElectiveList();
Iterator<Subject> iterator2=electiveList.iterator();
while(iterator2.hasNext()){
logger.info("inside while :");
SubjectAllocatedToStudentBo bo=new SubjectAllocatedToStudentBo();
bo.setBacthId(dto.getBacthId());
bo.setSemester(dto.getSemester());
bo.setStudentId(dto.getStudentId());
Subject subject=iterator2.next();
bo.setSubjectName(subject.getSubjectName());
bo.setSubjectType(subject.getAbbreviation());
try{
manager.persist(bo);
}
catch(javax.persistence.PersistenceException e){
Throwable t = e.getCause();
while ((t != null) && !(t instanceof org.hibernate.exception.ConstraintViolationException)) {
t = t.getCause();
}//while
if (t instanceof org.hibernate.exception.ConstraintViolationException) {
throw new Exception("Elective subject already allocated to student");
} //end of if
}//end of catch
}//end of while
logger.info("allocateSubjectToStudent method exit :");
} //end of method
create three different method all with TranscationAttributeType REQUIRES_NEW
Please find below code snippet for EJB3 Bean
public void doYourWork()
{
a();
b();
c();
}
#TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public void a()
{
try
{
//Do the first transaction here
}catch(Exception e)
{
}
}
#TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public void b()
{
try
{
//Do the second transaction here
}catch(Exception e)
{
}
}
#TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public void c()
{
try
{
//Do the third transaction here
}catch(Exception e)
{
}
}
Within a single method invocation there is only a single transaction active. To achieve what you want, you must perform the three operations in different transactions. This would require one more level of abstracttion.
public class MyFreshTransaction {
#TransactionAttribute(REQUIRES_NEW)
public void updateO() {
//do something
}
#TransactionAttribute(REQUIRES_NEW)
public void update1() {
//do something
}
#TransactionAttribute(REQUIRES_NEW)
public void update2() {
//do something
}
}
#Stateless
public class MyTransactionProcessor {
#EJB
private MyFreshTransaction freshTransaction;
public void processTransaction() {
try {
//The current transaction context will be suspended, and a new one invoked
//if the new one fails and is rollback, the current one is not affected.
//you can then handle the exception, by rethrowing the exception,in which case
//the current transaction will also be rolled back, or continue based on your logic.
freshTransaction.update0();
} catch (Exception ex ) {//handle}
try {
//The current transaction context will be suspended, and a new one invoked
//if the new one fails and is rollback, the current one is not affected.
//you can then handle the exception, by rethrowing the exception,in which case
//the current transaction will also be rolled back, or continue based on your logic.
freshTransaction.update1();
} catch (Exception ex ) {//handle}
try {
//The current transaction context will be suspended, and a new one invoked
//if the new one fails and is rollback, the current one is not affected.
//you can then handle the exception, by rethrowing the exception,in which case
//the current transaction will also be rolled back, or continue based on your logic.
freshTransaction.update2();
} catch (Exception ex ) {//handle}
}
}
Note that if any of the update transaction was successful, and the the parent transaction is rolled back, it will not affect the status of the 'child' transactions, as they had already been committed and their effects (if DB effects) will be committed too.
Read on Java EE Transactions Java EE Transactions