@Override
public synchronized <T> T execute(Command<T> command) {
boolean transactionOwner = false;
T result = null;
try {
transactionOwner = txm.begin();
tpm.beginCommandScopedEntityManager();
TransactionManagerHelper.registerTransactionSyncInContainer(
this.txm, new TaskSynchronizationImpl(this));
result = executeNext((Command<T>) command);
postInit(result);
txm.commit(transactionOwner);
return result;
} catch (TaskException e) {
// allow to handle TaskException as business exceptions on caller side
// if transaction is owned by other component like process engine
if (transactionOwner) {
rollbackTransaction(e, transactionOwner);
e.setRecoverable(false);
throw e;
} else {
throw e;
}
} catch (RuntimeException re) {
rollbackTransaction(re, transactionOwner);
throw re;
} catch (Exception t1) {
rollbackTransaction(t1, transactionOwner);
throw new RuntimeException("Wrapped exception see cause", t1);
}
}
private void rollbackTransaction(Exception t1, boolean transactionOwner) {
try {
logger.warn("Could not commit session", t1);
txm.rollback(transactionOwner);
} catch (Exception t2) {
logger.error("Could not rollback", t2);
throw new RuntimeException("Could not commit session or rollback", t2);
}
}