Fix error propagation from job executions

Before this commit, Spring Batch was catching all Throwable types
so they can be available after the job execution through
jobExecution.getAllFailureExceptions(). However, this prevents
the JVM to crash on any Error like it should (for example like OOM
errors [1]), effectively preventing the possibility to generate
heap dumps to analyze these kinds of errors.

This commit updates the code to catch only exceptions and let
errors bubble up to let the JVM handle them as needed.

Resolves #808

[1]: https://stackoverflow.com/questions/54811702/spring-batch-doesnt-propagate-errors

Author: fmbenhassine

spring-batch-core/src/main/java/org/springframework/batch/core/job/AbstractJob.java

@@ -44,8 +44,6 @@
 import org.springframework.batch.core.repository.JobRepository;
 import org.springframework.batch.core.launch.JobRestartException;
 import org.springframework.batch.core.scope.context.JobSynchronizationManager;
-import org.springframework.batch.core.step.StepLocator;
-import org.springframework.batch.infrastructure.repeat.RepeatException;
 import org.springframework.beans.factory.BeanNameAware;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.util.Assert;
@@ -292,15 +290,11 @@ public final void execute(JobExecution execution) throws JobInterruptedException
 
 				listener.beforeJob(execution);
 
-				try {
-					doExecute(execution);
-					if (logger.isDebugEnabled()) {
-						logger.debug("Job execution complete: " + execution);
-					}
-				}
-				catch (RepeatException e) {
-					throw e.getCause();
+				doExecute(execution);
+				if (logger.isDebugEnabled()) {
+					logger.debug("Job execution complete: " + execution);
 				}
+
 			}
 			else {
 
@@ -326,7 +320,7 @@ public final void execute(JobExecution execution) throws JobInterruptedException
 			execution.setStatus(BatchStatus.max(BatchStatus.STOPPED, e.getStatus()));
 			execution.addFailureException(e);
 		}
-		catch (Throwable t) {
+		catch (Exception t) {
 			logger.error("Encountered fatal error executing job", t);
 			execution.setExitStatus(getDefaultExitStatusForFailure(t));
 			execution.setStatus(BatchStatus.FAILED);