Program: 39642
Project: 39642
Buggy source:
@Override protected TUExecutionResult execution(File transformedAppFolder,TransformationContext transformationContext){
  File pomFile=getAbsoluteFile(transformedAppFolder,transformationContext);
  TUExecutionResult result=null;
  try {
    for (    MavenInvocationOutputHandler outputHandler : outputHandlers) {
      multipleOutputHandler.register(outputHandler);
    }
    request.setPomFile(pomFile);
    request.setGoals(Arrays.asList(goals));
    request.setOutputHandler(multipleOutputHandler);
    if (mavenFailureBehavior != null) {
      request.setFailureBehavior(mavenFailureBehavior);
    }
    if (null != properties && false == properties.isEmpty()) {
      request.setProperties(properties);
    }
    invocationResult=invoker.execute(request);
    int exitCode=invocationResult.getExitCode();
    Map<Class<? extends MavenInvocationOutputHandler>,Object> outputHandlersResult=multipleOutputHandler.getResult();
    if (exitCode == 0) {
      result=TUExecutionResult.value(this,outputHandlersResult);
    }
 else {
      Exception e=invocationResult.getExecutionException();
      if (e == null) {
        e=new TransformationUtilityException(String.format("String_Node_Str",Arrays.toString(goals),exitCode));
      }
      if (warnOnError) {
        result=TUExecutionResult.warning(this,e,outputHandlersResult);
      }
 else {
        result=TUExecutionResult.error(this,e,outputHandlersResult);
      }
    }
  }
 catch (  Exception e) {
    if (invocationResult != null) {
      Exception invocationException=invocationResult.getExecutionException();
      if (invocationException != null) {
        if (warnOnError) {
          result=TUExecutionResult.warning(this,e,null);
        }
 else {
          result=TUExecutionResult.error(this,invocationException);
        }
      }
    }
    if (result == null) {
      if (warnOnError) {
        result=TUExecutionResult.warning(this,e,null);
      }
 else {
        result=TUExecutionResult.error(this,e);
      }
    }
  }
  return result;
}

Fixed version (ground truth):
@Override protected TUExecutionResult execution(File transformedAppFolder,TransformationContext transformationContext){
  File pomFile=getAbsoluteFile(transformedAppFolder,transformationContext);
  TUExecutionResult result=null;
  try {
    for (    MavenInvocationOutputHandler outputHandler : outputHandlers) {
      multipleOutputHandler.register(outputHandler);
    }
    request.setPomFile(pomFile);
    request.setGoals(Arrays.asList(goals));
    request.setOutputHandler(multipleOutputHandler);
    if (mavenFailureBehavior != null) {
      request.setFailureBehavior(mavenFailureBehavior);
    }
    if (null != properties && false == properties.isEmpty()) {
      request.setProperties(properties);
    }
    invocationResult=invoker.execute(request);
    int exitCode=invocationResult.getExitCode();
    Map<Class<? extends MavenInvocationOutputHandler>,Object> outputHandlersResult=multipleOutputHandler.getResult();
    if (exitCode == 0) {
      result=TUExecutionResult.value(this,outputHandlersResult);
    }
 else {
      Exception e=invocationResult.getExecutionException();
      if (e == null) {
        e=new TransformationUtilityException(String.format("String_Node_Str",Arrays.toString(goals),exitCode));
      }
      if (warnOnError) {
        result=TUExecutionResult.warning(this,e,outputHandlersResult);
      }
 else {
        result=TUExecutionResult.error(this,e,outputHandlersResult);
      }
    }
  }
 catch (  Exception e) {
    if (invocationResult != null) {
      Exception invocationException=invocationResult.getExecutionException();
      if (invocationException != null) {
        result=TUExecutionResult.error(this,invocationException);
      }
    }
    if (result == null) {
      result=TUExecutionResult.error(this,e);
    }
  }
  return result;
}