Program: 81753
Project: 81753
Buggy source:
@Override public final void process(final Exchange exchange) throws Exception {
  final long begin=System.currentTimeMillis();
  final Message in=exchange.getIn();
  final String format=in.getHeader(Constants.FORMAT_ATTRIBUTE_NAME,String.class);
  final Integer jobId=in.getHeader(Constants.JOB_ID_ATTRIBUTE_NAME,Integer.class);
  final JobInstance configuration=cache.getJobInstance(jobId);
  if (configuration == null) {
    log.error(MessageCatalog._00038_UNKNOWN_JOB_ID,jobId);
    throw new IllegalArgumentException(String.valueOf(jobId));
  }
  if (in.getBody() instanceof NullObject) {
    incrementJobStatsAndElapsed(jobId,null,0);
    return;
  }
  VelocityContext velocityContext=null;
  String triples=null;
  long elapsed=0;
  try {
    final Template template=velocityEngine.getTemplate(templateName(format));
    if (template == null) {
      log.error(MessageCatalog._00040_TEMPLATE_NOT_FOUND,format);
      return;
    }
    velocityContext=contexts.get();
    velocityContext.put(Constants.JOB_CONFIGURATION_ATTRIBUTE_NAME,configuration);
    populateVelocityContext(velocityContext,in,configuration);
    final Writer sw=new StringWriter();
    final Writer w=new BufferedWriter(sw);
    template.merge(velocityContext,w);
    w.flush();
    elapsed=System.currentTimeMillis() - begin;
    triples=sw.toString();
    in.setBody(triples);
    in.setHeader(Constants.GRAPH_ATTRIBUTE_NAME,graphName(configuration));
  }
 catch (  final ResourceNotFoundException exception) {
    log.error(MessageCatalog._00040_TEMPLATE_NOT_FOUND,exception,format);
  }
 finally {
    incrementJobStatsAndElapsed(jobId,triples,elapsed);
    if (velocityContext != null) {
      velocityContext.remove(Constants.MAIN_SUBJECT_ATTRIBUTE_NAME);
      velocityContext.remove(Constants.ROOT_ELEMENT_ATTRIBUTE_NAME);
      velocityContext.remove(Constants.JOB_CONFIGURATION_ATTRIBUTE_NAME);
    }
    checkForCompleteness(jobId);
  }
}

Fixed version (ground truth):
@Override public final void process(final Exchange exchange) throws Exception {
  final long begin=System.currentTimeMillis();
  final Message in=exchange.getIn();
  final String format=in.getHeader(Constants.FORMAT_ATTRIBUTE_NAME,String.class);
  final Integer jobId=in.getHeader(Constants.JOB_ID_ATTRIBUTE_NAME,Integer.class);
  final JobInstance configuration=cache.getJobInstance(jobId);
  if (configuration == null) {
    log.error(MessageCatalog._00038_UNKNOWN_JOB_ID,jobId);
    throw new IllegalArgumentException(String.valueOf(jobId));
  }
  if (in.getBody() instanceof NullObject) {
    incrementJobStatsAndElapsed(jobId,null,0);
    checkForCompleteness(jobId);
    return;
  }
  VelocityContext velocityContext=null;
  String triples=null;
  long elapsed=0;
  try {
    final Template template=velocityEngine.getTemplate(templateName(format));
    if (template == null) {
      log.error(MessageCatalog._00040_TEMPLATE_NOT_FOUND,format);
      return;
    }
    velocityContext=contexts.get();
    velocityContext.put(Constants.JOB_CONFIGURATION_ATTRIBUTE_NAME,configuration);
    populateVelocityContext(velocityContext,in,configuration);
    final Writer sw=new StringWriter();
    final Writer w=new BufferedWriter(sw);
    template.merge(velocityContext,w);
    w.flush();
    elapsed=System.currentTimeMillis() - begin;
    triples=sw.toString();
    in.setBody(triples);
    in.setHeader(Constants.GRAPH_ATTRIBUTE_NAME,graphName(configuration));
  }
 catch (  final ResourceNotFoundException exception) {
    log.error(MessageCatalog._00040_TEMPLATE_NOT_FOUND,exception,format);
  }
 finally {
    incrementJobStatsAndElapsed(jobId,triples,elapsed);
    if (velocityContext != null) {
      velocityContext.remove(Constants.MAIN_SUBJECT_ATTRIBUTE_NAME);
      velocityContext.remove(Constants.ROOT_ELEMENT_ATTRIBUTE_NAME);
      velocityContext.remove(Constants.JOB_CONFIGURATION_ATTRIBUTE_NAME);
    }
    checkForCompleteness(jobId);
  }
}