Program: 18344
Project: 18344
Buggy source:
@Override protected Object doExecute() throws Exception {
  Group group=groupManager.findGroupByName(groupName);
  if (group == null) {
    System.err.println("String_Node_Str" + groupName + "String_Node_Str");
    return null;
  }
  if (eventProducer.getSwitch().getStatus().equals(SwitchStatus.OFF)) {
    System.err.println("String_Node_Str");
    return null;
  }
  Map<String,String> clusterRepositories=clusterManager.getMap(Constants.REPOSITORIES_MAP + Configurations.SEPARATOR + groupName);
  Map<String,FeatureState> clusterFeatures=clusterManager.getMap(Constants.FEATURES_MAP + Configurations.SEPARATOR + groupName);
  ClassLoader originalClassLoader=Thread.currentThread().getContextClassLoader();
  try {
    Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
    List<String> urls=new ArrayList<String>();
    Pattern pattern=Pattern.compile(repository);
    for (    String repositoryUrl : clusterRepositories.keySet()) {
      String repositoryName=clusterRepositories.get(repositoryUrl);
      if (repositoryName != null && !repositoryName.isEmpty()) {
        Matcher nameMatcher=pattern.matcher(repositoryName);
        if (nameMatcher.matches()) {
          urls.add(repositoryUrl);
        }
 else {
          Matcher uriMatcher=pattern.matcher(repositoryUrl);
          if (uriMatcher.matches()) {
            urls.add(repositoryUrl);
          }
        }
      }
 else {
        Matcher uriMatcher=pattern.matcher(repositoryUrl);
        if (uriMatcher.matches()) {
          urls.add(repositoryUrl);
        }
      }
    }
    for (    String url : urls) {
      boolean found=false;
      for (      String repository : clusterRepositories.keySet()) {
        if (this.repository.equals(repository)) {
          found=true;
          break;
        }
      }
      if (found) {
        Features repositoryModel=JaxbUtil.unmarshal(url,true);
        clusterRepositories.remove(url);
        for (        Feature feature : repositoryModel.getFeature()) {
          clusterFeatures.remove(feature.getName() + "String_Node_Str" + feature.getVersion());
        }
        ClusterRepositoryEvent event=new ClusterRepositoryEvent(url,RepositoryEvent.EventType.RepositoryRemoved);
        event.setUninstall(uninstall);
        event.setSourceGroup(group);
        event.setSourceNode(clusterManager.getNode());
        eventProducer.produce(event);
      }
 else {
        System.err.println("String_Node_Str" + url + "String_Node_Str"+ groupName);
      }
    }
  }
  finally {
    Thread.currentThread().setContextClassLoader(originalClassLoader);
  }
  return null;
}

Fixed version (ground truth):
@Override protected Object doExecute() throws Exception {
  Group group=groupManager.findGroupByName(groupName);
  if (group == null) {
    System.err.println("String_Node_Str" + groupName + "String_Node_Str");
    return null;
  }
  if (eventProducer.getSwitch().getStatus().equals(SwitchStatus.OFF)) {
    System.err.println("String_Node_Str");
    return null;
  }
  Map<String,String> clusterRepositories=clusterManager.getMap(Constants.REPOSITORIES_MAP + Configurations.SEPARATOR + groupName);
  Map<String,FeatureState> clusterFeatures=clusterManager.getMap(Constants.FEATURES_MAP + Configurations.SEPARATOR + groupName);
  ClassLoader originalClassLoader=Thread.currentThread().getContextClassLoader();
  try {
    Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
    List<String> urls=new ArrayList<String>();
    Pattern pattern=Pattern.compile(repository);
    for (    String repositoryUrl : clusterRepositories.keySet()) {
      String repositoryName=clusterRepositories.get(repositoryUrl);
      if (repositoryName != null && !repositoryName.isEmpty()) {
        Matcher nameMatcher=pattern.matcher(repositoryName);
        if (nameMatcher.matches()) {
          urls.add(repositoryUrl);
        }
 else {
          Matcher uriMatcher=pattern.matcher(repositoryUrl);
          if (uriMatcher.matches()) {
            urls.add(repositoryUrl);
          }
        }
      }
 else {
        Matcher uriMatcher=pattern.matcher(repositoryUrl);
        if (uriMatcher.matches()) {
          urls.add(repositoryUrl);
        }
      }
    }
    for (    String url : urls) {
      boolean found=false;
      for (      String repository : clusterRepositories.keySet()) {
        if (this.repository.equals(url)) {
          found=true;
          break;
        }
      }
      if (found) {
        Features repositoryModel=JaxbUtil.unmarshal(url,true);
        clusterRepositories.remove(url);
        for (        Feature feature : repositoryModel.getFeature()) {
          clusterFeatures.remove(feature.getName() + "String_Node_Str" + feature.getVersion());
        }
        ClusterRepositoryEvent event=new ClusterRepositoryEvent(url,RepositoryEvent.EventType.RepositoryRemoved);
        event.setUninstall(uninstall);
        event.setSourceGroup(group);
        event.setSourceNode(clusterManager.getNode());
        eventProducer.produce(event);
      }
 else {
        System.err.println("String_Node_Str" + url + "String_Node_Str"+ groupName);
      }
    }
  }
  finally {
    Thread.currentThread().setContextClassLoader(originalClassLoader);
  }
  return null;
}