Program: 116065
Project: 116065
Buggy source:
public static GroupInstance handleGroupInstanceCreatedEvent(String appId,String groupId,String parentId,String networkPartitionId,String partitionId){
  GroupInstance instance=null;
  ApplicationHolder.acquireWriteLock();
  try {
    if (log.isDebugEnabled()) {
      log.debug("String_Node_Str" + groupId + "String_Node_Str"+ appId);
    }
    Applications applications=ApplicationHolder.getApplications();
    Application application=applications.getApplication(appId);
    if (application == null) {
      log.warn(String.format("String_Node_Str",appId));
      return instance;
    }
    Group group=application.getGroupRecursively(groupId);
    if (group == null) {
      log.warn(String.format("String_Node_Str",groupId));
      return instance;
    }
    GroupStatus status=GroupStatus.Created;
    String instanceId=parentId;
    int minGroupInstances=group.getGroupMinInstances();
    int maxGroupInstances=group.getGroupMaxInstances();
    if (minGroupInstances > 1 || maxGroupInstances > 1 || group.isGroupScalingEnabled()) {
      instanceId=group.getNextInstanceId(groupId);
    }
    if (!group.containsInstanceContext(instanceId)) {
      instance=new GroupInstance(groupId,instanceId);
      instance.setParentId(parentId);
      instance.setPartitionId(partitionId);
      instance.setNetworkPartitionId(networkPartitionId);
      instance.setStatus(status);
      group.addInstance(instanceId,instance);
      ApplicationHolder.persistApplication(application);
      ApplicationsEventPublisher.sendGroupInstanceCreatedEvent(appId,groupId,instance);
    }
 else {
      log.warn("String_Node_Str" + groupId + "String_Node_Str"+ instanceId);
    }
  }
  finally {
    ApplicationHolder.releaseWriteLock();
  }
  return instance;
}

Fixed version (ground truth):
public static GroupInstance handleGroupInstanceCreatedEvent(String appId,String groupId,String parentId,String networkPartitionId,String partitionId){
  GroupInstance groupInstance=null;
  ApplicationHolder.acquireWriteLock();
  try {
    if (log.isDebugEnabled()) {
      log.debug("String_Node_Str" + groupId + "String_Node_Str"+ appId);
    }
    Applications applications=ApplicationHolder.getApplications();
    Application application=applications.getApplication(appId);
    if (application == null) {
      log.warn(String.format("String_Node_Str",appId));
      return groupInstance;
    }
    Group group=application.getGroupRecursively(groupId);
    if (group == null) {
      log.warn(String.format("String_Node_Str",groupId));
      return groupInstance;
    }
    GroupStatus status=GroupStatus.Created;
    String instanceId=parentId;
    int minGroupInstances=group.getGroupMinInstances();
    int maxGroupInstances=group.getGroupMaxInstances();
    if (minGroupInstances > 1 || maxGroupInstances > 1 || group.isGroupScalingEnabled()) {
      instanceId=group.getNextInstanceId(groupId);
    }
    if (!group.containsInstanceContext(instanceId)) {
      groupInstance=new GroupInstance(groupId,instanceId);
      groupInstance.setParentId(parentId);
      groupInstance.setPartitionId(partitionId);
      groupInstance.setNetworkPartitionId(networkPartitionId);
      groupInstance.setStatus(status);
      group.addInstance(instanceId,groupInstance);
      ApplicationHolder.persistApplication(application);
      ApplicationsEventPublisher.sendGroupInstanceCreatedEvent(appId,groupId,groupInstance);
    }
 else {
      log.warn("String_Node_Str" + groupId + "String_Node_Str"+ instanceId);
    }
  }
  finally {
    ApplicationHolder.releaseWriteLock();
  }
  return groupInstance;
}