Program: 53667
Project: 53667
Buggy source:
@Override public void serialize(AgentInfo agentInfo,JsonGenerator jgen,SerializerProvider provider) throws IOException, JsonProcessingException {
  jgen.writeStartObject();
  jgen.writeStringField("String_Node_Str",agentInfo.getApplicationName());
  jgen.writeStringField("String_Node_Str",agentInfo.getAgentId());
  jgen.writeNumberField("String_Node_Str",agentInfo.getStartTimestamp());
  jgen.writeStringField("String_Node_Str",agentInfo.getHostName());
  jgen.writeStringField("String_Node_Str",agentInfo.getIp());
  jgen.writeStringField("String_Node_Str",agentInfo.getPorts());
  final ServiceType serviceType=serviceTypeRegistryService.findServiceType(agentInfo.getServiceTypeCode());
  jgen.writeStringField("String_Node_Str",serviceType.getDesc());
  jgen.writeNumberField("String_Node_Str",agentInfo.getPid());
  jgen.writeStringField("String_Node_Str",agentInfo.getVmVersion());
  jgen.writeStringField("String_Node_Str",agentInfo.getAgentVersion());
  jgen.writeObjectField("String_Node_Str",agentInfo.getServerMetaData());
  AgentStatus status=agentInfo.getStatus();
  if (status == null) {
    status=new AgentStatus(agentInfo.getAgentId());
    status.setState(AgentLifeCycleState.UNKNOWN);
  }
  jgen.writeObjectField("String_Node_Str",status);
  jgen.writeNumberField("String_Node_Str",agentInfo.getInitialStartTimestamp());
  if (matcherGroupList != null) {
    jgen.writeFieldName("String_Node_Str");
    jgen.writeStartArray();
    for (    MatcherGroup matcherGroup : matcherGroupList) {
      if (matcherGroup.ismatchingType(agentInfo)) {
        LinkInfo linkInfo=matcherGroup.makeLinkInfo(agentInfo);
        jgen.writeStartObject();
        jgen.writeStringField("String_Node_Str",linkInfo.getLinkName());
        jgen.writeStringField("String_Node_Str",linkInfo.getLinkUrl());
        jgen.writeStringField("String_Node_Str",linkInfo.getLinktype());
        jgen.writeEndObject();
      }
    }
    jgen.writeEndArray();
  }
  jgen.writeEndObject();
}

Fixed version (ground truth):
@Override public void serialize(AgentInfo agentInfo,JsonGenerator jgen,SerializerProvider provider) throws IOException, JsonProcessingException {
  jgen.writeStartObject();
  jgen.writeStringField("String_Node_Str",agentInfo.getApplicationName());
  jgen.writeStringField("String_Node_Str",agentInfo.getAgentId());
  jgen.writeNumberField("String_Node_Str",agentInfo.getStartTimestamp());
  jgen.writeStringField("String_Node_Str",agentInfo.getHostName());
  jgen.writeStringField("String_Node_Str",agentInfo.getIp());
  jgen.writeStringField("String_Node_Str",agentInfo.getPorts());
  final ServiceType serviceType=serviceTypeRegistryService.findServiceType(agentInfo.getServiceTypeCode());
  jgen.writeStringField("String_Node_Str",serviceType.getDesc());
  jgen.writeNumberField("String_Node_Str",agentInfo.getPid());
  jgen.writeStringField("String_Node_Str",agentInfo.getVmVersion());
  jgen.writeStringField("String_Node_Str",agentInfo.getAgentVersion());
  jgen.writeObjectField("String_Node_Str",agentInfo.getServerMetaData());
  AgentStatus status=agentInfo.getStatus();
  if (status != null) {
    jgen.writeObjectField("String_Node_Str",status);
  }
  jgen.writeNumberField("String_Node_Str",agentInfo.getInitialStartTimestamp());
  if (matcherGroupList != null) {
    jgen.writeFieldName("String_Node_Str");
    jgen.writeStartArray();
    for (    MatcherGroup matcherGroup : matcherGroupList) {
      if (matcherGroup.ismatchingType(agentInfo)) {
        LinkInfo linkInfo=matcherGroup.makeLinkInfo(agentInfo);
        jgen.writeStartObject();
        jgen.writeStringField("String_Node_Str",linkInfo.getLinkName());
        jgen.writeStringField("String_Node_Str",linkInfo.getLinkUrl());
        jgen.writeStringField("String_Node_Str",linkInfo.getLinktype());
        jgen.writeEndObject();
      }
    }
    jgen.writeEndArray();
  }
  jgen.writeEndObject();
}