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问答 方法调用中，提示出现空指针异常Fail to invoke ... For the reason: null
发布于 2716天前 作者 qq_7fafbecc 2619 次浏览 复制 上一个帖子 下一个帖子
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	public Object addPd(NutMap map) {
		SysUser user = (SysUser)Mvcs.getHttpSession().getAttribute(Globals.SESSION_USER_CODE);
		System.out.println(map);
		ProblemDemand pd = new ProblemDemand();
		ProblemDemand pd_return = new ProblemDemand();
		pd = (ProblemDemand)map.get("pd");
		pd.setPdId(comServiceBo.getNextId("PROBLEMDEMAND","PDID"));
		pd.setCreater(user.getUserId());
		pd.setCreateTime(new Date());
		pd.setPdState("1");
		pd.setCurrentOperator(user.getUserId());
		pd.setIsTest("0");
		pd.setIsFinish("0");
		pd_return = dao.insert(pd);
		//pd_return.setPdTypeText(getCodeTextByValue("PDTYPE",pd.getPdType()));
		problemDemandServiceBo.addPdEvent(pd_return,Globals.EVENT_TYPE_ADD);
		return pd_return;
	}

	public void addPdEvent(ProblemDemand pd,String eventType){
		SysUser user = (SysUser)Mvcs.getHttpSession().getAttribute(Globals.SESSION_USER_CODE);
		String temp1 = pd.getPdId();
		String temp2 = pd.getPdType();
		String pdType_text = getCodeTextByValue("PDTYPE",temp2);
		Event event = new Event();
		List<Event> oldEvents = new ArrayList<Event>();
		oldEvents = dao.query(Event.class, Cnd.where("pdId","=",pd.getPdId()));
		//新增事件
		if(eventType.equals(Globals.EVENT_TYPE_ADD) && oldEvents.size() == 0){
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			String str_curDate = sdf.format(new Date());
			event.setPdId(pd.getPdId());
			event.setEventId(1);
			event.setEventType(eventType);
			event.setOperator(user.getUserId());
			event.setOperateTime(new Date());
			//经办说明为空
			//event.setExplain(explain);
			event.setEventResult(user.getDisplayName()+"在"+str_curDate + "新增了一条编号为"+pd.getPdId()+"的"+pdType_text);
			dao.insert(event);
		}
	}

	protected String getCodeTextByValue(String codeType,String codeValue) {
		List<CodeMng> CodeMngList = new ArrayList<CodeMng>();
		CodeMngList = dao.query(CodeMng.class, Cnd.where("CODETYPE","=",codeType).and("CODE","",codeValue));
		String returnText = "";
		if(CodeMngList.size() != 0){
			returnText = CodeMngList.get(0).getCodeName();
		}
		returnText = codeValue;
		return returnText;
	}

2017-07-16 18:59:46,151 com.shlx.blood.service.ComServices.ExcuteServices(ComServices.java:198) DEBUG - Fail to invoke [com.shlx.blood.service.business.ProblemDemandService].addPd() by args:
 {pd=com.shlx.blood.entity.ProblemDemand@18792fe}
For the reason: null
org.nutz.lang.InvokingException: Fail to invoke [com.shlx.blood.service.business.ProblemDemandService].addPd() by args:
 {pd=com.shlx.blood.entity.ProblemDemand@18792fe}
For the reason: null
	at org.nutz.lang.Invoking.invoke(Invoking.java:195)
	at org.nutz.lang.Mirror.invoke(Mirror.java:1100)
	at com.shlx.blood.service.ComServices.ExcuteServices(ComServices.java:194)
	at com.shlx.blood.action.ProblemDemandAction.addPd(ProblemDemandAction.java:93)
	at com.shlx.blood.action.ProblemDemandAction$$FASTCLASS._invoke(ProblemDemandAction.java:1)
	at org.nutz.lang.reflect.AbstractFastClass.invoke(AbstractFastClass.java:143)
	at org.nutz.lang.reflect.FastClassFactory.invoke(FastClassFactory.java:67)
	at org.nutz.mvc.impl.processor.MethodInvokeProcessor.process(MethodInvokeProcessor.java:27)
	at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
	at org.nutz.mvc.impl.processor.AdaptorProcessor.process(AdaptorProcessor.java:33)
	at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
	at org.nutz.mvc.impl.processor.ActionFiltersProcessor.process(ActionFiltersProcessor.java:58)
	at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
	at org.nutz.mvc.impl.processor.ModuleProcessor.process(ModuleProcessor.java:123)
	at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
	at org.nutz.mvc.impl.processor.EncodingProcessor.process(EncodingProcessor.java:27)
	at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
	at org.nutz.mvc.impl.processor.UpdateRequestAttributesProcessor.process(UpdateRequestAttributesProcessor.java:15)
	at org.nutz.mvc.impl.NutActionChain.doChain(NutActionChain.java:44)
	at org.nutz.mvc.impl.ActionInvoker.invoke(ActionInvoker.java:67)
	at org.nutz.mvc.ActionHandler.handle(ActionHandler.java:31)
	at org.nutz.mvc.NutFilter.doFilter(NutFilter.java:198)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
	at com.shlx.blood.framework.BaseServiceBo.getCodeTextByValue(BaseServiceBo.java:40)
	at com.shlx.blood.service.bo.ProblemDemandServiceBo.addPdEvent(ProblemDemandServiceBo.java:99)
	at com.shlx.blood.service.business.ProblemDemandService.addPd(ProblemDemandService.java:94)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.nutz.lang.Invoking$DefaultInvoker.invoke(Invoking.java:47)
	at org.nutz.lang.Invoking.invoke(Invoking.java:192)
	... 40 more
10 回复

40行是哪一行

		CodeMngList = dao.query(CodeMng.class, Cnd.where("CODETYPE","=",codeType).and("CODE","",codeValue));

dao是null？

我擦...

getCodeTextByValue()方法中的dao确实是null ... 可是为什么在外层的方法addPd() 和addPdEvent()中又不是空的呢？

getCodeTextByValue()是addPdEvent()方法的父类的方法

问题解决了！但是没搞懂有的方法里dao是null，有的又不是空的，不过还是谢谢 @wendal

注入没写对吧

@IocBean
public class BaseServiceBo {

	/**
	 * 定义LOG
	 */
	protected final Log log = Logs.get();

	@Inject
	protected Dao dao; 
	
	/**
	 * 根据codeType和codeValue到CodeMng中找到codeText
	 * @return String
	 */
	protected String getCodeTextByValue(String codeType,String codeValue) {
		List<CodeMng> CodeMngList = new ArrayList<CodeMng>();
		CodeMngList = dao.query(CodeMng.class, Cnd.where("CODETYPE","=",codeType).and("CODE","=",codeValue));
		String returnText = "";
		if(CodeMngList.size() != 0){
			returnText = CodeMngList.get(0).getCodeName();
		}
		returnText = codeValue;
		return returnText;
	}

	
	
}

写了的

如果同一个类出现dao有时候是null，有时候不是，那么，出现null的那些情形，是这个类的实例自行new，而不是从ioc容器取出

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