一个JSP页面的错误，不知道哪错了，求大神来看看

心中自然无码 2013-06-26 01:45:42

严重: Servlet.service() for servlet jsp threw exception

java.lang.NullPointerException

	at org.apache.jsp.pic_jsp._jspService(pic_jsp.java:74)

	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)

	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)

	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)

	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)

	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)

	at java.lang.Thread.run(Thread.java:619)

JSP页面

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@page import="org.jbpm.api.*,java.util.*,org.jbpm.api.model.*" %>

<%

	String id = request.getParameter("id");

	ProcessEngine processEngine = Configuration.getProcessEngine();

	RepositoryService repositoryService = processEngine.getRepositoryService();

	ExecutionService executionService = processEngine.getExecutionService();

	ProcessInstance processInstance = executionService.findProcessInstanceById(id);

	Set<String> activityNames = processInstance.findActiveActivityNames();

	

	ActivityCoordinates ac = repositoryService.getActivityCoordinates(processInstance.getProcessDefinitionId(),activityNames.iterator().next());

%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<img src="pic.jsp?id=<%=id%>" style="position:absolute;left:0px;top:0px;">

<div style="position:absolute;border:1px solid red;left:<%=ac.getX()%>px;top:<%=ac.getY()%>px;width:<%=ac.getWidth()%>px;height:<%=ac.getHeight()%>px;"></div>

</body>

</html>

另一个JSP

<%@page import="org.jbpm.api.*,java.io.*"%>

<%

	ProcessEngine processEngine = Configuration.getProcessEngine();

	RepositoryService repositoryService = processEngine

			.getRepositoryService();

	ExecutionService executionService = processEngine

			.getExecutionService();

	String id = request.getParameter("id");

	ProcessInstance processInstance = executionService

			.findProcessInstanceById(id);

	String processDefinitionId = processInstance

			.getProcessDefinitionId();

	ProcessDefinition processDefinition = repositoryService

			.createProcessDefinitionQuery().processDefinitionId(

					processDefinitionId).uniqueResult();

	InputStream inputStream = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(),"leave.png");

	byte[] b = new byte[1024];

	int len = -1;

	while ((len = inputStream.read(b, 0, 1024)) != -1) {

		response.getOutputStream().write(b, 0, len);

	}

%>

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蝴蝶公子 2014-01-20

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兄弟，那是因为你传的Id值是kongzhi空值导致的而非代码的错误好好检查下view.jsp中的id你真的传过来了吗？

心中自然无码 2013-06-26

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谢谢各位啊，分太少了，每人分一点吧。

ZHOU西口 2013-06-26

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看你的jsp编译后的java文件，找74行的错误~

zcwgogo 2013-06-26

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那你到这JSP页面里面下个断点很容易看出来的。

火影之贺 2013-06-26

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引用 6 楼 MingTianDeQiJi 的回复:

你试试在看看tomcat里的 D:\Tomcat 7.0\work\Catalina\localhost\你项目\org\apache\jsp\ *\pic_jsp 里看看编译过的代码哪出的问题或者一行一行输出看看哪行获取不了数据

看这个兄弟的的回复，你要看jsp编译后的java代码的对应行！

心中自然无码 2013-06-26

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引用 5 楼 zcwgogo 的回复:

pic jsp 的 74 行是哪行？在你填出来的代码哪行

<%@page import="org.jbpm.api.*,java.io.*"%>
<%
    ProcessEngine processEngine = Configuration.getProcessEngine();
    RepositoryService repositoryService = processEngine
            .getRepositoryService();
    ExecutionService executionService = processEngine
            .getExecutionService();
    String id = request.getParameter("id");
    ProcessInstance processInstance = executionService
            .findProcessInstanceById(id);
    String processDefinitionId = processInstance
            .getProcessDefinitionId();
    ProcessDefinition processDefinition = repositoryService
            .createProcessDefinitionQuery().processDefinitionId(
                    processDefinitionId).uniqueResult();
    InputStream inputStream = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(),"leave.png");
    byte[] b = new byte[1024];
    int len = -1;
    while ((len = inputStream.read(b, 0, 1024)) != -1) {
        response.getOutputStream().write(b, 0, len);
    }
%>

压根就没有74行，就是这个页面，太奇葩了