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java.lang.NullPointerException at org.apache.jsp.index_jsp._jspInit(index_jsp.ja

2012-09-14 16:03 751 查看
环境:Tomcat6 + jdk6

Tomcat服务启动成功,但访问index.jsp出错,Tomcat报错如下:

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

java.lang.NullPointerException

at org.apache.jsp.index_jsp._jspInit(index_jsp.java:23)

at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)

at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)

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.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:389)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

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:861)

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

at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1584)

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

最后找到原因:jsp-api.jar冲突。

jsp-api.jar冲突会造成jsp页面无法解析。

写自定义标签的时候请注意,在工程编译的时候可以引用jsp-api.jar,但发布的时候工程不要包含此包,因为Tomcat已包含。

用于开发,而不用于发布

解决方法1:User Library

选中项目-->右击-->properties-->Java Build Path --> Add Library --> 选中 User Liberary -->

Next --> User Libraries... --> New -->如下一定要选中:口 System Library.... (作为系统库像JDK一样)



--> Add Jars -->导入 与Tomcat冲突jar --> 选中jsp-jar OK

解决方法2:修改配置

打开项目目录,编辑.classpath文件

将:<classpathentry kind="lib" path="/............/jsp-jar"/>

改:<classpathentry kind="con" path="/............/jsp-jar"/>

刷新项目OK

结果导入的jar包显示为系统库:

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