帮帮忙啊。。。。我的JSP有问题。。。。

Question

Error: 500
Internal Servlet Error:javax.servlet.ServletException
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:384)
at _0005csuccess_0002ejspsuccess_jsp_6._jspService(_0005csuccess_0002ejspsuccess_jsp_6.java:155)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:161)
at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:247)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:352)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at org.apache.tomcat.core.ServiceInvocationHandler.method(ServletWrapper.java:626)
at org.apache.tomcat.core.ServletWrapper.handleInvocation(ServletWrapper.java:534)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:378)
at org.apache.tomcat.core.Context.handleRequest(Context.java:644)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:440)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:144)
at org.apache.tomcat.service.TcpConnectionThread.run(TcpEndpoint.java:310)
at java.lang.Thread.run(Thread.java:479)Root cause:  
java.lang.NullPointerException
at _0005csuccess_0002ejspsuccess_jsp_6._jspService(_0005csuccess_0002ejspsuccess_jsp_6.java:115)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:161)
at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:247)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:352)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at org.apache.tomcat.core.ServiceInvocationHandler.method(ServletWrapper.java:626)
at org.apache.tomcat.core.ServletWrapper.handleInvocation(ServletWrapper.java:534)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:378)
at org.apache.tomcat.core.Context.handleRequest(Context.java:644)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:440)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:144)
at org.apache.tomcat.service.TcpConnectionThread.run(TcpEndpoint.java:310)
at java.lang.Thread.run(Thread.java:479)

Answer 1

有对象为空，然后你没有判断空就调用了..你system.out.println(“打印一下你用到的对象”);

Answer 2

jsp最后也是被编译成serlvet运行了
这种情况下可以在tomcat的work目录下
找到_0005csuccess_0002ejspsuccess_jsp_6.java
第115行，第155行
就可以直观地看到到底啥是空指针了

Answer 3

将后台代码都try,catch...
看下什么异常....

Answer 4

空指针，你的jsp没有验证，在服务台打印出来看看

Answer 5

Root cause: 
java.lang.NullPointerException空指针异常了 楼主

Answer 6

java中最典型的错误Root cause:   
java.lang.NullPointerException