Question

struts2程序在MyEclipse8.5带的tomcat中可以运行，用自配置的tomcat报500的错误，其他程序用自配的可运行

错误描述是这样的
type Exception report

message

description The server encountered an internal error () that
prevented it from fulfilling this request.

exception
java.lang.NullPointerException
com.struts2.hello.HelloAction.execute(HelloAction.java:13)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)

note The full stack trace of the root cause is available in the
Apache Tomcat/7.0.27 logs.

Apache Tomcat/7.0.27

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Answer 1

不要用自带的tomcat 配置自己安装的 自带的tomcat 有很多莫名的错误 不好调试

Answer 2

exception
java.lang.NullPointerException
	com.struts2.hello.HelloAction.execute(HelloAction.java:13)

空指针异常，

HelloAction.java:13
这个文件的，第13行 看看代码吧