struts2整合jfreechart问题

Question

2011-11-22 10:32:35 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet default threw exception
java.lang.NullPointerException
at org.apache.catalina.connector.Request.parseParameters(Request.java:2593)
at org.apache.catalina.connector.Request.getParameterNames(Request.java:1144)
at org.apache.catalina.connector.RequestFacade.getParameterNames(RequestFacade.java:371)
at javax.servlet.ServletRequestWrapper.getParameterNames(ServletRequestWrapper.java:178)
at com.shcb.action.BasicAction.getParamsToMap(BasicAction.java:56)
at com.shcb.action.JFreeChartAction.getParamsToMap(JFreeChartAction.java:50001)
at com.shcb.action.JFreeChartAction$$M$141010c8.getFcyStatisticalPieChartByCcode(JFreeChartAction.java:78)
at com.shcb.action.JFreeChartAction$$A$141010c8.getFcyStatisticalPieChartByCcode()
at com.shcb.action.JFreeChartAction.getFcyStatisticalPieChartByCcode(JFreeChartAction.java:87)
at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:404)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:267)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:229)
at com.shcb.interceptor.CalcRuntimeInterceptor.doIntercept(CalcRuntimeInterceptor.java:23)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.shcb.interceptor.CalcRuntimeInterceptor.intercept(CalcRuntimeInterceptor.java:50001)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)

Answer 1

[code="java"]values[0] = request.getParameter(key); [/code]
这句话错了

[code="java"]String[] values = null;// 这里没有初始化，下面就直接给values[0]赋值了，然后就NullPointerException[/code]