严重: Servlet.service() for servlet [default] in context with path [/PersonalBlog] threw exceptionjava.lang.RuntimeException: org.apache.jasper.JasperException: java.lang.NullPointerException        at com.opensymphony.sitemesh.webapp.decorator.BaseWebAppDecorator.render(BaseWebAppDecorator.java:39)        at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:84)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)        at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareFilter.doFilter(StrutsPrepareFilter.java:82)        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)

无码无真相

看不清楚，哪里出来的呢？

为了黑马，为了美好的未来，加油哈，兄弟

有没有人帮我解决问题的根源啊？我这个好像跟数组越界有关，但是又不知道改哪里