李涛的博客

org.apache.jasper.JasperException   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)   javax.servlet.http.HttpServlet.service(HttpServlet.java:810)   org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)      

root cause    

java.lang.NullPointerException   org.apache.struts.taglib.TagUtils.retrieveMessageResources(TagUtils.java:1219)   org.apache.struts.taglib.TagUtils.message(TagUtils.java:1082)   org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:226)   org.apache.jsp.hello_jsp._jspx_meth_bean_message_0(org.apache.jsp.hello_jsp:173)   org.apache.jsp.hello_jsp._jspx_meth_html_html_0(org.apache.jsp.hello_jsp:123)   org.apache.jsp.hello_jsp._jspService(org.apache.jsp.hello_jsp:94)   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)   javax.servlet.http.HttpServlet.service(HttpServlet.java:810)   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)   javax.servlet.http.HttpServlet.service(HttpServlet.java:810)   org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)

解决方法：

空指针错误，一般你的某个地方没判断是否为空。

我们编程的时候不注意的话，在取到一个对象却没判断是否为空的话就去取对象的属性值，就会出现这种情况，这就需要我们养成良好的编程习惯，判断取到的对象是否为空，然后再去取值。