HTTP Status 500错误 新手问题（jsp+tomcat+sql）
HTTP Status 500
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /left.jsp:117
114: <td width= "47 " height= "36 "> 名称: </td>
115: <td width= "91 "> <%=warename%> </td>
116: </tr>
117: <tr>
118: <td height= "29 "> 价格: </td>
119: <td height= "29 "> <%=wareprice%> 元 </td>
120: </tr>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:506)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:395)
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:802)
root cause
java.lang.NullPointerException
org.apache.jsp.index_jsp._jspService(index_jsp.java:275)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
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:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.
--------------------------------------------
Apache Tomcat/5.5.20
[解决办法]
NullPointerException
[解决办法]
空指针错误
也就是你的指针指到了一片空内存
[解决办法]
那就把代码帖详细点 好帮你找找
[解决办法]
P: /left.jsp:117 告诉你这个地方有错误
一般是属于空值异常 ，即
NullPointerException ，很常见的错误。
如果你在 left.jsp这个页面对一些变量或对象进行过操作的话，你可以在操作之前，用 if-else语句判断一下
if（****!=null）{
}else{
}
[解决办法]
org.apache.jsp.index_jsp._jspService(index_jsp.java:275)
在你的tomcat目录\work\Catalina\localhost\你的应用名\org\apache\jsp目录下找到index_jsp.java 看看第275行有什么错误，NullPointerException
[解决办法]
指针为空了，在用 <%=warename%> 和 <%=wareprice%> 这种变量时，要首先判断是否为空，然后才能调用它
我的异常网推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.myexception.cn/java-web/317.html
