JSP编译错误!!快来
java.lang.NullPointerException
at   Search.GetResult.getResults(GetResult.java:42)
at   jsp_servlet._qcfd.__test._jspService(__test.java:171)
at   weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
at   weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
at   weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at   weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at   weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at   edu.nudt.rmgs.userpurview.PurviewFilter.doFilter(PurviewFilter.java:64)
at   weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at   weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6458)
at   weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at   weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at   weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3661)
at   weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2630)
at   weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at   weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)


------解决方案--------------------
public GetResult()throws Exception{
DataConn ss=new DataConn();
Connection conn = ss.getDataConn();
}

改成
public GetResult()throws Exception{
DataConn ss=new DataConn();
conn = ss.getDataConn();
}