Another Error 500

When trying to read this question:

https://www.instructables.com/answers/Why-does-my-multimeter-read-18vdc-on-a-12vdc-walwa/

I got an "error 500" message:

-------------------------------------------------

500 Servlet Exception

javax.servlet.ServletException: javax.servlet.jsp.JspException: ServletException
in '/common/layout3col.jspx': java.lang.reflect.InvocationTargetException
at com.caucho.jsp.PageContextImpl.handlePageException(PageContextImpl.java:1120)
at _jsp._pages._error._error__jsp._jspService(pages/error/error.jsp:9)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.instructables.servlet.ErrorServlet.service(ErrorServlet.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
at com.caucho.server.webapp.RequestDispatcherImpl.error(RequestDispatcherImpl.java:113)
at com.caucho.server.webapp.ErrorPageManager.sendServletError(ErrorPageManager.java:362)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:175)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:514)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:527)
at com.caucho.util.ThreadPool.run(ThreadPool.java:449)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.servlet.jsp.JspException: ServletException in '/common/layout3col.jspx':
java.lang.reflect.InvocationTargetException
at org.apache.tiles.taglib.InsertTag$InsertHandler.doEndTag(InsertTag.java:923)
at org.apache.tiles.taglib.InsertTag.doEndTag(InsertTag.java:457)
at _jsp._pages._error._error__jsp._jspService(pages/error/error.jsp:9)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.instructables.servlet.ErrorServlet.service(ErrorServlet.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
at com.caucho.server.webapp.RequestDispatcherImpl.error(RequestDispatcherImpl.java:113)
at com.caucho.server.webapp.ErrorPageManager.sendServletError(ErrorPageManager.java:362)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:175)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:514)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:527)
at com.caucho.util.ThreadPool.run(ThreadPool.java:449)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.servlet.ServletException: javax.servlet.jsp.el.ELException:
java.lang.reflect.InvocationTargetException
at com.caucho.jsp.PageContextImpl.handlePageException(PageContextImpl.java:1120)
at _jsp._common._nav__jsp._jspService(_nav__jsp.java:237)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:933)
at _jsp._common._layout3col__jspx._jspService(file:/home/instruct/deploy/instructables/common/layout3col.jspx:193)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:933)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:870)
at org.apache.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:143)
at org.apache.tiles.TilesUtil.doInclude(TilesUtil.java:149)
at org.apache.tiles.taglib.InsertTag.doInclude(InsertTag.java:760)
at org.apache.tiles.taglib.InsertTag$InsertHandler.doEndTag(InsertTag.java:892)
at org.apache.tiles.taglib.InsertTag.doEndTag(InsertTag.java:457)
at _jsp._pages._error._error__jsp._jspService(pages/error/error.jsp:9)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.instructables.servlet.ErrorServlet.service(ErrorServlet.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
at com.caucho.server.webapp.RequestDispatcherImpl.error(RequestDispatcherImpl.java:113)
at com.caucho.server.webapp.ErrorPageManager.sendServletError(ErrorPageManager.java:362)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:175)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:514)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:527)
at com.caucho.util.ThreadPool.run(ThreadPool.java:449)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.servlet.jsp.el.ELException: java.lang.reflect.InvocationTargetException
at com.caucho.el.StaticMethodExpr.evalMethod(StaticMethodExpr.java:142)
at com.caucho.el.FunctionExpr.evalObject(FunctionExpr.java:71)
at com.caucho.el.Expr.print(Expr.java:325)
at _jsp._common._nav__jsp._jspService(common/nav.jsp:186)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:933)
at _jsp._common._layout3col__jspx._jspService(file:/home/instruct/deploy/instructables/common/layout3col.jspx:193)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:933)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:870)
at org.apache.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:143)
at org.apache.tiles.TilesUtil.doInclude(TilesUtil.java:149)
at org.apache.tiles.taglib.InsertTag.doInclude(InsertTag.java:760)
at org.apache.tiles.taglib.InsertTag$InsertHandler.doEndTag(InsertTag.java:892)
at org.apache.tiles.taglib.InsertTag.doEndTag(InsertTag.java:457)
at _jsp._pages._error._error__jsp._jspService(pages/error/error.jsp:9)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.instructables.servlet.ErrorServlet.service(ErrorServlet.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
at com.caucho.server.webapp.RequestDispatcherImpl.error(RequestDispatcherImpl.java:113)
at com.caucho.server.webapp.ErrorPageManager.sendServletError(ErrorPageManager.java:362)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:175)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:514)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:527)
at com.caucho.util.ThreadPool.run(ThreadPool.java:449)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor99.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.caucho.el.StaticMethodExpr.evalMethod(StaticMethodExpr.java:133)
at com.caucho.el.FunctionExpr.evalObject(FunctionExpr.java:71)
at com.caucho.el.Expr.print(Expr.java:325)
at _jsp._common._nav__jsp._jspService(common/nav.jsp:186)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:933)
at _jsp._common._layout3col__jspx._jspService(file:/home/instruct/deploy/instructables/common/layout3col.jspx:193)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:933)
at com.caucho.jsp.PageContextImpl.include(PageContextImpl.java:870)
at org.apache.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:143)
at org.apache.tiles.TilesUtil.doInclude(TilesUtil.java:149)
at org.apache.tiles.taglib.InsertTag.doInclude(InsertTag.java:760)
at org.apache.tiles.taglib.InsertTag$InsertHandler.doEndTag(InsertTag.java:892)
at org.apache.tiles.taglib.InsertTag.doEndTag(InsertTag.java:457)
at _jsp._pages._error._error__jsp._jspService(pages/error/error.jsp:9)
at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
at com.caucho.jsp.Page.pageservice(Page.java:570)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:485)
at com.caucho.server.webapp.RequestDispatcherImpl.include(RequestDispatcherImpl.java:350)
at com.instructables.servlet.ErrorServlet.service(ErrorServlet.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)
at com.caucho.server.webapp.RequestDispatcherImpl.error(RequestDispatcherImpl.java:113)
at com.caucho.server.webapp.ErrorPageManager.sendServletError(ErrorPageManager.java:362)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:175)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:514)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:527)
at com.caucho.util.ThreadPool.run(ThreadPool.java:449)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at com.instructables.taglib.Functions.translateCategoryName(Functions.java:1008)

Resin Professional 3.0.28 (built Mon, 18 May 2009 02:21:41 PDT)

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rachel7 years ago
Fixed!
Kiteman (author)  rachel7 years ago
Thanks.
Do new entries in the bugs forum not automatically sound alarm bells at HQ ?
Kiteman (author)  steveastrouk7 years ago
I believe so - the more sufferers they know about, the easier it is to locate and fix the bug.
kelseymh7 years ago