xml - About servlet Exception -


web.xml

<?xml version="1.0" encoding="utf-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">   <display-name>servletexceptionhandling</display-name>   <welcome-file-list>     <welcome-file>index.html</welcome-file>   </welcome-file-list>    <error-page>     <error-code>404</error-code>     <location>/appexceptionhandler</location>   </error-page>    <error-page>   <exception-type>javax.servlet.servletexception</exception-type>   <location>/appexceptionhandler</location>   </error-page>    <error-page>   <exception-type>java.lang.throwable</exception-type>   <location>/appexceptionhandler</location> </error-page> </web-app>

myexceptionservlet.java

package com.journaldev.servlet.exception;  import java.io.ioexception; import javax.servlet.servletexception; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse;  @webservlet("/myexceptionservlet") public class myexceptionservlet extends httpservlet {     private static final long serialversionuid = 1l;      protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {         throw new servletexception("get method not supported.");     }  }

appexceptionhandler.java

package com.journaldev.servlet.exception;  import java.io.ioexception; import java.io.printwriter;  import javax.servlet.servletexception; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse;  @webservlet("/appexceptionhandler") public class appexceptionhandler extends httpservlet {     private static final long serialversionuid = 1l;      protected void doget(httpservletrequest request,             httpservletresponse response) throws servletexception, ioexception {         processerror(request, response);     }      protected void dopost(httpservletrequest request,             httpservletresponse response) throws servletexception, ioexception {         processerror(request, response);     }      private void processerror(httpservletrequest request,             httpservletresponse response) throws ioexception {         // analyze servlet exception         throwable throwable = (throwable) request                 .getattribute("javax.servlet.error.exception");         integer statuscode = (integer) request                 .getattribute("javax.servlet.error.status_code");         string servletname = (string) request                 .getattribute("javax.servlet.error.servlet_name");         if (servletname == null) {             servletname = "unknown";         }         string requesturi = (string) request                 .getattribute("javax.servlet.error.request_uri");         if (requesturi == null) {             requesturi = "unknown";         }          // set response content type           response.setcontenttype("text/html");            printwriter out = response.getwriter();           out.write("<html><head><title>exception/error details</title></head><body>");           if(statuscode != 500){               out.write("<h3>error details</h3>");               out.write("<strong>status code</strong>:"+statuscode+"<br>");               out.write("<strong>requested uri</strong>:"+requesturi);           }           else           {               out.write("<h3>exception details</h3>");               out.write("<ul><li>servlet name:"+servletname+"</li>");               out.write("<li>exception name:"+throwable.getclass().getname()+"</li>");               out.write("<li>requested uri:"+requesturi+"</li>");               out.write("<li>exception message:"+throwable.getmessage()+"</li>");               out.write("</ul>");           }            out.write("<br><br>");           out.write("<a href=\"index.html\">home page</a>");           out.write("</body></html>");     } }

1) problem facing not getting processerror method in servlet appexceptionhandler due not able see exception in front end.

so please tell have done mistake.


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