For the past couple of days, every time I try to run my web application, Error - 503 has been showing up. This happens even when I try to go to the admin page. Is this a problem with Google?
It's important when creating a GAE project that any .class that extends HttpServlet and are used as entry point to your Google App are mapped in web.xml found in war/WEB-INF as pictured below.
Java Servlets you create that extend HttpServlet must be mapped in the web.xml like the following:-
In this Test GAE project ecipse generated sample code that created a Java Servlet called TestServlet.class that extends HttpServlet and is appropriately mapped.
To run your app you need to include the url mapped to the TestServlet.class found in the web.xml (In this case /test) in your index.html. (In the case of generated project sample code created by eclipse this will already have been done).
Once your Java Servlets are correctly mapped in the web.xml and included in your index.html the mapped url that is clicked will invoke the appropriate Servlet and run your app.
This will eliminate common 503 errors in terms of new project setup.
Related
Experts,
My dynamic web project having 3 JSP page and 3 servlets .. and everthing was working fine till date.
when i executed the same project today, it was showing this below message.
The webpage cannot be found - HTTP 404
I deleted the whole project after trying multiple checks... now in web.xml if i remove the servlets section, its displaying the jsp content. but if i add the servlet back its throwing same page cannot be found :(
no error in project and i dont see any logs in eclipse... can someone please tel me why this is happening?
Appreciate your input. Thanks
Below are a few general suggestions on debugging web apps:
3 and 4 would be the first checks for 404.
Try to start the web app in the debug mode, and place the break point in the servlet method: any hit? (or just put a System.out.println in the Servlet);
Check the structure of the dynamic web project in Eclipse: are the compiled java classes of the servlets in there?
Check the context path (url) of the dynamic web project in eclipse project config: not accidentally changed?
Check the log files of the tomcat (access logs and catalina logs) your dynamic web project is associated with.
Currently working an application that is moving from JBOSS 4 (java 6) to JBOSS 7.1 (Java 8). It had no REST WS - only SOAP and worked with Servlets.
I added my WAR containing a basic REST Service (ApplicationPath class with 1 resource class and a web.xml (empty since I'm using RESTEasy implementation which should scan my classes)) to the main EAR.
During deployment, I see no errors in my logs and it says my .war has been deployed and my web context registered.
However, whenever I call one of my resource's endpoint I get the default JBOSS response for Error 404 Not Found (the url is correct though) and when I try to call the same URL but by using PUT or POST I get the message "Http Method POST is not supported by this URL" which is typically an error from Custom Servlets.
Is it possible that another Servlet is listening to my path or taking over things? Even if outside of my web context? How could I investigate/debug this?
The problem came from the old RESTeasy Version - 3.0.7-Final that was being used, which has some known bugs with the #ApplicationPath annotation and web.xml configuration. After using the provided version of RESTeasy from the JBOSS 7 (version 3.6.1-SP2), everything worked like a charm.
i followed this article: http://www.mkyong.com/webservices/jax-ws/jax-ws-hello-world-example/
so i have:
HelloWorld http://pastebin.com/BJ3QA7pR
HelloWorldImpl http://pastebin.com/RM5SBZ5C
HelloWorldPublisher http://pastebin.com/H525WevK
which serves as the endpoint.
on the other side i have the client which i generated with wsimport:
HelloWorld http://pastebin.com/g07H1exf
HelloWorldImplService http://pastebin.com/f0YWMiYt
this runs fine in eclispe without alfresco being involved. however, i want to call the webservice from alfresco (from java backed web script for example)
i tried to copy the client side stuff to my amp file and calling it from a webscript but it fails!
Caused by: java.lang.IncompatibleClassChangeError: Class com.ibm.wsdl.DefinitionImpl does not implement the requested interface javax.wsdl.extensions.AttributeExtensible
Webscript http://pastebin.com/7JksRdtU
1 - is there a more elegant way to configure the access to the wsdl by defining a spring bean (spring-ws) or such
2 - why is it not working? full trace: http://pastebin.com/ak1qzygA
using alfresco community 5.0.a
thanks
You will see IncompatibleClassChangeError usually when the dependancy/library jar has changed. Hence the method/code dependant on the library has to be recompiled against the changes.
Guessing the problem here has much to do with some dependancy jar being mispicked or an older version of jar present or one jar prioritized over the other. A look into the jars containing 'com.ibm.wsdl.DefinitionImpl' class in your classpath should be of some help.
I am attempting to embed tomcat in my existing Jersey web application.
I am able to get Tomcat running no problem, and even loading my JSP's from the webapp dir. The issue is getting it to see my WebApplicationInitializer class like it does in the full container. I'm fairly certain this is a class path issue, if I add a VirtualDirResource and set the context to it, my Jersey app loads. The issue there is, Jersey can no longer load my JSP Viewables. It returns 404. Again, I have no web.xml anywhere. Not sure what code would be helpful, so ask for code samples if you think you have an answer.
I have installed Tomcat 5.0 in order to execute a web application. How can I show my files which are present in Tomcat to the web browser? I tried http://hostname:8080/myfolder/login.html, but I can't see the files.
One more thing I know about JDBC and other database connectivity and I have developed a HTML page. How can I let a button in the page execute the code written in a Servlet and perform validations?
The simplest thing is to add to the root webapp. That is webapps/ROOT. Any file you put in there will be served unless you change the default configuration.
You should read about the details, of course.
I have installed Tomcat 5.0 in order to execute a web application.
First of all, why are you using the ancient (8 year old) Tomcat 5.0? If you can, rather grab the latest one, Tomcat 6.0.
How can I show my files which are present in Tomcat to the web browser? I tried http://hostname:8080/myfolder/login.html, but I can't see the files.
Is myfolder the context name or just a folder in your webcontent? If it's a context name, then you need to ensure that it's properly deployed. You can find details in the server logs in the /logs folder. If it is a folder in your webcontent and the webapplication is thus supposedly to be the "root" application, then you need to ensure that it's deployed as ROOT.
To learn more about using Tomcat, go through the documentation.
One more thing I know about JDBC and other database connectivity and I have developed a HTML page. How can I let a button in the page execute the code written in a Servlet and perform validations?
To the point, just create a class which extends HttpServlet, implement the doPost() method, define the servlet in web.xml and let the action attribute of the HTML <form> element point to an URL which is covered by the url-pattern of the servlet mapping in the web.xml.
As the question is pretty broad, I have the impression that you haven't learned in any way how to work with Tomcat and JSP/Servlets. I would strongly recommend to go through those tutorials to familarize yourself with JSP/Servlet on Tomcat and Eclipse (an IDE) first: Beginning and Intermediate-Level Servlet, JSP, and JDBC Tutorials
Tomcat is not a web server like, say, Apache. It's a servlet container. You can not just move file in a subfolder which seem to be what you did. You need to pack your web application in a .war and deploy it.
The URL should rather be http://host:8080/webapp/subfolder/login.jsp
Without much information it's hard to help. Please edit your question and describe what you've done so far.