Where do I put a servlet jar file in Tomcat 6?

3
votes

I have a servlet in a jar file which I want to deploy to my Tomcat 6 instance. I did the following things:

  1. added a servlet declaration in my root web.xml
  2. added a servlet-mapping in the root web.xml
  3. put my jar file in /tomcat/lib
  4. re-started my server

I am getting the following error when I direct to my servlet

javax.servlet.ServletException: Wrapper cannot find servlet class com.mypackage.myServlet or a class it depends on
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)

root cause

java.lang.ClassNotFoundException: com.mypackage.myServlet
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1516)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1361)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)

This says to me that my web.xml is configured correctly and I am successfully hitting the right URL pattern. So the question is... where do I put a servlet jar file in Tomcat 6 so it gets picked up in the CLASSPATH?

TIA

2
tomcatservletsclasspathtomcat6
@Bozho, anything positive to add to the discussion? Where did your answer go? – Simon

2 Answers

3
votes

Your servlet JAR files goes in the WAR's lib directory, not in the top-level Tomcat lib directory, i.e.

<war-root>
   /WEB-INF
      web.xml
   /lib
      myservlet.jar
1
votes

Although this is not the normal practice, it should work fine. Because it should in theory work, I've tested it locally and it works fine (Tomcat 6.0.20 and 7.0.5). You've probably a typo in the <servlet-class>. The classname of your servlet namely starts with a lowercase, which goes totally against the Java naming conventions. Try

<servlet-class>com.mypackage.MyServlet</servlet-class>

instead.

If that doesn't fix it, then unpack the JAR with some ZIP/RAR tool and verify if the com/mypackage/MyServlet.class file is present.

If the file is actually present, then you're probably using some IDE which has only a specific subset of the jars of Tomcat/lib in a copy of Tomcat which is controlled/managed by the IDE. Try deploy and run Tomcat standalone the hard way in command console.