Get ClassNotFound exception calling greetServlet when GWT Starter app is deployed on Tomcat

Question

Environment: Windows 7, Eclipse, GWT 2.5, Tomcat7, Java jre7

Created a GWT Web app project and let the sample code be generated. The app runs fine (w/o any code change) in Eclipse in debug mode. GWT compiled and deployed on Tomcat7 on the same machine. When a RPC request is made, get ClassNotFoundException for service implemention class GreetingServiceImpl. Log from Tomcat7 is below.

Do I need to add some setting that is missing in the generated sample code? I could not find any answer to this on the web. I am kind of blocked... please advise.

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Jan 28, 2013 11:55:34 AM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet greetServlet as unavailable
Jan 28, 2013 11:55:34 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet greetServlet
java.lang.ClassNotFoundException: com.test.sample.server.GreetingServiceImpl
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:527)
    at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:509)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:137)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1137)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:858)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
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What is GreetingServiceImpl? Is it deployed in a JAR or is it supposed to get copied directly over to WEB-INF/lib? — stevebot
Check my answer over here stackoverflow.com/questions/15144527/…. It should help. — Oleksii Duzhyi

stevebot stevebot · Accepted Answer · 2013-01-28T17:45:00

Try unpacking your WAR file and searching to make sure either the JAR file that contains GreetingsServiceImpl is in /WEB-INF/lib OR that the class GreetingsServiceImpl is in /WEB-INF/classes.

It is hard to say which folder to look in, without knowing what GreetingsServiceImpl is and how it gets incorporated into your build.

Get ClassNotFound exception calling greetServlet when GWT Starter app is deployed on Tomcat

1 Answers