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POUnder Tomcat java.lang.NoClassDefFoundError when accessing a servlet?
 

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  1. POUnder Tomcat java.lang.NoClassDefFoundError when accessing a servlet?
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    <p>I'm writing a web applicaion in Eclipse, and I'm using the XStream Serialization Library to generate My JSON.</p> <p>I've encapsulated the Code that builds up the JSON in a class which is called by my servelet. Then encapsulated class has a main method for testing and when I run it everything seems to work fine.</p> <p>However when I use the call the class from my servelet I get a <code>java.lang.NoClassDefFoundError</code> error, sayying that I've not loaded the XStream libraries. I assume I've got my build path wrong, but I've set the XStream libraries to be in the build path for the project, so as far as I know it should work.</p> <p>What is likely to be going wrong here?</p> <p>Following is the exact exception:</p> <pre><code>java.lang.ClassNotFoundException: com.thoughtworks.xstream.io.HierarchicalStreamDriver at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at SecurePaymentAjaxData.doPost(SecurePaymentAjaxData.java:44) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) </code></pre> <p>And here is the relavant code that uses the xstream class:</p> <pre><code>XStream xstream = new XStream(new JettisonMappedXmlDriver()); xstream.setMode(XStream.NO_REFERENCES); xstream.alias("CallDataUpdate", CallDataUpdate.class); xstream.alias("CardStatus", CardStatus.class); String jsonData = xstream.toXML(updateData); </code></pre> <p>I stress that this code works fine when run as a java application, I'm sure it's something to do with loading the libraries, I just don't know where I've gone wrong.</p>
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