Extends ValveBase class : java.lang.ClassNotFoundException

Question

I have created one web base application in java and i used the ValveBase class of java. The code is as below :

public class RenewSessionValve extends ValveBase {

    private String authenticationUrl = "j_security_check";

    @Override
    public void invoke(Request req, Response res) throws IOException,
            ServletException {
        // TODO Auto-generated method stub
        System.out.println("invoke in SessionFixationValve "+req.getRequestURI());
        if (req.getRequestURI().contains(authenticationUrl)) {

        // save old session
        Session oldSession = req.getSessionInternal(true);
        SavedRequest saved = (SavedRequest) oldSession.
        getNote(Constants.FORM_REQUEST_NOTE);
        System.out.println("before invalidating session");
        // invalidate old session
        req.getSession(true).invalidate();
        req.setRequestedSessionId(null);
        req.clearCookies();

        System.out.println("after invalidating session");
        // create a new session and set it to the request
        Session newSession = req.getSessionInternal(true);
        req.setRequestedSessionId(newSession.getId());

        System.out.println("saved obj is : "+saved);
        // copy data from the old session
        // to the new one
        if (saved != null) {
        newSession.setNote(Constants.FORM_REQUEST_NOTE, saved);
        }

        }
        System.out.println("before invoke");
        // after processing the request forward it
        getNext().invoke(req, res);
        }   
}

now i compiled the file and create a jar file of that project and put it into lib folder of server. part of my server.xml file which i changed :

<Host appBase="webapps" autoDeploy="false" name="localhost" unpackWARs="true" xmlNamespaceAware="false" xmlValidation="false" deployOnStartup="false" deployXML="false">
        <Valve className="com.cmc.RenewSessionValve" />
</Host>

now i create one new project and run it. it gives me error like below :

SEVERE: Begin event threw exception
java.lang.ClassNotFoundException: com.cmc.RenewSessionValve
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:205)
    at org.apache.tomcat.util.digester.Rule.begin(Rule.java:153)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1356)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1642)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:562)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:261)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Jun 23, 2014 10:33:16 AM org.apache.catalina.startup.Catalina load
WARNING: Catalina.start using conf/server.xml: 
java.lang.ClassNotFoundException: com.cmc.RenewSessionValve
    at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2806)
    at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2832)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1359)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1642)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:562)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:261)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: java.lang.ClassNotFoundException: com.cmc.RenewSessionValve
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:205)
    at org.apache.tomcat.util.digester.Rule.begin(Rule.java:153)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1356)
    ... 20 more
Jun 23, 2014 10:33:16 AM org.apache.tomcat.util.digester.Digester startElement

Answer 1

这可能是由于您将jar放在错误的服务器目录中。

Answer 2

For future reference - The custom valve source code must be exported into a jar file and placed inside lib folder of your tomcat directory. (not the same as your project directory)

Otherwise tomcat won't be able to find the custom class and will throw ClassNotFoundException