1 Reply Latest reply on May 20, 2003 7:36 AM by tunaworks

    ClassNotFoundException

    koen Newbie

      Hello,

      I created a small war file wich contains these files:

      /logon.jsp
      /web-inf/classes/app/logonAction.class
      /web-inf/classes/app/logonForm.class
      /web-inf/classes/app/application.properties

      (the dtd and conf files in /web-inf and libraries in /lib)

      When I deploy my war everything seems ok. But if direct my browser to it I get an classnotfound error:

      14:53:40,218 INFO [Engine] action: Looking for Action instance for class app.LogonAction
      14:53:40,218 INFO [Engine] action: Double checking for Action instance already there
      14:53:40,218 INFO [Engine] action: Creating new Action instance
      14:53:40,218 ERROR [Engine] action: Error creating Action instance for path '/logon', class name 'app.LogonAction'
      java.lang.ClassNotFoundException: No ClassLoaders found for: app.LogonAction

      (I get the same for LogonForm)

      I dont seem why this isnt working. I'm using jboss3.0.4 with tomcat4.1.12 and struts 1.1.

      This is my struts-config file:


      <?xml version="1.0" encoding="ISO-8859-1" ?>

      <!DOCTYPE struts-config PUBLIC
      "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
      "file:///C:/struts-config_1_1.dtd">





      <!--

      This is a blank Struts configuration file with an example

      welcome action/page and other commented sample elements.



      Tiles and the Struts Validator are configured using the factory defaults

      and are ready-to-use.



      NOTE: If you have a generator tool to create the corresponding Java classes

      for you, you could include the details in the "form-bean" declarations.

      Otherwise, you would only define the "form-bean" element itself, with the

      corresponding "name" and "type" attributes, as shown here.

      -->





      <struts-config>



      <!-- ==================================== Data Source Configuration -->

      <!--

      <data-sources>

      <data-source>

      <set-property

      property="autoCommit"

      value="false"/>

      <set-property

      property="description"

      value="Example Data Source Configuration"/>

      <set-property

      property="driverClass"

      value="org.postgresql.Driver"/>

      <set-property

      property="maxCount"

      value="4"/>

      <set-property

      property="minCount"

      value="2"/>

      <set-property

      property="password"

      value="mypassword"/>

      <set-property

      property="url"

      value="jdbc:postgresql://localhost/mydatabase"/>

      <set-property

      property="user"

      value="myusername"/>

      </data-source>

      </data-sources>

      -->



      <!-- ======================================== Form Bean Definitions -->



      <form-beans>

      <form-bean name="logonForm" type="app.LogonForm" />


      <!-- sample form bean descriptor for an ActionForm

      <form-bean

      name="inputForm"

      type="app.InputForm"/>

      end sample -->



      <!-- sample form bean descriptor for a DynaActionForm

      <form-bean

      name="logonForm"

      type="org.apache.struts.action.DynaActionForm">

      <form-property

      name="username"

      type="java.lang.String"/>

      <form-property

      name="password"

      type="java.lang.String"/>

      end sample -->



      </form-beans>





      <!-- ================================= Global Exception Definitions -->



      <global-exceptions>

      <!-- sample exception handler



      end sample -->

      </global-exceptions>





      <!-- =================================== Global Forward Definitions -->



      <global-forwards>

      <!-- Default forward to "Welcome" action -->

      <!-- Demonstrates using index.jsp to forward -->



      </global-forwards>





      <!-- =================================== Action Mapping Definitions -->



      <action-mappings type="org.apache.struts.action.ActionMapping">


      <!-- Default "Welcome" action -->

      <!-- Forwards to Welcome.jsp -->






      <!-- sample input and input submit actions











      end samples -->





      </action-mappings>





      <!-- ===================================== Controller Configuration -->









      <!-- ================================ Message Resources Definitions -->



      <message-resources parameter="resources.application"/>





      <!-- ======================================= Plug Ins Configuration -->


      <!-- ========== Tiles plugin =================== -->
      <!-- -->
      <!--
      This plugin initialize Tiles definition factory. This later can takes some
      parameters explained here after. The plugin first read parameters from web.xml, then
      overload them with parameters defined here. All parameters are optional.
      The plugin should be declared in each struts-config file.
      - definitions-config: (optional)
      Specify configuration file names. There can be several comma
      separated file names (default: ?? )
      - moduleAware: (optional - struts1.1)
      Specify if the Tiles definition factory is module aware. If true (default),
      there will be one factory for each Struts module.
      If false, there will be one common factory for all module. In this later case,
      it is still needed to declare one plugin per module. The factory will be
      initialized with parameters found in the first initialized plugin (generally the
      one associated with the default module).
      true : One factory per module. (default)
      false : one single shared factory for all modules
      - definitions-parser-validate: (optional)
      Specify if xml parser should validate the Tiles configuration file.
      true : validate. DTD should be specified in file header. (default)
      false : no validation

      Paths found in Tiles definitions are relative to the main context.
      -->
      <!-- comment following if struts1.0.x -->
      <plug-in className="org.apache.struts.tiles.TilesPlugin" >
      <set-property property="definitions-config"
      value="/WEB-INF/tiles-defs.xml" />
      <set-property property="moduleAware" value="true" />
      <set-property property="definitions-parser-validate" value="true" />
      </plug-in>

      <!-- end comment if struts1.0.x -->

      <plug-in className="org.apache.struts.validator.ValidatorPlugIn">
      <set-property
      property="pathnames"
      value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
      </plug-in>

      </struts-config>

        • 1. Re: ClassNotFoundException
          tunaworks Newbie

          I had the same problem but I found the solution some messages further down. (The solution was posted by Petertje from the Netherlands).

          Instead of using
          (YourClass) Class.forName("yourClassName").newInstance();
          use
          (YourClass) Thread.currentThread().getContextClassLoader().loadClass("yourClassName").newInstance();

          This gave me instant result!

          Hope this works for you too.