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Custom ClassLoader
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created by <a href="https://community.jboss.org/people/irbash">Irfan Basha</a> in <i>JBoss Microcontainer</i> - <a href="https://community.jboss.org/message/804773#804773">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi All, </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am trying to create a custom classloader which I can use to load few classes in my war (may be complete war in future). </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I found this article which explains how a custom classloader can be created: </p><p><span>(Custom ClassLoader (classloader-beans.xml)) </span><a class="jive-link-external-small" href="http://java.dzone.com/articles/a-look-inside-jboss-microconta-0" rel="nofollow" target="_blank">http://java.dzone.com/articles/a-look-inside-jboss-microconta-0</a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have few clarifications in this: </p><p>1) Where should I put the content of classloader-beans.xml ? (I have currently put it in jboss-beans.xml and placed it in WEB-INF)</p><p>2) Correct me if am wrong: The bean CB2 will be loaded using the customClassLoader... right ?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is how my jboss-beans.xml looks like: </p><p style="padding-left: 30px;"><span style="color: #339966;"><em><deployment xmlns="urn:jboss:bean-deployer:2.0"></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>          <classloader></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>                    <inject bean="custom-classloader:0.0.0" /></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>          </classloader></em></span></p><p style="padding-left: 30px;">  </p><p style="padding-left: 30px;"><span style="color: #339966;"><em>          <classloader name="custom-classloader" xmlns="urn:jboss:classloader:1.0"</em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>                    export-all="NON_EMPTY" import-all="true" /></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>          <bean name="CustomCL" class="com.beans.CustomClassLoader"></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>                    <constructor></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>                              <parameter></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>                                        <inject bean="custom-classloader:0.0.0" /></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>                              </parameter></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>                    </constructor></em></span></p><p style="padding-left: 30px;">  </p><p style="padding-left: 30px;"><span style="color: #339966;"><em>          </bean></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>          <bean name="CB1" class="com.Sample"></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>          <classloader></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>                    <inject bean="CustomCL" /></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em>          </classloader></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em></bean></em></span></p><p style="padding-left: 30px;"><span style="color: #339966;"><em></deployment></em></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #000000;">And I have the class CustomeClassLoader which just extends ClassLoader: </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 30px;"><span style="color: #339966;">public class CustomClassLoader extends ClassLoader</span></p><p style="padding-left: 30px;"><span style="color: #339966;">{</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   private Pattern pattern;</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   public CustomClassLoader(ClassLoader parent)</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   {</span></p><p style="padding-left: 30px;"><span style="color: #339966;">      super(parent);</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   }</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   public Class<?> loadClass(String name) throws ClassNotFoundException</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   {</span></p><p style="padding-left: 30px;"><span style="color: #339966;">      if (pattern == null || pattern.matcher(name).matches())</span></p><p style="padding-left: 30px;"><span style="color: #339966;">         return super.loadClass(name);</span></p><p style="padding-left: 30px;"><span style="color: #339966;">      else</span></p><p style="padding-left: 30px;"><span style="color: #339966;">         throw new ClassNotFoundException("Name '" + name + "' doesn't match pattern: " + pattern);</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   }</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   public void setPattern(String regexp)</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   {</span></p><p style="padding-left: 30px;"><span style="color: #339966;">      pattern = Pattern.compile(regexp);</span></p><p style="padding-left: 30px;"><span style="color: #339966;">   }</span></p><p style="padding-left: 30px;"><span style="color: #339966;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #000000;">and when I start JBoss I get this following error: </span></p><p>08:28:51,677 ERROR [AbstractKernelController] Error installing to PreInstall: na</p><p>me=CustomCL state=Real</p><p>java.lang.ClassNotFoundException: com.beans.CustomClassLoader</p><p>        at java.net.URLClassLoader$1.run(Unknown Source)</p><p>        at java.net.URLClassLoader$1.run(Unknown Source)</p><p>        at java.security.AccessController.doPrivileged(Native Method)</p><p>        at java.net.URLClassLoader.findClass(Unknown Source)</p><p>        at java.lang.ClassLoader.loadClass(ClassLoader.java:428)</p><p>        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)</p><p>        at java.lang.ClassLoader.loadClass(ClassLoader.java:360)</p><p>        at java.lang.Class.forName0(Native Method)</p><p>        at java.lang.Class.forName(Unknown Source)</p><p>        at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseCl</p><p>assLoaderDomain.java:304)</p><p>        at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseCl</p><p>assLoaderDomain.java:1172)</p><p>        at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(Ba</p><p>seClassLoader.java:1264)</p><p>        at org.jboss.classloader.spi.base.BaseClassLoader.doLoadClass(BaseClassL</p><p>oader.java:549)</p><p>        at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoa</p><p>der.java:497)</p><p>        at java.lang.ClassLoader.loadClass(ClassLoader.java:360)</p><p>        at java.lang.Class.forName0(Native Method)</p><p>        at java.lang.Class.forName(Unknown Source)</p><p>        at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryI</p><p>mpl.resolveComplexTypeInfo(IntrospectionTypeInfoFactoryImpl.java:419)</p><p>        at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryI</p><p>mpl.getTypeInfo(IntrospectionTypeInfoFactoryImpl.java:388)</p><p>        at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactory.</p><p>getTypeInfo(IntrospectionTypeInfoFactory.java:54)</p><p>        at org.jboss.classadapter.plugins.BasicClassAdapterFactory.getClassAdapt</p><p>er(BasicClassAdapterFactory.java:61)</p><p>        at org.jboss.config.plugins.AbstractConfiguration.getBeanInfo(AbstractCo</p><p>nfiguration.java:86)</p><p>        at org.jboss.kernel.plugins.config.AbstractKernelConfig.getBeanInfo(Abst</p><p>ractKernelConfig.java:80)</p><p>        at org.jboss.kernel.plugins.config.AbstractKernelConfigurator.getBeanInf</p><p>o(AbstractKernelConfigurator.java:77)</p><p>        at org.jboss.kernel.plugins.config.AbstractKernelConfigurator.getBeanInf</p><p>o(AbstractKernelConfigurator.java:96)</p><p>        at org.jboss.kernel.plugins.dependency.PreInstallAction.installActionInt</p><p>ernal(PreInstallAction.java:90)</p><p>        at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction</p><p>(InstallsAwareAction.java:54)</p><p>        at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction</p><p>(InstallsAwareAction.java:42)</p><p>        at org.jboss.dependency.plugins.action.SimpleControllerContextAction.sim</p><p>pleInstallAction(SimpleControllerContextAction.java:62)</p><p>        at org.jboss.dependency.plugins.action.AccessControllerContextAction.ins</p><p>tall(AccessControllerContextAction.java:71)</p><p>        at org.jboss.dependency.plugins.AbstractControllerContextActions.install</p><p>(AbstractControllerContextActions.java:51)</p><p>        at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra</p><p>ctControllerContext.java:348)</p><p>        at org.jboss.dependency.plugins.AbstractController.install(AbstractContr</p><p>oller.java:1631)</p><p>        at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra</p><p>ctController.java:934)</p><p>        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr</p><p>actController.java:1082)</p><p>        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr</p><p>actController.java:984)</p><p>        at org.jboss.dependency.plugins.AbstractController.install(AbstractContr</p><p>oller.java:774)</p><p>        at org.jboss.dependency.plugins.AbstractController.install(AbstractContr</p><p>oller.java:540)</p><p>        at org.jboss.deployers.vfs.deployer.kernel.BeanMetaDataDeployer.deploy(B</p><p>eanMetaDataDeployer.java:121)</p><p>        at org.jboss.deployers.vfs.deployer.kernel.BeanMetaDataDeployer.deploy(B</p><p>eanMetaDataDeployer.java:51)</p><p>        at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.i</p><p>nternalDeploy(AbstractSimpleRealDeployer.java:62)</p><p>        at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(</p><p>AbstractRealDeployer.java:50)</p><p>        at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(Deployer</p><p>Wrapper.java:171)</p><p>        at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(Deployer</p><p>sImpl.java:1439)</p><p>        at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFi</p><p>rst(DeployersImpl.java:1157)</p><p>        at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFi</p><p>rst(DeployersImpl.java:1178)</p><p>        at org.jboss.deployers.plugins.deployers.DeployersImpl.install(Deployers</p><p>Impl.java:1098)</p><p>        at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra</p><p>ctControllerContext.java:348)</p><p>        at org.jboss.dependency.plugins.AbstractController.install(AbstractContr</p><p>oller.java:1631)</p><p>        at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra</p><p>ctController.java:934)</p><p>        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr</p><p>actController.java:1082)</p><p>        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr</p><p>actController.java:984)</p><p>        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro</p><p>ller.java:822)</p><p>        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro</p><p>ller.java:553)</p><p>        at org.jboss.deployers.plugins.deployers.DeployersImpl.process(Deployers</p><p>Impl.java:781)</p><p>        at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeploye</p><p>rImpl.java:702)</p><p>        at org.jboss.system.server.profileservice.repository.MainDeployerAdapter</p><p>.process(MainDeployerAdapter.java:117)</p><p>        at org.jboss.system.server.profileservice.repository.ProfileDeployAction</p><p>.install(ProfileDeployAction.java:70)</p><p>        at org.jboss.system.server.profileservice.repository.AbstractProfileActi</p><p>on.install(AbstractProfileAction.java:53)</p><p>        at org.jboss.system.server.profileservice.repository.AbstractProfileServ</p><p>ice.install(AbstractProfileService.java:361)</p><p>        at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra</p><p>ctControllerContext.java:348)</p><p>        at org.jboss.dependency.plugins.AbstractController.install(AbstractContr</p><p>oller.java:1631)</p><p>        at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra</p><p>ctController.java:934)</p><p>        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr</p><p>actController.java:1082)</p><p>        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr</p><p>actController.java:984)</p><p>        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro</p><p>ller.java:822)</p><p>        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro</p><p>ller.java:553)</p><p>        at org.jboss.system.server.profileservice.repository.AbstractProfileServ</p><p>ice.activateProfile(AbstractProfileService.java:306)</p><p>        at org.jboss.system.server.profileservice.ProfileServiceBootstrap.start(</p><p>ProfileServiceBootstrap.java:271)</p><p>        at org.jboss.bootstrap.AbstractServerImpl.start(AbstractServerImpl.java:</p><p>461)</p><p>        at org.jboss.Main.boot(Main.java:221)</p><p>        at org.jboss.Main$1.run(Main.java:556)</p><p><span style="color: #000000;"><br/></span></p><p>DEPLOYMENTS MISSING DEPENDENCIES:</p><p>  Deployment "CB1" is missing the following dependencies:</p><p>    Dependency "CustomCL" (should be in state "PreInstall", but is actually in s</p><p>tate "**ERROR**")</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>DEPLOYMENTS IN ERROR:</p><p>  Deployment "CustomCL" is in error due to the following reason(s): java.lang.Cl</p><p>assNotFoundException: com.beans.CustomClassLoader, **ERROR**</p><p><span style="color: #000000;"><br/></span></p><p><span style="color: #000000;"><br/></span></p><p>Can anyone help in solving this problem. </p><p>From the above error, it seems that the baseClassLoader doesn't know where com.beans.CustomClassLoader is located. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks in advance,</p><p>Irfan</p></div>
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