[JBoss Microcontainer] - Re: Custom ClassLoader
by Irfan Basha
Irfan Basha [https://community.jboss.org/people/irbash] created the discussion
"Re: Custom ClassLoader"
To view the discussion, visit: https://community.jboss.org/message/804847#804847
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Solution:
1. Add jboss-beans.xml to WEB-INF:
+<deployment xmlns="urn:jboss:bean-deployer:2.0">+
+ + +<classloader name="custom-classloader" xmlns="urn:jboss:classloader:1.0"+
+ export-all="NON_EMPTY" import-all="true" />+
+ <bean name="CustomCL" class="com.beans.CustomClassLoader">+
+ <constructor>+
+ <parameter>+
+ <inject bean="custom-classloader:0.0.0" />+
+ </parameter>+
+ </constructor>+
+ </bean>+
+ <bean name="CB1" class="com.Sample">+
+ <classloader>+
+ <inject bean="CustomCL" />+
+ </classloader>+
+</bean>+
+</deployment>+
+
+
2. Create a CustomClassLoader (com.beans.CustomClassLoader):
public class CustomClassLoader extends ClassLoader
{
public CustomClassLoader(ClassLoader parent)
{
super(parent);
}
public Class<?> loadClass(String name) throws ClassNotFoundException
{
//This simply calls super's loadClass (if run from jboss, it calls BaseClassLoader
return super.loadClass(name);
}
}
Run JBoss, keep a breakpoint in CustomClassLoader.loadClass method. when class com.Sample has to be loaded the breakpoint will be hit.
Regards,
Irfan
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[JBoss Microcontainer] - Custom ClassLoader
by Irfan Basha
Irfan Basha [https://community.jboss.org/people/irbash] created the discussion
"Custom ClassLoader"
To view the discussion, visit: https://community.jboss.org/message/804773#804773
--------------------------------------------------------------
Hi All,
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).
I found this article which explains how a custom classloader can be created:
(Custom ClassLoader (classloader-beans.xml)) http://java.dzone.com/articles/a-look-inside-jboss-microconta-0 http://java.dzone.com/articles/a-look-inside-jboss-microconta-0
I have few clarifications in this:
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)
2) Correct me if am wrong: The bean CB2 will be loaded using the customClassLoader... right ?
This is how my jboss-beans.xml looks like:
+<deployment xmlns="urn:jboss:bean-deployer:2.0">+
+ <classloader>+
+ <inject bean="custom-classloader:0.0.0" />+
+ </classloader>+
+ <classloader name="custom-classloader" xmlns="urn:jboss:classloader:1.0"+
+ export-all="NON_EMPTY" import-all="true" />+
+ <bean name="CustomCL" class="com.beans.CustomClassLoader">+
+ <constructor>+
+ <parameter>+
+ <inject bean="custom-classloader:0.0.0" />+
+ </parameter>+
+ </constructor>+
+ </bean>+
+ <bean name="CB1" class="com.Sample">+
+ <classloader>+
+ <inject bean="CustomCL" />+
+ </classloader>+
+</bean>+
+</deployment>+
And I have the class CustomeClassLoader which just extends ClassLoader:
public class CustomClassLoader extends ClassLoader
{
private Pattern pattern;
public CustomClassLoader(ClassLoader parent)
{
super(parent);
}
public Class<?> loadClass(String name) throws ClassNotFoundException
{
if (pattern == null || pattern.matcher(name).matches())
return super.loadClass(name);
else
throw new ClassNotFoundException("Name '" + name + "' doesn't match pattern: " + pattern);
}
public void setPattern(String regexp)
{
pattern = Pattern.compile(regexp);
}
}
and when I start JBoss I get this following error:
08:28:51,677 ERROR [AbstractKernelController] Error installing to PreInstall: na
me=CustomCL state=Real
java.lang.ClassNotFoundException: com.beans.CustomClassLoader
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(ClassLoader.java:428)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(ClassLoader.java:360)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseCl
assLoaderDomain.java:304)
at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseCl
assLoaderDomain.java:1172)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(Ba
seClassLoader.java:1264)
at org.jboss.classloader.spi.base.BaseClassLoader.doLoadClass(BaseClassL
oader.java:549)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoa
der.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:360)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryI
mpl.resolveComplexTypeInfo(IntrospectionTypeInfoFactoryImpl.java:419)
at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryI
mpl.getTypeInfo(IntrospectionTypeInfoFactoryImpl.java:388)
at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactory.
getTypeInfo(IntrospectionTypeInfoFactory.java:54)
at org.jboss.classadapter.plugins.BasicClassAdapterFactory.getClassAdapt
er(BasicClassAdapterFactory.java:61)
at org.jboss.config.plugins.AbstractConfiguration.getBeanInfo(AbstractCo
nfiguration.java:86)
at org.jboss.kernel.plugins.config.AbstractKernelConfig.getBeanInfo(Abst
ractKernelConfig.java:80)
at org.jboss.kernel.plugins.config.AbstractKernelConfigurator.getBeanInf
o(AbstractKernelConfigurator.java:77)
at org.jboss.kernel.plugins.config.AbstractKernelConfigurator.getBeanInf
o(AbstractKernelConfigurator.java:96)
at org.jboss.kernel.plugins.dependency.PreInstallAction.installActionInt
ernal(PreInstallAction.java:90)
at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction
(InstallsAwareAction.java:54)
at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction
(InstallsAwareAction.java:42)
at org.jboss.dependency.plugins.action.SimpleControllerContextAction.sim
pleInstallAction(SimpleControllerContextAction.java:62)
at org.jboss.dependency.plugins.action.AccessControllerContextAction.ins
tall(AccessControllerContextAction.java:71)
at org.jboss.dependency.plugins.AbstractControllerContextActions.install
(AbstractControllerContextActions.java:51)
at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra
ctControllerContext.java:348)
at org.jboss.dependency.plugins.AbstractController.install(AbstractContr
oller.java:1631)
at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra
ctController.java:934)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1082)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:984)
at org.jboss.dependency.plugins.AbstractController.install(AbstractContr
oller.java:774)
at org.jboss.dependency.plugins.AbstractController.install(AbstractContr
oller.java:540)
at org.jboss.deployers.vfs.deployer.kernel.BeanMetaDataDeployer.deploy(B
eanMetaDataDeployer.java:121)
at org.jboss.deployers.vfs.deployer.kernel.BeanMetaDataDeployer.deploy(B
eanMetaDataDeployer.java:51)
at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.i
nternalDeploy(AbstractSimpleRealDeployer.java:62)
at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(
AbstractRealDeployer.java:50)
at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(Deployer
Wrapper.java:171)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(Deployer
sImpl.java:1439)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFi
rst(DeployersImpl.java:1157)
at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFi
rst(DeployersImpl.java:1178)
at org.jboss.deployers.plugins.deployers.DeployersImpl.install(Deployers
Impl.java:1098)
at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra
ctControllerContext.java:348)
at org.jboss.dependency.plugins.AbstractController.install(AbstractContr
oller.java:1631)
at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra
ctController.java:934)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1082)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:984)
at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:822)
at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:553)
at org.jboss.deployers.plugins.deployers.DeployersImpl.process(Deployers
Impl.java:781)
at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeploye
rImpl.java:702)
at org.jboss.system.server.profileservice.repository.MainDeployerAdapter
.process(MainDeployerAdapter.java:117)
at org.jboss.system.server.profileservice.repository.ProfileDeployAction
.install(ProfileDeployAction.java:70)
at org.jboss.system.server.profileservice.repository.AbstractProfileActi
on.install(AbstractProfileAction.java:53)
at org.jboss.system.server.profileservice.repository.AbstractProfileServ
ice.install(AbstractProfileService.java:361)
at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra
ctControllerContext.java:348)
at org.jboss.dependency.plugins.AbstractController.install(AbstractContr
oller.java:1631)
at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra
ctController.java:934)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1082)
at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:984)
at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:822)
at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:553)
at org.jboss.system.server.profileservice.repository.AbstractProfileServ
ice.activateProfile(AbstractProfileService.java:306)
at org.jboss.system.server.profileservice.ProfileServiceBootstrap.start(
ProfileServiceBootstrap.java:271)
at org.jboss.bootstrap.AbstractServerImpl.start(AbstractServerImpl.java:
461)
at org.jboss.Main.boot(Main.java:221)
at org.jboss.Main$1.run(Main.java:556)
DEPLOYMENTS MISSING DEPENDENCIES:
Deployment "CB1" is missing the following dependencies:
Dependency "CustomCL" (should be in state "PreInstall", but is actually in s
tate "**ERROR**")
DEPLOYMENTS IN ERROR:
Deployment "CustomCL" is in error due to the following reason(s): java.lang.Cl
assNotFoundException: com.beans.CustomClassLoader, **ERROR**
Can anyone help in solving this problem.
>From the above error, it seems that the baseClassLoader doesn't know where com.beans.CustomClassLoader is located.
Thanks in advance,
Irfan
--------------------------------------------------------------
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13 years