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From "John Sisson (JIRA)" <...@geronimo.apache.org>
Subject [jira] Updated: (GERONIMO-2222) Application errors in static initialization blocks during serialization of configuration during deployment due to incorrect TCCL
Date Tue, 25 Jul 2006 05:43:14 GMT
     [ http://issues.apache.org/jira/browse/GERONIMO-2222?page=all ]

John Sisson updated GERONIMO-2222:
----------------------------------

    Attachment: jira-g-2222-xerces-test.zip

Attached test application that demonstrates Xerces problem when TCCL is not correctly set
during deployment.  Need to build using m2 (mvn install) and use deploy script in root directory.

> Application errors in static initialization blocks during serialization of configuration
during deployment  due to incorrect TCCL
> ---------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: GERONIMO-2222
>                 URL: http://issues.apache.org/jira/browse/GERONIMO-2222
>             Project: Geronimo
>          Issue Type: Bug
>      Security Level: public(Regular issues) 
>          Components: deployment
>    Affects Versions: 1.1, 1.0
>            Reporter: John Sisson
>         Assigned To: John Sisson
>            Priority: Blocker
>             Fix For: 1.1.1
>
>         Attachments: GERONIMO-2222-v1.patch, jira-g-2222-xerces-test.zip, jira-g-2222.zip
>
>
> h1. Problem
> Exceptions and/or errors may occur in static initialization blocks invoked whilst loading
classes when serializing a configuration during deployment.  
> These same exceptions/errors don't occur when starting the configuration.
> h1. Symptoms
> Deployment of an EAR that has dependencies on its own copy of Xerces will cause an exception
similar to the following if Xerces is initialised in a static block.
> {code}
> java.lang.ClassCastException
>         at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
>         at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
>         at com.foo.server.ejb.MyEJB.<clinit>
>         at java.io.ObjectStreamClass.hasStaticInitializer(Native Method)
>         at java.io.ObjectStreamClass.computeDefaultSUID(ObjectStreamClass.java:1557)
>         at java.io.ObjectStreamClass.access$100(ObjectStreamClass.java:47)
>         at java.io.ObjectStreamClass$1.run(ObjectStreamClass.java:173)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.io.ObjectStreamClass.getSerialVersionUID(ObjectStreamClass.java:170)
>         at java.io.ObjectStreamClass.writeNonProxy(ObjectStreamClass.java:557)
>         at java.io.ObjectOutputStream.writeClassDescriptor(ObjectOutputStream.java:591)
>         at java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1142)
>         at java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1100)
>         at java.io.ObjectOutputStream.writeClass(ObjectOutputStream.java:1082)
>         at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:996)
>         at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
>         at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
>         at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
>         at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
>         at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
>         at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
>         at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
>         at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
>         at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
>         at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
>         at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
>         at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
>         at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
>         at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
>         at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
>         at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
>         at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
>         at org.apache.geronimo.gbean.GBeanData.writeExternal(GBeanData.java:187)
>         at org.apache.geronimo.kernel.config.SerializedGBeanState.storeGBeans(SerializedGBeanState.java:139)
>         at org.apache.geronimo.kernel.config.SerializedGBeanState.writeObject(SerializedGBeanState.java:92)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:324)
>         at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:809)
>         at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1296)
>         at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
>         at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
>         at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
>         at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
>         at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
>         at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
>         at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
>         at org.apache.geronimo.kernel.config.SerializedConfigurationMarshaler.writeConfigurationData(SerializedConfigurationMarshale
> r.java:66)
>         at org.apache.geronimo.kernel.config.ConfigurationUtil.writeConfigurationData(ConfigurationUtil.java:163)
>         at org.apache.geronimo.system.configuration.ExecutableConfigurationUtil.writeConfiguration(ExecutableConfigurationUtil.java:
> 155)
>         at org.apache.geronimo.system.configuration.RepositoryConfigurationStore.install(RepositoryConfigurationStore.java:323)
>         at org.apache.geronimo.deployment.Deployer.deploy(Deployer.java:322)
>         at org.apache.geronimo.deployment.Deployer.deploy(Deployer.java:124)
> {code}
> Deployment of an EAR that has dependencies on its own copy of Log4j will cause errors
similar to the following if Log4j is initialised in a static block.
> {code}
> log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender"
variable.
> log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> log4j:ERROR [[org.apache.geronimo.kernel.classloader.JarFileClassLoader id=groupId/artifactId/1.0/ear]]
whereas object of type
> log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by [sun.misc.Launcher$AppClassLoader@53ba3d].
> log4j:ERROR Could not instantiate appender named "WSSysOut".
> log4j: Parsing appender named "WSFile1".
> log4j:ERROR A "org.apache.log4j.RollingFileAppender" object is not assignable to a "org.apache.log4j.Appender"
variable.
> log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
> log4j:ERROR [[org.apache.geronimo.kernel.classloader.JarFileClassLoader id=groupId/artifactId/1.0/ear]]
whereas object of type
> log4j:ERROR "org.apache.log4j.RollingFileAppender" was loaded by [sun.misc.Launcher$AppClassLoader@53ba3d].
> log4j:ERROR Could not instantiate appender named "WSFile1".
> {code}
> h1. Cause
> The org.apache.geronimo.deployment.deploy(..) method at approx line 187 serializes the
configuration by calling store.install(configurationData) but at the time when the configuration
is serialized (and static blocks in EJBs invoked) the thread context classloader is set to
[org.apache.geronimo.kernel.classloader.JarFileClassLoader id=geronimo/j2ee-security/1.1.1-SNAPSHOT/car].
> Xerces and Log4j are examples of libraries that rely upon the thread context classloader
to be set correctly during initialization.
> h1. Solution
> Set the context classloader before serializing the configuration.
> h1. Workaround
> If you have access to the application source code, modify the application's static blocks
to call setContextClassLoader(..).  For example:
> {code}
> ClassLoader oldClassloader = Thread.currentThread().getContextClassLoader();
> Thread.currentThread().setContextClassLoader( this.getClass().getClassLoader());
> try {
>    // application processing
> } finally {
>     Thread.currentThread().setContextClassLoader( oldClassloader );
> }
> {code}
> Alternatively for Log4j problems (Log4j 1.2.6 or later) you could try setting log4j.ignoreTCL=true.

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