I've enabled the TRACE debug level for org.jboss.modules and here's what I've found out so far:
- When the startup succeeds, the javax.rmi.CORBA.Stub is loaded and defined from the javax.rmi.api module. Then the server attempts to load the com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl class from the same module. It shows that this class can't be loaded from this module but the server goes on and starts correctly. No other entries involving this class are found:
18:30:17,470 TRACE [org.jboss.modules] (MSC service thread 1-14) Finding class javax.rmi.CORBA.Stub from Module "org.jacorb:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:30:17,470 TRACE [org.jboss.modules] (MSC service thread 1-14) Finding local class javax.rmi.CORBA.Stub from Module "javax.rmi.api:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:30:17,470 TRACE [org.jboss.modules] (MSC service thread 1-14) Loading class javax.rmi.CORBA.Stub locally from Module "javax.rmi.api:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:30:17,471 TRACE [org.jboss.modules] (MSC service thread 1-14) Attempting to define class javax.rmi.CORBA.Stub in Module "javax.rmi.api:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
...
18:30:17,472 TRACE [org.jboss.modules] (MSC service thread 1-14) Defined class javax.rmi.CORBA.Stub in Module "javax.rmi.api:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
...
18:30:17,485 TRACE [org.jboss.modules] (MSC service thread 1-14) Finding class com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl from Module "javax.rmi.api:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:30:17,485 TRACE [org.jboss.modules] (MSC service thread 1-14) Class com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl not found from Module "javax.rmi.api:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
- When the startup fails, javax.rmi.CORBA.Stub is loaded just like shown before, but when the server attempts to load the StubDelegateImpl, two modules are involved: javax.rmi.api and org.jboss.as.standalone. After that, the logs show that org.jboss.as.standalone attempts to load javax.rmi.CORBA.Stub, which ultimately loads the JDK version of the class we see in the exception.
18:25:04,039 TRACE [org.jboss.modules] (MSC service thread 1-1) Finding class com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl from Module "javax.rmi.api:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:25:04,039 TRACE [org.jboss.modules] (MSC service thread 1-1) Class com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl not found from Module "javax.rmi.api:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:25:04,040 TRACE [org.jboss.modules] (MSC service thread 1-1) Finding class com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl from Module "org.jboss.as.standalone:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:25:04,040 TRACE [org.jboss.modules] (MSC service thread 1-1) Class com.sun.corba.se.impl.javax.rmi.CORBA.StubDelegateImpl not found from Module "org.jboss.as.standalone:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
...
18:25:04,043 TRACE [org.jboss.modules] (MSC service thread 1-1) Finding class javax.rmi.CORBA.Stub from Module "org.jboss.as.standalone:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:25:04,043 TRACE [org.jboss.modules] (MSC service thread 1-1) Class javax.rmi.CORBA.Stub not found from Module "org.jboss.as.standalone:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
In this case, the org.jboss.as.standalone module attempts to load the class right after the javax.rmi.api module fails to do so and this messes up everything. I even found the following entry:
18:25:04,046 TRACE [org.jboss.modules] (MSC service thread 1-1) Finding class org.jboss.as.iiop.service.CorbaNamingService from Module "org.jboss.as.standalone:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
18:25:04,046 TRACE [org.jboss.modules] (MSC service thread 1-1) Class org.jboss.as.iiop.service.CorbaNamingService not found from Module "org.jboss.as.standalone:main" from local module loader @6b86768e (roots: /home/sguilhen/Workspace/workspace-jboss/jboss-as/build/target/jboss-7.0.0.Beta4-SNAPSHOT/modules)
For some reason, org.jboss.as.standalone is attempting to load the CorbaNamingService class which should be visible to the org.jboss.as.iiop module only.