[jboss-jira] [JBoss JIRA] (WFCORE-561) Class loading problem with XAResource and XADataSource

[David Lloyd (JIRA)]

David Lloyd created WFCORE-561:
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             Summary: Class loading problem with XAResource and XADataSource
                 Key: WFCORE-561
                 URL: https://issues.jboss.org/browse/WFCORE-561
             Project: WildFly Core
          Issue Type: Bug
          Components: Modules
            Reporter: David Lloyd
            Assignee: David Lloyd
             Fix For: 1.0.0.Alpha19


We define the JTA API in a module ({{java.transaction.api}}) but we neglect to redefine those classes in the {{javax.sql}} package which reference that API, including {{XADataSource}}, which can cause {{LinkageError}}s and strange CCEs under certain circumstances.

The isolated subgraph of classes from that package need to be added to either the {{java.transaction.api}} module or a new {{javax.sql.api}} module.  Then measures must be taken to prevent the JDK's version of these classes from leaking out, a task complicated by the presence of the rowset API classes also sharing that package.

One solution is to ensure that the {{jdk.api}} module includes a re-exported dependency on the module with the relocated classes which takes precedence over the system dependency, ensuring that the system classes never become visible.  Another solution is to modify JBoss Modules to implement an XML mapping of the class filter concept, and then add class filter expressions to the {{module.xml}} of the {{jdk.api}} module.



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