[jboss-jira] [JBoss JIRA] (WFLY-12031) Memory leak in wildfly transaction client

[Joachim Petrich (Jira)]

Joachim Petrich created WFLY-12031:
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             Summary: Memory leak in wildfly transaction client
                 Key: WFLY-12031
                 URL: https://issues.jboss.org/browse/WFLY-12031
             Project: WildFly
          Issue Type: Bug
          Components: Transactions
    Affects Versions: 15.0.1.Final
         Environment: wildfly-transaction-client-1.1.3.Final
wildfly.15.0.1.Final
Window 10
            Reporter: Joachim Petrich
            Assignee: Thomas Jenkinson


After a volume run of our system we recognized millions of entries in the openFilePaths Object of class FileSystemXAResourceRegistry. When enabling traces for org.wildfly.transaction it seems that for adding an entry a xid string is used
        XAResourceRegistryFile(Xid xid) throws SystemException {
            xaRecoveryPath.toFile().mkdir(); // create dir if non existent
            final String xidString = SimpleXid.of(xid).toHexString('_');
            this.filePath = xaRecoveryPath.resolve(xidString);
            openFilePaths.add(*xidString*);

and for removing the entire file path
        protected void removeResource(XAResource resource) throws XAException {
            if (resources.remove(resource)) {
                if (resources.isEmpty()) {
                    // delete file
                    try {
                        if (fileChannel != null) {
                            fileChannel.close();
                        }
                        Files.delete(filePath);
                        // deleting using the filepath as key caused a memory leak,
                        // if xid string have been added, therefore build the xid string for removing
                        openFilePaths.remove(*filePath.toString()*);
  
We didn't find any code where this xid are cleaned up.
As workaround we additionally extract the xid String from the file path and remove the corresponding entry.

                        String xidString = filePath.toString().substring(filePath.toString().indexOf(
                        		xaRecoveryPath.toString()) + xaRecoveryPath.toString().length() + 1);
                        openFilePaths.remove(xidString);




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