I'm getting an NPE, as tx is null at org.infinispan.transaction.TransactionTable.failureCompletingTransaction(Transaction tx)

being invoked from org.infinispan.transaction.TransactionCoordinator.rollback(LocalTransaction)
which has this code:

LocalTxInvocationContext ctx = icc.createTxInvocationContext();
      ctx.setLocalTransaction(localTransaction);
      try {
         invoker.invoke(ctx, rollbackCommand);
         txTable.removeLocalTransaction(localTransaction);
      } catch (Throwable e) {
         txTable.failureCompletingTransaction(ctx.getTransaction());
         log.errorRollingBack(e);
         throw new XAException(XAException.XA_HEURHAZ);
      } finally {
         icc.suspend();
      }

you cant see that a localtransaction is set on the context, but then ctx.getTransaction() is passed to the failing method. This variable was unset.

so basically I debugged it already but I'm not sure how this should be solved.

This is currently reproducible by running org.infinispan.lock.APITest (as it fails for some other reason)