Appears to still be an issue similar to TEIID 2537. Executing against the invokeHttp() procedure generated by JBDS 5 for Teiid Designer 7.7.3 without a stream parameter results in a slightly different stack trace, but appears to be the same issue.

2016-01-21 12:53:50,297 ERROR [org.teiid.PROCESSOR] (Worker22_QueryProcessorQueue117472) TEIID30019 Unexpected exception for request FzkQneotrSUs.5: java.lang.NullPointerException
at org.teiid.translator.ws.BinaryWSProcedureExecution.getOutputParameterValues(BinaryWSProcedureExecution.java:174)
at org.teiid.dqp.internal.datamgr.ProcedureBatchHandler.getParameterRow(ProcedureBatchHandler.java:86) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.handleBatch(ConnectorWorkItem.java:435) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.more(ConnectorWorkItem.java:207) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at org.teiid.dqp.internal.process.DataTierTupleSource.getResults(DataTierTupleSource.java:301) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:110) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:107) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [rt.jar:1.8.0_65]
at org.teiid.dqp.internal.process.FutureWork.run(FutureWork.java:58) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:274) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210) [teiid-engine-8.7.2.6_2-redhat-1.jar:8.7.2.6_2-redhat-1]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_65]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_65]