Postgres is throwing PSQLExceptions, but Teiid is logging them as warning. The problem is the error isn't being returned to the client. The app continues to run with no knowledge of all the errors on the server. Here's an example of the server error:

09:50:35,349 WARN [org.teiid.CONNECTOR] (Worker6_QueryProcessorQueue12168) Connector worker process failed for atomic-request=Pn2BUCkOYts6.0.9.4084: org.teiid.translator.jdbc.JDBCExecutionException: 0 TEIID11013:TEIID11004 Error executing statement(s): [Prepared Values: [267, 2625077, 27, -280251] SQL: INSERT INTO "public"."history" ("tid", "bid", "aid", "delta") VALUES (?, ?, ?, ?)]
at org.teiid.translator.jdbc.JDBCUpdateExecution.executeTranslatedCommand(JDBCUpdateExecution.java:242)
at org.teiid.translator.jdbc.JDBCUpdateExecution.execute(JDBCUpdateExecution.java:76)
at org.teiid.dqp.internal.datamgr.ConnectorWorkItem$1.execute(ConnectorWorkItem.java:345) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.execute(ConnectorWorkItem.java:312) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.DataTierTupleSource.getResults(DataTierTupleSource.java:301) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.DataTierTupleSource.nextTuple(DataTierTupleSource.java:138) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.relational.AccessNode.nextBatchDirect(AccessNode.java:306) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:278) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.relational.RelationalPlan.nextBatch(RelationalPlan.java:149) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.QueryProcessor.nextBatchDirect(QueryProcessor.java:149) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.QueryProcessor.nextBatch(QueryProcessor.java:112) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.BatchIterator.finalRow(BatchIterator.java:69) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.common.buffer.AbstractTupleSource.getCurrentTuple(AbstractTupleSource.java:70) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.BatchIterator.getCurrentTuple(BatchIterator.java:84) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.common.buffer.AbstractTupleSource.hasNext(AbstractTupleSource.java:92) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.proc.ProcedurePlan.executePlan(ProcedurePlan.java:563) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.proc.CreateCursorResultSetInstruction.process(CreateCursorResultSetInstruction.java:68) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.proc.ProcedurePlan.processProcedure(ProcedurePlan.java:356) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.proc.ProcedurePlan.nextBatchDirect(ProcedurePlan.java:283) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.proc.ProcedurePlan.nextBatch(ProcedurePlan.java:257) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.relational.PlanExecutionNode.nextBatchDirect(PlanExecutionNode.java:118) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:278) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.relational.ProjectNode.nextBatchDirect(ProjectNode.java:146) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.relational.RelationalNode.nextBatch(RelationalNode.java:278) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.relational.RelationalPlan.nextBatch(RelationalPlan.java:149) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.QueryProcessor.nextBatchDirect(QueryProcessor.java:149) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.QueryProcessor.nextBatch(QueryProcessor.java:112) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:157) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:139) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.RequestWorkItem.processMore(RequestWorkItem.java:435) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:320) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:51) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:248) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:269) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:214) [teiid-engine-8.4.1-redhat-7.jar:8.4.1-redhat-7]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_13]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_13]
at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_13]
Caused by: org.postgresql.util.PSQLException: ERROR: insert or update on table "history" violates foreign key constraint "history_bid_fkey"
Detail: Key (bid)=(2625077) is not present in table "branches".
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:334)
at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:493)
at org.teiid.translator.jdbc.JDBCUpdateExecution.executeTranslatedCommand(JDBCUpdateExecution.java:213)
... 38 more