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Jark Wu commented on FLINK-16924: --------------------------------- I think it's hard to throw a proper exception for multithreads. But we can add a description on {{TableEnvironment}} that it is not thread-safe. Hi [~Terry1897], is it possible to hold an independent TableEnv instance for each thread? > TableEnvironment#sqlUpdate throw NPE when called in async thread > ---------------------------------------------------------------- > > Key: FLINK-16924 > URL: https://issues.apache.org/jira/browse/FLINK-16924 > Project: Flink > Issue Type: Bug > Components: Table SQL / Planner > Affects Versions: 1.11.0 > Reporter: Terry Wang > Priority: Major > Attachments: 7871C046-4D67-49C8-AC8A-A4030A7981CC.png > > > Now in the latest code of flink master branch, we encountered unexpected npe > exception as the picture like attachments. > It seems that I can reproduce this problem by creating tableEnv and doing > some operations in main thread and then calling sqlQuery or sqlUpdate in > another async thread. -- This message was sent by Atlassian Jira (v8.3.4#803005)