Zze0 opened a new issue #4002: Transactions cannot be rolled back properly when using local transaction. URL: https://github.com/apache/incubator-shardingsphere/issues/4002 ## Bug Report **For English only**, other languages will not accept. Before report a bug, make sure you have: - Searched open and closed [GitHub issues](https://github.com/apache/incubator-shardingsphere/issues). - Read documentation: [ShardingSphere Doc](https://shardingsphere.apache.org/document/current/en/overview). Please pay attention on issues you submitted, because we maybe need more details. If no response **more than 7 days** and we cannot reproduce it on current information, we will **close it**. Please answer these questions before submitting your issue. Thanks! ### Which version of ShardingSphere did you use? 4.0.0-RC2 ### Which project did you use? Sharding-JDBC or Sharding-Proxy? Sharding-JDBC ### Expected behavior https://shardingsphere.apache.org/document/current/en/features/transaction/function/local-transaction/  ### Actual behavior 1, The insert is committed directly. 2, Local transaction cannot be rolled back after a null pointer exception is thrown. Example code:  ### Reason analyze (If you can) Distributed transactions are enabled after the sharding-transaction-xa-core package is imported into the project. The reason for the insert is directly committed is probably because the autoCommit property of the ShardingConnection class defaults to true and then returns false in the isHoldTransaction function of the ShardingConnection class. ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc. Please see the sample code below. ### Example codes for reproduce this issue (such as a github link). https://github.com/Zze0/demo-sharding-jdbc
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