[GitHub] [shardingsphere] lwclover opened a new issue #13730: JDBCBackendDataSource.createConnection may occurs NullPointException when changing datasource metadata

[GitBox <gi...@apache.org>]

lwclover opened a new issue #13730:
URL: https://github.com/apache/shardingsphere/issues/13730


   Before report a bug, make sure you have:
   
   NullPointException occurs when changing datasource metadata and executing sql at sametime.
   
   ```
       private Connection createConnection(final String schemaName, final String dataSourceName, final DataSource dataSource, final TransactionType transactionType) throws SQLException {
           ShardingSphereTransactionManager transactionManager
                   = ProxyContext.getInstance().getContextManager().getTransactionContexts().getEngines().get(schemaName).getTransactionManager(transactionType);
           return isInTransaction(transactionManager) ? transactionManager.getConnection(dataSourceName) : dataSource.getConnection();
       }
   ```
   ```
       private void renewTransactionContext(final String schemaName, final ShardingSphereResource resource) {
           closeTransactionEngine(schemaName);
           transactionContexts.getEngines().put(schemaName, createNewEngine(resource.getDatabaseType(), resource.getDataSources()));
       }
       private void closeTransactionEngine(final String schemaName) {
           ShardingSphereTransactionManagerEngine staleEngine = transactionContexts.getEngines().remove(schemaName);
           if (null != staleEngine) {
               try {
                   staleEngine.close();
                   // CHECKSTYLE:OFF
               } catch (final Exception ex) {
                   // CHECKSTYLE:ON
                   log.error("Close transaction engine failed", ex);
               }
           }
       }
   ```


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[GitHub] [shardingsphere] menghaoranss closed issue #13730: JDBCBackendDataSource.createConnection occurs NullPointException when changing datasource metadata

[GitBox <gi...@apache.org>]

menghaoranss closed issue #13730:
URL: https://github.com/apache/shardingsphere/issues/13730


   


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