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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