ulwx opened a new issue, #24331:
URL: https://github.com/apache/shardingsphere/issues/24331
```
GlobalTransaction globalTransaction =
GlobalTransactionContext.getCurrentOrCreate();
globalTransaction.begin(timeout * 1000);
TransactionTypeHolder.set(TransactionType.BASE);
try{
doInsert();
}finally {
TransactionTypeHolder.clear();
}
globalTransaction.commit();
```
上述代码运行时，doInsert()会抛出null异常，是doInsert()里的commit()方法抛出的，原因是shardingjdbc代理commit()方法时，由于SeataATShardingSphereTransactionManager#begin()方法因为外围存在GlobalTransaction而一直没有执行，导致TransactionTypeHolder#set()没有执行，一直为空，从而在shardingjdbc代理commit()方法执行时通过TransactionTypeHolder#get()查询为空，报null指针异常
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