bugfix: TM rollback fail throw the seata exception, rollback retrying throw NPE

[wangliang181230]

Ⅰ. Describe what this PR did

BUG描述：

1、TM在往TC发起回滚请求时，如果连接TC超时了，会向外抛出超时异常，但实际上需要往外抛的是业务异常。
2、TM在往TC发起回滚请求时，RM端回滚失败导致全局事务进入RollbackRetrying状态时，触发了空指针异常。

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #2760 into develop will increase coverage by 0.12%.
The diff coverage is 22.22%.

@@              Coverage Diff              @@
##             develop    #2760      +/-   ##
=============================================
+ Coverage      50.05%   50.17%   +0.12%     
  Complexity      2949     2949              
=============================================
  Files            588      588              
  Lines          18907    18931      +24     
  Branches        2241     2284      +43     
=============================================
+ Hits            9463     9498      +35     
- Misses          8478     8489      +11     
+ Partials         966      944      -22     

Impacted Files	Coverage Δ	Complexity Δ
...ing/annotation/GlobalTransactionalInterceptor.java	24.40% <0.00%> (ø)	7.00 <0.00> (ø)
...in/java/io/seata/tm/api/TransactionalTemplate.java	64.34% <33.33%> (+0.31%)	25.00 <2.00> (ø)
...ava/io/seata/tm/api/DefaultFailureHandlerImpl.java	68.57% <50.00%> (ø)	6.00 <1.00> (ø)
...o/seata/server/storage/redis/lock/RedisLocker.java	37.96% <0.00%> (-0.72%)	10.00% <0.00%> (ø%)
...in/java/io/seata/server/session/GlobalSession.java	83.71% <0.00%> (-0.55%)	71.00% <0.00%> (ø%)
...rage/redis/store/RedisTransactionStoreManager.java	36.05% <0.00%> (-0.53%)	20.00% <0.00%> (ø%)
...a/io/seata/core/rpc/netty/AbstractRpcRemoting.java	12.50% <0.00%> (-0.30%)	5.00% <0.00%> (ø%)
...java/io/seata/spring/tcc/TccActionInterceptor.java	11.36% <0.00%> (-0.27%)	2.00% <0.00%> (ø%)
...n/java/io/seata/rm/datasource/ConnectionProxy.java	28.00% <0.00%> (-0.23%)	13.00% <0.00%> (ø%)
...in/java/io/seata/server/session/BranchSession.java	78.10% <0.00%> (+0.07%)	44.00% <0.00%> (ø%)
... and 23 more

[funky-eyes]

only TCC have the issue of appeal?

[wangliang181230]

only TCC have the issue of appeal?

目前我测的是TCC会触发此BUG。其他事务模式还不确定。
不过BUG存在的依据：
io.seata.tm.api.TransactionalTemplate
168行: throw new TransactionalExecutor.ExecutionException(tx, GlobalStatus.RollbackRetrying.equals(tx.getLocalStatus()) ? TransactionalExecutor.Code.RollbackRetrying : TransactionalExecutor.Code.RollbackDone, ex);

[funky-eyes]

only TCC have the issue of appeal?

目前我测的是TCC会触发此BUG。其他事务模式还不确定。
不过BUG存在的依据：
io.seata.tm.api.TransactionalTemplate
168行: throw new TransactionalExecutor.ExecutionException(tx, GlobalStatus.RollbackRetrying.equals(tx.getLocalStatus()) ? TransactionalExecutor.Code.RollbackRetrying : TransactionalExecutor.Code.RollbackDone, ex);

能否提供复现流程,以及如果更改后对AT是否会有影响需要一个测试

[wangliang181230]

only TCC have the issue of appeal?

目前我测的是TCC会触发此BUG。其他事务模式还不确定。
不过BUG存在的依据：
io.seata.tm.api.TransactionalTemplate
168行: throw new TransactionalExecutor.ExecutionException(tx, GlobalStatus.RollbackRetrying.equals(tx.getLocalStatus()) ? TransactionalExecutor.Code.RollbackRetrying : TransactionalExecutor.Code.RollbackDone, ex);

能否提供复现流程,以及如果更改后对AT是否会有影响需要一个测试

我检索过源码，这行代码必定会抛空指针异常。TransactionalExecutor.Code为RollbackRetrying时，只写入了originalException，并没有写入cause。
所以，这个已经不是哪种分支事务会触发它的问题，而是它就是个BUG。

[funky-eyes]

only TCC have the issue of appeal?

目前我测的是TCC会触发此BUG。其他事务模式还不确定。
不过BUG存在的依据：
io.seata.tm.api.TransactionalTemplate
168行: throw new TransactionalExecutor.ExecutionException(tx, GlobalStatus.RollbackRetrying.equals(tx.getLocalStatus()) ? TransactionalExecutor.Code.RollbackRetrying : TransactionalExecutor.Code.RollbackDone, ex);

能否提供复现流程,以及如果更改后对AT是否会有影响需要一个测试

我检索过源码，这行代码必定会抛空指针异常。TransactionalExecutor.Code为RollbackRetrying时，只写入了originalException，并没有写入cause。
所以，这个已经不是哪种分支事务会触发它的问题，而是它就是个BUG。

ok,我稍后测试下这个异常.

[wangliang181230]

only TCC have the issue of appeal?

目前我测的是TCC会触发此BUG。其他事务模式还不确定。
不过BUG存在的依据：
io.seata.tm.api.TransactionalTemplate
168行: throw new TransactionalExecutor.ExecutionException(tx, GlobalStatus.RollbackRetrying.equals(tx.getLocalStatus()) ? TransactionalExecutor.Code.RollbackRetrying : TransactionalExecutor.Code.RollbackDone, ex);

能否提供复现流程,以及如果更改后对AT是否会有影响需要一个测试

复现是当全局事务异常时，二阶段回滚失败时，会复现。
你可以在TCC二阶段回滚故意抛异常，就会复现了。

[funky-eyes]

LGTM

[l81893521]

why not change the other TransactionalExecutor.ExecutionException constructor in

io.seata.tm.api.TransactionalTemplate#rollbackTransaction

[l81893521]

LGTM

[funky-eyes]

LGTM