[MSHADE-384] maven building hang when using multithread on jdk 11

**[Zhengqi Zhang](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=tony%20giao)** opened **[MSHADE-384](https://issues.apache.org/jira/browse/MSHADE-384?redirect=false)** and commented

When I use mvn clean package and add -T to the command, the console log stops on a certain line. then I use -X to start the debug log, and I find that I have been looping through something, as follows.**When I get rid of the -T parameter, everything is fine.When I switched to JDK8, it was fine to use multithreaded packaging**

!image-2021-02-24-20-04-58-353.png|width=943,height=574!

I get the thread stack, as shown in the figure below.

!image-2021-02-24-20-06-47-076.png|width=838,height=388!

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**Affects:** 3.2.1, 3.2.4

**Attachments:**
- [image-2021-02-24-20-04-58-353.png](https://issues.apache.org/jira/secure/attachment/13021109/image-2021-02-24-20-04-58-353.png) (_673.66 kB_)
- [image-2021-02-24-20-06-47-076.png](https://issues.apache.org/jira/secure/attachment/13021108/image-2021-02-24-20-06-47-076.png) (_404.11 kB_)

**Issue Links:**
- [FLINK-21499](https://issues.apache.org/jira/browse/FLINK-21499) maven package hang when using multithread on jdk 11

0 votes, 5 watchers

Start by reproducing the hang with `mvn clean package -T` on JDK 11 and capture the `-X` output and thread stack described in the issue. Compare the behavior with JDK 8 and without `-T`; done means the multithreaded Maven package completes reliably on JDK 11.

Written by the indexing model from the issue text.