Upgrade antlr4 to 4.10.1

[zhfeng]

Fixes #19990.

Changes proposed in this pull request:

• Bump antlr4 to 4.10.1
• Only run antlr4-maven-plugin in JDK 11
• Add generated sources in JDK 8
• After merging this PR, we should clarify on docs and wiki that it needs to use JDK 11 to build sources at first as it can generate codes for the g4 parseres.

---

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[zhfeng]

@TeslaCN @terrymanu can you take a review?

[terrymanu]

LGTM

[TeslaCN]

Hi @zhfeng
It seems that you have moved generated directory outside the target. The IDEA cannot recognize the code automatically.

[zhfeng]

Sorry for the inconvenience. I took these changes because it could build with JDK 11 to generate the parser codes only once, and mvn clean install could work with JDK 8. Ony when you change g4 files, you have to re-generate these codes by JDK 11. I suppose that this could less impact on the developers with JDK 8.

The for IDEA, I think you have to add source directory manually. such as src/main/generated. Do you have any other thought?

[TeslaCN]

Sorry for the inconvenience. I took these changes because it could build with JDK 11 to generate the parser codes only once, and mvn clean install could work with JDK 8. Ony when you change g4 files, you have to re-generate these codes by JDK 11. I suppose that this could less impact on the developers with JDK 8.

The for IDEA, I think you have to add source directory manually. such as src/main/generated. Do you have any other thought?

I don't think manually add source directory is acceptable. Because we need to add 15 modules manually to start Proxy or run unit tests in IDEA, and these settings might be lost after doing some operation.

I will raise a PR to restore the path of generated codes.

[zhfeng]

@TeslaCN can you try this setting?

[TeslaCN]

@TeslaCN can you try this setting?

Of course I can. But I prefer the way that developers could open the project without addtional settings.

[zhfeng]

OK, I just wonder why IDEA could find target\generate-sources\antlr4 as a source directory? It seems that antlr-maven-plugin is also running with generate-sources phase.

[zhfeng]

Hmm, it detects target and subdirectory automatically.