7861: Bump Agent build to Java 11 compliance and cleanup POM

[RealCLanger]

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The JMC Agent project is set up in a somewhat awkward way at the moment. The maven.compiler.source and maven.compiler.target properties are set to 1.8 but we enforce a JDK 11 during the build and also have a test case that implicitly uses/tests JDK11 features. Maybe it is time now to bump the agent to Java 11 compliance?

Furthermore, the POM file could be cleaned up and a few maven plugins that are used could be bumped to more recent versions.

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Issue

• JMC-7861: Bump Agent build to Java 11 compliance and cleanup POM

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[bridgekeeper[bot]]

:wave: Welcome back clanger! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[mlbridge[bot]]

Webrevs

• 02: Full - Incremental (9ba93841)
• 01: Full - Incremental (b144c770)
• 00: Full (6e16c710)

[openjdk[bot]]

@RealCLanger This change now passes all automated pre-integration checks.

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After integration, the commit message for the final commit will be:

7861: Bump Agent build to Java 11 compliance and cleanup POM

Reviewed-by: hirt

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[RealCLanger]

Thanks for the review. I merged master and deleted the .gitignored org.eclipse.jdt.core.prefs file. When checks pass I will integrate.

[RealCLanger]

/integrate

[openjdk[bot]]

Going to push as commit bd35870e44a7260bb017826d97ac8cfc03b0c111.

[openjdk[bot]]

@RealCLanger Pushed as commit bd35870e44a7260bb017826d97ac8cfc03b0c111.

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