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Hard-code Java versions for plugins other than
maven-surefire-plugin
.
In particular: - Use JDK 22 for compilation (also, for any other [affected plugins](https://maven.apache.org/guides/mini/guide-using-toolchains.html#prerequisites)) to [avoid a JDK 11 bug](#7331). - Another way to avoid that bug would be to use JDK 8, which [would also provide a `--release`-like compatibility guarantee](#3990). However, that could complicate [using newer APIs conditionally](#6549). And of course we'd expect JDK 8 to be buggier than JDK 22. (In fact, we still have a workaround or two for JDK 8 bugs (with a brand new one coming in cl/655556207), and we could now remove those—assuming that none of our users use JDK 8 to build Guava outside of our Maven build.) JDK 22 also supports new versions of Error Prone, while JDK 8 does not. - This change also allows us to simplify our Error Prone configuration, which until now needed different profiles in order to support both JDK 8 and JDK 9+. We could now upgrade Error Prone, but I haven't done so yet. There are probably other simplifications that we could perform, as well, such as `maven-javadoc-plugin.additionalJOptions`. - Originally, I'd set up this CL to explicitly set only the toolchain of `maven-compiler-plugin` to 22. I had it using 11 for any other plugins (just Animal Sniffer, maybe?), I think from when I was trying to get toolchains to take effect at all. I've since changed this CL to set the _default_ toolchain to 22 while still including overrides for `maven-javadoc-plugin` and `maven-surefire-plugin`. - Continue to use JDK 11 for Javadoc, as [we're doing now](https://github.com/google/guava/blob/5041fbe61965a73ea269c7c24ea746d89bd1b1ba/.github/workflows/ci.yml#L89-L99) because of [problems with at least JDK 21](#7109). - What matters might actually be the version used [by _JDiff_](#6549 (comment)), which comes from the version in the linked `ci.yml` file. But since we're using JDK 11 currently for docs in general, I'm sticking with that for now. Still, we should consider [upgrading the version used for Javadoc generation](#6790 (comment)). But this CL is already complicated enough.... - When we hard-code JDK 11, we need to change the `<source>${java.specification.version}</source>` line: That would otherwise set (for example) `-source 17` when running Maven under JDK 17, and JDK 11 wouldn't recognize it. As I recall, the `java.specification.version` usage was from the days in which we tried to inherit Javadoc from the JDK. Inheritance had [stopped working](#6790), and we ripped it out in cl/614693592. I first tried going with the default from the JDK whose Javadoc binary we're using, which (again) will now be 11. But that led to a problem in `org.codehaus.plexus.languages.java.jpms.CmdModuleNameExtractor`, which apparently tries to look up the module name for the `-source 11` run but uses the Maven run's JDK instead of the Javadoc toolchain or Maven toolchain. So now I've set it to 8 to match what we use for `maven-compiler-plugin`. (I _thought_ I had remembered that `maven-javadoc-plugin` defaulted to matching `maven-compiler-plugin`, even though that's weird. Maybe the two actually just read from the same Maven property or something, or maybe the behavior changed.) Some other thing I'm wondering: - I wonder if we should activate(?) some of the plugins, including the new toolchain plugins, in the `<plugins>` (not just `<pluginManagement>`) section of the parent `pom.xml`. Might that save us from having to do so in each separate `pom.xml`? (We might actually mostly get away with activating(?) them only in the main `guava` build: That _downloads and registers_ the toolchains, and then at least the other projects' _per-plugin_ toolchain configuration probably finds them? But for the more general configuration to work, I think we at least need to activate(?) `maven-toolchains-plugin` in each? I haven't experimented a ton with this.) - I forgot the other thing while I was typing :( (See also [these notes](#5457 (comment)).) Fixes #7331 RELNOTES=n/a PiperOrigin-RevId: 655592201
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