Switch formatter to forked google-java-format CLI in dedicated JVM

[mkurz]

• Reverts Add sbt-java-formatter-add-opens plugin #261. The separate sbt-java-formatter-add-opens plugin/artifact is no longer needed.

Instead of wrapping sbt commands in another sbt process, the plugin now solves the underlying problem directly by running google-java-format in its own JVM with the required jdk.compiler access flags.

This uses the google-java-format CLI rather than the in-process library call, so formatter execution also works when javafmt is triggered indirectly, for example via javafmtOnCompile.

Before, formatting happened in-process via:

formatter.formatSourceAndFixImports(input)

Now the plugin launches a separate java process and invokes the google-java-format CLI with the required module flags.

From a user perspective, this is now transparent: no matter how javafmt gets invoked, the formatter runs in a JVM with the required flags. In particular, this fixes the javafmtOnCompile / task-dependency case that the previous wrapper-based approach could not handle reliably because it just created alias for the commands.

[mkurz]

This gets launched now when calling java formatter:

/home/mkurz/.sdkman/candidates/java/17.0.18-tem/bin/java @/tmp/google-java-format-java14461083564241482249.args

This is what /tmp/google-java-format-java14461083564241482249.args looks like (when calling e.g. javafmt):

-Xmx256m
--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
-cp
/home/mkurz/.sbt/1.0/plugins/target/scala-2.12/sbt-1.0/classes:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/sbt/sbt-dynver_2.12_1.0/5.1.1/sbt-dynver_2.12_1.0-5.1.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/sbt/sbt-pgp_2.12_1.0/2.3.1/sbt-pgp_2.12_1.0-2.3.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/sbt-scalafmt_2.12_1.0/2.5.6/sbt-scalafmt_2.12_1.0-2.5.6.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/sbt-contraband_2.12_1.0/0.8.0/sbt-contraband_2.12_1.0-0.8.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/sbt/sbt-header_2.12_1.0/5.11.0/sbt-header_2.12_1.0-5.11.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/sbt-assembly_2.12_1.0/2.3.1/sbt-assembly_2.12_1.0-2.3.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/typesafe/sbt-mima-plugin_2.12_1.0/1.1.5/sbt-mima-plugin_2.12_1.0-1.1.5.jar:/home/mkurz/.ivy2/local/com.github.sbt/sbt-java-formatter/scala_2.12/sbt_1.0/0.11.1-M1+0-1135ef89+20260415-1326-SNAPSHOT/jars/sbt-java-formatter.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/sbt-native-image_2.12_1.0/0.3.4/sbt-native-image-0.3.4.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/sbt-dependency-tree_2.12_1.0/1.12.2/sbt-dependency-tree_2.12_1.0-1.12.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/ch/epfl/scala/sbt-scalafix_2.12_1.0/0.14.5/sbt-scalafix_2.12_1.0-0.14.5.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/sbt/sbt-native-packager_2.12_1.0/1.11.7/sbt-native-packager_2.12_1.0-1.11.7.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/sbt/dynver_2.12/5.1.1/dynver_2.12-5.1.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/sbt/pgp-library_2.12/2.3.1/pgp-library_2.12-2.3.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/gigahorse-okhttp_2.12/0.4.0/gigahorse-okhttp_2.12-0.4.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/googlecode/java-diff-utils/diffutils/1.3.0/diffutils-1.3.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/scalafmt-sysops_2.12/3.10.0/scalafmt-sysops_2.12-3.10.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/scalafmt-dynamic_2.12/3.10.0/scalafmt-dynamic_2.12-3.10.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/contraband_2.12/0.8.0/contraband_2.12-0.8.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/jarjarabrams/jarjar-abrams-core_2.12/1.14.1/jarjar-abrams-core_2.12-1.14.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/typesafe/mima-core_2.12/1.1.5/mima-core_2.12-1.1.5.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/googlejavaformat/google-java-format/1.24.0/google-java-format-1.24.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit/5.13.5.202508271544-r/org.eclipse.jgit-5.13.5.202508271544-r.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/ch/epfl/scala/scalafix-interfaces/0.14.5/scalafix-interfaces-0.14.5.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/interface/1.0.28/interface-1.0.28.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-collection-compat_2.12/2.14.0/scala-collection-compat_2.12-2.14.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/apache/commons/commons-compress/1.28.0/commons-compress-1.28.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/apache/ant/ant/1.10.15/ant-1.10.15.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/eldis/tool-launcher/0.2.2/tool-launcher-0.2.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-parser-combinators_2.12/1.1.2/scala-parser-combinators_2.12-1.1.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-xml_2.12/2.3.0/scala-xml_2.12-2.3.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/lib/scala-library.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/bouncycastle/bcpg-jdk18on/1.78.1/bcpg-jdk18on-1.78.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/gigahorse-core_2.12/0.4.0/gigahorse-core_2.12-0.4.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/squareup/okhttp3/okhttp/3.14.0/okhttp-3.14.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/bigwheel/util-backports_2.12/2.1/util-backports_2.12-2.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/scalafmt-interfaces/3.10.0/scalafmt-interfaces-3.10.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/coursier_2.12/2.1.24/coursier_2.12-2.1.24.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/typesafe/config/1.4.5/config-1.4.5.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/parboiled/parboiled_2.12/2.5.1/parboiled_2.12-2.5.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/sjson-new-scalajson_2.12/0.10.0/sjson-new-scalajson_2.12-0.10.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/jarjar/jarjar/1.14.1/jarjar-1.14.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/lib/scala-reflect.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/guava/guava/32.1.3-jre/guava-32.1.3-jre.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/googlecode/javaewah/JavaEWAH/1.1.13/JavaEWAH-1.1.13.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/slf4j/slf4j-api/1.7.36/slf4j-api-1.7.36.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/commons-codec/commons-codec/1.19.0/commons-codec-1.19.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/commons-io/commons-io/2.20.0/commons-io-2.20.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/apache/commons/commons-lang3/3.18.0/commons-lang3-3.18.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/apache/ant/ant-launcher/1.10.15/ant-launcher-1.10.15.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/bouncycastle/bcprov-jdk18on/1.78.1/bcprov-jdk18on-1.78.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/bouncycastle/bcutil-jdk18on/1.78.1/bcutil-jdk18on-1.78.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/typesafe/ssl-config-core_2.12/0.2.2/ssl-config-core_2.12-0.2.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/reactivestreams/reactive-streams/1.0.2/reactive-streams-1.0.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/squareup/okio/okio/1.17.2/okio-1.17.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/dependency_2.12/0.3.2/dependency_2.12-0.3.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/github/plokhotnyuk/jsoniter-scala/jsoniter-scala-core_2.12/2.13.5.2/jsoniter-scala-core_2.12-2.13.5.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/coursier-core_2.12/2.1.24/coursier-core_2.12-2.1.24.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/coursier-cache_2.12/2.1.24/coursier-cache_2.12-2.1.24.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/coursier-proxy-setup/2.1.24/coursier-proxy-setup-2.1.24.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/sjson-new-core_2.12/0.10.0/sjson-new-core_2.12-0.10.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/shaded-scalajson_2.12/1.0.0-M4/shaded-scalajson_2.12-1.0.0-M4.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/eed3si9n/shaded-jawn-parser_2.12/1.3.2/shaded-jawn-parser_2.12-1.3.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/ow2/asm/asm/9.6/asm-9.6.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/ow2/asm/asm-commons/9.6/asm-commons-9.6.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/guava/listenablefuture/9999.0-empty-to-avoid-conflict-with-guava/listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/code/findbugs/jsr305/3.0.2/jsr305-3.0.2.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/checkerframework/checker-qual/3.37.0/checker-qual-3.37.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/errorprone/error_prone_annotations/2.21.1/error_prone_annotations-2.21.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/com/google/j2objc/j2objc-annotations/2.8/j2objc-annotations-2.8.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/github/alexarchambault/concurrent-reference-hash-map/1.1.0/concurrent-reference-hash-map-1.1.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/coursier-util_2.12/2.1.24/coursier-util_2.12-2.1.24.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/github/alexarchambault/is-terminal/0.1.1/is-terminal-0.1.1.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/jniutils/windows-jni-utils/0.3.3/windows-jni-utils-0.3.3.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/codehaus/plexus/plexus-archiver/4.10.0/plexus-archiver-4.10.0.jar:/home/mkurz/.cache/coursier/v1/https/repo1.maven.org/maven2/org/codehaus/plexus/plexus-container-default/2.1.1/plexus-container-default-2.1.1.jar:/home/mkurz/.cache/co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z/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/file-tree-views-2.1.12.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/run_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/slf4j-api-1.7.36.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/compiler-interface-1.12.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/sjson-new-core_2.12-0.10.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/shaded-apache-httpclient5-0.9.3.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/scripted-plugin_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/shaded-scalajson_2.12-1.0.0-M4.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/util-relation_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/scala-library-2.12.21.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/lm-coursier-shaded_2.12-2.1.10.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/task-system_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/io_2.12-1.10.5.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/ipcsocket-1.6.3.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/log4j-slf4j-impl-2.17.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/zero-allocation-hashing-0.16.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/util-position_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/sjson-new-scalajson_2.12-0.10.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/jline-terminal-jni-3.27.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/template-resolver-0.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/zinc-persist_2.12-1.12.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/util-cache_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/librarymanagement-core_2.12-1.12.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/checker-qual-3.4.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/main_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/zinc-classfile_2.12-1.12.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/tasks_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/zinc-lm-integration_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/logic_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/config-1.4.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/jsch-2.27.5.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/zinc-compile-core_2.12-1.12.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/sbinary_2.12-0.5.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/scala-reflect-2.12.21.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/zinc-apiinfo_2.12-1.12.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/scala-compiler-2.12.21.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/jline-reader-3.27.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/protocol_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/gigahorse-core_2.12-0.9.3.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/compiler-bridge_2.12-1.12.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/librarymanagement-ivy_2.12-1.12.0.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/jline-terminal-3.27.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/main-settings_2.12-1.12.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/log4j-core-2.17.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/launcher-interface-1.5.2.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/sjson-new-murmurhash_2.12-0.10.1.jar:/home/mkurz/.sbt/boot/scala-2.12.21/org.scala-sbt/sbt/1.12.2/jansi-2.4.1.jar
com.google.googlejavaformat.java.Main
--replace
/home/mkurz/git-repos/sbt/internal/util-interface/src/main/java/xsbti/Problem.java
/home/mkurz/git-repos/sbt/main/src/main/java/sbt/internal/JLineLoader.java

Here you can see Problem.java and JLineLoader.java needed reformatting.

So the classpath is the same as from the sbt session you are currently in. However that does not matter as only classes get loaded that the google formatter really needs.

[mkurz]

• Add CLI flag to disable modifier reordering google/google-java-format#1373