JDK 16: cannot access class com.sun.tools.javac.api.BasicJavacTask

We tried upgrading to JDK 16, and we’re getting the following exception from errorprone. We’re using 2.5.1. See: https://github.com/GoogleCloudPlatform/spring-cloud-gcp/pull/391

java.lang.IllegalAccessError: class com.google.errorprone.BaseErrorProneJavaCompiler (in unnamed module @0x38c55a8a) cannot access class com.sun.tools.javac.api.BasicJavacTask (in module jdk.compiler) because module jdk.compiler does not export com.sun.tools.javac.api to unnamed module @0x38c55a8a
	at com.google.errorprone.BaseErrorProneJavaCompiler.addTaskListener(BaseErrorProneJavaCompiler.java:94)
	at com.google.errorprone.ErrorProneJavacPlugin.init(ErrorProneJavacPlugin.java:34)
	at jdk.compiler/com.sun.tools.javac.api.BasicJavacTask.initPlugin(BasicJavacTask.java:255)
	at jdk.compiler/com.sun.tools.javac.api.BasicJavacTask.initPlugins(BasicJavacTask.java:229)
	at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.prepareCompiler(JavacTaskImpl.java:204)
	at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:101)
	at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:152)
	at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
	at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)
	at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:126)
	at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:174)
	at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:1134)
	at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:187)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:210)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:156)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:957)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:289)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:193)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:567)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:567)
	at org.apache.maven.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:39)
	at org.apache.maven.wrapper.WrapperExecutor.execute(WrapperExecutor.java:122)
	at org.apache.maven.wrapper.MavenWrapperMain.main(MavenWrapperMain.java:55)

[tbroyer]

See https://github.com/google/error-prone/issues/1157#issuecomment-769289564

Doc has been updated recently to reflect the needed changes: https://errorprone.info/docs/installation#jdk-16

(fwiw, I’m still working on having this built into the Gradle plugin, should be available soon)

[tbroyer]

For Gradle, I just released v2.0.0 of the net.ltgt.errorprone plugin that does just that; but you’re using Maven.

Fwiw, the “solution” in Lombok is a hack (https://github.com/rzwitserloot/lombok/commit/9806e5cca4b449159ad0509dafde81951b8a8523) relying on internal details of the JDK (https://github.com/openjdk/jdk/blob/5a7f22ab94bff4899b2f36ba27ea120ee7d8f1db/src/java.base/share/classes/java/lang/Module.java#L862-L878); but Lombok is already hacks on top of hacks so it’s just one more of them… but the non-hacky solution was the same: https://github.com/rzwitserloot/lombok/issues/2681#issuecomment-745952541