Issue using @GenerateTypeAdapter with maven

[mseele]

I experienced an issue with the maven configuration of auto-value-gson-extension using @GenerateTypeAdapter.
Please see my demo Repository here: https://github.com/mseele/auto-value-gson-test

When i run mvn clean compile with the current setup, no Test_GsonTypeAdapter is created.

I deep dive into the issue by debugging via mvnDebug clean compile and found out that com.google.auto.value.processor.AutoValueProcessor.init(ProcessingEnvironment) throws the following error:

[AutoValueExtensionsException] An exception occurred while looking for AutoValue extensions. No extensions will function.java.lang.NoClassDefFoundError: com.squareup.javapoet.TypeName
	at java.base/java.lang.J9VMInternals.prepareClassImpl(Native Method)
	at java.base/java.lang.J9VMInternals.prepare(J9VMInternals.java:341)
	at java.base/java.lang.Class.getConstructor(Class.java:669)
	at com.google.auto.value.processor.SimpleServiceLoader.load(SimpleServiceLoader.java:73)
	at com.google.auto.value.processor.SimpleServiceLoader.load(SimpleServiceLoader.java:49)
	at com.google.auto.value.processor.AutoValueProcessor.extensionsFromLoader(AutoValueProcessor.java:105)
	at com.google.auto.value.processor.AutoValueProcessor.init(AutoValueProcessor.java:115)
	at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$ProcessorState.<init>(JavacProcessingEnvironment.java:686)
	at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors$ProcessorStateIterator.next(JavacProcessingEnvironment.java:786)
	at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:881)
	at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1222)
	at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1335)
	at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1258)
	at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:936)
	at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
	at com.sun.tools.javac.api.JavacTaskImpl$$Lambda$136/0x0000000000000000.call(Unknown Source)
	at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:147)
	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:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	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)
Caused by: java.lang.ClassNotFoundException: com.squareup.javapoet.TypeName
	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:605)
	at java.base/java.lang.ClassLoader.loadClassHelper(ClassLoader.java:1185)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:1100)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:1083)
	... 45 more

(but unfortunately is not output in the console)

Adding

<path>
    <groupId>com.squareup</groupId>
    <artifactId>javapoet</artifactId>
    <version>1.13.0</version>
</path>

to the <annotationProcessorPaths> triggers the next exception (now visible on the console):

Fatal error compiling: java.lang.NoClassDefFoundError: com.ryanharter.auto.value.gson.GenerateTypeAdapter

After adding

<path>
    <groupId>com.ryanharter.auto.value</groupId>
    <artifactId>auto-value-gson-runtime</artifactId>
    <version>${auto-value-gson.version}</version>
</path>

everything works.

Please see https://github.com/mseele/auto-value-gson-test/blob/master/pom.xml. The current version triggers the error. I've commented out the two items that need to be there to make it work.

[ZacSweers]

Not very familiar with using maven, seems your build is not resolving dependencies. This works fine in basically every Gradle project so not sure there's anything we can do here. Seems you'll need to troubleshoot your build issue

[mseele]

Just for documentation reasons:
I got time to look into this a little deeper. Seems like i ran into this maven bug:
https://issues.apache.org/jira/browse/MCOMPILER-272

Only the transitive dependencies of the first entry are resolved so far. Moving path auto-value-gson-extension up will resolve the issue.