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From "Mark Derricutt" <m...@talios.com>
Subject Anyone using annotationProcessorPaths in maven-compiler-plugin
Date Wed, 23 Mar 2016 23:37:13 GMT
Hey all,

Has anyone successfully used the new `<annotationProcessorPaths>` setting in the `maven-compiler-plugin`
at all?

I'm adding:

```xml
<annotationProcessorPaths>
  <path>
    <groupId>com.google.dagger</groupId>
    <artifactId>dagger-compiler</artifactId>
    <version>2.1</version>
  </path>
</annotationProcessorPaths>
```

to my compiler plugins configuration but it doesn't seem to work, when running maven with
-X I see the configuration is picked up, but it doesn't seem to get passed to the compiler
at all?

```xml
[DEBUG] Goal:          org.apache.maven.plugins:maven-compiler-plugin:3.5.1:compile (default-compile)
[DEBUG] Style:         Regular
[DEBUG] Configuration: <?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <annotationProcessorPaths>
    <path>
      <groupId>com.google.dagger</groupId>
      <artifactId>dagger-compiler</artifactId>
      <version>2.1</version>
    </path>
  </annotationProcessorPaths>
  <basedir default-value="${basedir}"/>
  <buildDirectory default-value="${project.build.directory}"/>
  <classpathElements default-value="${project.compileClasspathElements}"/>
  <compileSourceRoots default-value="${project.compileSourceRoots}"/>
  <compilerId default-value="javac">${maven.compiler.compilerId}</compilerId>
  <compilerReuseStrategy default-value="${reuseCreated}">${maven.compiler.compilerReuseStrategy}</compilerReuseStrategy>
  <compilerVersion>${maven.compiler.compilerVersion}</compilerVersion>
  <debug default-value="true">${maven.compiler.debug}</debug>
  <debuglevel>${maven.compiler.debuglevel}</debuglevel>
  <encoding default-value="${project.build.sourceEncoding}">${encoding}</encoding>
  <executable>${maven.compiler.executable}</executable>
  <failOnError default-value="true">${maven.compiler.failOnError}</failOnError>
  <forceJavacCompilerUse default-value="false">${maven.compiler.forceJavacCompilerUse}</forceJavacCompilerUse>
  <fork default-value="false">${maven.compiler.fork}</fork>
  <generatedSourcesDirectory default-value="${project.build.directory}/generated-sources/annotations"/>
  <maxmem>${maven.compiler.maxmem}</maxmem>
  <meminitial>${maven.compiler.meminitial}</meminitial>
  <mojoExecution default-value="${mojoExecution}"/>
  <optimize default-value="false">${maven.compiler.optimize}</optimize>
  <outputDirectory default-value="${project.build.outputDirectory}"/>
  <project default-value="${project}"/>
  <projectArtifact default-value="${project.artifact}"/>
  <session default-value="${session}"/>
  <showDeprecation default-value="false">${maven.compiler.showDeprecation}</showDeprecation>
  <showWarnings default-value="false">${maven.compiler.showWarnings}</showWarnings>
  <skipMain>${maven.main.skip}</skipMain>
  <skipMultiThreadWarning default-value="false">${maven.compiler.skipMultiThreadWarning}</skipMultiThreadWarning>
  <source default-value="1.5">${maven.compiler.source}</source>
  <staleMillis default-value="0">${lastModGranularityMs}</staleMillis>
  <target default-value="1.5">${maven.compiler.target}</target>
  <useIncrementalCompilation default-value="true">${maven.compiler.useIncrementalCompilation}</useIncrementalCompilation>
  <verbose default-value="false">${maven.compiler.verbose}</verbose>
</configuration>
```

When running the compiler with `<verbose>true</verbose>` I don't see the `dagger-compiler`
artefact anywhere on the paths mentioned ( to be expected since it should be on the annotation
path not class-path, but we don't print out the annotation path ).

Am I missing something simple?  Including `dagger-compiler` as a normal dependency works fine,
but then bleeds into the class path.

Mark


-- 
Mark Derricutt
http://www.theoryinpractice.net
http://www.chaliceofblood.net
http://plus.google.com/+MarkDerricutt
http://twitter.com/talios
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