Incremental compile doesn't seem to work

[Don Noit]

I'm using GMavenplus 3.0.2 with maven-compiler-plugin to compile in a project with both Groovy and Java code.  

Even if there are no code changes, I always see the same output during the ocmpile phase:

[INFO] --- gmavenplus-plugin:3.0.2:compile (default) @ z-api ---
[INFO] Using isolated classloader, without GMavenPlus classpath.
[INFO] Using Groovy 4.0.22 to perform compile.
[INFO] invokedynamic enabled.
[INFO] Parallel parsing enabled.
[INFO] Compiled 4159 files.

I'm wondering: Does GMavenPlus not support incremental compiles, or am I missing something obvious? Would appreciate any pointers.

Excerpt from my POM.xml:

<plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-compiler-plugin</artifactId>
 <version>3.11.0</version>
 <configuration>
  <useIncrementalCompilation>true</useIncrementalCompilation>
  <source>17</source>
  <target>17</target>
 </configuration>
</plugin>
<plugin>
  <groupId>org.codehaus.gmavenplus</groupId>
  <artifactId>gmavenplus-plugin</artifactId>
  <version>3.0.2</version>
  <configuration>
  <targetBytecode>17</targetBytecode>
  <jvmArgs>
  <jvmArg>--add-opens</jvmArg>
  <jvmArg>java.base/java.lang=ALL-UNNAMED</jvmArg>
  </jvmArgs>
  </configuration>
<executions>
  <execution>
   <goals>
   <goal>addSources</goal>
   <goal>addTestSources</goal>
   <goal>compile</goal>
   <goal>compileTests</goal>
  </goals>
  </execution>
</executions>
</plugin>

[Keegan Witt]

The plugin resets the modification date on the generated stubs, causing the Maven Compiler Plugin to see them as updated sources. This logic was copied from the original GMaven plugin, which implemented it to mitigate MGROOVY-187, which was the Maven Compiler Plugin overwriting classes compiled by groovyc. This breaks things because the stubs lack the full class implementations. As the name suggests, they are just stubs. I created https://github.com/groovy/GMavenPlus/issues/141 a long while back to try to come up with a way to support incremental compilation. But it's a problem I haven't yet solved.

So unfortunately, for the time being, this is expected behavior.

-Keegan

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