[MCOMPILER-540] - useIncrementalCompilation=false may add generated sources to the sources list

Author: mensinda

src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java

@@ -940,6 +940,7 @@ public void execute() throws MojoExecutionException, CompilationFailureException
                 return;
             }
 
+            staleSources = filterSourceFiles(staleSources);
             compilerConfiguration.setSourceFiles(staleSources);
 
             try {
@@ -1793,6 +1794,17 @@ public void setRelease(String release) {
         targetOrReleaseSet = true;
     }
 
+    private Set<File> filterSourceFiles(Set<File> sourceFiles) {
+        final File generatedSources = getGeneratedSourcesDirectory();
+        if (generatedSources == null) {
+            return sourceFiles;
+        }
+        final String generatedSourcesPath = generatedSources.getAbsolutePath();
+        return sourceFiles.stream()
+                .filter(x -> !x.getAbsolutePath().startsWith(generatedSourcesPath))
+                .collect(Collectors.toSet());
+    }
+
     final String getImplicit() {
         return implicit;
     }