Fixed unchanged sources check

File .maven-processor-source-files.txt must be skipped in lastModified check (being just an extra file added for control purposes), especially because it is rewritten in method areSourceFilesSameAsPreviousRun, so its lastModified date is necessarily the most recent one, which causes method to always return true.

processor/src/main/java/org/bsc/maven/plugin/processor/AbstractAnnotationProcessorMojo.java

@@ -597,7 +597,8 @@ private List<String> prepareOptions(JavaCompiler compiler) throws MojoExecutionE
   }
 
   private boolean isSourcesUnchanged(List<JavaFileObject> allSources) throws IOException {
-    if (!areSourceFilesSameAsPreviousRun(allSources))
+    Path sourceFileList = outputDirectory.toPath().resolve(".maven-processor-source-files.txt");
+    if (!areSourceFilesSameAsPreviousRun(allSources, sourceFileList))
       return false;
 
     long maxSourceDate = allSources.stream()
@@ -612,7 +613,7 @@ private boolean isSourcesUnchanged(List<JavaFileObject> allSources) throws IOExc
       @Override
       public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
           throws IOException {
-        if (Files.isRegularFile(file)) {
+        if (Files.isRegularFile(file) && !file.equals(sourceFileList)) {
           maxOutputDate.updateAndGet(t -> Math.max(t, file.toFile().lastModified()));
         }
         return FileVisitResult.CONTINUE;
@@ -631,11 +632,11 @@ public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
    * Checks the list of {@code allSources} against the stored list of source files in a previous run.
    *
    * @param allSources
+   * @param sourceFileList
    * @return {@code true} when the filenames of the previous run matches exactly with the current run.
    * @throws IOException
    */
-  private boolean areSourceFilesSameAsPreviousRun(List<JavaFileObject> allSources) throws IOException {
-    Path sourceFileList = outputDirectory.toPath().resolve(".maven-processor-source-files.txt");
+  private boolean areSourceFilesSameAsPreviousRun(List<JavaFileObject> allSources, Path sourceFileList) throws IOException {
     try {
       if (!Files.exists(sourceFileList)) {
         getLog().debug("File with previous sources " + sourceFileList + " not found, treating as first run");