feat: Maven plugin uses CompileSourceRoots (#1847 fixes #1846)

Author: nedtwigg

plugin-maven/CHANGES.md

@@ -4,6 +4,9 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 
 ## [Unreleased]
 
+### Added
+* CompileSourceRoots and TestCompileSourceRoots are now respected as default includes. These properties are commonly set when adding extra source directories. ([#1846](https://github.com/diffplug/spotless/issues/1846))
+
 ## [2.40.0] - 2023-09-28
 ### Added
 * Add `-DspotlessIdeHook` that provides the ability to apply Spotless exclusively to a specified file. It accepts the absolute path of the file. ([#1782](https://github.com/diffplug/spotless/pull/1782))

plugin-maven/src/main/java/com/diffplug/spotless/maven/java/Java.java

@@ -20,8 +20,9 @@
 import java.io.File;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Set;
-import java.util.stream.Stream;
 
 import org.apache.maven.model.Build;
 import org.apache.maven.project.MavenProject;
@@ -44,7 +45,15 @@ public class Java extends FormatterFactory {
 	public Set<String> defaultIncludes(MavenProject project) {
 		Path projectDir = project.getBasedir().toPath();
 		Build build = project.getBuild();
-		return Stream.of(build.getSourceDirectory(), build.getTestSourceDirectory())
+
+		List<String> includes = new ArrayList<>();
+		includes.add(build.getSourceDirectory());
+		includes.add(build.getTestSourceDirectory());
+		includes.addAll(project.getCompileSourceRoots());
+		includes.addAll(project.getTestCompileSourceRoots());
+
+		return includes.stream()
+				.distinct()
 				.map(Paths::get)
 				.map(projectDir::relativize)
 				.map(Java::fileMask)