feat: add .mvn/extensions.xml to Maven cache key pattern

README.md

@@ -135,7 +135,7 @@ Currently, the following distributions are supported:
 The action has a built-in functionality for caching and restoring dependencies. It uses [toolkit/cache](https://github.com/actions/toolkit/tree/main/packages/cache) under hood for caching dependencies but requires less configuration settings. Supported package managers are gradle, maven and sbt. The format of the used cache key is `setup-java-${{ platform }}-${{ packageManager }}-${{ fileHash }}`, where the hash is based on the following files:
 
 - gradle: `**/*.gradle*`, `**/gradle-wrapper.properties`, `buildSrc/**/Versions.kt`, `buildSrc/**/Dependencies.kt`, `gradle/*.versions.toml`, and `**/versions.properties`
-- maven: `**/pom.xml` and `**/.mvn/wrapper/maven-wrapper.properties`
+- maven: `**/pom.xml`, `**/.mvn/wrapper/maven-wrapper.properties`, and `**/.mvn/extensions.xml`
 - sbt: all sbt build definition files `**/*.sbt`, `**/project/build.properties`, `**/project/**.scala`, `**/project/**.sbt`
 
 When the option `cache-dependency-path` is specified, the hash is based on the matching file. This option supports wildcards and a list of file names, and is especially useful for monorepos.

__tests__/cache.test.ts

@@ -100,7 +100,7 @@ describe('dependency cache', () => {
         await expect(restore('maven', '')).rejects.toThrow(
           `No file in ${projectRoot(
             workspace
-          )} matched to [**/pom.xml,**/.mvn/wrapper/maven-wrapper.properties], make sure you have checked out the target repository`
+          )} matched to [**/pom.xml,**/.mvn/wrapper/maven-wrapper.properties,**/.mvn/extensions.xml], make sure you have checked out the target repository`
         );
       });
       it('downloads cache based on pom.xml', async () => {
@@ -115,7 +115,7 @@ describe('dependency cache', () => {
           expect.any(String)
         );
         expect(spyGlobHashFiles).toHaveBeenCalledWith(
-          '**/pom.xml\n**/.mvn/wrapper/maven-wrapper.properties'
+          '**/pom.xml\n**/.mvn/wrapper/maven-wrapper.properties\n**/.mvn/extensions.xml'
         );
         expect(spyWarning).not.toHaveBeenCalled();
         expect(spyInfo).toHaveBeenCalledWith('maven cache is not found');
@@ -136,7 +136,25 @@ describe('dependency cache', () => {
           expect.any(String)
         );
         expect(spyGlobHashFiles).toHaveBeenCalledWith(
-          '**/pom.xml\n**/.mvn/wrapper/maven-wrapper.properties'
+          '**/pom.xml\n**/.mvn/wrapper/maven-wrapper.properties\n**/.mvn/extensions.xml'
+        );
+        expect(spyWarning).not.toHaveBeenCalled();
+        expect(spyInfo).toHaveBeenCalledWith('maven cache is not found');
+      });
+      it('downloads cache based on extensions.xml', async () => {
+        createDirectory(join(workspace, '.mvn'));
+        createFile(join(workspace, '.mvn', 'extensions.xml'));
+
+        await restore('maven', '');
+        expect(spyCacheRestore).toHaveBeenCalledWith(
+          [
+            join(os.homedir(), '.m2', 'repository'),
+            join(os.homedir(), '.m2', 'wrapper', 'dists')
+          ],
+          expect.any(String)
+        );
+        expect(spyGlobHashFiles).toHaveBeenCalledWith(
+          '**/pom.xml\n**/.mvn/wrapper/maven-wrapper.properties\n**/.mvn/extensions.xml'
         );
         expect(spyWarning).not.toHaveBeenCalled();
         expect(spyInfo).toHaveBeenCalledWith('maven cache is not found');