Some minor cleanup fixing IDE warnings

src/main/java/org/apache/maven/buildcache/BuildCacheMojosExecutionStrategy.java

@@ -79,7 +79,7 @@ public class BuildCacheMojosExecutionStrategy implements MojosExecutionStrategy
     private final MojoParametersListener mojoListener;
     private final LifecyclePhasesHelper lifecyclePhasesHelper;
     private final MavenPluginManager mavenPluginManager;
-    private MojoExecutionScope mojoExecutionScope;
+    private final MojoExecutionScope mojoExecutionScope;
 
     @Inject
     public BuildCacheMojosExecutionStrategy(
@@ -434,6 +434,6 @@ private static String normalizedPath(Path path, Path baseDirPath) {
     private enum CacheRestorationStatus {
         SUCCESS,
         FAILURE,
-        FAILURE_NEEDS_CLEAN;
+        FAILURE_NEEDS_CLEAN
     }
 }

src/main/java/org/apache/maven/buildcache/CacheControllerImpl.java

@@ -137,7 +137,7 @@ public class CacheControllerImpl implements CacheController {
      * (ex : generated source basedir).
      * Used to link the resource to its path on disk
      */
-    private Map<String, Path> attachedResourcesPathsById = new HashMap<>();
+    private final Map<String, Path> attachedResourcesPathsById = new HashMap<>();
 
     private int attachedResourceCounter = 0;
 
@@ -467,7 +467,7 @@ private Future<File> createDownloadTask(
             if (!Files.exists(artifactFile)) {
                 throw new FileNotFoundException("Missing file for cached build, cannot restore. File: " + artifactFile);
             }
-            LOGGER.debug("Downloaded artifact " + artifact.getArtifactId() + " to: " + artifactFile);
+            LOGGER.debug("Downloaded artifact {} to: {}", artifact.getArtifactId(), artifactFile);
             return restoreArtifactHandler
                     .adjustArchiveArtifactVersion(project, originalVersion, artifactFile)
                     .toFile();

src/main/java/org/apache/maven/buildcache/DefaultMultiModuleSupport.java

@@ -24,6 +24,7 @@
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
@@ -132,7 +133,7 @@ private synchronized void buildModel(MavenSession session) {
         File multiModulePomFile = getMultiModulePomFile(session);
 
         ProjectBuildingRequest projectBuildingRequest = currentProject.getProjectBuildingRequest();
-        boolean profilesMatched = projectBuildingRequest.getActiveProfileIds().containsAll(scanProfiles);
+        boolean profilesMatched = new HashSet<>(projectBuildingRequest.getActiveProfileIds()).containsAll(scanProfiles);
 
         // we are building from root with the same profiles, no need to re-scan the whole multi-module project
         if (currentProject.getFile().getAbsolutePath().equals(multiModulePomFile.getAbsolutePath())

src/main/java/org/apache/maven/buildcache/DefaultRestoredArtifactHandler.java

@@ -24,10 +24,10 @@
 
 import java.io.BufferedOutputStream;
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Enumeration;
@@ -96,7 +96,7 @@ public Path adjustArchiveArtifactVersion(MavenProject project, String originalAr
         String pomPropsVersion = "version=" + currentVersion;
         try (JarFile jarFile = new JarFile(artifactFile.toFile())) {
             try (JarOutputStream jos =
-                    new JarOutputStream(new BufferedOutputStream(new FileOutputStream(tmpJarFile)))) {
+                    new JarOutputStream(new BufferedOutputStream(Files.newOutputStream(tmpJarFile.toPath())))) {
                 // Copy original jar file to the temporary one.
                 Enumeration<JarEntry> jarEntries = jarFile.entries();
                 byte[] buffer = new byte[1024];
@@ -140,7 +140,7 @@ public Path adjustArchiveArtifactVersion(MavenProject project, String originalAr
     private static void replaceEntry(
             JarFile jarFile, JarEntry entry, String toReplace, String replacement, JarOutputStream jos)
             throws IOException {
-        String fullManifest = IOUtils.toString(jarFile.getInputStream(entry), StandardCharsets.UTF_8.name());
+        String fullManifest = IOUtils.toString(jarFile.getInputStream(entry), StandardCharsets.UTF_8);
         String modified = fullManifest.replaceAll(toReplace, replacement);
 
         byte[] bytes = modified.getBytes(StandardCharsets.UTF_8);

src/main/java/org/apache/maven/buildcache/RemoteCacheRepositoryNoOp.java

@@ -58,7 +58,6 @@ public boolean getArtifactContent(
         return false;
     }
 
-    @Nonnull
     @Override
     public String getResourceUrl(CacheContext context, String filename) {
         return null;

src/main/java/org/apache/maven/buildcache/checksum/MavenProjectInput.java

@@ -82,7 +82,6 @@
 import org.apache.maven.model.Resource;
 import org.apache.maven.model.io.xpp3.MavenXpp3Writer;
 import org.apache.maven.project.MavenProject;
-import org.codehaus.plexus.util.IOUtil;
 import org.codehaus.plexus.util.WriterFactory;
 import org.eclipse.aether.RepositorySystem;
 import org.eclipse.aether.artifact.DefaultArtifactType;
@@ -344,19 +343,13 @@ private boolean checkItemMatchesBaseline(ProjectsInputInfo baselineBuild, Digest
     private String getEffectivePom(Model prototype) throws IOException {
         ByteArrayOutputStream output = new ByteArrayOutputStream();
 
-        Writer writer = null;
-        try {
-            writer = WriterFactory.newXmlWriter(output);
+        try (Writer writer = WriterFactory.newXmlWriter(output)) {
             new MavenXpp3Writer().write(writer, prototype);
 
             // normalize env specifics
             final String[] searchList = {baseDirPath.toString(), "\\", "windows", "linux"};
             final String[] replacementList = {"", "/", "os.classifier", "os.classifier"};
-
             return replaceEachRepeatedly(output.toString(), searchList, replacementList);
-
-        } finally {
-            IOUtil.close(writer);
         }
     }
 
@@ -520,7 +513,7 @@ public FileVisitResult preVisitDirectory(Path path, BasicFileAttributes basicFil
                     return FileVisitResult.SKIP_SUBTREE;
                 }
 
-                walkDirectoryFiles(path, collectedFiles, key.getGlob(), entry -> exclusionResolver.excludesPath(entry));
+                walkDirectoryFiles(path, collectedFiles, key.getGlob(), exclusionResolver::excludesPath);
 
                 if (!key.isRecursive()) {
                     LOGGER.debug("Skipping subtree (non recursive): {}", path);

src/main/java/org/apache/maven/buildcache/checksum/exclude/Exclusion.java

@@ -146,12 +146,12 @@ public boolean excludesPath(Path parentPath, Path path) {
 
     public enum MatcherType {
         FILENAME,
-        PATH;
+        PATH
     }
 
     public enum EntryType {
         FILE,
         DIRECTORY,
-        ALL;
+        ALL
     }
 }

src/main/java/org/apache/maven/buildcache/hash/CloseableBuffer.java

@@ -34,16 +34,12 @@
  */
 public class CloseableBuffer implements AutoCloseable {
 
-    private static final Cleaner CLEANER = doPrivileged(new PrivilegedAction<Cleaner>() {
-
-        @Override
-        public Cleaner run() {
-            final String jsv = System.getProperty("java.specification.version", "9");
-            if (jsv.startsWith("1.")) {
-                return DirectCleaner.isSupported() ? new DirectCleaner() : new NoopCleaner();
-            } else {
-                return UnsafeCleaner.isSupported() ? new UnsafeCleaner() : new NoopCleaner();
-            }
+    private static final Cleaner CLEANER = doPrivileged((PrivilegedAction<Cleaner>) () -> {
+        final String jsv = System.getProperty("java.specification.version", "9");
+        if (jsv.startsWith("1.")) {
+            return DirectCleaner.isSupported() ? new DirectCleaner() : new NoopCleaner();
+        } else {
+            return UnsafeCleaner.isSupported() ? new UnsafeCleaner() : new NoopCleaner();
         }
     });
 
@@ -75,13 +71,7 @@ public ByteBuffer getBuffer() {
     @Override
     public void close() {
         // Java 8: () -> CLEANER.clean(buffer)
-        boolean done = doPrivileged(new PrivilegedAction<Boolean>() {
-
-            @Override
-            public Boolean run() {
-                return CLEANER.clean(buffer);
-            }
-        });
+        boolean done = doPrivileged((PrivilegedAction<Boolean>) () -> CLEANER.clean(buffer));
         if (done) {
             buffer = null;
         }

src/main/java/org/apache/maven/buildcache/xml/CacheConfigImpl.java

@@ -138,8 +138,9 @@ public CacheState initialize() {
                     final boolean enabled = getProperty(CACHE_ENABLED_PROPERTY_NAME, true);
 
                     if (!rtInfo.isMavenVersion("[3.9.0,)")) {
-                        LOGGER.warn("Cache requires Maven >= 3.9, but version is " + rtInfo.getMavenVersion()
-                                + ". Disabling cache.");
+                        LOGGER.warn(
+                                "Cache requires Maven >= 3.9, but version is {}. Disabling cache.",
+                                rtInfo.getMavenVersion());
                         state = CacheState.DISABLED;
                     } else if (!enabled) {
                         LOGGER.info("Cache disabled by command line flag, project will be built fully and not cached");