Fix comment

Author: arturobernalg

api/maven-api-core/src/main/java/org/apache/maven/api/Constants.java

@@ -660,5 +660,11 @@ public final class Constants {
      */
     public static final String MAVEN_LOGGER_LOG_PREFIX = MAVEN_LOGGER_PREFIX + "log.";
 
+    /**
+     * System property to keep temp material for diagnostics.
+     *
+     */
+    public static final String KEEP_PROP = "maven.tempfile.keep";
+
     private Constants() {}
 }

api/maven-api-core/src/main/java/org/apache/maven/api/services/TempFileService.java

@@ -21,41 +21,49 @@
 import java.io.IOException;
 import java.nio.file.Path;
 
+import org.apache.maven.api.Service;
 import org.apache.maven.api.Session;
+import org.apache.maven.api.annotations.Nonnull;
 
 /**
  * Service to create and track temporary files/directories for a Maven build.
  * All created paths are deleted automatically when the session ends.
  */
-public interface TempFileService {
+public interface TempFileService extends Service {
 
     /**
      * Creates a temp file in the default temp directory.
      */
+    @Nonnull
     Path createTempFile(Session session, String prefix, String suffix) throws IOException;
 
     /**
      * Creates a temp file in the given directory.
      */
+    @Nonnull
     Path createTempFile(Session session, String prefix, String suffix, Path directory) throws IOException;
 
     /**
      * Creates a temp directory in the default temp directory.
      */
+    @Nonnull
     Path createTempDirectory(Session session, String prefix) throws IOException;
 
     /**
      * Creates a temp directory in the given directory.
      */
+    @Nonnull
     Path createTempDirectory(Session session, String prefix, Path directory) throws IOException;
 
     /**
      * Registers an externally created path for cleanup at session end.
      */
+    @Nonnull
     void register(Session session, Path path);
 
     /**
      * Forces cleanup for the given session (normally called by lifecycle).
      */
+    @Nonnull
     void cleanup(Session session) throws IOException;
 }

impl/maven-core/src/main/java/org/apache/maven/internal/impl/DefaultTempFileService.java

@@ -18,6 +18,8 @@
  */
 package org.apache.maven.internal.impl;
 
+import static org.apache.maven.api.Constants.KEEP_PROP;
+
 import javax.inject.Inject;
 import javax.inject.Named;
 import javax.inject.Singleton;
@@ -52,8 +54,7 @@ public final class DefaultTempFileService implements TempFileService {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(DefaultTempFileService.class);
 
-    // System property to keep temp material for diagnostics.
-    private static final String KEEP_PROP = "maven.tempfile.keep";
+
 
     // unique, typed session key (uses factory; one narrow unchecked cast)
     @SuppressWarnings({"unchecked", "rawtypes"})
@@ -64,11 +65,6 @@ public final class DefaultTempFileService implements TempFileService {
     private static final Supplier<Set<Path>> TMP_SUPPLIER =
             () -> Collections.newSetFromMap(new ConcurrentHashMap<Path, Boolean>());
 
-    @Inject
-    public DefaultTempFileService() {
-        // default
-    }
-
     @Override
     public Path createTempFile(final Session session, final String prefix, final String suffix) throws IOException {
         Objects.requireNonNull(session, "session");