Improved:  Fix some bugs Spotbugs reports
No functional change: removes unused MODULE in ReferenceCleaner class
@@ -24,7 +24,6 @@ import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
public final class ReferenceCleaner {
- private static final String MODULE = ReferenceCleaner.class.getName();
private static final class CleanerThread extends Thread {
private boolean keepRunning = true;
