fix/suppress compiler warnings

scm-core/src/main/java/sonia/scm/i18n/I18nMessages.java

@@ -116,6 +116,7 @@ public final class I18nMessages
    *
    * @return instance of message class
    */
+  @SuppressWarnings("unchecked")
   public synchronized static <T> T get(Class<T> msgClass, Locale locale)
   {
     CacheKey ck = new CacheKey(locale, msgClass);

scm-core/src/main/java/sonia/scm/repository/AbstractRepositoryManager.java

@@ -35,11 +35,6 @@ package sonia.scm.repository;
 
 //~--- non-JDK imports --------------------------------------------------------
 
-import com.google.common.collect.Maps;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import sonia.scm.HandlerEventType;
 import sonia.scm.event.ScmEventBus;
 import sonia.scm.util.AssertUtil;
@@ -54,12 +49,6 @@ import sonia.scm.util.AssertUtil;
 public abstract class AbstractRepositoryManager implements RepositoryManager
 {
 
-  /** the logger for AbstractRepositoryManager */
-  private static final Logger logger =
-    LoggerFactory.getLogger(AbstractRepositoryManager.class);
-
-  //~--- methods --------------------------------------------------------------
-
   /**
    * Sends a {@link RepositoryHookEvent} to each registered
    * {@link RepositoryHook} and sends the {@link RepositoryHookEvent} to

scm-core/src/test/java/sonia/scm/plugin/ScmModuleTest.java

@@ -59,6 +59,7 @@ public class ScmModuleTest
    *
    */
   @Test
+  @SuppressWarnings("unchecked")
   public void testUnmarshall()
   {
     URL resource = Resources.getResource("sonia/scm/plugin/module.xml");