[sonar] Loggers should be 'private static final' and should share a naming convention

easyrules-core/src/main/java/org/easyrules/core/AbstractRulesEngine.java

@@ -18,7 +18,7 @@ import java.util.logging.Logger;
  */
 public abstract class AbstractRulesEngine<R> implements RulesEngine<R> {
 
-    protected static final Logger LOGGER = Logger.getLogger(EasyRulesConstants.LOGGER_NAME);
+    private static final Logger LOGGER = Logger.getLogger(EasyRulesConstants.LOGGER_NAME);
 
     /**
      * The rules set.

easyrules-core/src/main/java/org/easyrules/core/AnnotatedRulesEngine.java

@@ -11,6 +11,7 @@ import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.*;
 import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * Annotated rules engine implementation.
@@ -19,6 +20,8 @@ import java.util.logging.Level;
  */
 public class AnnotatedRulesEngine extends AbstractRulesEngine<Object> {
 
+    private static final Logger LOGGER = Logger.getLogger(EasyRulesConstants.LOGGER_NAME);
+
     private List<RuleBean> ruleBeans;
 
     /**

easyrules-core/src/main/java/org/easyrules/core/DefaultRulesEngine.java

@@ -29,6 +29,7 @@ import org.easyrules.util.EasyRulesConstants;
 
 import java.util.TreeSet;
 import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * Default {@link org.easyrules.api.RulesEngine} implementation.<br/>
@@ -41,6 +42,8 @@ import java.util.logging.Level;
  */
 public class DefaultRulesEngine extends AbstractRulesEngine<Rule> {
 
+    private static final Logger LOGGER = Logger.getLogger(EasyRulesConstants.LOGGER_NAME);
+
     /**
      * Construct a default rules engine with default values.
      */