BF: [ 2459542 ] Synchronize singletons

https://sourceforge.net/tracker/index.php?func=detail&aid=2459542&group_id=176962&atid=955896

Adempiere has several singleton classes which are not safe and must be synchronized.
Suggestion is to synchronize get methods in order to avoid concurrency issues.

base/src/org/compiere/util/CLogFilter.java

@@ -33,7 +33,7 @@ public class CLogFilter implements Filter
 	 * 	Get Filter
 	 *	@return singleton
 	 */
-	public static CLogFilter get()
+	public static synchronized CLogFilter get()
 	{
 		if (s_filter == null)
 			s_filter = new CLogFilter();

base/src/org/compiere/util/CLogFormatter.java

@@ -38,7 +38,7 @@ public class CLogFormatter extends Formatter
 	 * 	Get Formatter
 	 *	@return singleton
 	 */
-	public static CLogFormatter get()
+	public static synchronized CLogFormatter get()
 	{
 		if (s_formatter == null)
 			s_formatter = new CLogFormatter();

base/src/org/compiere/util/CacheMgt.java

@@ -19,7 +19,7 @@ package org.compiere.util;
 import java.util.ArrayList;
 
 /**
- *  Adempiere Cache Manangement
+ *  Adempiere Cache Management
  *
  *  @author Jorg Janke
  *  @version $Id: CacheMgt.java,v 1.2 2006/07/30 00:54:35 jjanke Exp $
@@ -28,9 +28,9 @@ public class CacheMgt
 {
 	/**
 	 * 	Get Cache Management
-	 * 	@return Cache Mgr
+	 * 	@return Cache Manager
 	 */
-	public static CacheMgt get()
+	public static synchronized CacheMgt get()
 	{
 		if (s_cache == null)
 			s_cache = new CacheMgt();

base/src/org/compiere/util/Msg.java

@@ -48,9 +48,9 @@ public final class Msg
 
 	/**
 	 * 	Get Message Object
-	 *	@return Mag
+	 *	@return Msg
 	 */
-	private static Msg get()
+	private static synchronized Msg get()
 	{
 		if (s_msg == null)
 			s_msg = new Msg();