fixed security issue

Author: Janith Bandara

src/main/java/org/audit4j/core/Context.java

@@ -162,7 +162,7 @@ final static void init() {
 				defaultAnnotationTransformer.setSerializer(serializerCommand.getSerializer());
 			}
 			annotationTransformer = defaultAnnotationTransformer;
-			
+
 			// Initialize IO streams.
 			initStreams();
 
@@ -347,7 +347,9 @@ private static void initHandlers() {
 		for (Handler handler : conf.getHandlers()) {
 			try {
 				if (!configContext.getHandlers().contains(handler)) {
-					handler.setProperties(configContext.getProperties());
+					Map<String, String> handlerproperties = new HashMap<>();
+					handlerproperties.putAll(configContext.getProperties());
+					handler.setProperties(handlerproperties);
 					handler.init();
 					configContext.addHandler(handler);
 				}

src/main/java/org/audit4j/core/handler/Handler.java

@@ -19,6 +19,7 @@
 package org.audit4j.core.handler;
 
 import java.io.Serializable;
+import java.util.HashMap;
 import java.util.Map;
 
 import org.audit4j.core.Initializable;
@@ -85,7 +86,7 @@ public AuditEvent getAuditEvent() {
      * @param auditEvent
      *            the new audit event
      */
-    public void setAuditEvent(AuditEvent auditEvent) {
+    public void setAuditEvent(final AuditEvent auditEvent) {
         this.auditEvent = auditEvent;
     }
 
@@ -115,7 +116,7 @@ public String getProperty(String key) {
      * @param properties
      *            the properties
      */
-    public void setProperties(Map<String, String> properties) {
+    public void setProperties(final Map<String, String> properties) {
         this.properties = properties;
     }
 }