diff --git a/inc/event.h b/inc/event.h
index 8a06449..b4f9f37 100644
--- a/inc/event.h
+++ b/inc/event.h
@@ -10,12 +10,12 @@ private:
 	jobject input;    //original Event object (type CppEvent)
 	std::map<std::string, void*> data;
 public:
-	jobject getMap(JNIEnv* env);
-	const std::string& getName() const;
-	void* getData(JNIEnv* env, const std::string& name);
-	void setData(const std::string& name, void* data);
+	virtual jobject getMap(JNIEnv* env);
+	virtual const std::string& getName() const;
+	virtual void* getData(JNIEnv* env, const std::string& name);
+	virtual void setData(const std::string& name, void* data);
 
-	void reapply(JNIEnv* env, jobject jevent);
+	virtual void reapply(JNIEnv* env, jobject jevent);
 
 	Event(JNIEnv* env, jobject jevent);
 	//virtual ~Event();
diff --git a/inc/libplugin.h b/inc/libplugin.h
index 7e0d3ea..eca3ab0 100644
--- a/inc/libplugin.h
+++ b/inc/libplugin.h
@@ -18,6 +18,7 @@ extern jfieldID EVENTDATAF;
 extern jfieldID EVENTNAMEF;
 extern jmethodID MAPGET;
 extern jmethodID MAPPUT;
+extern jmethodID MAPCLEAR;
 extern jmethodID LISTENERCONTR;
 extern jmethodID LISTENERSMALLCONTR;
 
@@ -32,8 +33,9 @@ enum JNIDATA : long {
 	JNI_EVENTNAMEFIELD = 32 | JNI_EVENTCLASS,
 	JNI_MAPGETMETH = 64  | JNI_MAPCLASS,
 	JNI_MAPPUTMETH = 128 | JNI_MAPCLASS,
-	JNI_LISTENERCONSTR = 256 | JNI_LISTENERCLASS,
-	JNI_LISTENERSMALLCONSTR = 512 | JNI_LISTENERCLASS,
+	JNI_MAPCLEARMETH = 256 | JNI_MAPCLASS,
+	JNI_LISTENERCONSTR = 512 | JNI_LISTENERCLASS,
+	JNI_LISTENERSMALLCONSTR = 1024 | JNI_LISTENERCLASS,
 
 	JNI_EVENT = JNI_EVENTCLASS | JNI_EVENTDATAFIELD | JNI_EVENTNAMEFIELD,
 	JNI_MAP = JNI_MAPCLASS | JNI_MAPGETMETH | JNI_MAPPUTMETH,
diff --git a/inc/plugin.h b/inc/plugin.h
index 8ba9594..4c5f2ca 100644
--- a/inc/plugin.h
+++ b/inc/plugin.h
@@ -10,7 +10,7 @@
 class CppPlugin;
 
 //function pointer
-typedef void (*eventfptr)(CppPlugin*, Event*);
+typedef void (*eventfptr)(JNIEnv*, CppPlugin*, Event*);
 typedef CppPlugin* (*initfptr)();
 
 class CppPlugin {
diff --git a/src/main/cpp/src/event.cpp b/src/main/cpp/src/event.cpp
index d641ee9..691b67b 100644
--- a/src/main/cpp/src/event.cpp
+++ b/src/main/cpp/src/event.cpp
@@ -12,23 +12,31 @@ const std::string& Event::getName() const {
 }
 
 void* Event::getData(JNIEnv* env, const std::string& name) {
-	std::cout << "Try to access " << name << std::endl;
+	DEB("Try to access " << name);
+	load(env, JNI_MAP);
 	//search in map
 	auto it = data.find(name);
 	if(it == data.end()) {
+		DEB("Not in map");
+
 		//search in original object
 		//construct string
 		jstring term = env->NewStringUTF(name.c_str());
 
 		//call data.get()
+		DEB("Access Java-Map");
 		jobject map = getMap(env);
 		jobject content = env->CallObjectMethod(map, MAPGET, term);
+		DEB("Got " << content);
 
 		//data.insert for next time
 		data.insert({name, content});
 
 		//delete string
+		DEB("Delete REF");
 		env->DeleteLocalRef(term);
+
+		return content;
 	} else {
 		return it->second;
 	}
@@ -38,13 +46,18 @@ void* Event::getData(JNIEnv* env, const std::string& name) {
 
 void Event::setData(const std::string& name, void* d) {
 	//just put it in the map
-	data.insert({name, d});
+	data.erase(name); //delete old
+	data.insert({name, d});//insert new
 }
 
 void Event::reapply(JNIEnv* env, jobject jevent) {
 	jobject map = getMap(env);
+
+	//clear old map
+	env->CallObjectMethod(map, MAPCLEAR);
+
 	for(auto it : data) {
-		std::cout << "write back to java: " << it.first << std::endl;
+		std::cout << "write back to java: " << it.first << " Value: " << it.second << std::endl;
 		jstring key = env->NewStringUTF(it.first.c_str());
 
 		env->CallObjectMethod(map, MAPPUT, key, it.second);
diff --git a/src/main/cpp/src/libplugin.cpp b/src/main/cpp/src/libplugin.cpp
index 59a2904..106b60d 100644
--- a/src/main/cpp/src/libplugin.cpp
+++ b/src/main/cpp/src/libplugin.cpp
@@ -17,6 +17,7 @@ jfieldID EVENTDATAF;
 jfieldID EVENTNAMEF;
 jmethodID MAPGET;
 jmethodID MAPPUT;
+jmethodID MAPCLEAR;
 jmethodID LISTENERCONTR;
 jmethodID LISTENERSMALLCONTR;
 
@@ -84,12 +85,14 @@ void load(JNIEnv* env, long data) {
 		MAPGET = env->GetMethodID(MAPCLASS, "get", "(Ljava/lang/Object;)Ljava/lang/Object;");
 	if(data & JNI_MAPPUTMETH)
 		MAPPUT = env->GetMethodID(MAPCLASS, "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
+	if(data & JNI_MAPCLEARMETH)
+		MAPCLEAR = env->GetMethodID(MAPCLASS, "clear", "()V");
 	if(data & JNI_LISTENERCONSTR)
 		LISTENERCONTR = env->GetMethodID(LISTENERCLASS, "<init>", "(Ljava/lang/String;J)V");
 	if(data & JNI_LISTENERSMALLCONSTR)
 		LISTENERSMALLCONTR = env->GetMethodID(LISTENERCLASS, "<init>", "()V");
 
-	DEB("find methods: " << (!!MAPGET) << (!!MAPPUT) << (!!LISTENERCONTR) << (!!LISTENERSMALLCONTR));
+	DEB("find methods: " << (!!MAPGET) << (!!MAPPUT) << (!!MAPCLEAR) << (!!LISTENERCONTR) << (!!LISTENERSMALLCONTR));
 }
 
 JNIEXPORT jboolean JNICALL Java_de_mrbesen_cppplugins_CppPlugin_init_1(JNIEnv* env, jobject thisobj) {
@@ -187,7 +190,7 @@ JNIEXPORT jobject JNICALL Java_de_mrbesen_cppplugins_CppPlugin_fireEvent(JNIEnv*
 	Event event(env, jevent);
 
 	//call it
-	f(plugin, &event);
+	f(env, plugin, &event);
 
 	//put changed fields back in the jevent
 	event.reapply(env, jevent);
diff --git a/src/main/java/de/mrbesen/cppplugins/CppEvent.java b/src/main/java/de/mrbesen/cppplugins/CppEvent.java
index f435cae..e95f56f 100644
--- a/src/main/java/de/mrbesen/cppplugins/CppEvent.java
+++ b/src/main/java/de/mrbesen/cppplugins/CppEvent.java
@@ -19,7 +19,7 @@ public class CppEvent {
 		System.out.println("cppifying event: " + e.getClass().getSimpleName());
 		CppEvent cppe = new CppEvent(e.getClass().getSimpleName());
 
-		for(Field field : e.getClass().getFields()) {
+		for(Field field : e.getClass().getDeclaredFields()) {
 			System.out.println("try to read Field: " + field.getName());
 			if(!field.isAccessible()) field.setAccessible(true);
 
@@ -34,19 +34,21 @@ public class CppEvent {
 	}
 
 	public static void uncppify(CppEvent cppe, Event original) {
-		System.out.println("uncppifying event: " + original.getClass().getSimpleName());
+		System.out.println("uncppifying event: " + original.getClass().getSimpleName() + " values: " + cppe.data.size());
 		if(!original.getClass().getSimpleName().equals(cppe.name))
 			throw new IllegalArgumentException("CppEvent does not match original event type!");
 
-		for(Field field : original.getClass().getFields()) {
+		for(Field field : original.getClass().getDeclaredFields()) {
 			System.out.println("try to set Field: " + field.getName());
-			if(!field.isAccessible()) field.setAccessible(true);
 
 			Object value = cppe.data.get(field.getName());
 			if(value == null) {
 				System.out.println("Data not available - skip");
 				continue;
 			}
+			System.out.println("value: " + value);
+
+			if(!field.isAccessible()) field.setAccessible(true);
 
 			try {
 				field.set(original, value);
diff --git a/src/main/java/de/mrbesen/cppplugins/CppPlugin.java b/src/main/java/de/mrbesen/cppplugins/CppPlugin.java
index be4804f..6df2f15 100644
--- a/src/main/java/de/mrbesen/cppplugins/CppPlugin.java
+++ b/src/main/java/de/mrbesen/cppplugins/CppPlugin.java
@@ -9,6 +9,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.generator.ChunkGenerator;
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginDescriptionFile;
diff --git a/testplugins/simpleEvents/src/plugin.cpp b/testplugins/simpleEvents/src/plugin.cpp
index 6efb873..656b692 100644
--- a/testplugins/simpleEvents/src/plugin.cpp
+++ b/testplugins/simpleEvents/src/plugin.cpp
@@ -6,14 +6,6 @@
 
 extern "C" {
 
-void eventJoin(CppPlugin* pl, Event* e) {
-	std::cout << "join " << e->getName() << std::endl;
-}
-
-void eventQuit(CppPlugin* pl, Event* e) {
-	std::cout << "quit " << e->getName() << std::endl;
-}
-
 class MyPlugin : public CppPlugin {
 public:
     virtual void onLoad();
@@ -39,6 +31,18 @@ CppPlugin* init() {
     return new MyPlugin();
 }
 
+void eventJoin(JNIEnv* env, CppPlugin* pl, Event* e) {
+	jstring msg = (jstring) e->getData(env, "joinMessage");
+	std::string jmsg(env->GetStringUTFChars(msg, 0));
+	std::cout << "join " << e->getName() << " old join message: " << jmsg << std::endl;
+	jstring newmsg = env->NewStringUTF("Ein Spieler ist dem Spiel beigetreten!");
+	e->setData("joinMessage", newmsg);
+}
+
+void eventQuit(JNIEnv* env, CppPlugin* pl, Event* e) {
+	std::cout << "quit " << e->getName() << std::endl;
+}
+
 std::map<std::string, eventfptr> MyPlugin::getEvents() {
 	std::cout << "MyPlugin::getEvents" << std::endl;
 	std::map<std::string, eventfptr> out;
@@ -46,10 +50,5 @@ std::map<std::string, eventfptr> MyPlugin::getEvents() {
 	out.insert({"PlayerQuitEvent", eventQuit});
 	return out;
 }
-/*
-std::map<std::string, eventfptr> MyPlugin::getEvents() {
-	return std::map<std::string, eventfptr>();
-}
-*/
 
 }//extern "C"
\ No newline at end of file