Metadata nullpointer bug fixed

README.md

@@ -33,7 +33,7 @@ We have implemented a very basic demo application to see OpenVidu in action. To
  - Run this Docker container
    
    ```
-   docker run -p 8080:8080 -p 8443:8443 -e KMS_STUN_IP=193.147.51.12 -e KMS_STUN_PORT=3478 -e openvidu.security=false openvidu/openvidu-plainjs-demo
+   docker run -p 8443:8443 -e KMS_STUN_IP=193.147.51.12 -e KMS_STUN_PORT=3478 -e openvidu.security=false openvidu/openvidu-plainjs-demo
    ```
    
  - Go to [`https://localhost:8443`](https://localhost:8443) and accept the self-signed certificate to enjoy your app. You should mute your speakers to avoid disruptive audio feedback.
@@ -307,13 +307,13 @@ API reference
 
 | Event                  | Properties            | Description                  |
 | -----------------------| --------------------- | ---------------------------- |
-| `videoElementCreated`      | element:HTMLVideoElement | Triggered by Publisher object inmediately after a new video element has been added to DOM |
+| `videoElementCreated`      | element:HTMLVideoElement | Triggered by Subscriber object inmediately after a new video element has been added to DOM |
 
 #### **Connection**
 | Property    | Type   | Description                  |
 | ------------| ------ | ---------------------------- |
 | `connectionId` | string | Unique identifier of the connection |
-| `data` | string | Data associated to this connection (and therefore to the user). This is an important field: it allows you to broadcast all the information you want for each user (a username, for example)  |
+| `data` | string | Data associated to this connection (and therefore to certain user). This is an important field: it allows you to broadcast all the information you want for each user (a username, for example)  |
 | `creationTime` | number | Time when this connection was created |
 
 ## openvidu-backend-client
@@ -481,6 +481,7 @@ ng serve
 ```
 **/openvidu**
 ```
+mvn compile -DskipTests=true
 mvn install -DskipTests=true
 ```
 **/openvidu/openvidu-server**

openvidu-browser/src/main/resources/ts/OpenViduInternal/Connection.ts

@@ -1,4 +1,3 @@
-// Participant --------------------------------
 import { Stream, StreamOptions } from './Stream';
 import { OpenViduInternal } from './OpenViduInternal';
 import { SessionInternal } from './SessionInternal';

openvidu-server/src/main/java/org/openvidu/server/core/api/pojo/UserParticipant.java

@@ -23,18 +23,19 @@ package org.openvidu.server.core.api.pojo;
  *
  */
 public class UserParticipant {
+	
   private String participantId;
   private String userName;
-  private String clientMetadata;
-  private String serverMetadata;
+  private String clientMetadata = "";
+  private String serverMetadata = "";
   private boolean streaming = false;
+  
+  private final String METADATA_SEPARATOR = "%/%";
 
   public UserParticipant(String participantId, String userName, boolean streaming) {
     super();
     this.participantId = participantId;
     this.userName = userName;
-    this.clientMetadata = "";
-    this.serverMetadata = "";
     this.streaming = streaming;
   }
   
@@ -94,7 +95,14 @@ public class UserParticipant {
   }
   
   public String getFullMetadata(){
-	  return this.clientMetadata + "-/-" + this.serverMetadata;
+	  String fullMetadata;
+	  if ((!this.clientMetadata.isEmpty()) && (!this.serverMetadata.isEmpty())){
+		  fullMetadata = this.clientMetadata + METADATA_SEPARATOR + this.serverMetadata;
+	  }
+	  else {
+		  fullMetadata = this.clientMetadata + this.serverMetadata;
+	  }
+	  return fullMetadata;
   }
 
   @Override

openvidu-server/src/main/java/org/openvidu/server/core/internal/DefaultNotificationRoomHandler.java

@@ -71,7 +71,7 @@ public class DefaultNotificationRoomHandler implements NotificationRoomHandler {
       
       // Metadata associated to each existing participant
       participantJson
-      	  .addProperty(ProtocolElements.JOINROOM_METADATA_PARAM, participant.getClientMetadata() + "--" +  participant.getServerMetadata());
+      	  .addProperty(ProtocolElements.JOINROOM_METADATA_PARAM, participant.getFullMetadata());
       
       if (participant.isStreaming()) {
         JsonObject stream = new JsonObject();

openvidu-server/src/main/java/org/openvidu/server/security/Token.java

@@ -4,8 +4,8 @@ public class Token {
 	
 	String token;
 	ParticipantRole role;
-	String serverMetadata;
-	String clientMetadata ;
+	String serverMetadata = "";
+	String clientMetadata = "";
 	
 	public Token(String token) {
 		this.token = token;