XWIKI-18833: Wrong classloader used for deserializing messages in remote observation manager

  * Use the classloader manager to use the right classloader for
    deserializing messages

(cherry picked from commit 86855db6)

xwiki-platform-core/xwiki-platform-observation/xwiki-platform-observation-remote/pom.xml

@@ -71,6 +71,11 @@
       <groupId>org.jgroups</groupId>
       <artifactId>jgroups</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.xwiki.commons</groupId>
+      <artifactId>xwiki-commons-classloader-api</artifactId>
+      <version>${commons.version}</version>
+    </dependency>
 
     <!-- Tests dependencies -->
     <dependency>

xwiki-platform-core/xwiki-platform-observation/xwiki-platform-observation-remote/src/main/java/org/xwiki/observation/remote/internal/jgroups/DefaultJGroupsReceiver.java

@@ -25,6 +25,7 @@
 import org.jgroups.Message;
 import org.jgroups.ReceiverAdapter;
 import org.slf4j.Logger;
+import org.xwiki.classloader.ClassLoaderManager;
 import org.xwiki.component.annotation.Component;
 import org.xwiki.component.manager.ComponentLookupException;
 import org.xwiki.component.manager.ComponentManager;
@@ -54,6 +55,9 @@ public class DefaultJGroupsReceiver extends ReceiverAdapter implements JGroupsRe
     @Inject
     private ComponentManager componentManager;
 
+    @Inject
+    private ClassLoaderManager classLoaderManager;
+
     /**
      * The logger to log.
      */
@@ -79,7 +83,8 @@ public RemoteObservationManager getRemoteObservationManager()
     @Override
     public void receive(Message msg)
     {
-        RemoteEventData remoteEvent = (RemoteEventData) msg.getObject();
+        RemoteEventData remoteEvent =
+            (RemoteEventData) msg.getObject(this.classLoaderManager.getURLClassLoader(null, false));
 
         this.logger.debug("Received JGroups remote event [{}]", remoteEvent);