Tests: Java websockets tests.

test/java/websockets_mirror/app.java

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+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import javax.websocket.OnMessage;
+import javax.websocket.OnOpen;
+import javax.websocket.PongMessage;
+import javax.websocket.Session;
+import javax.websocket.server.ServerEndpoint;
+
+@ServerEndpoint("/")
+public class app {
+
+    @OnOpen
+    public void onOpen(Session session) {
+        session.setMaxTextMessageBufferSize(8388608);
+    }
+
+    @OnMessage
+    public void echoTextMessage(Session session, String msg) {
+        try {
+            if (session.isOpen()) {
+                session.getBasicRemote().sendText(msg, true);
+            }
+        } catch (IOException e) {
+            try {
+                session.close();
+            } catch (IOException e1) {
+                // Ignore
+            }
+        }
+    }
+
+    @OnMessage
+    public void echoBinaryMessage(Session session, ByteBuffer bb) {
+        try {
+            if (session.isOpen()) {
+                session.getBasicRemote().sendBinary(bb, true);
+            }
+        } catch (IOException e) {
+            try {
+                session.close();
+            } catch (IOException e1) {
+                // Ignore
+            }
+        }
+    }
+
+    /**
+     * Process a received pong. This is a NO-OP.
+     *
+     * @param pm    Ignored.
+     */
+    @OnMessage
+    public void echoPongMessage(PongMessage pm) {
+        // NO-OP
+    }
+}