Update debugging.md

doc/cygnus-ngsi/user_and_programmer_guide/debugging.md

@@ -25,7 +25,7 @@ cygnus:
   volumes:
     - ${CYGNUS_CONF}/agent.conf:/opt/apache-flume/conf/agent.conf
   environment:
-    - CYGNUS_JAVA_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=6006
+    - CYGNUS_JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:6006
     - CYGNUS_SKIP_CONF_GENERATION=true
   log_driver: json-file
   log_opt:
@@ -53,6 +53,17 @@ Warning: JAVA_HOME is not set!
 Listening for transport dt_socket at address: 6006
 ```
 
+## Attaching java jdb debugger 
+```
+ jdb -attach 127.0.0.1:6006
+```
+```
+Set uncaught java.lang.Throwable
+Set deferred uncaught java.lang.Throwable
+Initializing jdb ...
+> 
+```
+
 ## Attaching IntelliJ debugger.
 
 Once the container is up and running it's time to setup IntelliJ.
@@ -91,4 +102,4 @@ When de debugger is attached you will see the output:
 Connected to the target VM, address: 'localhost:6006', transport: 'socket'
 ```
 
-This means the IntelliJ debugger attached successfully to the container.
+This means the IntelliJ debugger attached successfully to the container.