Stop at Eclipse breakpoints when running an applicaion on JBoss AS 7.1

[red-planet]

Hello. I read the guide on https://community.jboss.org/thread/177687 and made the following steps.

1. I compiled and deployed my web project and deployed it on JBoss AS 7.1 by clicking Run on Server -> JBoss AS 7.1 in Eclipse.
2. I stopped JBoss AS in Eclipse.
3. I uncommented the line JAVA_OPTS="$JAVA_OPTS -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n" in the $JBOSS_HOME/bin/standalone.conf file
4. I executed $JBOSS_HOME/bin/standalone.sh
5. I updated the page localhost:8080/MyProject/ in the browser and it worked
6. I executed Debug -> Debug Configurations in Eclipse, then I created a new configuration with the localhost as the host, 8787 as the port, and MyProject as the project name.
7. I pressed the Debug button.

When I reach a breakpoint I added, nothing happens.

I expected that Eclipse would stop at the breakpoint as it does in a simple Java application project. What did I do wrong?

OS and Eclipse versions.

Eclipse version: Indigo.

Java.

java version "1.6.0_43" Java(TM) SE Runtime Environment (build 1.6.0_43-b01) Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01, mixed mode) 

Edit #1.

1. Window -> Preferences -> Java -> Installed JRE's
2. Edit JRE being used
3. Edit 'Default VM Arguments' line 

   -XX:+UseParallelGC

It didn't help.

[wdfink]

Do you see (Debug view) that the debugger is attached (i.e. disconnect button is active) and the breakpoint is marked as active?

[red-planet]

Yes, both the Disconnect button and the breakpoint are active.