Error in OpenESB: "MBeanServerConnection is null."

I was trying to learn about OpenESB following a tutorial.  When I was running the test for the composite application in Part 3, the test often took tens of seconds before it could complete.  It seemed that the test needed to wait due to the error below:

java.lang.RuntimeException: MBeanServerConnection is null. Make sure the App Server is running.

After some investigation, I found that the error could be fixed by entering a correct password to the GlassFish server, where the default password was "adminadmin".  With this fix, the test could be completed in two seconds on my computer.