如何使用SYSCS_DIAG.LOCK_TABLE检查Derby锁（表总是显示为空）？

I'm trying to debug an issue with a Derby deadlock under Glassfish (EJB app). I want to view the lock table at various points so I wrote the following code. The problem is every where I place a call to it, the lock table is always coming back as empty. What am I missing?I'm trying to debug an issue with a Derby deadl