[bdbxml] General questions regarding transactions et al

I'm still trying to get my app running, but the DB_LOCK_NOTGRANTED-error
remains. Here's what the console's up to when I start the program:

Updating documents 
Found 1 matching the expression   <--check, if file's present
Updating document: 
Updating with new document        <--if so, update the document in the container

---ENVIRONMENT DETAILS------     <-- some environment & transaction stuff 
max lockers: 100000
deadlock detection value: 0
reg size: 98304
stats (last) id: 964
curmaxid id: 2147483647
---TRANSACTION DETAILS------
transaction commits: 13
max transactions (getMaxTxns()): 20
last transaction id: -2147483634
no. of aborted transactions: 0
no. of active transactions: 1
reg size (getRegSize()): 16384
max active transactions(getMaNactive()): 2

Error performing document update against mainDataStorage.dbxml
   Message: Error: Db::del: DB_LOCK_NOTGRANTED: Lock not granted
Exception in thread "main" com.sleepycat.dbxml.XmlException: Error: Db::del:
DB_LOCK_NOTGRANTED: Lock not granted, errcode = DATABASE_ERROR
	at com.sleepycat.dbxml.dbxml_javaJNI.XmlContainer_updateDocument__SWIG_1(Native
Method)
	at com.sleepycat.dbxml.XmlContainer.updateDocument(XmlContainer.java:361)
	at ws.updateFile.doUpdateDocument(updateFile.java:109)
	at ws.updateFile.updateDocument(updateFile.java:247)
	at ws.updateFile.main(updateFile.java:275)

Are there some general issues I should be aware of? I really don't get it. Does
"max transactions" really have anything to do with the transactions committed?
If so, why should the actual stat be a problem? I've used to work with sql data
bases so this whole problem's just confusing me, stabbing around in the darkness
of transactional void. What would be the best approach to solve the problem? Any
clever way of debugging faulty (berkeley db xml) database actions? 

Thnx in advance,

M.B.



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