Question on error

[cwampler]

I am using the LRUAlgorithm for my puts. They all work perfectly nicely but every once and a while on a put I will get this:

java.lang.NullPointerException
at org.jboss.cache.eviction.LRUAlgorithm.processQueues(LRUAlgorithm.java:72)
at org.jboss.cache.eviction.LRUAlgorithm.process(LRUAlgorithm.java:51)
at org.jboss.cache.eviction.EvictionTimerTask.run(EvictionTimerTask.java:33)
at java.util.TimerThread.mainLoop(Timer.java:432)
at java.util.TimerThread.run(Timer.java:382)

What is happening on line 72 of LRUAlgorithm that could cause this?

Thanks,
Chris

[ben.wang]

Chris,

Thanks for reporting the problem. Can you give me more detailed info on how can I reproduce the problem? BTW, I am currently out of town and won't be able to look into this problem untill next week.

Thanks,

-Ben

[cwampler]

It is while doing a bulk insert of a few thousand elements and it seems to happen about once every 4 or 5 runs. And it isn't ever really on the same element. Sometimes it will only get through 50 or 60 and sometimes it does 10000 before it crashes.

Thanks again,
Chris

[cwampler]

Ben,

When you get a chance please let me know what is coming up null. Is it something I can check before each "put"?

Thanks again,
Chris

[ben.wang]

Chris,

I've taken a look at the source code. I can see a chance for the null pointer exception.

Is there a test case that you can send me to reproduce this problem so I can validate it? I'd like to add it to the JUnit test suite as well.

Otherwise, I will fix it and have you tested out for me. :-)

Thanks,

-Ben

[cwampler]

Unfortunately I couldn't send you the code to test since it is hitting up on the DB (which is constantly changing itself). All I am doing is a mass bulk from a DB table (about 20000 at a time), and they are all just simple strings. ie
cache.put("/DBConstant/State", "California", "5");
cache.put("/DBConstant/Sex", "Male", "1");
cache.put("/DBConstant/UserCode", "Chris", "admin");

And I would be more than happy to test it for you.

Thanks again for your reply,
Chris

[ben.wang]

Chris,

I have a fix here for you to test it out. Can you send me your email address? Mine is [e-mail]. I will mail you the new jar.

Thanks,

-Ben

[ben.wang]

Just to let everyone knows that this bug has been fixed.

Thanks,

-Ben