NullPointerException

3962

I got this exception while writing to a database today.

java.lang.NullPointerException
at com.sleepycat.je.tree.LN.log(LN.java:534)
at com.sleepycat.je.tree.LN.log(LN.java:373)
at com.sleepycat.je.tree.BIN.logDirtyLN(BIN.java:1016)
at com.sleepycat.je.tree.BIN.evictInternal(BIN.java:985)
at com.sleepycat.je.tree.BIN.evictLNs(BIN.java:940)
at com.sleepycat.je.evictor.Evictor.evictIN(Evictor.java:761)
at com.sleepycat.je.evictor.Evictor.evictBatch(Evictor.java:344)
at com.sleepycat.je.evictor.Evictor.doEvict(Evictor.java:244)
at com.sleepycat.je.evictor.Evictor.doCriticalEviction(Evictor.java:269)
at com.sleepycat.je.dbi.CursorImpl.close(CursorImpl.java:711)
at com.sleepycat.je.Cursor.close(Cursor.java:326)
at com.sleepycat.je.Database.putInternal(Database.java:999)
at com.sleepycat.je.Database.put(Database.java:885)
at com.sleepycat.persist.PrimaryIndex.putNoReturn(PrimaryIndex.java:428)
at com.sleepycat.persist.PrimaryIndex.putNoReturn(PrimaryIndex.java:402)
.....

Here is our configuration:

StoreConfig storeConfig = new StoreConfig();
storeConfig.setAllowCreate(true);
storeConfig.setTemporary(true);
storeConfig.setTransactional(false);

Have you seen this before?

Trevor

Greybird-Oracle

Hi Trevor,

No, we haven't seen this before.

I see what's causing the NPE from your stack trace, and it looks like the underlying cause exception is being discarded.

Is this reproducible? If so, I can give you a one line change that will reveal the underlying exception.

--mark

Greybird-Oracle

Trevor,

The NullPointerException problem has been fixed and this will be in the next 3.3 patch release. The ticket is #17551.

If you are able to reproduce the problem, it would sure be nice to know what the underlying exception was. Without further information from you, I have to assume it was an IOException (disk full perhaps) or something similar. If you can reproduce it, please apply this tiny change and try it again:

diff -c -r1.152.2.3 LN.java
*** src/com/sleepycat/je/tree/LN.java    5 May 2009 19:59:21 -0000    
1.152.2.3
--- src/com/sleepycat/je/tree/LN.java    28 Jul 2009 03:45:34 -0000
***************
*** 531,537 ****
           * If any exception happens during logging, then force this txn
           * to onlyAbortable. [#15768]
           */
!         locker.setOnlyAbortable();
          throw DE;
      }
          clearDirty();
--- 531,539 ----
           * If any exception happens during logging, then force this txn
           * to onlyAbortable. [#15768]
           */
!             if (locker != null) {
!                 locker.setOnlyAbortable();
!             }
          throw DE;
      }
          clearDirty();

Thanks,
--mark