NPE when closing JpaPagingItemReader

[brunoaranda]

Hi,

I have a test (running spring tests) that for no apparent reason (there has to be one ) has started to throw a NullPointerException when closing the JpaPagingItemReader. The reason appears to be that the EntityManager is null when the reader is invoking the doClose() method.

I am using the last stable release 2.0.1. This is the exception cause:

Caused by: java.lang.NullPointerException
	at org.springframework.batch.item.database.JpaPagingItemReader.doClose(JpaPagingItemReader.java:140)
	at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.close(AbstractItemCountingItemStreamItemReader.java:98)
	... 42 more

I have tried with the 2.0.0 version to no avail. I fail to understand what kind of change in my side may have provoked this. How can it be that the EntityManager is null when closing the JpaPagingItemReader? I am not setting it to null myself anywhere...

Thanks,

Bruno

[Dave Syer]

Maybe the ItemReader was never opened? Is it a multithreaded step? Can you try a snapshot?

[brunoaranda]

The reason seems to be that I forgot to add the reader to the <batch:streams> section... now it seems to be working fine.