Re: java.lang.OutOfMemoryError: allocLargeObjectOrArray

I have replaced JVM from jrockit-R27.4.0-jdk1.5.0_12/64Bit with SUN JVM version 1.5.0_16-b02 64Bit.
Since this change of the JVM so far (1,5 days) the issues has not occured again. But this means not too much, may be after 2 weeks without issues I can say if this was the fix and this JRockit-version the reason.

I have two more questions:

1) Max threads:
I have seen that default in 4.5.1 is:
ThreadPool Swiftlet -> Pools -> jms.connection ->> max threads 1
ThreadPool Swiftlet -> Pools -> jms.session ->> max threads 1

In version 7.x. this has changed per default from min/max to 5 for both.
May it make sense also to increase this in 4.5.1 version or is there a reason to do it not?

2) Recently released 7.4.0 version
Are there already any expierences or known issues with this version?
We work on upgrade 4.5.1 to 7.x and I would like to know if we should go for 7.3.2. or 7.4.

Thanks,
Michael