I have now found that the problem is most likely caused by eclipselink. I
used the update tool to install hibernate support, changed my persistence.xml
to specify provider org.hibernate.ejb.HibernatePersistence, redeployed and
now it works fine, although 50% slower than with eclipeslink. A pity, but
what's the point being fast for a while if it makes the server slow down and
then crach later.
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