StackOverflow error if you look up java:TransactionManager and nothing is bound there

This happened in Geronimo... I had the java: context started with

<gbean name="JavaContext" class="org.apache.geronimo.gjndi.WritableContextGBean">
<attribute name="nameInNamespace">java:</attribute>
</gbean>

and (openjpa) tried to look up java:TransactionManager and I got a stack overflow exception.

After binding something at this name the lookup worked fine.