Periodic build error messages

While building STM today I've seen the following build-time errors several times. Since I've not seen them at all before and it's been a few weeks since I last built the system, I wonder if these are known issues?

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.065 sec
Running com.hp.mwtests.ts.txoj.concurrencycontrol.LockConflictUnitTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 15.605 sec
Error occurred during initialization of VM
Too small initial heap for new size specified
Error occurred during initialization of VM
Too small initial heap for new size specified
Error occurred during initialization of VM
Too small initial heap for new size specified

And then in separate build attempts ...

Running com.hp.mwtests.ts.arjuna.objectstore.JDBCStoreTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.428 sec <<< FAILURE!
testStateMachine(com.hp.mwtests.ts.arjuna.objectstore.JDBCStoreTest) Time elapsed: 0.372 sec <<< ERROR!
java.lang.OutOfMemoryError: Java heap space
at com.hp.mwtests.ts.arjuna.objectstore.JDBCStoreTest.testStateMachine(JDBCStoreTest.java:95)

Builds do complete most of the time, so retrying the build is an option. But it's inconvenient.