NullPointerException when using MockConnection with DSLContext.transaction()

[lukaseder]

The following logic throws a NPE:

DSLContext e = DSL.using(new MockConnection(new EmptyResult()), SQLDialect.H2);

e.transaction(new TransactionalRunnable() {

    @Override
    public void run(Configuration configuration) throws Exception {
        Result<Record> result = DSL.using(configuration).fetch("select ?, ? from dual", 1, 2);

        assertEquals(0, result.size());
        assertEquals(3, result.fields().length);
        for (int i = 0; i < 3; i++) {
            assertEquals(TABLE1.field(i).getName(), result.field(i).getName());
            assertEquals(TABLE1.field(i).getType(), result.field(i).getType());
        }
    }
});

The exception being:

java.lang.NullPointerException
    at java.util.ArrayDeque.addFirst(ArrayDeque.java:228)
    at java.util.ArrayDeque.push(ArrayDeque.java:503)
    at org.jooq.impl.DefaultTransactionProvider.begin(DefaultTransactionProvider.java:155)
    at org.jooq.impl.DefaultDSLContext.transactionResult(DefaultDSLContext.java:363)
    at org.jooq.impl.DefaultDSLContext.transaction(DefaultDSLContext.java:392)
    at org.jooq.test.MockTest.testEmptyResultWithTransaction(MockTest.java:135)