Can't start applications in eclipse in debug mode on newly installed mac

Question

I have reinstalled snow leopard (10.6.4) and it's fully updated. Running java -version gives me:
Java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02-279-10M3065)
Java HotSpot(TM) Client VM (build 16.3-b01-279, mixed mode)

I have installed a fresh version of eclipse (helios, 3.6, build: 20100617-1415).

I create a new java project, add a simple test case:

public class TestMyEclipse {  
      @Test  
      public void testIt() {  
       assertTrue(true);  
      }  
}

When I run this in normal mode in eclipse it works as expected. But when I run it in debug mode I get the following error:

Invalid memory access of location 0x14 rip=0x1007f9d22