This test does the following:

1. Client calls ejb1.method1() <tx attrib RequiresNew>
    ->method1() { do getConnection }
2. ejb1 calls ejb2.method2() <tx attrib RequiresNew>
    -> method2() { do getConnection }
3. ejb2 calls ejb3.method3() <tx attrib Supports>
    -> method3() { do getConnection }