I have two tests to check the expected exception throw. I am using Junit 4 and has following syntax.

@Test(expected=IllegalArgumentException.class)
public void testSomething(){
..........
}

One of the tests fail even though IllegalArgumentException is thrown and the other passes. Any idea whats missing?? I modified the test which is failing to following and it passes.

public void testSomething(){
 try{
  ............ //line that throws exception
  fail();
 }catch(IllegalArgumentException e) {
 }
}