大名鼎鼎的java动态脚本语言。已经通过了sun的认证

				class UnsafeNavigationTest extends GroovyTestCase {								    void testUnsafePropertyNavigations() {				        def x = null				        				        try {				            def y = x.foo				            fail("should fail")				        }				        catch (NullPointerException e) {				            assert e != null				        }				    }				}