class C { static class E extends Exception { } static class E1 extends E { } static class E2 extends E { } static class E3 extends E { } static class MyResource implements AutoCloseable { public MyResource() throws E1 { } public void doSomething() throws E2 { } @Override public void close() throws E3 { } } interface I extends AutoCloseable { } interface Gen extends AutoCloseable { @Override void close() throws E; class Impl implements Gen { @Override public void close() throws E2 { } } } interface GenRT extends Gen { } void m1() { try (MyResource r = new MyResource()) { r.doSomething(); } catch (E1 | E2 | E3 ignore) { } try (MyResource r = new MyResource()) { } catch (E1 | E3 ignore) { } try (MyResource r = new MyResource()) { } catch (E1 e) { } try (MyResource r = new MyResource()) { } catch (E3 e) { } try (MyResource r = new MyResource()) { } try (I r = null) { System.out.println(r); } } void m2() throws Exception { try (Object r = new MyResource()) { } try (AutoCloseable r = "resource") { } } void m3(int p) throws Exception { try (MyResource r = new MyResource()) { r.doSomething(); r = null; int r = 0; } catch (E e) { r = null; } finally { r = null; } r = null; try (MyResource r = new MyResource(); MyResource r = new MyResource()) { } try (MyResource r1 = new MyResource(); MyResource r2 = r1) { } try (MyResource r1 = r2; MyResource r2 = r1) { } MyResource r = null; try (MyResource r = new MyResource()) { } try (MyResource rr = r) { } try (MyResource p = new MyResource()) { } new Runnable() { public void run() { try (MyResource p = new MyResource()) { } catch (E e) { } } }.run(); } void m4() throws Exception { try (MyResource r = r) { } MyResource r; try (MyResource r1 = r) { } } void m5() { try (Gen gen = new Gen.Impl()) { } } void m6() { try (GenRT gen = null) { } } }