1 /* 2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 7020047 27 * @summary Test null handling of try-with-resources statement 28 */ 29 30 public class TwrNullTests { 31 /* 32 * Each try-with-resources statement generates two calls to the 33 * close method for each resource: one for when there is a primary 34 * exception present and the second for when a primary exception 35 * is absent. The null handling of both cases needs to be 36 * checked. 37 */ 38 public static void main(String... args) { 39 testNormalCompletion(); 40 testNoSuppression(); 41 } 42 43 /* 44 * Verify empty try-with-resources on a null resource completes 45 * normally; no NPE from the generated close call. 46 */ 47 private static void testNormalCompletion() { 48 try(AutoCloseable resource = null) { 49 return; // Nothing so see here, move along. 50 } catch (Exception e) { 51 throw new AssertionError("Should not be reached", e); 52 } 53 } 54 55 /* 56 * Verify that a NPE on a null resource is <em>not</em> added as a 57 * suppressed exception to an exception from try block. 58 */ 59 private static void testNoSuppression() { 60 try(AutoCloseable resource = null) { 61 throw new java.io.IOException(); 62 } catch(java.io.IOException ioe) { 63 Throwable[] suppressed = ioe.getSuppressed(); 64 if (suppressed.length != 0) { 65 throw new AssertionError("Non-empty suppressed exceptions", 66 ioe); 67 } 68 } catch (Exception e) { 69 throw new AssertionError("Should not be reached", e); 70 } 71 } 72 }