| /* |
| * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.io.*; |
| import java.util.*; |
| |
| /* |
| * @test |
| * @bug 4202914 4363318 6991528 6998871 |
| * @summary Basic test of serialization of stack trace information |
| * @author Josh Bloch |
| */ |
| |
| public class StackTraceSerialization { |
| public static void main(String args[]) throws Exception { |
| testWithSetStackTrace(); |
| testWithFillInStackTrace(); |
| } |
| |
| private static void testWithSetStackTrace() { |
| StackTraceElement[] stackTrace = {new StackTraceElement("foo", "bar", "baz", -1)}; |
| |
| Throwable t = new TestThrowable(true, false); // Immutable and empty stack |
| assertEmptyStackTrace(t); |
| |
| // Verify fillInStackTrace is now a no-op. |
| t.fillInStackTrace(); |
| assertEmptyStackTrace(t); |
| |
| // Verify setStackTrace is now a no-op. |
| t.setStackTrace(stackTrace); |
| assertEmptyStackTrace(t); |
| |
| // Verify null-handling |
| try { |
| t.setStackTrace(null); |
| throw new RuntimeException("No NPE on a null stack trace."); |
| } catch(NullPointerException npe) { |
| assertEmptyStackTrace(t); |
| } |
| |
| try { |
| t.setStackTrace(new StackTraceElement[]{null}); |
| throw new RuntimeException("No NPE on a null stack trace element."); |
| } catch(NullPointerException npe) { |
| assertEmptyStackTrace(t); |
| } |
| |
| if (!equal(t, reconstitute(t))) |
| throw new RuntimeException("Unequal Throwables with set stacktrace"); |
| |
| Throwable t2 = new Throwable(); |
| t2.setStackTrace(stackTrace); |
| if (!equal(t2, reconstitute(t2))) |
| throw new RuntimeException("Unequal Throwables with set stacktrace"); |
| |
| } |
| |
| private static class TestThrowable extends Throwable { |
| public TestThrowable(boolean enableSuppression, |
| boolean writableStackTrace) { |
| super("the medium", null, |
| enableSuppression, |
| writableStackTrace); |
| } |
| } |
| |
| private static void assertEmptyStackTrace(Throwable t) { |
| if (t.getStackTrace().length != 0) |
| throw new AssertionError("Nonempty stacktrace."); |
| } |
| |
| private static void testWithFillInStackTrace() { |
| Throwable original = null; |
| try { |
| a(); |
| } catch(HighLevelException e) { |
| original = e; |
| } |
| |
| if (!equal(original, reconstitute(original))) |
| throw new RuntimeException("Unequal Throwables with filled-in stacktrace"); |
| } |
| |
| /** |
| * Serialize the argument and return the deserialized result. |
| */ |
| private static Throwable reconstitute(Throwable t) { |
| Throwable result = null; |
| try(ByteArrayOutputStream bout = new ByteArrayOutputStream(); |
| ObjectOutputStream out = new ObjectOutputStream(bout)) { |
| out.writeObject(t); |
| out.flush(); |
| try(ByteArrayInputStream bin = |
| new ByteArrayInputStream(bout.toByteArray()); |
| ObjectInputStream in = new ObjectInputStream(bin)) { |
| result = (Throwable) in.readObject(); |
| } |
| } catch(IOException | ClassNotFoundException e) { |
| throw new RuntimeException(e); |
| } |
| return result; |
| } |
| |
| /** |
| * Returns true if e1 and e2 have equal stack traces and their |
| * causes are recursively equal (by the same definition) and their |
| * suppressed exception information is equals. Returns false or |
| * throws NullPointerExeption otherwise. |
| */ |
| private static boolean equal(Throwable t1, Throwable t2) { |
| return t1==t2 || |
| (Arrays.equals(t1.getStackTrace(), t2.getStackTrace()) && |
| equal(t1.getCause(), t2.getCause()) && |
| Objects.equals(t1.getSuppressed(), t2.getSuppressed())); |
| } |
| |
| static void a() throws HighLevelException { |
| try { |
| b(); |
| } catch(MidLevelException e) { |
| throw new HighLevelException(e); |
| } |
| } |
| static void b() throws MidLevelException { |
| c(); |
| } |
| static void c() throws MidLevelException { |
| try { |
| d(); |
| } catch(LowLevelException e) { |
| throw new MidLevelException(e); |
| } |
| } |
| static void d() throws LowLevelException { |
| e(); |
| } |
| static void e() throws LowLevelException { |
| throw new LowLevelException(); |
| } |
| |
| private static final String OUR_CLASS = StackTraceSerialization.class.getName(); |
| private static final String OUR_FILE_NAME = "StackTraceSerialization.java"; |
| |
| private static void check(StackTraceElement e, String methodName, int n) { |
| if (!e.getClassName().equals(OUR_CLASS)) |
| throw new RuntimeException("Class: " + e); |
| if (!e.getMethodName().equals(methodName)) |
| throw new RuntimeException("Method name: " + e); |
| if (!e.getFileName().equals(OUR_FILE_NAME)) |
| throw new RuntimeException("File name: " + e); |
| if (e.getLineNumber() != n) |
| throw new RuntimeException("Line number: " + e); |
| } |
| } |
| |
| class HighLevelException extends Exception { |
| HighLevelException(Throwable cause) { super(cause); } |
| } |
| |
| class MidLevelException extends Exception { |
| MidLevelException(Throwable cause) { super(cause); } |
| } |
| |
| class LowLevelException extends Exception { |
| } |