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/*
* 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 {
}
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