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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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104
test/jdk/java/io/Externalizable/definesWriteObject/DefinesWriteObject.java Normal file
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/*
* Copyright (c) 1998, 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.
*/
/*
* @test
* @bug 4151469
* @summary Write and read an Externalizable class that defines writeObject.
* There was some confusion over writeObject method needing
* to be defined by an Externalizable class. It does not
* need to exist, but Externalizable class should work correctly
* if the member exists.
*/
import java.io.*;
public class DefinesWriteObject implements Externalizable {
private int intData = 4;
private Object objData = new String("hello");
public DefinesWriteObject() {
}
public DefinesWriteObject(int i, Object o) {
intData = i;
objData = o;
}
/**
* There was some confusion over writeObject method needing
* to be defined by an Externalizable class. It does not
* need to exist, but Externalizable class should work correctly
* if the member exists.
*/
private void writeObject(ObjectOutputStream out) throws IOException {
}
/**
* @serialData Writes an integer, Object.
*/
public void writeExternal(ObjectOutput out)
throws IOException
{
out.writeInt(intData);
out.writeObject(objData);
}
public void readExternal(ObjectInput in)
throws IOException, ClassNotFoundException
{
intData = in.readInt();
objData = in.readObject();
}
public static void main(String args[])
throws IOException, ClassNotFoundException
{
DefinesWriteObject obj1 = new DefinesWriteObject(5, "GoodBye");
DefinesWriteObject obj2 = new DefinesWriteObject(6, "AuRevoir");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(obj1);
oos.writeObject(obj2);
oos.close();
ByteArrayInputStream bais =
new ByteArrayInputStream(baos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bais);
DefinesWriteObject readObject1 = (DefinesWriteObject)ois.readObject();
DefinesWriteObject readObject2 = (DefinesWriteObject)ois.readObject();
ois.close();
// verify that deserialize data matches objects serialized.
if (obj1.intData != readObject1.intData ||
obj2.intData != readObject2.intData) {
throw new Error("Unexpected mismatch between integer data written and read.");
}
if ( ! ((String)obj1.objData).equals((String)readObject1.objData) ||
! ((String)obj2.objData).equals((String)readObject2.objData)) {
throw new Error("Unexpected mismatch between String data written and read.");
}
}
};