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From "Bruce Schuchardt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GEODE-2130) Serialized data generated by DataSerializer.writeObject depends on the type of OutputStream
Date Fri, 18 Nov 2016 18:10:59 GMT

    [ https://issues.apache.org/jira/browse/GEODE-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15677323#comment-15677323
] 

Bruce Schuchardt commented on GEODE-2130:
-----------------------------------------

A simple fix would be to always construct a new ObjectOutputStream in InternalDataSerializer.writeSerializableObject().

> Serialized data generated by DataSerializer.writeObject depends on the type of OutputStream
> -------------------------------------------------------------------------------------------
>
>                 Key: GEODE-2130
>                 URL: https://issues.apache.org/jira/browse/GEODE-2130
>             Project: Geode
>          Issue Type: Bug
>          Components: serialization
>            Reporter: Dan Smith
>
> I hit this with a simple test using DataSerializer to write and read a java Serializable
object.
> The problem I'm seeing is that there is a difference in the serialized form of an object
depending on whether DataSerializer is passed an ObjectOutputStream or just a DataOutputStream.
> With ObjectOutputStream DataSerializer.writeObject just calls writeObject on the underlying
ObjectOutputStream. With DataOutputStream, DataSerializer constructs a new ObjectOutputStream.
> The problem is that the constructor for ObjectOutputStream actually writes two shorts
to the stream. So the serialized form may or may not include those two shorts.
> DataSerializer.readObject expects to read those two shorts, because it constructs a DSObjectInputStream
unless the input is already a DSObjectInputStream.
> Because of that, just writing and reading an object and result in an EOFException:
> {noformat}
> java.io.EOFException
> 	at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2353)
> 	at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2822)
> 	at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:804)
> 	at java.io.ObjectInputStream.<init>(ObjectInputStream.java:301)
> 	at org.apache.geode.internal.InternalDataSerializer$DSObjectInputStream.<init>(InternalDataSerializer.java:3583)
> 	at org.apache.geode.internal.InternalDataSerializer.basicReadObject(InternalDataSerializer.java:2988)
> 	at org.apache.geode.DataSerializer.readObject(DataSerializer.java:3281)
> 	at DataSerializerJUnitTest.test(DataSerializerJUnitTest.java:20)
> {noformat}
> Here's a simple test of this issue:
> {code}
> import org.apache.geode.DataSerializer;
> import org.junit.Test;
> import java.io.ByteArrayInputStream;
> import java.io.ByteArrayOutputStream;
> import java.io.IOException;
> import java.io.ObjectInputStream;
> import java.io.ObjectOutputStream;
> import java.io.Serializable;
> public class DataSerializerJUnitTest {
>   @Test
>   public void test() throws IOException, ClassNotFoundException {
>     final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
>     ObjectOutputStream out = new ObjectOutputStream(byteArrayOutputStream);
>     DataSerializer.writeObject(new MyObject(), out);
>     out.close();
>     ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(byteArrayOutputStream.toByteArray()));
>     final Object object = DataSerializer.readObject(in);
>   }
>   private static class MyObject implements Serializable {
>   }
> }
> {code}



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