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Serialization Problem when using HashMap
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Ian Bentley  
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 More options Jan 24 2011, 6:09 pm
From: Ian Bentley <ian.bent...@gmail.com>
Date: Mon, 24 Jan 2011 18:09:16 -0500
Local: Mon, Jan 24 2011 6:09 pm
Subject: [jruby-user] Serialization Problem when using HashMap
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I'm using JRuby in a Rails application, which is supported by a Java
backend.  One of the Java Interface functions requires a hashmap be passed
from the JRuby to the Ruby code, and I'm running into an unexpected
RuntimeException in this case.

The Hashmap construction is very straightforward:

def java_map
    hash_map = ::Java::JavaUtil::HashMap.new
    hash_map[:original_document_uri] = "".to_s
end

This construction causes no errors in JRuby, and I can nicely access the map
as expected.

The trouble comes when I attempt to pass this map into Java:

NativeException (java.lang.RuntimeException:
org.jcodings.specific.ASCIIEncoding):
  org/apache/activemq/command/ActiveMQObjectMessage.java:111:in
`storeContent'
  org/apache/activemq/command/ActiveMQObjectMessage.java:162:in `setObject'
  org/apache/activemq/ActiveMQSession.java:380:in `createObjectMessage'
  org/logicblaze/lingo/jms/marshall/DefaultMarshaller.java:60:in
`createRequestMessage'
  org/logicblaze/lingo/jms/JmsClientInterceptor.java:131:in `invoke'
  net/zerofootprint/jms/JmsProxyFactoryBean.java:58:in `invoke'
  org/springframework/aop/framework/ReflectiveMethodInvocation.java:172:in
`proceed'
  org/springframework/aop/framework/JdkDynamicAopProxy.java:202:in `invoke'
  $Proxy15:-1:in ...(I've removed my application specific details here, as
they seem unimportant)

That is the stacktrace that I get on my rails log, and in my java log I get:

java.lang.RuntimeException: org.jcodings.specific.ASCIIEncoding
          ... (similar trace to above)
Caused by: java.io.NotSerializableException:
org.jcodings.specific.ASCIIEncoding
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400 )
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400 )
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
 at java.util.HashMap.writeObject(HashMap.java:1000)
        ... (far too long for inclusion)

As you can see, I am using ActiveMQ as my broker, and have the java running
in a Tomcat instance, while the JRuby is running inside Trinidad.

I'm not sure if the HashMap here is a red herring, but it seems that
whatever I put into the hashmap causes this exception.

Finally, I tried using an empty hashmap, and that seemed to work ok.

I hope someone can lend me a bright Idea.

--
Ian Bentley


 
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Paweł Wielgus  
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 More options Jan 25 2011, 5:15 am
From: Paweł Wielgus <poulw...@gmail.com>
Date: Tue, 25 Jan 2011 11:15:05 +0100
Local: Tues, Jan 25 2011 5:15 am
Subject: Re: [jruby-user] Serialization Problem when using HashMap
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Hi Ian,
something You put into the hashmap is using org.jcodings.specific.ASCIIEncoding
so while serializing your map You get:
Caused by: java.io.NotSerializableException: org.jcodings.specific.ASCIIEncoding
and that's why empty map works.

Best greetings,
Paweł Wielgus.

2011/1/25 Ian Bentley <ian.bent...@gmail.com>:

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Ian Bentley  
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 More options Jan 25 2011, 9:12 am
From: Ian Bentley <ian.bent...@gmail.com>
Date: Tue, 25 Jan 2011 09:12:20 -0500
Local: Tues, Jan 25 2011 9:12 am
Subject: Re: [jruby-user] Serialization Problem when using HashMap
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Pawel,

Thanks for getting back.  That was my belief, but I couldn't understand why

    hash_map[:original_document_uri] = "".to_s

would be causing that error.  It turns out that it's the symbol on the lhs
which causes the problem.

Thanks,
Ian

2011/1/25 Paweł Wielgus <poulw...@gmail.com>

--
Ian Bentley

 
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