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From "Marcel Casado (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3387) Backards imcompatibilitiy with version 5.3 and previous with the http protocol due chage on charset encoding
Date Sun, 03 Jul 2011 06:42:21 GMT
Backards imcompatibilitiy with version 5.3 and previous with the http protocol due chage on
charset encoding
------------------------------------------------------------------------------------------------------------

                 Key: AMQ-3387
                 URL: https://issues.apache.org/jira/browse/AMQ-3387
             Project: ActiveMQ
          Issue Type: Bug
          Components: Transport
    Affects Versions: 5.5.0, 5.4.2, 5.4.0
            Reporter: Marcel Casado


Changes in charset encoding from java modified UTF-8 to standard UTF-8 in class org.apache.activemq.transport.util.TextWireFormat
makes clients and broker using different versions not compatible when using http transport
protocol. Like a client 5.3 and broker 5.5 can not interchange messages in http transport
protocol or the other way around. Backards compatibility support could be easily provided
with :

   public Object unmarshal(DataInput in) throws IOException {

    	String value;
    	try {
    		int length = in.readInt();
    		byte[] utf8 = new byte[length];
    		in.readFully(utf8);
    		value = new String(utf8, "UTF-8");
    		return unmarshalText(value);
    	} catch(Exception ex) {
    		DataByteArrayInputStream dbais = (DataByteArrayInputStream) in;
    		dbais.restart(0);
    		value = dbais.readUTF();
    		return unmarshalText(value); 
    	}    
    }


    and in HttpClientTransport calling unmarshal with a DataByteArrayInputStream:

    DataByteArrayInputStream stream = new DataByteArrayInputStream(httpMethod.getResponseBody());
    Object command = (Object)getTextWireFormat().unmarshal(stream);


    With this changes was able to connect legacy clients 5.3 to new 5.5 brokers.


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