Unable to use address strings with java client due to NPE
---------------------------------------------------------

                 Key: QPID-3760
                 URL: https://issues.apache.org/jira/browse/QPID-3760
             Project: Qpid
          Issue Type: Bug
          Components: Java Client
    Affects Versions: 0.10
            Reporter: Sergey Zhemzhitsky


Stacktrace:

{code}
Exception in thread "Thread-5" java.lang.NullPointerException
        at org.apache.qpid.client.AMQDestination.equals(AMQDestination.java:577)
        at 
org.springframework.jms.connection.CachingConnectionFactory$DestinationCacheKey.destinationEquals(CachingConnectionFactory.java:467)
        at 
org.springframework.jms.connection.CachingConnectionFactory$DestinationCacheKey.equals(CachingConnectionFactory.java:474)
        at java.util.HashMap.get(HashMap.java:385)
        at 
org.springframework.jms.connection.CachingConnectionFactory$CachedSessionInvocationHandler.getCachedProducer(CachingConnectionFactory.java:353)
        at 
org.springframework.jms.connection.CachingConnectionFactory$CachedSessionInvocationHandler.invoke(CachingConnectionFactory.java:320)
        at $Proxy1.createProducer(Unknown Source)
{code}

Exception happens for the following address:
{code}
JbenchQueue;{create: always, node: {type:queue}}
{code}

It seems the qpid java client tries to obtain exchangeClass property in 
AMQDestination.equals method, but this property is not set when using address 
strings.

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