ActiveMQ CLIENT on Java 1.4 <p>We are using Active MQ in the most current version 5.6.0. Now we have the problem that a new client has to be connected, unfortunately this client is developed with IBM JDK 1.4. Adding ActiveMQ to the application lead to the following error: </p> <pre><code>UNEXPECTED ERROR OCCURRED: org/apache/activemq/ActiveMQConnectionFactory (Unsupported major.minor version 50.0) STACK TRACE: java.lang.UnsupportedClassVersionError: org/apache/activemq/ActiveMQConnectionFactory (Unsupported major.minor version 50.0) </code></pre> <p>We don't want to switch to an older ActiveMQ version, since there are other applications using the current version. Now my questions (I know the FAQ and especially <a href="http://activemq.apache.org/can-i-use-activemq-5x-or-later-on-java-14.html" rel="nofollow">http://activemq.apache.org/can-i-use-activemq-5x-or-later-on-java-14.html</a>):</p> <p>Are there any ActiveMQ client jars which are usable to connect to Active MQ 5.6.0? For example is it possible to use an ActiveMQ 4.0 client to connect to Active MQ 5.6.0? Is it possible to use any other protocol for this purpose? Has anyone a succesful solution running?</p> <p>If I have to use retrotranslator which is the minimum set on jars I have to translate? Has anyone the experience with IBM JDK 1.4? </p> <p>Thanks for your answers!</p>