If you are using XBean to parse the XML configurations, the XML validation is optional so you do not need to specify the XML Schema Locations. However if you are using Spring's 2.0 XML handling to parse the XML then you need to refer to the XSD locations in your XML document because Spring uses schema namespace or schema location to resolve namespace handlers. Without correct namespace definition you will get messages like below:

Unable to locate NamespaceHandler for namespace [http://activemq.org/config/1.0\]

You can refer to a specific version of the XSD in your XML as follows

or if you prefer you can use a generic XSD without the version number Your IDE won't be able to fetch this XSD, you'll have to manually associate a specific release; however it does mean that you won't have to upgrade your XML config file with each ActiveMQ release; as it will resolve this XSD using the bundled XSD inside the activemq-core.jar. ### Pay attention to the namespace If you use ActiveMQ 5.0 or earlier you XML namespace definition should point to `[http://activemq.org/config/1.0](http://activemq.org/config/1.0)` . If you use ActiveMQ 5.1 or later the namespace should point to `[http://activemq.apache.org/schema/core](http://activemq.apache.org/schema/core)` . **ActiveMQ 5.2 example**

ActiveMQ 5.0 example

Both examples above are almost the same. Only one difference is xml namespace. You can find more information about the namespace change on activemq-dev topic: ActiveMQ namespace change.

Schema Validation

Note: The xml configuration ordering constraint is removed in 5.6, the broker element

Alphabetically Ordered XML Elements (5.4 - 5.5.1)

XMLSchema:sequence is replaced with an XMLSchema:all

Note: from version 5.4.2, you can disable validation from the command line by appending a query parameter to the xbean url. This will allow you to reuse your existing xml configuration 'as is' if needed.

bin/activemq console xbean:conf/activemq.xml?validate=false

Beginning in ActiveMQ 5.4, the XML elements inside the <broker> element must be ordered alphabetically. If you look at the XSD, this has always been the case with ActiveMQ. The difference in 5.4 is that the XML configuration is actually being validated against the XML schema.

For example, the following XML configuration did not present a problem in ActiveMQ 5.3.x:

<?xml version="1.0"?>

However, in ActiveMQ 5.4, the XML configuration above would cause an exception similar to the following:

To avoid this XML validation error in ActiveMQ 5.4, simply change the ordering of the XML elements so that they are in alphabetical order. Below is an example of the same XML configuration but in alphabetical order:

<?xml version="1.0"?>

Configurations can be easily tested against ActiveMQ 5.4 using the ActiveMQ startup script. Below is an example:

$ cd $ACTIVEMQ_HOME
$ ./bin/activemq console xbean:file:/Users/bsnyder/SpringSource/clients/Finra/activemq-example-unordered.xml
INFO: Using default configuration
(you can configure options in one of these file: /etc/default/activemq /Users/bsnyder/.activemqrc)

INFO: Invoke the following command to create a configuration file
./bin/activemq setup [ /etc/default/activemq | /Users/bsnyder/.activemqrc ]

INFO: Using java '/System/Library/Frameworks/JavaVM.framework/Home/bin/java'
INFO: Starting in foreground, this is just for debugging purposes (stop process by pressing CTRL+C)
Java Runtime: Apple Inc. 1.6.0_20 /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home
Heap sizes: current=258880k free=253106k max=258880k
JVM args: -Xms256M -Xmx256M -Dorg.apache.activemq.UseDedicatedTaskRunner=true -Djava.util.logging.config.file=logging.properties -Dcom.sun.management.jmxremote -Dactivemq.classpath=/Users/bsnyder/amq/apache-activemq-5.4.1/conf; -Dactivemq.home=/Users/bsnyder/amq/apache-activemq-5.4.1 -Dactivemq.base=/Users/bsnyder/amq/apache-activemq-5.4.1
ACTIVEMQ_HOME: /Users/bsnyder/amq/apache-activemq-5.4.1
ACTIVEMQ_BASE: /Users/bsnyder/amq/apache-activemq-5.4.1
Loading message broker from: xbean:file:/Users/bsnyder/SpringSource/clients/Finra/activemq-example-unordered.xml
...

Xml Reference

ActiveMQ Xml Reference

Released Schemas

Using the XSDs in configuration files

Schema Validation

Alphabetically Ordered XML Elements (5.4 - 5.5.1)

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