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You can patch a JBoss installation by dropping the patch zip file onto JBoss Admin console and then follow the ensuing instructions on screen.
12 - Troubleshooting
The startup option -Djavax.xml.transform.TransformerFactory=com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl seems to be necessary only during the Magnolia install phase or it will abort with errors such as
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