org.jboss.mx.metadata.XMBeanEntityResolver ignores systemId

The XMBeanEntityResolver completely ignores systemId and logs an error when publicId is null.

This produces bogus errors in the console/log when trying to import external entities in the xmbean descriptor, e.g:

<!DOCTYPE mbean PUBLIC
"-//JBoss//DTD JBOSS XMBEAN 1.1//EN"
"http://www.jboss.org/j2ee/dtd/jboss_xmbean_1_1.dtd"
[
<!ENTITY operations SYSTEM "operations.ent">
]>
<mbean>
...
&operations;
...
</mbean>

The error is harmless, since the return 'null' value cause the correct lookup of the external entity.

A workaround is to just filter out XMBeanEntityResolver errors from conf/log4j.xml:

<category name="org.jboss.mx.metadata.XMBeanEntityResolver">
<priority value="FATAL"/>
</category>