High CPU in org.jdom.Namespace.getNamespace()

Issue

• JBoss consumed high CPU in threads making the following org.jdom.Namespace.getNamespace() calls:

 "127.0.0.1:8009-1" daemon prio=10 tid=0x00007faf1001c000 nid=0x6e3a runnable [0x00007faeb3efc000]
    java.lang.Thread.State: RUNNABLE
    at java.util.HashMap.getEntry(HashMap.java:446)
    at java.util.HashMap.get(HashMap.java:405)
    at org.jdom.Namespace.getNamespace(Namespace.java:148)
    at org.jdom.input.SAXHandler.startPrefixMapping(SAXHandler.java:471)
    at org.apache.xerces.parsers.AbstractSAXParser.startNamespaceMapping(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.jdom.input.SAXBuilder.build(SAXBuilder.java:453)
    at org.jdom.input.SAXBuilder.build(SAXBuilder.java:851)