I just tried to run Java Web Start Application in my Ubuntu Box and it threw this error.
net.sourceforge.nanoxml.XMLParseException: XML Parse Exception during parsing of the XML definition at line 5: Unexpected end of data reached
at net.sourceforge.nanoxml.XMLElement.unexpectedEndOfData(XMLElement.java:1169)
at net.sourceforge.nanoxml.XMLElement.readChar(XMLElement.java:940)
at net.sourceforge.nanoxml.XMLElement.skipSpecialTag(XMLElement.java:878)
at net.sourceforge.nanoxml.XMLElement.sanitizeInput(XMLElement.java:1293)
at net.sourceforge.jnlp.Parser$1.run(Parser.java:959)
at java.lang.Thread.run(Thread.java:636)
netx: Invalid XML document syntax.
Solution found was as following
java -jar /usr/share/java/netx.jar -jnlp "and-the-jnlp-path-here