JHotDrawPlugin with IcedTea-Web (RHEL6)

We are having trouble using the JHotDrawPlugin on SL6 (based on RHEL6), while we have no problems with SL5 or SL4. I believe the main issue is that RHEL6 provides OpenJDK (and IcedTea-web) instead of Oracle's JDK.

On SL5 and SL4, everything works fine.

If I try to run jhotdraw.jar using javaws on SL6 (provided by IcedTea-web), however, I recieve a "Fatal: Read Error: Could not read or parse the JNLP file." The details of the error are as follows:

net.sourceforge.jnlp.LaunchException: Fatal: Read Error: Could not read or parse the JNLP file.
        at net.sourceforge.jnlp.Launcher.fromUrl(Launcher.java:491)
        at net.sourceforge.jnlp.Launcher.launch(Launcher.java:283)
        at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:199)
        at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:51)
        at java.security.AccessController.doPrivileged(Native Method)
        at net.sourceforge.jnlp.runtime.Boot.main(Boot.java:165)
Caused by: net.sourceforge.jnlp.ParseException: Invalid XML document syntax.
        at net.sourceforge.jnlp.Parser.getRootNode(Parser.java:1251)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:177)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:162)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:148)
        at net.sourceforge.jnlp.Launcher.fromUrl(Launcher.java:477)
        ... 5 more
Caused by: net.sourceforge.nanoxml.XMLParseException: XML Parse Exception during parsing of the XML definition at line 1: Expected: '<' but got: 'P'
        at net.sourceforge.nanoxml.XMLElement.expectedInput(XMLElement.java:1143)
        at net.sourceforge.nanoxml.XMLElement.parseFromReader(XMLElement.java:503)
        at net.sourceforge.nanoxml.XMLElement.parseFromReader(XMLElement.java:464)
        at net.sourceforge.jnlp.Parser.getRootNode(Parser.java:1247)
        ... 9 more
Caused by: 
net.sourceforge.jnlp.ParseException: Invalid XML document syntax.
        at net.sourceforge.jnlp.Parser.getRootNode(Parser.java:1251)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:177)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:162)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:148)
        at net.sourceforge.jnlp.Launcher.fromUrl(Launcher.java:477)
        at net.sourceforge.jnlp.Launcher.launch(Launcher.java:283)
        at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:199)
        at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:51)
        at java.security.AccessController.doPrivileged(Native Method)
        at net.sourceforge.jnlp.runtime.Boot.main(Boot.java:165)
Caused by: net.sourceforge.nanoxml.XMLParseException: XML Parse Exception during parsing of the XML definition at line 1: Expected: '<' but got: 'P'
        at net.sourceforge.nanoxml.XMLElement.expectedInput(XMLElement.java:1143)
        at net.sourceforge.nanoxml.XMLElement.parseFromReader(XMLElement.java:503)
        at net.sourceforge.nanoxml.XMLElement.parseFromReader(XMLElement.java:464)
        at net.sourceforge.jnlp.Parser.getRootNode(Parser.java:1247)
        ... 9 more
Caused by: 
net.sourceforge.nanoxml.XMLParseException: XML Parse Exception during parsing of the XML definition at line 1: Expected: '<' but got: 'P'
        at net.sourceforge.nanoxml.XMLElement.expectedInput(XMLElement.java:1143)
        at net.sourceforge.nanoxml.XMLElement.parseFromReader(XMLElement.java:503)
        at net.sourceforge.nanoxml.XMLElement.parseFromReader(XMLElement.java:464)
        at net.sourceforge.jnlp.Parser.getRootNode(Parser.java:1247)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:177)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:162)
        at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:148)
        at net.sourceforge.jnlp.Launcher.fromUrl(Launcher.java:477)
        at net.sourceforge.jnlp.Launcher.launch(Launcher.java:283)
        at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:199)
        at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:51)
        at java.security.AccessController.doPrivileged(Native Method)
        at net.sourceforge.jnlp.runtime.Boot.main(Boot.java:165)

Any suggestions for using the JHotDrawPlugin with IcedTea-web would be greatly appreciated.

-- DevinBougie - 28 Feb 2012

Looks like the problem is that the JNLP is not valid XML:

http://icedtea.classpath.org/wiki/IcedTea-Web#Invalid_XML

-- DevinBougie - 28 Feb 2012

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