The specific problem is with Icedtea. This is the error output:

IcedTea-Web Plugin version: 1.6.1
Thu Nov 12 16:59:23 BRST 2015
net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Could not initialize applet. For more information click "more information button".
        at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:764)
        at net.sourceforge.jnlp.Launcher.getApplet(Launcher.java:686)
        at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:933)
Caused by: net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Unknown Main-Class. Could not determine the main class for this application. at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:701)
        at 
net.sourceforge.jnlp.runtime.JNLPClassLoader.(JNLPClassLoader.java:285)
at net.sourceforge.jnlp.runtime.JNLPClassLoader.createInstance(JNLPClassLoader.java:357) at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:429) at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:403)
        at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:729)
        ... 2 more
Caused by: java.lang.ClassNotFoundException: Could not find class JavaDetection at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClassNonRecursive(JNLPClassLoader.java:2530) at net.sourceforge.jnlp.runtime.JNLPClassLoader.findClass(JNLPClassLoader.java:1682) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClass(JNLPClassLoader.java:2543) at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:698)
        ... 7 more
Caused by: java.security.PrivilegedActionException: java.lang.ClassNotFoundException: JavaDetection
        at java.security.AccessController.doPrivileged(Native Method)
at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClassNonRecursive(JNLPClassLoader.java:2520)
        ... 10 more
Caused by: java.lang.ClassNotFoundException: JavaDetection
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.access$2001(JNLPClassLoader.java:2492) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader$1.run(JNLPClassLoader.java:2523) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader$1.run(JNLPClassLoader.java:2521)
        ... 12 more

 Chain:
1) at Thu Nov 12 16:59:20 BRST 2015
net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Unknown Main-Class. Could not determine the main class for this application. at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:701)
        at 
net.sourceforge.jnlp.runtime.JNLPClassLoader.(JNLPClassLoader.java:285)
at net.sourceforge.jnlp.runtime.JNLPClassLoader.createInstance(JNLPClassLoader.java:357) at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:429) at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:403)
        at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:729)
        at net.sourceforge.jnlp.Launcher.getApplet(Launcher.java:686)
        at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:933)
Caused by: java.lang.ClassNotFoundException: Could not find class JavaDetection at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClassNonRecursive(JNLPClassLoader.java:2530) at net.sourceforge.jnlp.runtime.JNLPClassLoader.findClass(JNLPClassLoader.java:1682) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClass(JNLPClassLoader.java:2543) at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:698)
        ... 7 more
Caused by: java.security.PrivilegedActionException: java.lang.ClassNotFoundException: JavaDetection
        at java.security.AccessController.doPrivileged(Native Method)
at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClassNonRecursive(JNLPClassLoader.java:2520)
        ... 10 more
Caused by: java.lang.ClassNotFoundException: JavaDetection
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.access$2001(JNLPClassLoader.java:2492) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader$1.run(JNLPClassLoader.java:2523) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader$1.run(JNLPClassLoader.java:2521)
        ... 12 more
2) at Thu Nov 12 16:59:20 BRST 2015
net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Could not initialize applet. For more information click "more information button".
        at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:764)
        at net.sourceforge.jnlp.Launcher.getApplet(Launcher.java:686)
        at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:933)
Caused by: net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Unknown Main-Class. Could not determine the main class for this application. at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:701)
        at 
net.sourceforge.jnlp.runtime.JNLPClassLoader.(JNLPClassLoader.java:285)
at net.sourceforge.jnlp.runtime.JNLPClassLoader.createInstance(JNLPClassLoader.java:357) at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:429) at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:403)
        at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:729)
        ... 2 more
Caused by: java.lang.ClassNotFoundException: Could not find class JavaDetection at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClassNonRecursive(JNLPClassLoader.java:2530) at net.sourceforge.jnlp.runtime.JNLPClassLoader.findClass(JNLPClassLoader.java:1682) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClass(JNLPClassLoader.java:2543) at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:698)
        ... 7 more
Caused by: java.security.PrivilegedActionException: java.lang.ClassNotFoundException: JavaDetection
        at java.security.AccessController.doPrivileged(Native Method)
at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.findClassNonRecursive(JNLPClassLoader.java:2520)
        ... 10 more
Caused by: java.lang.ClassNotFoundException: JavaDetection
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader.access$2001(JNLPClassLoader.java:2492) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader$1.run(JNLPClassLoader.java:2523) at net.sourceforge.jnlp.runtime.JNLPClassLoader$CodeBaseClassLoader$1.run(JNLPClassLoader.java:2521)
        ... 12 more

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