Lenovo SR645 Server's XCC interface not working after icedtea-web update.

Issue

• After updating icedtea-web access to icedtea-web-1.8.4-4.el8, the Java console of the Lenovo SR645 server (XClarity Controller aka. XCC) interface does not work.
• The javaws from icedtea-web-1.8.4 is unable to start the Java console of Lenovo XCC because of issues in javaws caching mechanism.
• Trying to access Lenovo XCC interface (hardware server remote management) from a Red Hat Enterprise Linux 8 host leads to errors as below:

   # javaws -jnlp Downloads/rp.jnlp 

   Unable to use Firefox's proxy settings. Using "DIRECT" as proxy type.
   JAR https://XX.X.X.XXX/JavaRP/avctKVM.jar not found. Continuing.
   JAR https://XX.X.X.XXX/JavaRP/avctKVMIOLinux64.jar not found. Continuing.
   JAR https://XX.X.X.XXX/JavaRP/avctVMAPI_DLLLinux64.jar not found. Continuing.
   JAR https://XX.X.X.XXX/JavaRP/avctKVM.jar not found. Continuing.
   JAR https://XX.X.X.XXX/JavaRP/avctKVMIOLinux64.jar not found. Continuing.
   JAR https://XX.X.X.XXX/JavaRP/avctVMAPI_DLLLinux64.jar not found. Continuing.
   netx: Initialization Error: Could not initialize application. (Fatal: Initialization Error: Unknown Main-Class. 
   Could not determine the main class for this application.)
   net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Could not initialize application. The 
   application has not been initialized, for more information execute javaws from the command line.
       at net.sourceforge.jnlp.Launcher.createApplication(Launcher.java:823)
       at net.sourceforge.jnlp.Launcher.launchApplication(Launcher.java:531)
       at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:946)
   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:776)
       at net.sourceforge.jnlp.runtime.JNLPClassLoader.<init>(JNLPClassLoader.java:338)
       at net.sourceforge.jnlp.runtime.JNLPClassLoader.createInstance(JNLPClassLoader.java:421)
       at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:495)
       at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:468)
       at net.sourceforge.jnlp.Launcher.createApplication(Launcher.java:815)
       ... 2 more