$ /usr/lib/icedtea-web/javaws launch.jnlp 
selected jre: /usr/lib/jvm/jre
WARNING: package javax.jnlp not in java.desktop
Exception in thread "Thread-0" java.lang.NoClassDefFoundError: Could not initialize class sun.awt.SunToolkit
        at java.desktop/sun.awt.AppContext$2.run(AppContext.java:282)
        at java.desktop/sun.awt.AppContext$2.run(AppContext.java:271)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at java.desktop/sun.awt.AppContext.initMainAppContext(AppContext.java:271)
        at java.desktop/sun.awt.AppContext$3.run(AppContext.java:326)
        at java.desktop/sun.awt.AppContext$3.run(AppContext.java:309)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at java.desktop/sun.awt.AppContext.getAppContext(AppContext.java:308)
        at java.desktop/javax.imageio.spi.IIORegistry.getDefaultInstance(IIORegistry.java:129)
        at net.sourceforge.jnlp.config.DeploymentConfiguration.<init>(DeploymentConfiguration.java:105)
        at net.sourceforge.jnlp.config.DeploymentConfiguration.<init>(DeploymentConfiguration.java:96)
        at net.sourceforge.jnlp.runtime.JNLPRuntime$DeploymentConfigurationHolder.<clinit>(JNLPRuntime.java:451)
        at net.sourceforge.jnlp.runtime.JNLPRuntime.getConfiguration(JNLPRuntime.java:481)
        at net.sourceforge.jnlp.util.logging.LogConfig.<init>(LogConfig.java:61)
        at net.sourceforge.jnlp.util.logging.LogConfig.<init>(LogConfig.java:48)
        at net.sourceforge.jnlp.util.logging.LogConfig$LogConfigHolder.<clinit>(LogConfig.java:91)
        at net.sourceforge.jnlp.util.logging.LogConfig.getLogConfig(LogConfig.java:95)
        at net.sourceforge.jnlp.util.logging.OutputController.consume(OutputController.java:106)
        at net.sourceforge.jnlp.util.logging.OutputController.flush(OutputController.java:99)
        at java.base/java.lang.Thread.run(Thread.java:829)