When using jconsole from the JDK something like this:

$JAVA_HOME/bin/jconsole -J-Djava.class.path=$JAVA_HOME/lib/jconsole.jar:$JAVA_HOME/lib/tools.jar:./jboss-cli-client.jar -J-Djava.util.logging.config.file=logging-jconsole.properties

The org.jboss.as.cli.gui.GuiMain makes a call to locate a product specific image:

java.net.URL iconURL = org/jboss/as/cl/gui/GuiMain.getResource(getCliIconPath());

getCliIconPath() is looking in JBOSS_HOME to identify which product this is to return a product specific image it appears.

ProductConfig productConfig = new ProductConfig(Module.getBootModuleLoader(), System.getenv("JBOSS_HOME"), null);
iconPath = productConfig.getCliIcon();

We have seen a case when JBOSS_HOME is not set and jconsole is used from the JDK with jboss-cli-client.jar on the classpath that it causes a NPE.  We should check for null and either use a default image from the client jar or such.

Caused by: java.lang.NullPointerException
	at sun.misc.MetaIndex.mayContain(MetaIndex.java:243)
	at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:830)
	at sun.misc.URLClassPath.getResource(URLClassPath.java:199)
	at sun.misc.URLClassPath.getResource(URLClassPath.java:251)
	at java.lang.ClassLoader.getBootstrapResource(ClassLoader.java:1305)
	at java.lang.ClassLoader.getResource(ClassLoader.java:1144)
	at java.lang.ClassLoader.getResource(ClassLoader.java:1142)
	at java.lang.Class.getResource(Class.java:2147)
	at org.jboss.as.cli.gui.GuiMain.<clinit>(GuiMain.java:63)