Run an invalid patch command like these for example:

patch apply /home/tom/bin/cli/customize-6.2/patches/jboss-eap-6.2.1.zip --preserve
patch apply /home/tom/bin/cli/customize-6.2/patches/jboss-eap-6.2.1.zip --override

results in

java.lang.NullPointerException
        at org.jboss.as.patching.cli.PatchHandler.createPatchOperationBuilder(PatchHandler.java:347)
        at org.jboss.as.patching.cli.PatchHandler.doHandle(PatchHandler.java:246)
        at org.jboss.as.cli.handlers.CommandHandlerWithHelp.handle(CommandHandlerWithHelp.java:86)
        at org.jboss.as.cli.impl.CommandContextImpl.handle(CommandContextImpl.java:600)
        at org.jboss.as.cli.impl.CommandContextImpl.handleSafe(CommandContextImpl.java:616)
        at org.jboss.as.cli.impl.CommandContextImpl.interact(CommandContextImpl.java:1204)
        at org.jboss.as.cli.impl.CliLauncher.main(CliLauncher.java:263)
        at org.jboss.as.cli.CommandLineMain.main(CommandLineMain.java:34)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.modules.Module.run(Module.java:292)
        at org.jboss.modules.Main.main(Main.java:455)

It would be better if invalid commands caused a message like

   Syntax Error - enter "patch --help" for more info

and not to simply crash the jvm