Running jdeps --print-module-deps but module is not found, it will fail and print the exception with stack trace. It's a user error. It should specify the correct module path for resolving the module graph. A slight improvement to make it clearer is not to print the exception stack trace.

Exception in thread "main" java.lang.module.FindException: Module lib not found, required by main
        at java.base/java.lang.module.Resolver.findFail(Resolver.java:892)
        at java.base/java.lang.module.Resolver.resolve(Resolver.java:192)
        at java.base/java.lang.module.Resolver.resolve(Resolver.java:141)
        at java.base/java.lang.module.Configuration.resolve(Configuration.java:420)
        at java.base/java.lang.module.Configuration.resolve(Configuration.java:254)
        at jdk.jdeps/com.sun.tools.jdeps.JdepsConfiguration$Builder.build(JdepsConfiguration.java:564)
        at jdk.jdeps/com.sun.tools.jdeps.JdepsTask.buildConfig(JdepsTask.java:607)
        at jdk.jdeps/com.sun.tools.jdeps.JdepsTask.run(JdepsTask.java:561)
        at jdk.jdeps/com.sun.tools.jdeps.JdepsTask.run(JdepsTask.java:537)
        at jdk.jdeps/com.sun.tools.jdeps.Main.main(Main.java:50)