Please note that the mentioned test pass with both current jdk9 and jigsaw/m2, this issue is kind of cleanup work.

The jigsaw/m2 forest is currently accumulating the changes for the move to a modular image. The modular image will replace the current JRE/JDK layout. The replacement for j2sdk-image will not not have a top-level "jre" directory. The replacement for both j2sdk-image and j2re-image will not contain rt.jar, tools.jar and other JAR files, instead the classes and resources will be stored in a new container format.

Test sun/tools/jconsole/ResourceCheckTest.sh could remove jconsole.jar from classpath.
Moreover, if "make sure jconsole.jar in classpath for both java and javac" is the purpose of sun/tools/jconsole/ResourceCheckTest.sh for sun/tools/jconsole/ResourceCheckTest.java, then this script is not needed anymore.