Hi Roy Xu,
it seems I have the same problem, too. I get an error message in German that means the same.
I try to use the H2 tools with .bat or windows cmd.exe.
I also tried to use java -cp ./* org.h2.tools.Shell but it ends in the same message.
I also tried to change the CLASSPATH in the system.
I didn't find any .class files of the tools, only the .java files.
Do I need to do anything else? I wasn't able to find any more information about that on the H2database webpage nor here in this group.