JJava 1.0-a6:

%maven org.dflib:dflib-jupyter:2.0.0-M5

var cps = Arrays.asList(System.getProperty("java.class.path").split(":"));
cps.stream().filter(c -> c.contains("dflib")).count()

prints 927 on first run, 1854 on second, etc. dflib-2.0.0-M5.jar is encountered 103 times in the classpath. It doesn't seem to have any other side effects, but something is off (maybe just how we set java.class.path value, not paying attention to duplicates)