Hi David,
to call a static method from ACL you have to use the java_static() ACL function. In your case the call would be:
ret = java_static("HelloObjIs","main",args);
Now for the args you need to convert an ACL array to a Java array. Basically you would do the following in ACL:
local myarr[];
# ... put in values as needed or leave empty...
myarr[1] = "something";
# now convert to Java array
local obj = java_array_from_acl(myarr,"[Ljava/lang/String;");
# now call your static method with parameters
ret = java_static("HelloObjIs","main",obj);
Hope that helps.
Kind regards
Sirko