When compiling some jasm files, through the "@compile" jtreg test action, the following warning message gets printed:

mexit02a.jasm (24:19) Warning: Class file version not specified in file or by -cv parameter. Defaulting to version "45:3"

jtreg upgraded to 8.1 version of asmtools recently and this appears to be a new behaviour in this version of asmtools (as compared to 7.0-b09).

jtreg, when launching jasm tool for compiling the jasm file, should pass along the "-cv" option to specify the default class file version to use in the absence of an explicit one in the jasm file being compiled. Doing so will prevent these warnings.