Probable spore cortex-lytic enzyme involved in the depolymerization of cortex peptidoglycan during germination. Activated, directly or indirectly, by endogenous spore dipicolinic acid released in response to nutrients. Is also activated by exogenous Ca(2+)-dipicolinic acid. Expressed during sporulation; in mother cell compartment, then located in the spore coat. Expression is sigma E-dependent. Belongs to the CwlJ family.