Add test case for #517, not problem since we allow non-serializable serializers
Add test case for #517, not problem since we allow non-serializable serializers

pettermahlen/mapdb,hangum/mapdb,lamfire/mapdb,jankotek/mapdb,sumit784/mapdb,ringoluo/mapdb,ffjiao/mapdb,codeaudit/mapdb,morfeo8marc/mapdb,SleimanJneidi/mapdb,jankotek/MapDB,cocosli/mapdb,binarytemple/mapdb,jankotek/MapDB,jankotek/mapdb