Applying this patch https://gerrit.fd.io/r/#/c/4605/ produces following error when building:

In file included from /home/vagrant/vpp/build-data/../src/vpp-api/java/jvpp-core/jvpp_core.c:59:0:
jvpp-core/jvpp_core_gen.h: In function 'Java_io_fd_vpp_jvpp_core_JVppCoreImpl_lispGpeAddDelFwdEntry0':
jvpp-core/jvpp_core_gen.h:3428:39: error: expected '=', ',', ';', 'asm' or '_attribute_' before '.' token
jfieldID loc_pairs[_i].localIsIp4FieldId = (*env)->GetFieldID(env, loc_pairsLocalClass, "isIp4", "B");
^
jvpp-core/jvpp_core_gen.h:3428:39: error: expected expression before '.' token
jvpp-core/jvpp_core_gen.h:3429:36: error: expected '=', ',', ';', 'asm' or '_attribute_' before '.' token
jbyte loc_pairs[_i].localIsIp4 = (*env)->GetByteField(env, loc_pairsLocal, loc_pairs[_i].localIsIp4FieldId);
...