HONEYCOMB-67 Introduce exception handling into JVPP

Send calls throws VppInvocationException on failure
Failed requests (negative retval) reported over onError callback interface method
Removed retval attributes from dto/xxxReply.java calls

Change-Id: Ibd4e90c320d080e02d75b4bd056a7b11c8e37aa7
Signed-off-by: Tibor Sirovatka <tsirovat@cisco.com>
diff --git a/vpp-api/java/japi/vppjni.c b/vpp-api/java/japi/vppjni.c
index 5645263..f1b8eda 100644
--- a/vpp-api/java/japi/vppjni.c
+++ b/vpp-api/java/japi/vppjni.c
@@ -41,7 +41,9 @@
 #include <api/vpe_all_api_h.h>
 #undef vl_printfun
 
+#ifndef VPPJNI_DEBUG
 #define VPPJNI_DEBUG 0
+#endif
 
 #if VPPJNI_DEBUG == 1
   #define DEBUG_LOG(...) clib_warning(__VA_ARGS__)
@@ -1683,7 +1685,9 @@
     jm->result_ready = 1;
 }
 
+#ifndef VPPJNI_DEBUG_COUNTERS
 #define VPPJNI_DEBUG_COUNTERS 0
+#endif
 
 static void vl_api_vnet_interface_counters_t_handler
 (vl_api_vnet_interface_counters_t *mp)