--- a/src/hotspot/share/jfr/jni/jfrJavaCall.cpp	Fri Aug 23 18:47:55 2019 +0200
+++ b/src/hotspot/share/jfr/jni/jfrJavaCall.cpp	Sat Aug 24 14:30:27 2019 +0200
@@ -184,7 +184,7 @@
   }
 }
 
-JfrJavaArguments::JfrJavaArguments(JavaValue* result) : _result(result), _klass(NULL), _name(NULL), _signature(NULL), _array_length(0) {
+JfrJavaArguments::JfrJavaArguments(JavaValue* result) : _result(result), _klass(NULL), _name(NULL), _signature(NULL), _array_length(-1) {
   assert(result != NULL, "invariant");
 }
 
@@ -193,7 +193,7 @@
   _klass(NULL),
   _name(NULL),
   _signature(NULL),
-  _array_length(0) {
+  _array_length(-1) {
   assert(result != NULL, "invariant");
   if (klass_name != NULL) {
     set_klass(klass_name, CHECK);
@@ -210,7 +210,7 @@
   _klass(NULL),
   _name(NULL),
   _signature(NULL),
-  _array_length(0) {
+  _array_length(-1) {
   assert(result != NULL, "invariant");
   if (klass != NULL) {
     set_klass(klass);