--- a/src/hotspot/share/services/heapDumper.cpp	Wed Oct 03 03:41:57 2018 -0400
+++ b/src/hotspot/share/services/heapDumper.cpp	Wed Oct 03 09:46:46 2018 -0400
@@ -696,7 +696,7 @@
 
 // returns hprof tag for the given type signature
 hprofTag DumperSupport::sig2tag(Symbol* sig) {
-  switch (sig->byte_at(0)) {
+  switch (sig->char_at(0)) {
     case JVM_SIGNATURE_CLASS    : return HPROF_NORMAL_OBJECT;
     case JVM_SIGNATURE_ARRAY    : return HPROF_NORMAL_OBJECT;
     case JVM_SIGNATURE_BYTE     : return HPROF_BYTE;
@@ -821,7 +821,7 @@
   for (FieldStream fld(ik, false, false); !fld.eos(); fld.next()) {
     if (!fld.access_flags().is_static()) {
       Symbol* sig = fld.signature();
-      switch (sig->byte_at(0)) {
+      switch (sig->char_at(0)) {
         case JVM_SIGNATURE_CLASS   :
         case JVM_SIGNATURE_ARRAY   : size += oopSize; break;
 
@@ -889,7 +889,7 @@
       writer->write_u1(sig2tag(sig));       // type
 
       // value
-      dump_field_value(writer, sig->byte_at(0), ik->java_mirror(), fld.offset());
+      dump_field_value(writer, sig->char_at(0), ik->java_mirror(), fld.offset());
     }
   }
 
@@ -925,7 +925,7 @@
   for (FieldStream fld(ik, false, false); !fld.eos(); fld.next()) {
     if (!fld.access_flags().is_static()) {
       Symbol* sig = fld.signature();
-      dump_field_value(writer, sig->byte_at(0), o, fld.offset());
+      dump_field_value(writer, sig->char_at(0), o, fld.offset());
     }
   }
 }