workaround for http://jira.codehaus.org/browse/JRUBY-5711

Author: denofevil

lib/ruby-debug/xml_printer.rb

@@ -163,7 +163,7 @@ def print_variable(name, value, kind)
           value_str = $1
         end
       end
-      value_str = "[Binary Data]" if value_str.is_binary_data?
+      value_str = "[Binary Data]" if (value_str.respond_to?('is_binary_data?') && value_str.is_binary_data?)
       print("<variable name=\"%s\" kind=\"%s\" value=\"%s\" type=\"%s\" hasChildren=\"%s\" objectId=\"%#+x\"/>",
           CGI.escapeHTML(name), kind, CGI.escapeHTML(value_str), value.class,
           has_children, value.respond_to?(:object_id) ? value.object_id : value.id)