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diff --git a/src/vpp-api/java/jvpp/gen/jvppgen/util.py b/src/vpp-api/java/jvpp/gen/jvppgen/util.py
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+++ b/src/vpp-api/java/jvpp/gen/jvppgen/util.py
@@ -0,0 +1,220 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2016 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os, pprint
+from os import removedirs
+
+
+def underscore_to_camelcase(name):
+ name = name.title().replace("_", "")
+ return name[0].lower() + name[1:]
+
+
+def underscore_to_camelcase_upper(name):
+ name = name.title().replace("_", "")
+ return name[0].upper() + name[1:]
+
+
+def remove_folder(folder):
+ """ Remove folder with all its files """
+ for root, dirs, files in os.walk(folder, topdown=False):
+ for name in files:
+ os.remove(os.path.join(root, name))
+ removedirs(folder)
+
+
+reply_suffixes = ("reply", "details", "l2fibtableentry")
+
+
+def is_reply(name):
+ return name.lower().endswith(reply_suffixes)
+
+
+def is_details(name):
+ return name.lower().endswith(reply_suffixes[1]) or name.lower().endswith(reply_suffixes[2])
+
+
+def is_retval_field(name):
+ return name == 'retval'
+
+dump_suffix = "dump"
+
+
+def is_dump(name):
+ return name.lower().endswith(dump_suffix)
+
+
+def get_reply_suffix(name):
+ for reply_suffix in reply_suffixes:
+ if name.lower().endswith(reply_suffix):
+ if reply_suffix == reply_suffixes[2]:
+ # FIXME workaround for l2_fib_table_entry
+ return 'entry'
+ else:
+ return reply_suffix
+
+# Mapping according to:
+# http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/types.html
+#
+# Unsigned types are converted to signed java types that have the same size.
+# It is the API user responsibility to interpret them correctly.
+jni_2_java_type_mapping = {'u8': 'byte',
+ 'u8[]': 'byte[]',
+ 'i8': 'byte',
+ 'i8[]': 'byte[]',
+ 'u16': 'short',
+ 'u16[]': 'short[]',
+ 'i16': 'short',
+ 'i16[]': 'short[]',
+ 'u32': 'int',
+ 'u32[]': 'int[]',
+ 'i32': 'int',
+ 'i32[]': 'int[]',
+ 'u64': 'long',
+ 'u64[]': 'long[]',
+ 'i64': 'long',
+ 'i64[]': 'long[]',
+ 'f64': 'double',
+ 'f64[]': 'double[]'
+ }
+
+vpp_2_jni_type_mapping = {'u8': 'jbyte',
+ 'u8[]': 'jbyteArray',
+ 'i8': 'jbyte',
+ 'u8[]': 'jbyteArray',
+ 'u16': 'jshort',
+ 'u16[]': 'jshortArray',
+ 'i16': 'jshort',
+ 'i16[]': 'jshortArray',
+ 'u32': 'jint',
+ 'u32[]': 'jintArray',
+ 'i32': 'jint',
+ 'i32[]': 'jintArray',
+ 'u64': 'jlong',
+ 'u64[]': 'jlongArray',
+ 'i64': 'jlong',
+ 'i64[]': 'jlongArray',
+ 'f64': 'jdouble',
+ 'f64[]': 'jdoubleArray'
+ }
+
+# https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/types.html#type_signatures
+jni_2_signature_mapping = {'u8': 'B',
+ 'u8[]': '[B',
+ 'i8': 'B',
+ 'i8[]': '[B',
+ 'u16': 'S',
+ 'u16[]': '[S',
+ 'i16': 'S',
+ 'i16[]': '[S',
+ 'u32': 'I',
+ 'u32[]': '[I',
+ 'i32': 'I',
+ 'i32[]': '[I',
+ 'u64': 'J',
+ 'u64[]': '[J',
+ 'i64': 'J',
+ 'i64[]': '[J',
+ 'f64': 'D',
+ 'f64[]': '[D'
+ }
+
+# https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/functions.html#Get_type_Field_routines
+jni_field_accessors = {'u8': 'ByteField',
+ 'u8[]': 'ObjectField',
+ 'i8': 'ByteField',
+ 'i8[]': 'ObjectField',
+ 'u16': 'ShortField',
+ 'u16[]': 'ObjectField',
+ 'i16': 'ShortField',
+ 'i16[]': 'ObjectField',
+ 'u32': 'IntField',
+ 'u32[]': 'ObjectField',
+ 'i32': 'IntField',
+ 'i32[]': 'ObjectField',
+ 'u64': 'LongField',
+ 'u64[]': 'ObjectField',
+ 'i64': 'LongField',
+ 'i64[]': 'ObjectField',
+ 'f64': 'DoubleField',
+ 'f64[]': 'ObjectField'
+ }
+
+
+# vpe.api calls that do not follow naming conventions and have to be handled exceptionally when finding reply -> request mapping
+# FIXME in vpe.api
+unconventional_naming_rep_req = {
+ 'cli_reply': 'cli_request',
+ 'vnet_summary_stats_reply': 'vnet_get_summary_stats',
+ # This below is actually a sub-details callback. We cannot derive the mapping of dump request
+ # belonging to this sub-details from naming conventions. We need special mapping
+ 'bridge_domain_sw_if_details': 'bridge_domain',
+ # This is standard dump call + details reply. However it's not called details but entry
+ 'l2_fib_table_entry': 'l2_fib_table'
+ }
+
+#
+# FIXME no convention in the naming of events (notifications) in vpe.api
+notifications_message_suffixes = ("event", "counters")
+notification_messages_reused = ["sw_interface_set_flags"]
+
+# messages that must be ignored. These messages are INSUFFICIENTLY marked as disabled in vpe.api
+# FIXME
+ignored_messages = ["is_address_reachable"]
+
+
+def is_notification(name):
+ """ Returns true if the structure is a notification regardless of its no other use """
+ return is_just_notification(name) or name.lower() in notification_messages_reused
+
+
+def is_just_notification(name):
+ """ Returns true if the structure is just a notification and has no other use """
+ return name.lower().endswith(notifications_message_suffixes)
+
+
+def is_ignored(param):
+ return param.lower() in ignored_messages
+
+
+def remove_reply_suffix(camel_case_name_with_suffix):
+ return remove_suffix(camel_case_name_with_suffix, get_reply_suffix(camel_case_name_with_suffix))
+
+
+def remove_suffix(camel_case_name_with_suffix, suffix):
+ suffix_length = len(suffix)
+ return camel_case_name_with_suffix[:-suffix_length] if suffix_length != 0 else camel_case_name_with_suffix
+
+
+def is_control_ping(camel_case_name_with_suffix):
+ return camel_case_name_with_suffix.lower().startswith("controlping");
+
+
+def api_message_to_javadoc(api_message):
+ """ Converts vpe.api message description to javadoc """
+ str = pprint.pformat(api_message, indent=4, width=120, depth=None)
+ return " * " + str.replace("\n", "\n * ")
+
+
+notification_dto_suffix = "Notification"
+
+
+def add_notification_suffix(camel_case_dto_name):
+ camel_case_dto_name += notification_dto_suffix
+ return camel_case_dto_name
+
+
+def is_array(java_type_as_string):
+ return java_type_as_string.endswith("[]")