JZIPUpdate

• What does it do?
• Features
• Documentation
  • Requirements
  • How to Use
  • How it Works
  • Java Docs
• Screenshots
• Download
• Licensing and Usage
• Development
  • Upcoming Features
  • Planned Features
  • Known Bugs
  • Change Log

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JZIPUpdate

Update ZIP and JAR files incrementally over HTTP transferring only the data that has changed in compressed form. Does not require any pre- or on-the-fly compression or any application/code running server-side except a HTTP 1.1-compliant web server and an index file created at time of deployment.

JZIPUpdate 0.9 is now available and fixes a serious parsing bug. Please update to release 0.9, especially if you get an exception labelled Found CR in line but not followed by LF.
The latest files for Java 1.4 and 1.5 are always available from the SourceForge project page.

Thanks for using JZIPUpdate and sorry for the inconvenience :)

Features

• Updates ZIP and JAR files over plain HTTP 1.1, support for proxies provided by Java runtime
• Minimal data transfer:
  • Incremental updating only tranfers the resources that have actually changed, not the whole ZIP/JAR file
  • All data is transferred in compressed form, without the need for pre- or on-the-fly compression
• Low demands on server: Only two HTTP requests when updates are required, only one for when the client-side file is up-to-date.
• No application code required to run on the server, just a web server software which support for HTTP 1.1 (basically every web server software released in the last 10 years)
• Transparently updates sealed and even signed JARs without invalidating signatures or breaking the chain of trust
• No need for clumsy external versioning information, just one small compressed index file per ZIP/JAR archive

Download JZIPUpdate

You can download the latest JZIPUpdate release from the SourceForge project page.

Please remember to also download RetroWeaver if you want to use the 1.4-compatible JZIPUpdate binaries. You only need to have retroweaver-rt.jar on your classpath along with the "retroweaved" JZIPUpdate JAR.

Licensing and Usage

Copyright © 2005 Philipp Reichart <philipp dot reichart at vxart dot de>

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

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.