The previous tutorial articles provide details of customization of the default ant build script that is present in your WebObjects projects. This article provides a fully custom build script that you can just drop into your project and use it as an alternative to the default build.xml. This script is called the "split_embedded_build" script. Along with providing the script, this article explains in detail what deployment artifacts are produced by the build. Hopefully the functionality in this script will make their way into the standard script someday with configuration parameters settable in a simple way in the build.properties file.
This script only works with the modern WOLips project format and the WOnderApplication project template format (since the layout of regular. However the script is easily changed to accommodate the "old" standard format by changing the dir names in the script (for example "Sources" in the new project layout was "src" in the old layout)
Modern WebObjects Project Layout
This layout is the standard layout for all WebObjects projects created by WOLips (rev #4735 at least). The distinct folder names indicate if your project is in this modern format and if yours is the same, then this ant script should work.
Installation and Usage of the Script
Have no fear , you will not break anything by dropping this script as is into your project and trying it out. You can just use it as is without replacing your default build.xml
- So, download the script and drag it to the root of your project.
- Open the Ant run configuration for the script by right-clicking on the script and selecting the menu shown below.
- Next select the "clean" and compileAndBuild" tasks. If necessary use the "Order..." button to ensure that "clean" comes before "compileAndBuild".
Configure the Ant Tasks to be run
- Click the Run button to run the ant script and your fully embedded split install deployment bundles will be created in the "dist" folder.
Customizing Application/Bundle Name
It is common to want to use custom bundle build names. There are a number of advantages to having a unique application name for each build:
- For example, you might want to have a name that reflects the current revision so that a clean bundle is deployed without overwriting older version bundles on the servers.
- If the current and new versions of the app are compatible with the current database schema, smooth zero-downtime "rolling upgrades" are possible by using this strategy... and the ability to switch back to the older version if an unexpected deployment problem occurs
OK, so getting to the point, an optional custom app name can be set in the project's build.properties file by simply adding a property "build.app.name" as shown below.
Customizing the Application Build Name
The desirable features of this script are
- Fully embedded - your deployed bundle reflects the frameworks you developed and tested with instead of risky assumption that the server has the exact same WebObjects and 3rd party frameworks configuration and versions that you had on your development machine.
- Custom application/bundle names - new version has new URLs for webserver resources that are often cached by browser so the new version will be requested since the URL is different.
- Self-contained deployment bundles - all required frameworks are embedded - minimal dependency on target server configuration and versions. For example, there is no need to install Wonder frameworks on your deployment server since the ones you developed and tested with are embedded in the deployment bundles. Experience has shown that this improves consistency of deployment reliability.
- Compressed gzipped tar archives of both application and webserver bundles are created, ready for copying to target server(s)
- This is easily decompressed on the server using
- $ sudo tar -xvzf bundle.tar.gz
Anatomy of Embedded Split Install Bundles produced by this Ant Script
The Deployment Files
The two compressed "ready-to-deploy" bundles are highlighted below
The notable aspects of the embedded build structure are shown below.
Embedded Application Bundle Layout
- Opening the app executable (command line script at bundle root having the application name as its name) and looking at the end will reveal that the WOFrameworksBaseURL references the frameworks inside the webserver embedded bundle.
- Examining the Contents/MacOS/MacOSClassPath.txt file will reveal that the java classpath refers to all the jars inside the embedded bundle.
The application bundle typically gets installed as follows:
- Install Location = /Library/WebObjects/Applications/
- chown (ownership) = appserver:appserveradm
- chmod (permissions) = 755 (750 if you wish, but your server login id needs to be a member of appserveradm group to cd into the bundle)
Embedded WebServer Bundle Layout
The webserver bundle typically gets installed as follows:
- Install Location = /Library/WebServer/Documents/WebObjects/
- chown (ownership) = root:wheel
- chmod (permissions) = 755
This script was developed and tested on Mac OS X 10.4.10, Eclipse 3.3.1 and WOLips #4735. It should be compatible with later versions of WOLips and Eclipse. It works with regular WebObjects apps and Wonder based apps. I don't have a Windows Eclipse/WOLips installation, so if you are a Windows user, please feel free to make necessary changes and submit revised build script if this does not run on Windows.