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Figure 7.1 The two deployment paths being addressed. A complex project may well use both paths, with common source acting as the foundation.
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our installation guide; the online Ant documentation contains live links to the most up-to-date locations.
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Table 7.1 Libraries you need for deployment. If you get an error using these tasks, make sure these files are found. Library optional.jar netcomponents.jar activation.jar mail.jar Comment May have a name such as jakarta-ant-1.4.1-optional.jar Needed for <ftp> and <telnet> Needed for <mail> Needed for <mail>
The other tool for deployment is, of course, Tomcat, which you should have installed and running before trying to deploy to it from Ant. For remote deployment, the remote server should support FTP and perhaps Telnet. This is pretty much standard for Unix systems; for Windows systems it is not. Microsoft supplies an FTP server as part of IIS1: you can install it from the Add/Remove Windows Components section of the control panel. An email server is also useful. We are assuming that the local system is running an SMTP server of some kind, but use a property to define the mail server for easy overriding.
TASKS FOR DEPLOYMENT
We have covered the basic deployment tasks already: <copy>, <delete>, <java>. These are the foundation for local server deployment. For remote deployment, we need to introduce a few more tasks.
Just be sure to stay on top of Microsoft security bulletins and be aware of all the services your Windows system is running. In a former life, Erik was an NT security expert having co-authored award-winning NT security analysis software. Long live NtSpectre!
TASKS FOR DEPLOYMENT
File transfer with <ftp> If you have a development server s file system mounted on your own machine, such as with NFS or LAN Manager, then you can deploy files to a remote server using <copy>. If you cannot do this, then you need to resort to <ftp>. The <ftp> task is very powerful; it lets you perform the following tasks in a build file: Connect to a remote server using a specified username and password. Control the port of the server and whether passive mode is used for better firewall pass-through. Upload files to a remote server using timestamp-based dependency checking. Download files from a remote server using timestamp-based dependency checking. Delete remote files. Save a listing of a directory to a file. Create remote directories. For deployment, we are only concerned with connecting to a server and uploading changed files. The remaining functionality may be of use in more complex deployment situations, and for automating other parts of the build process, such as fetching updated libraries and data files from a central server. One important point to note is that for Ant to work with Windows FTP server, you should configure the server to provide Unix, not MS-DOS, directory listings. If this is not done, then some commands won t work.
Probing for server availability The <condition> task can contain a few tests that probe to see whether remote systems are available. The <http> test can probe for a remote page on a local or remote web server. The test only succeeds if the server responds to the request with an HTTP status code below 400. Missing pages, error code 401, and access-denied pages, error code 403, both fail the test. With the condition we can test for local or remote web servers:
<http <http <http <http url="http://127.0.0.1/"/> url="http://127.0.0.1:8080/"/> url="http://eiger:8080/antbook/happy.jsp"/> url="http://jakarta.apache.org/ant/"/>
You can use the command to fetch a JSP page, forcing its compilation. Web application containers generate an error code of 500 when the page won t compile, breaking the build. A sibling test, <socket>, probes for a local or remote TCP socket being reachable. This can be used to test for any well-known port being available, including telnet (23), SMTP (25), and HTTP (80, sometimes 8080 and 8088):
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