You can use filters to replace tokens in a configuration file with their proper values for the deployment environment (see Listing 20.6). Filters are another way to support multiple deployment environments. Let's look at a case where you have both a production database and a development database. When deploying, you want the production value (jdbc_url in Listing 20.6) to refer to the correct database.
<project name="hello" default="run">Listing 20.6
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