Check Properties
This example illustrates how to check properties using environment
variable whether it is set or not. In this code, there are three properties;
the first two are used to define source directory and destination directory.
The source directory is 'src' and the destination directory is 'build'.
The element <property environment="env"> is a path of
jar file dependent on environment variables, and these are available only if
you use <property environment="env"> before you import
the property file. The following example shows how to check whether TOMCAT_HOME
environment variable is set or not. If TOMCAT_HOME environment variable is
set, then the output will display build successful... as given below.
build.xml
|
<project name="Check Properties" default="compile" basedir=".">
<property name="dir.src" value="src"/>
<property name="dir.build" value="build"/>
<property environment="env"/>
<target name="check">
<fail unless="env.TOMCAT_HOME">TOMCAT_HOME class path must be set</fail>
</target>
<target name="clean" depends="check">
<delete dir="${dir.build}"/>
</target>
<target name="prepare" depends="clean">
<mkdir dir="${dir.build}"/>
</target>
<target name="compile" depends="prepare" >
<echo>Compile code...</echo>
</target>
</project>
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Output:
But if TOMCAT_HOME environment variable is not set, then the following
error message will be displayed.
Download Source Code
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