I'm a relative newcomer to Ant - only been writing build.xml files for about
8 months. To avoid huge lists of unresolved symbols at compile time, I
provide checking for the presence of required jar files prior to kicking off
the compile step. I've put a shortened version of the relevant section from
my build.xml at the end of this message. The issue I have is that in order
to do this, I've had to list my jar files 3 different times: for the echo,
for the condition, and finally for the classpath. My actual set of jars is
much longer, so this becomes a maintenance headache. Is there any way I can
accomplish the same thing without repeating the set of files? I can of
course use a fileset for the classpath, but from what I read in the Ant
manual, there is no way to use a fileset for either the echo task or the
condition task. I appreciate all pointers.
<target name="checkinputjars">
<echo>Checking for required input jars</echo>
<echo>"${deploy_dir}/lib/xml.jar"</echo>
<echo>"${deploy_dir}/lib/jce1_2_1.jar"</echo>
<echo>"${deploy_dir}/lib/sunjce_provider.jar"</echo>
<condition property="inputjarsavailable">
<and>
<available file="${deploy_dir}/lib/xml.jar"/>
<available file="${deploy_dir}/lib/jce1_2_1.jar"/>
<available file="${deploy_dir}/lib/sunjce_provider.jar"/>
</and>
</condition>
</target>
<target name="inform_no_input_jars" depends="checkinputjars"
unless="inputjarsavailable">
<fail message="ERROR! Could not find the required input JAR files"/>
</target>
<target name="build" depends="inform_no_props, inform_no_input_jars,
init">
<javac debug="on" destdir="${build}">
<classpath>
<pathelement location="${deploy_dir}/lib/xml.jar"/>
<pathelement location="${deploy_dir}/lib/jce1_2_1.jar"/>
<pathelement location="${deploy_dir}/lib/sunjce_provider.jar"/>
</classpath>
</javac>
</target>
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