java - Ant fails in try catch block -

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in ant build have following code:

<trycatch reference="exception_ref">     <try>         <echo>start building delivery</echo>     </try>     <catch>         <property name="exception" refid="exception_ref" />         <property name="message" value="error in trycatch block:${line.separator}${exception}" />         <echo message="${message}" />         <fail message="${message}" />     </catch>     <finally>         <echo>finally</echo>     </finally> </trycatch>

ant says:

problem: failed create task or type trycatch cause: name undefined. action: check spelling. action: check custom tasks/types have been declared. action: check / declarations have taken place.

what missing here?

// edit: using ant in eclipse

trycatch task provided ant-contrib third-party library. make sure download jar , have referenced on ant classpath. see this link how this.

on eclipse, go window -> preferences -> ant -> runtime. under classpath tab, add ant-contrib jar using "add external jars..." button. , mentioned in link, need declare tasks follows:

<taskdef resource="net/sf/antcontrib/antlib.xml"/>

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