Question

I wanted to check if a property value has a value which is supposed to be read from another file in ant

can any body please without an additional jar.

<property name="a" value="${input.password}" />

wanted to check if input.password has got the value or not from xyz.properties file or not

many thanks
Jib

P.S: Actually I have to check this line password=mypassword is exist in .properties file or not with ant script. Another way is welcome !

Edit: I am doing from one of the referenced solutions but not succeeding:

<property file="..\..\xyz\application.properties" prefix="input" /> 

<property name="foo" value="${input.password}"/>
 <fail message="Property &quot;foo&quot; has no value">
     <condition>
          <not>
             <equals arg1="${foo}" arg2=""/>
          </not>
     </condition>
</fail>

Always getting this message:”Property "foo" has no value” regardless of this line exists or not:password=de in application properties.

Answer 1

you can try using the <fail message="db.schema is not defined!" unless="db.schema"/> block this for example will fail if db.schema is not defined. You might find some of this and useful, is this what you’re looking for?

Check this too. Oh OK I see what you mean now, please try this (I’m using Ant 1.8.2):
this is build.xml :

<project name="Bla" default="build" basedir=".">
<target name="build">
    <property file="bla.properties"/>

<fail>
     <condition>
       <not>
        <equals arg1="${foo}" arg2="bodo"/>
       </not>
     </condition>
</fail>
</target>
</project>

The file bla.properties contains foo=boo, and it currently fails, if I change bodo to boo, is succeeds.