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From Jack Woehr <>
Subject 1.6.1 -- where is "optional.jar"
Date Mon, 29 Mar 2004 22:34:29 GMT
I built 1.6.1 from source and get the following error when running my build ... so I wonder,
"where is optional.jar" since it doesn't seem to get built in the 1.6.1. build ... PS all
dependencies for the Script task such as the latest bsf.jar and js.jar are there. TIA.

     /usr/local/work/jax/jazmin/build/build.xml:328: Following error occured while ex
     ecuting this line
     /usr/local/work/jax/jazmin/build/build_compile.xml:42: Could not create task or
     type of type: script.

     Ant could not find the task or a class this task relies upon.

     This is common and has a number of causes; the usual
     solutions are to read the manual pages then download and
     install needed JAR files, or fix the build file:
      - You have misspelt 'script'.
        Fix: check your spelling.
      - The task needs an external JAR file to execute
        and this is not found at the right place in the classpath.
        Fix: check the documentation for dependencies.
        Fix: declare the task.
      - The task is an Ant optional task and optional.jar is absent
        Fix: look for optional.jar in ANT_HOME/lib, download if needed
      - The task was not built into optional.jar as dependent
        libraries were not found at build time.
        Fix: look in the JAR to verify, then rebuild with the needed
        libraries, or download a release version from
      - The build file was written for a later version of Ant

      - The task is not an Ant core or optional task
        and needs to be declared using <taskdef>.

     Remember that for JAR files to be visible to Ant tasks implemented
     in ANT_HOME/lib, the files must be in the same directory or on the

Jack J. Woehr            # "[F]ar in the empty sky a solitary esophagus slept #  upon motionless wing; everywhere brooded stillness, #  serenity, and the peace of God." - Mark Twain

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