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I recently installed the latest Wolfram Workbench plugin in my eclipse IDE (Neon.1a Release 4.6.1). Then I attempted to follow this old tutorial on generating docs with the documentation tool pallete: http://www.wolfram.com/broadcast/video.php?c=93&v=899

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When pressing build I reiceved this message:

BUILD FAILED

/Users/admin/Documents/eclipse_workspace/test/docbuild.xml:132: The following error occurred while executing this line: /Users/admin/Documents/eclipse_workspace/test/docbuild.xml:90: taskdef A class needed by class com.wolfram.jlink.util.MathematicaTask cannot be found: org/apache/tools/ant/Task using the classloader AntClassLoader[/Applications/Mathematica.app/Contents/SystemFiles/Links/JLink/JLink.jar]

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    $\begingroup$ Eclipse comes in multiple versions. Install the plugin into the Java development version, not any other. Let us know if it works now. Also make sure that you have a JDK (not JRE) installed. $\endgroup$
    – Szabolcs
    Dec 14, 2016 at 9:04
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    $\begingroup$ Thanks @Szabolcs I was using c++ not java, now it works. $\endgroup$
    – M.R.
    Dec 14, 2016 at 9:11
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    $\begingroup$ I reported this more than a month ago, and suggested correcting this article: support.wolfram.com/kb/27221 The article says: "Note that the Wolfram Workbench plugin is compatible with the various standard Eclipse IDEs." After your experience I am convinced that this is not correct. $\endgroup$
    – Szabolcs
    Dec 14, 2016 at 9:13
  • $\begingroup$ Btw, do you know of any great DocumentationTools tutorials :) $\endgroup$
    – M.R.
    Dec 14, 2016 at 9:16
  • $\begingroup$ The best I know is the official docs: reference.wolfram.com/workbench/index.jsp and the videos you already know about. $\endgroup$
    – Szabolcs
    Dec 14, 2016 at 9:18

1 Answer 1

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If you see this error:

A class needed by class com.wolfram.jlink.util.MathematicaTask cannot be found: org/apache/tools/ant/Task

then try installing the Workbench plugin into "Eclipse for Java Developers".

It seems other versions, e.g. "Eclipse for C++ Developers", lack some components that the Workbench plugin needs.

Also make sure to have the JDK (not JRE) installed.

The Workbench support article at http://support.wolfram.com/kb/27221 says,

Note that the Wolfram Workbench plugin is compatible with the various standard Eclipse IDEs.

I am not sure this is correct.

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  • $\begingroup$ I do use Eclipse for C/C++ developers, so I doubt it is strictly necessary to download the one for Java. But it needed some extra configuration, and I have to check whether that involved adding the JDT component. I agree the support article should be corrected if it does not work "out of the box". $\endgroup$
    – ilian
    Dec 14, 2016 at 15:24

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