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I recently set up Mathematica 9.0.1 on a new computer, along with x64 Eclipse Indigo with JRE 1.7, and the Wolfram Workbench 2 plug-in. Something is amiss, because when I try to do any sort of task involving Mathematica from inside Workbench, I get the same error message:

An internal error occurred during: "FrontEnd Job::Open Notebook".
 com.wolfram.jlink.NativeLink.MLOpenString(Ljava/lang/String;[Ljava/lang/String;)J

Otherwise, Mathematica works fine, as does the Eclipse install when used for other purposes (Java and Scala development).

This is a 64 bit Windows 7 machine.

Pillsy
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In the comments to this answer Rolf Mertig mentions that you have to use the 32 bit version of Eclipse.

(So I guess we can close this as a duplicate?)

I just installed WB into 32bit eclipse 3.7.2 on Win7 64bit and everything works great!

Screen shot

Community
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Ajasja
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  • I have found a way to avoid a 32-bit re-installation of Eclipse, based on help from Wolfram support. Would it be inappropriate to add it either here, or to the other question? – Pillsy Apr 30 '13 at 18:51
  • @Pillsy Hmm good question. I would definitely add this somewhere! You can't add it here (right now) as we would first have to reopen the question. I guess you can add it as an answer to the other question. Then it can be moved by the admins if necessary. – Ajasja Apr 30 '13 at 19:18
  • related http://software.additive-net.de/en/support/wolfram-support/wolfram-faq-installation/3747-workbench64 (you'll need to translate from german) – faysou Dec 20 '14 at 22:12