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I have downloaded the Workbench 2.0.0 zip file and followed the install new software -> add -> archive steps to install the workbench plugin. After that, the Workbench core and webMathematica tools are listed as already installed. I installed the plugin into a 3.8 vintage eclipse.

When I try to "Run" a notebook in a Mathematica projects (basic or application) I get the following error message:

FrontEnd Job:: Open Notebook has enountered a problem. An internal error occurred during::FrontEnd Job::Open Notebook.

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

I believe I have the right path to the Mathematica executable (when I change the path to point to a non existing file, I get a message that says to adjust the path).

Most postings on this site suggest that 32-bit is the only workable solution while at least one post indicated that there is a workaround for 64-bit machines.

I'd rather use 64-bit kepler (4.2 vintage eclipse). Is that possible?

I couldn't find the details from the one posting that indicated 64-bit is possible. Can someone provide the details?

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What version of Mathematica are you trying to run? I've had some troubles with 6.0.1 and Workbench, because 6.0.1 doesn't fully support 64-bit JVM's afaik. That was on a Mac though, so I'm not sure how relevant it is for your case. – Teake Nutma Jun 12 '13 at 17:21
@teakeNutma I am using Mathematica – gary Jun 12 '13 at 22:15
I have this problem sometimes, for example today, windows 8.1 x64@Mathematica 10.0 workbench2 – HyperGroups Jan 20 '15 at 11:30
I have the same problem too. Can someone help? – iav May 8 '15 at 4:06
@Kuba, I've already written them but they did not provide an answer. Instead WRI support provided access to the new Workbench 3.0 which gives the same exact error.. – iav May 8 '15 at 6:04

I was able to solve the problem in the following way.

  1. Uninstall Mathematica 10 and Workbench.
  2. Install Mathematica 9
  3. Install Workbench
  4. Test whether everything works (it worked for me at this stage)
  5. Install Mathematica 10
  6. Change the paths in Preferences\Mathematica to Mathematica 10

This should be it.

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