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Jasmin is an assembler for the Java Virtual Machine. It takes ASCII descriptions of Java classes, written in a simple assembler-like syntax using the Java Virtual Machine instruction set. It converts them into binary Java class files, suitable for loading by a Java runtime system. We provide you with a Jasmin editor which was built with Spoofax.


To update the Spoofax plugin in Eclipse, perform the following steps:

  1. go to Help -> Install New Software…
  2. in the Work with field, enter
  3. press enter and wait for the update site to load
  4. press Select All
  5. press Next and wait for Eclipse to calculate what to install and update
  6. press Finish to download and install updates
  7. when a security warning pops up, press OK to dismiss the warning
  8. when Eclipse has installed all updates, it will ask for a restart, press Yes to restart Eclipse

If installation fails with errors indicating that “updates are not permitted”, it means that your Eclipse installation is in a location that requires admin rights to write files. This is the case on Windows if you’ve copied Eclipse to Program Files. Move it to a directory where you have write access, such as the desktop, to solve the problem.