How to solve “HTTP ERROR 500 Problem accessing /. Reason: Error running javac.exe compiler”

I am test Google App Engine in my Eclipse, but this error appears always if I add .jsp file. And when I run/debug the project, the error “Error running javac.exe compiler” shows up.

How to solve: use JDK instead of JRE in your Eclipse. Go to Eclipse Menu:  Window > Preferences > Java > Installed JREs > Add or check JDK (if you did not config JDK before, add it. Otherwise, check it.)

Details error message:

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Configure NetBeans IDE 6.9

  1. Add UML support
    First, go to “Tools -> PlugIns -> Settings”, click “add” to add as new  source for plug-in.
    Then, go to “Tools -> PlugIns -> Available Plugins” , click “Reload Catalog”, you will find “UML” is listed. Just install it!
    How to use this tool:
    Update: Even successfully install the plugin, it still now works properly. I have to download  6.7 version. Finally, it works.
  2. Change the IDE interface language
    If you want to change your interface to other language, simply modify the config file (in my case under Windows XP) located at “C:\Program Files\NetBeans 6.9.1\etc\netbeans.conf”,  add “–locale en” to netbeans_default_options.  It will look like: netbeans_default_options=”–locale en -J-client -J-Xss2m …”
  3. (add later)