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How to get the Eclipse installation directory through programming in swt/java. I actually want to get the plugins directory of the eclipse.

Abhishek Choudhary
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2 Answers2

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Update (January 2012)
James Moore mentions in the comments that the FAQ and API are quite old.

FileLocator.resolve(URL) is now preferred to the deprecated Platform.resolve().

As this example shows, you need to pass the actual resource (here a bundle), not the name of the resource, in order to resolve it:

private static URI locateFile(String bundle, String fullPath) {
  try {
    URL url = FileLocator.find(Platform.getBundle(bundle), new Path(fullPath), null);
    if(url != null)
      return FileLocator.resolve(url).toURI();
  } catch (Exception e) {}
    return null;
  }
}

See also "How to refer a file from jar file in eclipse plugin" for more.

Original answer (January 2011)

Maybe the FAQ "How do I find out the install location of a plug-in?" can help here:

You should generally avoid making assumptions about the location of a plug-in at runtime.
To find resources, such as images, that are stored in your plug-in’s install directory, you can use URLs provided by the Platform class. These URLs use a special Eclipse Platform protocol, but if you are using them only to read files, it does not matter.

In Eclipse 3.1 and earlier, the following snippet opens an input stream on a file called sample.gif located in a subdirectory, called icons, of a plug-in’s install directory:

  Bundle bundle = Platform.getBundle(yourPluginId);
  Path path = new Path("icons/sample.gif");
  URL fileURL = Platform.find(bundle, path);
  InputStream in = fileURL.openStream();

If you need to know the file system location of a plug-in, you need to use Platform.resolve(URL). This method converts a platform URL to a standard URL protocol, such as HyperText Transfer Protocol (HTTP), or file.
Note that the Eclipse Platform does not specify that plug-ins must exist in the local file system, so you cannot rely on this method’s returning a file system URL under all circumstances in the future.

In Eclipse 3.2, the preferred method seems to be:

  Bundle bundle = Platform.getBundle(yourPluginId);
  Path path = new Path("icons/sample.gif");
  URL fileURL = FileLocator.find(bundle, path, null);
  InputStream in = fileURL.openStream();
Community
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VonC
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  • Thanks for the above but I've a doubt.Consider I have an plug-in project named com.abhishek.html.test and inside it I've a folder named html carrying few html files. Now I want to read those html in plug-in, then which approach I should follow. Locally it works but how a plug-in will detect the folder named html ? – Abhishek Choudhary Jan 18 '11 at 09:28
  • @Abhishek: I am not sure about the "locally it works". As opposed to what configuration exactly? Because your program should be able to detect the `html` folder in the plugin by getting the bundle and using `FileLocator`. It should return null (or throw an exception, I forgot which) if `html` don't exist within that plugin. – VonC Jan 18 '11 at 12:01
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    That FAQ entry is horrible. 3.[1,2] are ancient - why not talk about recent releases? It recommends using Platform.resolve, but Platform.resolve is marked "Deprecated. use FileLocator.resolve(URL) instead" And why in the world is a FAQ saying something like "the preferred method seems to be"? Why qualify with such wishy-washy language? – James Moore Feb 01 '12 at 20:39
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    @JamesMoore: good point. I have updated the answer in order to reflect the right API and added references to examples. – VonC Feb 01 '12 at 22:19
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Use the below code to get the plugin path :

this.getClass().getProtectionDomain().getCodeSource().getLocation().getPath();
V_Dev
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  • what Class is that 'this' object? – emecas Jun 27 '16 at 12:42
  • this - user defined class object In which the above code is used.for ex. if you have a class Myclass.java then the above code can be used like "Myclass.class.getClass().getProtectionDomain().getCodeSource().getLocation().getPath();" – V_Dev Jun 28 '16 at 05:30