Using Subversion externals for files

I needed to use Subversion externals property to define a reference to a file. Based on this blog, here are my notes:

Let’s say that you want to have Subversion to use the following file from another directory: https://mysvnserver.com/svn/shared/lib/thelib.jar

And have the file download into the following file in your project: myproject/lib/thelib.jar You should have lib directory already exist.

Within your myproject folder, create a text file. This is necessary if you plan to have multiple references.

$ cat > svn_externals_config.txt
lib/thelib.jar https://mysvnserver.com/svn/shared/lib/thelib.jar

Use Ctrl-D to exit the data entry mode. Alternatively, you can use your favourite text editor to create the text file.

If you want to reference a folder instead, you can have the following definition:

lib/aThirdPartyLibFolder https://mysvnserver.com/svn/shared/lib/aThirdPartyLibFolder

Make sure that the local lib folder doesn’t have aThirdPartyLibFolder or you may get the following error: svn: warning: Working copy 'aThirdPartyLibFolder' locked.

Now you can set the svn:externals property by running the following lines:

svn propset svn:externals . -F svn_externals_config.txt
svn update

Once you are set, you can commit the externals definition by running the following command:

svn commit --depth empty . -m "Modify svn externals definition only."

Subclipse on Fedora

Update 20110926: In Fedora 15, you can just install subversion-javahl-1.6.17-1.fc15 from Add/Remove Software tool, much easier than the method described earlier. :)


When trying to run Subclipse, I got the following error: Failed to load JavaHL Library. To get JavaHL loaded for Subclipse on Fedora, I had to first register on Collabnet before attempt to install JavaHL rpm from this location. Once installed, I had to run export LD_LIBRARY_PATH=/opt/CollabNet_Subversion/lib on the command line before running eclipse.

This above tip is the result of combining the howto from this and this page.

JavaOne 2010 Related Links

Here are some information that I found on the net about JavaOne 2010. Feel free to comment with additional resources. To start, Oracle posted some video highlights. If you have JavaOne login, you can view the full versions at On Demand site. If not, you can still see some of the contents here. Beyond that, here are posts from various speakers on their talks and related links.