Eclipse Subversive Plugin : Checkout operation for '...' failed. Java heap space

The problem is caused by a bug in the SVNKit connector, so the solution is to use the JavaHL connector:

1. in eclipse go to Help –> Install New Software…
2. Work with: –> choose the community.polarion.com update site
3. expand Subversive SVN Connectors
4. choose the JavaHL version corresponding with your version of subversion
5. click Next, and then follow the instructions to complete installation
6. Window –> Preferences –> expand "Team" –> select "SVN" –> select the "SVN Connector" tab –> change the SVN Connector to JavaHL –> OK

Resource:

http://bmaupin.wordpress.com/2012/06/05/eclipse-subversive-plugin-out-of-java-heap-space/