If you have worked with SVN tools in Eclipse (Subversion, subversive) before, then you are likely familiar with the \'working copy \'XXX\' locked...\" error.
I found
After more exploration and testing, it appears that this issue was being caused by debugging the plugin and using breakpoints. SVN/Subclipse apparently didn't like having breakpoints midway through their execution and as a result this lock files were being created. As soon as I started just running the plugin, this issue disappeared.