This page contains limitations of EMF/Query2 component.
1. Exception in XText based Query Editor
Query editor which is based on XText 1.0.1, throws an NPE at times, as the complexity of the query increases. This is caused because of a bug in XText, which is fixed in version 1.0.2(yet to be released). Migration to XText 1.0.2 will happen once it is released. More details :