My groovy HBase client had the following dependencies declared in grab
@Grab(group='org.apache.hbase', module='hbase', version='0.90.4')
@Grab(group='org.apache.hadoop', module='hadoop-core', version='0.20.2')
It threw the following exception
General error during conversion: Error grabbing Grapes -- [unresolved dependency: org.apache.thrift#thrift;0.2.0: not found]
After adding the following grab resolver, it worked!
@GrabResolver(name='Apache Psmith', root='http://people.apache.org/~psmith/hbase/repo')