private File buildCoprocessorJar(String className) throws Exception {
    String dataTestDir = TEST_UTIL.getDataTestDir().toString();
    String code = String.format("import org.apache.hadoop.hbase.coprocessor.*; public class %s"
      + " implements RegionCoprocessor {}", className);
    return ClassLoaderTestHelper.buildJar(dataTestDir, className, code);
  }
An {@link Abortable} implementation for tests.
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestCoprocessorHost.java