In hamcrest 1.3 you can using Matchers#isEmptyString :
assertThat(string, not(isEmptyString()));
In hamcrest 2.0 you can using Matchers#emptyString :
assertThat(string, is(not(emptyString())));
UPDATE – Notice that : “Maven central has some extra artifacts called java-hamcrest and hamcrest-java, with a version of 2.0.0.0. Please do not use these, as they are an aborted effort at repackaging the different jars.” source : hamcrest.org/JavaHamcrest/distributables