Github user glitch commented on the issue: https://github.com/apache/accumulo/pull/289 Ok a brief update. For the transitive dependencies, this is what adding jersey-bean-validation brings along based on `mvn dependency:tree` [INFO] +- org.glassfish.jersey.ext:jersey-bean-validation:jar:2.25.1:compile [INFO] | +- org.hibernate:hibernate-validator:jar:5.1.3.Final:compile [INFO] | | +- org.jboss.logging:jboss-logging:jar:3.1.3.GA:compile [INFO] | | \- com.fasterxml:classmate:jar:1.0.0:compile [INFO] | +- javax.el:javax.el-api:jar:2.2.4:compile [INFO] | \- org.glassfish.web:javax.el:jar:2.2.4:compile I was able to get some basic unit testing set up on the REST endpoints testing for validation. You can see that here: https://github.com/glitch/accumulo/commit/403b2adc2c6569eff6415ba6a64a2d95eb6f68d5 The annotation based constraints on parameters actually works pretty nicely. As of now, failing a constraint will return a 400 response with a pretty generic message; however, there is the ability to tailor the responses/messages. For a look at the annotations you can see what they look like here: https://github.com/glitch/accumulo/commit/2e010deb8f40e9c6476ae4890d0b8de84c7f4274 I'm going to add some more unit testing and will merge those changes into the current pull-request.
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