Cross field validation with Hibernate Validator (JSR 303)

Question

Is there an implementation of (or third-party implementation for) cross field validation in Hibernate Validator 4.x? If not, what is the cleanest way to implement a cross fi

Answer 1

With Hibernate Validator 4.1.0.Final I recommend using @ScriptAssert. Exceprt from its JavaDoc:

Script expressions can be written in any scripting or expression language, for which a JSR 223 ("Scripting for the JavaTM Platform") compatible engine can be found on the classpath.

Note: the evaluation is being performed by a scripting "engine" running in the Java VM, therefore on Java "server side", not on "client side" as stated in some comments.

Example:

@ScriptAssert(lang = "javascript", script = "_this.passVerify.equals(_this.pass)")
public class MyBean {
  @Size(min=6, max=50)
  private String pass;

  private String passVerify;
}

or with shorter alias and null-safe:

@ScriptAssert(lang = "javascript", alias = "_",
    script = "_.passVerify != null && _.passVerify.equals(_.pass)")
public class MyBean {
  @Size(min=6, max=50)
  private String pass;

  private String passVerify;
}

or with Java 7+ null-safe Objects.equals():

@ScriptAssert(lang = "javascript", script = "Objects.equals(_this.passVerify, _this.pass)")
public class MyBean {
  @Size(min=6, max=50)
  private String pass;

  private String passVerify;
}

Nevertheless, there is nothing wrong with a custom class level validator @Matches solution.