Yes, probably we should not support Optional for fields. Also parameters are dubious (the JDK team discourages that afaik). But supporting it for return values (and getter-based properties) seems reasonable.2016-11-21 14:32 GMT+01:00 Emmanuel Bernard <emmanuel@hibernate.org>:______________________________On 7 Nov 2016, at 23:42, Hendrik Ebbers <hendrik.ebbers@me.com> wrote:
I don’t think that support for Optional is that important since having a field of type Optional looks like an anti-pattern to me. Normally Optional should be used as a method return type and not as a type for a field. Supporting it in the bean validation might end in strange model classes.
Example:
The following model looks good to me:
public class Model {
@NotNull
private String name;
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public Optional<String> name() { return Optional.ofNullable(name);}
}
On the other hand this looks like an anti-pattern to me:
public class Model {
@NotNull
private Optional<String> name;
public Optional<String> getName() { return name; }
public void setName(String name) { this.name = Optional.ofNullable(name); }
}Yes Optional on a property is deemed an anti pattern by the JDK team but since Bean Validation supports contraints on method parameters and return values, this is still a valid use caseOptional<@Email String> getUserEmail(@NotNull UUID userId);Emmanuel_________________
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