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The code has reference to net.sf.oval validators that are not used by the services.

64a8e983 demonstrates use of Bean Validation 1.1.0 API in services:

import javax.validation.Valid;
import org.springframework.validation.annotation.Validated;

...
	@Validated
	public <T extends Dimension<?>> T save(@Valid T dimension) {
		LOG.debug("Persisting dimension {}", dimension);
		return dimensionRepository.save(dimension);
	}

When implementing new service methods please use @Valid on model arguments where applicable.

Models use

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

...
	@NotNull
	@Size(max = 100)
	@Column(length = 100, unique = true, nullable = false)
	private String name;