weblogic 中 hibernate Validator 解决 jar 冲突

在 tomcat 环境中 hibernate Validator 会默认在 classpath 中找 PersistenceProvider 的实现（eclipse.persistence.PersistenceProviderImpl）;
而在 weblogic 中亦然，但实现找的确是（javax.persistence.spi.PersistenceProvider） 所以会发生类转换异常.

解决办法:

自定义 TraversableResolver, 基于@Configuration @Bean 配置 Validator

代码如下:

import java.lang.annotation.ElementType;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.Path;
import javax.validation.Path.Node;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.validation.TraversableResolver;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;


@Configuration
public class BeanValidators implements TraversableResolver{

@Override
public boolean isReachable(Object traversableObject, Node traversableProperty, Class<?> rootBeanType,
		Path pathToTraversableObject, ElementType elementType) {
	return true;
}

@Override
public boolean isCascadable(Object traversableObject, Node traversableProperty, Class<?> rootBeanType,
		Path pathToTraversableObject, ElementType elementType) {
	return true;
}

/**
 * 配置 Validator
 * @return
 */
@Bean
public Validator validator(){
	ValidatorFactory factory = Validation.byDefaultProvider()
			.configure().traversableResolver(this)
			.buildValidatorFactory();
			return  factory.getValidator();
}



/**
 * 调用JSR303的validate方法, 验证失败时抛出ConstraintViolationException.
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
public static void validateWithException(Validator validator, Object object, Class<?>... groups)
		throws ConstraintViolationException {
	Set constraintViolations = validator.validate(object, groups);
	if (!constraintViolations.isEmpty()) {
		throw new ConstraintViolationException(constraintViolations);
	}
}

/**
 * 辅助方法, 转换ConstraintViolationException中的Set<ConstraintViolations>中为List<message>.
 */
public static List<String> extractMessage(ConstraintViolationException e) {
	return extractMessage(e.getConstraintViolations());
}

/**
 * 辅助方法, 转换Set<ConstraintViolation>为List<message>
 */
@SuppressWarnings("rawtypes")
public static List<String> extractMessage(Set<? extends ConstraintViolation> constraintViolations) {
	List<String> errorMessages = Lists.newArrayList();
	for (ConstraintViolation violation : constraintViolations) {
		errorMessages.add(violation.getMessage());
	}
	return errorMessages;
}

/**
 * 辅助方法, 转换ConstraintViolationException中的Set<ConstraintViolations>为Map<property, message>.
 */
public static Map<String, String> extractPropertyAndMessage(ConstraintViolationException e) {
	return extractPropertyAndMessage(e.getConstraintViolations());
}

/**
 * 辅助方法, 转换Set<ConstraintViolation>为Map<property, message>.
 */
@SuppressWarnings("rawtypes")
public static Map<String, String> extractPropertyAndMessage(Set<? extends ConstraintViolation> constraintViolations) {
	Map<String, String> errorMessages = Maps.newHashMap();
	for (ConstraintViolation violation : constraintViolations) {
		errorMessages.put(violation.getPropertyPath().toString(), violation.getMessage());
	}
	return errorMessages;
}

/**
 * 辅助方法, 转换ConstraintViolationException中的Set<ConstraintViolations>为List<propertyPath message>.
 */
public static List<String> extractPropertyAndMessageAsList(ConstraintViolationException e) {
	return extractPropertyAndMessageAsList(e.getConstraintViolations(), " ");
}

/**
 * 辅助方法, 转换Set<ConstraintViolations>为List<propertyPath message>.
 */
@SuppressWarnings("rawtypes")
public static List<String> extractPropertyAndMessageAsList(Set<? extends ConstraintViolation> constraintViolations) {
	return extractPropertyAndMessageAsList(constraintViolations, " ");
}

/**
 * 辅助方法, 转换ConstraintViolationException中的Set<ConstraintViolations>为List<propertyPath +separator+ message>.
 */
public static List<String> extractPropertyAndMessageAsList(ConstraintViolationException e, String separator) {
	return extractPropertyAndMessageAsList(e.getConstraintViolations(), separator);
}

/**
 * 辅助方法, 转换Set<ConstraintViolation>为List<propertyPath +separator+ message>.
 */
@SuppressWarnings("rawtypes")
public static List<String> extractPropertyAndMessageAsList(Set<? extends ConstraintViolation> constraintViolations,
		String separator) {
	List<String> errorMessages = Lists.newArrayList();
	for (ConstraintViolation violation : constraintViolations) {
		errorMessages.add(violation.getPropertyPath() + separator + violation.getMessage());
	}
	return errorMessages;
}

}