目前我正在解决一个非常奇怪的问题。我的基本目标是使用Bean Validation来验证一些(非JPA)对象。但由于对象类是自动生成的,我目前只能使用xml定义验证规则。
因为我使用的是Hibernate-Validator作为参考实现,我已经将必要的Maven依赖项添加到项目中,并编写了一个简单的XML验证映射和测试。
当执行测试时,我遇到了一个异常。
javax.validation.ValidationException: HV000123: Unable to parse META-INF/validation.xml.
at org.hibernate.validator.internal.xml.XmlParserHelper.getSchemaVersion(XmlParserHelper.java:112)
...
Caused by: java.io.IOException: Stream closed
at java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:156)
at java.io.BufferedInputStream.reset(BufferedInputStream.java:425)
at org.hibernate.validator.internal.xml.XmlParserHelper.getSchemaVersion(XmlParserHelper.java:109)
... 29 more
有趣的是,在XmlParserHelper.getSchemaVersion(...)的finally块中抛出了IOException异常。这是怎么回事?可能是什么原因导致了这个错误?以下是有关设置的更多信息。
验证文件位于src/main/resources/META-INF(validation.xml和constraints.xml),如下所示:
validation.xml:
<validation-config xmlns="http://jboss.org/xml/ns/javax/validation/configuration"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/configuration">
<default-provider>org.hibernate.validator.HibernateValidator</default-provider>
<message-interpolator>org.hibernate.validator.engine.ResourceBundleMessageInterpolator</message-interpolator>
<traversable-resolver>org.hibernate.validator.engine.resolver.DefaultTraversableResolver</traversable-resolver>
<constraint-validator-factory>org.hibernate.validator.engine.ConstraintValidatorFactoryImpl</constraint-validator-factory>
<constraint-mapping>/constraints.xml</constraint-mapping>
</validation-config>
constraints.xml:
<constraint-mappings xmlns="http://jboss.org/xml/ns/javax/validation/mapping"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/mapping validation-mapping-1.1.xsd">
<default-package>com.nano</default-package>
<bean class="Person">
<field name="familyName">
<constraint annotation="javax.validation.constraints.Size">
<element name="min">4</element>
</constraint>
</field>
</bean>
</constraint-mappings>
项目中相关的maven依赖如下:
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.1.3.Final</version>
</dependency>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>2.2.4</version>
</dependency>
异常发生的测试是一个非常基本的概念验证测试,其执行以下操作:
Person p = new Person();
p.setFamilienName("x");
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
Set<ConstraintViolation<Person>> violations = validator.validate(p);
assertEquals(1, violations);