具有Spring失败的JSR-303约束验证器中的依赖注入失败 [英] Dependency Injection in JSR-303 Constraint Validator with Spring fails
问题描述
I have the same problem as here and here but couldn't find a solution yet.
所以我的示例测试项目将显示整个相关配置和代码：
So my sample test project will show the whole relevant configuration and code:
约束注释：
@Target({ ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = FooValidator.class)
public @interface FooValid {
String message();
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
注释PoJo：
public class Foo {
@FooValid(message = "Test failed")
private Integer test;
[...]
}
带有@Validated的注释服务： / p>
Annotated Service with @Validated:
@Service
@Validated
public class FooService {
private final Test test;
@Autowired
public FooService(final Test test) {
this.test = test;
}
public void foo(@Valid final Foo foo) {
this.test.test(foo);
}
}
JSR-303 ConstraintValidator：
JSR-303 ConstraintValidator:
public class FooValidator implements ConstraintValidator<FooValid, Integer> {
@Autowired
private ValidationService validationService;
@Override
public void initialize(final FooValid constraintAnnotation) {
// TODO Auto-generated method stub
}
@Override
public boolean isValid(final Integer value, final ConstraintValidatorContext context) {
// this.validationService is always NULL!
Assert.notNull(this.validationService, "the validationService must not be null");
return false;
}
}
注入ValidationService：
Injected ValidationService:
@Service
public class ValidationService {
public void test(final Foo foo) {
System.out.println(foo);
}
}
Spring引导应用程序和配置：
Spring boot application and configuration:
@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application {
public static void main(final String[] args) {
final ConfigurableApplicationContext context = SpringApplication.run(Application.class, args);
final FooService service = context.getBean(FooService.class);
service.foo(new Foo());
}
@Bean
public static LocalValidatorFactoryBean validatorFactory() {
return new LocalValidatorFactoryBean();
}
@Bean
public static MethodValidationPostProcessor validationPostProcessor() {
return new MethodValidationPostProcessor();
}
}
相关的maven pom：
relevant maven pom:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.1.9.RELEASE</version>
<relativePath/>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<start-class>demo.Application</start-class>
<java.version>1.7</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
我正在使用 LocalValidatorFactoryBean 默认的 SpringConstraintValidatorFactory 。
但是为什么依赖注入在ConstraintValidator中不起作用，并且 ValidationService 不能自动连线？
I'm using the LocalValidatorFactoryBean with the default SpringConstraintValidatorFactory. But why the dependency injection is not working in the ConstraintValidator and the ValidationService could not be autowired?
顺便说一句，如果我不要在服务中使用 @Validated ，注入与spring或javax Validator接口相反，并手动调用 validator.validate 依赖注入将工作。但是我不想手动在每个服务中调用validate方法。
By the way if I don't use @Validated at the service, inject in opposite the spring or javax Validator interface and call manually "validator.validate" the dependency injection will work. But I don't want to call the validate method in every service manually.
非常感谢您的帮助：）
推荐答案
我在Spring Boot环境中也遇到过同样的问题，我发现Hibernate的内部实现不是配置的Spring的。当应用程序启动时，调试器在Spring的工厂中找到了一行，但是在运行时间内还有Hibernate的一个。经过一些调试，我得出结论，即 MethodValidationPostProcessor 得到了内部的。因此我配置如下：
I have fought the same problem in Spring Boot environment and I found out that Hibernate internal implementation got in instead of the configured Spring's one. When the application started, debugger caught a line with the Spring's factory but later in runtime there was Hibernate's one. After some debugging I came to the conclusion that MethodValidationPostProcessor got the internal one. Therefore I configured it as follows:
@Bean
public Validator validator() {
return new LocalValidatorFactoryBean();
}
@Bean
public MethodValidationPostProcessor methodValidationPostProcessor() {
MethodValidationPostProcessor methodValidationPostProcessor = new MethodValidationPostProcessor();
methodValidationPostProcessor.setValidator(validator());
return methodValidationPostProcessor;
}
注意验证器的设置器 - 它做了这个工作。
Note the setter for validator - it did the job.
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