java - Spring Hibernate自定义bean验证 - NullPointerException

我尝试使用注释和ConstraintValidator接口创建自定义bean验证。目的是使模型的名称独一无二。我不知道为什么，但是当我提交表单以添加产品时，会抛出NullPointerException。显示java.lang.NullPointerException pl.dsdev.validator.UniqueNameValidator.isValid（UniqueNameValidator.java:20）型号类： @实体公共类产品{ @ID @GeneratedValue 私人长身份; @NotNull（消息=＆＃34;名称是必需的＆＃34;） @ Size.List（{@ Size（min = 3，message =＆＃34;必须长于{min}个字符＆＃34;），@ Size（max = 25，message =＆＃34;必须小于{最多}个字符＆＃34;）}） @UniqueName（message =＆＃34;此名称由其他产品使用。＆＃34;）私有字符串名称; 注释界面： @target（ElementType.FIELD） @Retention（RetentionPolicy.RUNTIME） @Constraint（validatedBy = UniqueNameValidator.class） public @interface UniqueName { 字符串message（）默认＆＃34;＆＃34 ;; 类＆lt;？＆gt; [] groups（）默认{}; 类＆LT ;?扩展Payload＆gt; [] payload（）default {}; } ConstraintValidator的实现：公共类UniqueNameValidator实现ConstraintValidator＆lt; UniqueName，String＆gt; { @Autowired private ProductService productService; public void initialize（UniqueName uniqueName）{ } public boolean isValid（String name，ConstraintValidatorContext constraintValidatorContext）{ return productService.findByName（name）== null; } public ProductService getProductService（）{ return productService; } public void setProductService（ProductService productService）{ this.productService = productService; } } 我的root-context.xml文件：＆lt;？xml version =＆＃34; 1.0＆＃34;编码=＆＃34; UTF-8＆＃34;＆GT; ＆lt; beans xmlns =＆＃34; http：//www.springframework.org/schema/beans" 的xmlns：=的xsi＆＃34; HTTP：//www.w3.org/2001/XMLSchema-instance" 的xmlns：上下文=＆＃34; HTTP：//www.springframework.org/schema/context" 的xmlns：MVC =＆＃34; HTTP：//www.springframework.org/schema/mvc"的xmlns：TX =＆＃34; HTTP：//www.springframework.org/schema/tx" 的xmlns：P =＆＃34; HTTP：//www.springframework.org/schema/p" xsi：schemaLocation =＆＃34; http：//www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/ schema / context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring -mvc.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> ＆lt; context：component-scan base-package =＆＃34; pl.dsdev＆＃34; /＆GT; ＆lt; mvc：annotation-driven /＆gt; ＆lt;！ - 将@Controllers选择用于呈现的视图解析为/ WEB-INF / views目录中的.jsp资源 - ＆gt; ＆lt; bean class =＆＃34; org.springframework.web.servlet.view.InternalResourceViewResolver＆＃34;＆gt; ＆lt; property name =＆＃34; prefix＆＃34;值=＆＃34; / WEB-INF /视图/＆＃34; /＆GT; ＆lt; property name =＆＃34; suffix＆＃34;值=＆＃34; .JSP＆＃34; /＆GT; ＆LT; /豆腐＆GT; ＆lt; bean id =＆＃34; dataSource＆＃34;类=＆＃34; org.apache.commons.dbcp.BasicDataSource＆＃34;破坏法=＆＃34;靠近＆＃34;＆GT; ＆lt; property name =＆＃34; driverClassName＆＃34;值=＆＃34; com.mysql.jdbc.Driver＆＃34; /＆GT; ＆lt; property name =＆＃34; url＆＃34;值=＆＃34; JDBC：MySQL的：//本地主机：3306 / springbaza＆＃34; /＆GT; ＆lt; property name =＆＃34; username＆＃34;值=＆＃34;教程＆＃34; /＆GT; ＆lt; property name =＆＃34; password＆＃34;值=＆＃34;密码＆＃34; /＆GT; ＆LT; /豆腐＆GT; ＆lt; bean id =＆＃34; entityManagerFactory＆＃34;类=＆＃34; org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean＆＃34;＆GT; ＆lt; property name =＆＃34; dataSource＆＃34; REF =＆＃34;数据源＆＃34; /＆GT; ＆lt; property name =＆＃34; packagesToScan＆＃34;值=＆＃34; pl.dsdev.model＆＃34; /＆GT; ＆lt; property name =＆＃34; jpaVendorAdapter＆＃34;＆gt; ＆lt; bean class =＆＃34; org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter＆＃34; /＆GT; ＆LT; /性＆gt; ＆lt; property name =＆＃34; jpaProperties＆＃34;＆gt; ＆LT;道具＆GT; ＆lt; prop key =＆＃34; hibernate.hbm2ddl.auto＆＃34;＆gt; create＆lt; / prop＆gt; ＆lt; prop key =＆＃34; hibernate.dialect＆＃34;＆gt; org.hibernate.dialect.MySQL5Dialect＆lt; / prop＆gt; ＆lt; prop key =＆＃34; hibernate.show_sql＆＃34;＆gt; true＆lt; / prop＆gt; ＆LT; /道具＆GT; ＆LT; /性＆gt; ＆LT; /豆腐＆GT; ＆lt; tx：注释驱动/＆gt; ＆lt; bean id =＆＃34; transactionManager＆＃34;类=＆＃34; org.springframework.orm.jpa.JpaTransactionManager＆＃34;＆GT; ＆lt; property name =＆＃34; entityManagerFactory＆＃34; REF =＆＃34;的entityManagerFactory＆＃34; /＆GT; ＆LT; /豆腐＆GT; ＆lt; bean id =＆＃34; persistenceExceptionTranslationPostProcessor＆＃34;类=＆＃34; org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor＆＃34; /＆GT; ＆lt; bean id =＆＃34; messageSource＆＃34;类=＆＃34; org.springframework.context.support.ResourceBundleMessageSource＆＃34;＆GT; ＆lt; property name =＆＃34; basename＆＃34;值=＆＃34;验证＆＃34; /＆GT; ＆LT; /豆腐＆GT; ＆lt; bean id =＆＃34;验证器＆＃34; 类=＆＃34; org.springframework.validation.beanvalidation.LocalValidatorFactoryBean＆＃34; /＆GT;

Spring Hibernate自定义bean验证 - NullPointerException

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