Spring注入bean为空
我正在使用springframework/Data/HATEOAS并尝试添加Dozer 我的spring-config.xml中有以下bean:Spring注入bean为空,spring,javabeans,dozer,Spring,Javabeans,Dozer,我正在使用springframework/Data/HATEOAS并尝试添加Dozer 我的spring-config.xml中有以下bean: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:data="http://www.springframework.org/schema/data/jpa"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<bean id="jpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="database" value="POSTGRESQL" />
<property name="databasePlatform" value="org.hibernate.dialect.PostgreSQLDialect" />
</bean>
<bean id="jpaDialect" class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
<property name="dataSource" ref="dataSource" />
<property name="jpaDialect" ref="jpaDialect" />
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.postgresql.Driver" />
<property name="url" value="jdbc:postgresql://localhost:5432/cp" />
<property name="username" value="cp_user" />
<property name="password" value="+JMJ+pw0m2d" />
</bean>
<context:component-scan base-package="com.mydomain.data.assembler" />
<data:repositories base-package="com.mydomain.repository" />
<mvc:annotation-driven />
<bean id="dozerFactory" class="org.dozer.spring.DozerBeanMapperFactoryBean" scope="singleton">
<property name="mappingFiles" value="classpath*:/*mapping.xml"/>
</bean>
</beans>
所以,-我对豆子和注射非常陌生-但我猜工厂豆子是吗?应该是吗?注入映射器。但是映射器绝对是空的。我知道我做得不对,但我做错了什么?Spring将其bean注入到Spring管理的bean中。您正在使用非托管静态上下文。将
UserResourceAssembler
也更改为托管bean:
@Component
public class UserResourceAssembler {
@Inject
private Mapper dozerBeanMapper;
public UserResource toResource(User user) {
}
public User toEntity(UserResource resource) {
}
}
请参阅。我更喜欢上面这样的东西。但后来我读到: 成功了。这是我的实现 我从spring配置中删除了bean,并删除了上下文扫描 我添加了这个类:
@Singleton
public class DozerInstantiator {
public static DozerBeanMapper getInstance(){
return MapperHolder.instance;
}
private static class MapperHolder{
static final DozerBeanMapper instance = new DozerBeanMapper();
}
}
并更新了我的汇编程序,如下所示:
public class UserResourceAssembler {
private DozerBeanMapper mapper;
public UserResourceAssembler() {
mapper = DozerInstantiator.getInstance();
}
public UserResource toResource(User user) {
UserResource resource = mapper.map(user, UserResource.class);
resource.add(linkTo(methodOn(UserController.class).get(user.getId())).withSelfRel());
return resource;
}
public User toEntity(UserResource resource) {
User user = mapper.map(resource, User.class);
return user;
}
}
好的,很高兴知道,我读了这篇文章和链接的答案。不幸的是,同样的事情正在发生。我已经用当前代码更新了问题。我添加了
public class UserResourceAssembler {
private DozerBeanMapper mapper;
public UserResourceAssembler() {
mapper = DozerInstantiator.getInstance();
}
public UserResource toResource(User user) {
UserResource resource = mapper.map(user, UserResource.class);
resource.add(linkTo(methodOn(UserController.class).get(user.getId())).withSelfRel());
return resource;
}
public User toEntity(UserResource resource) {
User user = mapper.map(resource, User.class);
return user;
}
}