Spring @Configurable类不能自动连接其依赖项的问题

Question

我正在尝试为我的Spring Boot应用程序配置加载时编织，以正确地自动连接对< code>@Configurable java类的依赖。

下面是我的配置/主类:

package com.bignibou;

@Configuration
@EnableAutoConfiguration(exclude = { SecurityAutoConfiguration.class, ThymeleafAutoConfiguration.class, FlywayAutoConfiguration.class })
@EnableSpringConfigured
@EnableLoadTimeWeaving(aspectjWeaving = AspectJWeaving.ENABLED)
@ComponentScan
public class Application {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class, args);
    }
}

以下是我如何启动应用程序（我的 gradle 版本重命名为 spring-instrument jar）：

java -javaagent:build/lib/springinstrument.jar -jar myapp.jar

下面是@Configurable个不自动连接其依赖项的类：

package com.bignibou.converter;

@Configurable
public class StringToDayToTimeSlotConverter implements Converter<String, DayToTimeSlot> {

    @Autowired
    private DayToTimeSlotRepository dayToTimeSlotRepository;//NOT AUTOWIRED!!

    @Override
    public DayToTimeSlot convert(String id) {
        return dayToTimeSlotRepository.findOne(Long.parseLong(id));//NPE HERE!!
    }

}

这里的类被实例化(<鳕鱼

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "com.bignibou.controller" }, useDefaultFilters = false, includeFilters = { @Filter(type = FilterType.ANNOTATION, value = Controller.class),
        @Filter(type = FilterType.ANNOTATION, value = ControllerAdvice.class) })
@Import(ApplicationControllerAdvice.class)
public class WebMvcConfiguration extends WebMvcConfigurerAdapter {

    ...

    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(new DayToTimeSlotToStringConverter());
        registry.addConverter(new StringToDayToTimeSlotConverter());//INSTANTIATED HERE!
        registry.addConverter(new LanguageToStringConverter());
        registry.addConverter(new StringToLanguageConverter());
        registry.addConverter(new AddressToStringConverter());
        registry.addConverter(new StringToAddressConverter());
        super.addFormatters(registry);
    }

谁能请帮助弄清楚为什么<代码>字符串

Answer 1

非常老的问题，至少有一个解决方案的建议，我会把它变成一个答案，这样问题就可以“关闭”了。将< code > StringToDayToTimeSlotConverter 转换为Bean，如下所示:

@Bean
public class StringToDayToTimeSlotConverter implements Converter<String, DayToTimeSlot> {

    @Autowired
    private DayToTimeSlotRepository dayToTimeSlotRepository;

    @Override
    public DayToTimeSlot convert(String id) {
        return dayToTimeSlotRepository.findOne(Long.parseLong(id));
    }
}

在WebMvc配置中注入所有可用的转换器，如下所示：

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "com.bignibou.controller" }, useDefaultFilters = false, includeFilters = { @Filter(type = FilterType.ANNOTATION, value = Controller.class),
        @Filter(type = FilterType.ANNOTATION, value = ControllerAdvice.class) })
@Import(ApplicationControllerAdvice.class)
public class WebMvcConfiguration extends WebMvcConfigurerAdapter {

    @Autowired
    List<Converter> converters;

    @Override
    public void addFormatters(FormatterRegistry registry) {
        for (Converter converter : converter) {
            registry.addConverter(converter);
        }
        super.addFormatters(registry);
    }
}