将spring @value注释评估为原始布尔值 [英] Evaluating spring @value annotation as primitive boolean

问题描述

我有一个spring @configuration注释类MappingsClientConfig，其布尔字段为:

I have a spring @configuration annotated class MappingsClientConfig with a boolean field as:

 @Value("${mappings.enabled:true}")
    private boolean mappingsEnabled;

该类被导入到另一个带有弹簧注释的类中，如下所示:

This class is imported into another spring annotated class like so :

@Configuration
@Import(MappingsClientConfig.class)
public class LookupManagerConfig {

在测试用例中通过Spring上下文实例化类时，容器无法将字符串解析为布尔字段mappingsEnabled，而我得到:

when instantiating the class via Spring context in a test-case the container is unable to parse the string into the boolean field mappingsEnabled and I get:

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private boolean com.barcap.tcw.mappings.economic.client.config.EconomicMappingsClientConfig.economicMappingsEnabled; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'boolean'; nested exception is java.lang.IllegalArgumentException: Invalid boolean value [${mappings.enabled:true}]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:502)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:282)
    ... 138 more
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'boolean'; nested exception is java.lang.IllegalArgumentException: Invalid boolean value [${mappings.enabled:true}]
    at org.springframework.beans.SimpleTypeConverter.convertIfNecessary(SimpleTypeConverter.java:61)
    at org.springframework.beans.SimpleTypeConverter.convertIfNecessary(SimpleTypeConverter.java:43)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:718)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:703)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:474)
    ... 140 more
Caused by: java.lang.IllegalArgumentException: Invalid boolean value [${mappings.enabled:true}]
    at org.springframework.beans.propertyeditors.CustomBooleanEditor.setAsText(CustomBooleanEditor.java:124)
    at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:416)
    at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:388)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:157)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:93)
    at org.springframework.beans.SimpleTypeConverter.convertIfNecessary(SimpleTypeConverter.java:49)
    ... 144 more

有人想念我想念什么吗?

Any leads as to what am I missing?

推荐答案

好像您缺少PropertyPlaceholderConfigurer.您需要将其注册为Bean工厂后处理器.从理论上讲，可以这样做:

Looks like you're missing the PropertyPlaceholderConfigurer. You need to register it as a bean factory post processor. Theoretically this could be done like this:

public class PostProcessorConfig {

    @Bean
    public BeanFactoryPostProcessor getPP() {
       PropertyPlaceholderConfigurer configurer = new PropertyPlaceholderConfigurer();
       configurer.setLocations(new Resource[]{new ClassPathResource("/my.properties")});
       return configurer;
    }
}

但是，似乎有一个错误会导致其他问题基于Java的配置.解决方法请参阅票证.

However, there seems to be a bug that causes other issues doing this from a java based configuration. See ticket for workarounds.

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