Evaluating spring @value annotation as primitive boolean

Question

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

 @Value(\"${mappings.enabled:true}\")
    private boolean mappi         


        

Answer 1

This is how it was solved in our project, as the other answers didn't work for us. We were using spring batch, also.

main job config:

@Configuration
@EnableBatchProcessing
@PropertySource("classpath:application.properties")
public class MainJobConfiguration {
    @Autowired
    PipelineConfig config;

    @Bean
    public PipelineConfig pipelineConfig(){
        return new PipelineConfig();
    }

    // To resolve ${} in @Value
    @Bean
    public static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {
        return new PropertySourcesPlaceholderConfigurer();
    }

    // job stuff ...
}

properties config loader:

public class PipelineConfig {
    @Value("${option}")
    private boolean option;
}

Note how the @Value is in the PipelineConfig, but the actual properties from which the option is loaded, is specified in the job class.

Answer 2

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;
    }
}

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

Answer 3

Its an old thread but if you still want to inject Non-String values using @Value Spring annotation, do this:

@Value("#{new Boolean('${item.priceFactor}')}")
private Boolean itemFactorBoolean;

@Value("#{new Integer('${item.priceFactor}')}")
private Integer itemFactorInteger;

Works for me on Spring boot 1.5.9 with Java 8.

Answer 4

You even do not need a properties file, e.g.:

    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" />