如何在Spring Boot中修复“ ConditionalOnProperty独占”？

Question

考虑一个代码：

package com.hellokoding.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class WebApplication extends SpringBootServletInitializer {

    @Bean
    @ConditionalOnProperty(prefix = "config.prefix", name = "name", value = "SOMEVALUE", matchIfMissing = true)
    public BeanOne beanOne() {
        System.out.println("ok");
        return new BeanOne();
    }
    @Bean
    @ConditionalOnProperty(prefix = "config.prefix", name = "name", value = "OTHERVALUE")
    public BeanTwo beanTwo() {
        System.out.println("ok");
        return new BeanTwo();
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(WebApplication.class);
    }

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

这是一个带有代码的git repo。 当我启动spring boot时，出现异常：

java.lang.IllegalStateException: Error processing condition on com.hellokoding.springboot.WebApplication.beanOne
    at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:64) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:102) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod(ConfigurationClassBeanDefinitionReader.java:178) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:140) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:116) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:333) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:243) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:273) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:98) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:678) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:520) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at com.hellokoding.springboot.WebApplication.main(WebApplication.java:32) [classes/:na]
Caused by: java.lang.IllegalStateException: The name and value attributes of @ConditionalOnProperty are exclusive
    at org.springframework.util.Assert.state(Assert.java:392) ~[spring-core-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.boot.autoconfigure.condition.OnPropertyCondition.getNames(OnPropertyCondition.java:152) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.autoconfigure.condition.OnPropertyCondition.determineOutcome(OnPropertyCondition.java:106) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.autoconfigure.condition.OnPropertyCondition.findNoMatchOutcomes(OnPropertyCondition.java:91) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.autoconfigure.condition.OnPropertyCondition.getMatchOutcome(OnPropertyCondition.java:53) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47) ~[spring-boot-autoconfigure-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    ... 17 common frames omitted

怎么了？？？ Oo该属性存在，语法非常简单，看起来像示例中的...

PS所有这些看起来都很简单，因为许多spring boot config的前缀和值都具有相同的ConditionalOnProperty，如果存在错误，则它们都将无法工作。

Answer 1

value param由name别名导致此错误。 即它们实际上是相同的参数。

您将需要将value交换为havingValue

@ConditionalOnProperty(prefix = "config.prefix", name = "name", havingValue = "OTHERVALUE")

@ConditionalOnProperty(prefix = "config.prefix", name = "name", havingValue = "SOMEVALUE", matchIfMissing = true)