SpringBoot+Shiro+redis配置文件@value取值为空

参考文章:这里

出现原因

@Bean
    public  LifecycleBeanPostProcessor getLifecycleBeanPostProcessor() {
        return new LifecycleBeanPostProcessor();
    }

LifecycleBeanPostProcessor用于在实现了Initializable接口的Shiro bean初始化时调用Initializable接口回调,在实现了Destroyable接口的Shiro bean销毁时调用 Destroyable接口回调。在配置类中,该Bean提前调用了未初始化的资源导致了null异常。参考如下解释:

SpringBoot+Shiro+redis配置文件@value取值为空_第1张图片

解决方案两种

  • 将LifecycleBeanPostProcessor 这个bean放到单独的Config文件中去
  • 在该方法前增加static,如下:
@Bean
    public static LifecycleBeanPostProcessor getLifecycleBeanPostProcessor() {
        return new LifecycleBeanPostProcessor();
    }

后记

若在yml文件中配置port,host,timeout等出现timeout和max-active报错,这是因为这两个类型不是int 而是duration,可以改为如下:

spring  
  redis:
    host: localhost
    port: 6379
    jedis:
      pool:
        max-idle: 8
        min-idle: 0
        max-active: 8
        max-wait: -1ms
    timeout: 2000ms

此时需注意:在shiroConfig中@value取timeout的时候类型不可以是int,因为timeout实际上是2000ms是String类型,否则会报错格式转换异常

2018-09-27 15:54:34.771  WARN 13064 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'shiroConfig': Unsatisfied dependency expressed through field 'timeout'; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'int'; nested exception is java.lang.NumberFormatException: For input string: "2000ms"
2018-09-27 15:54:34.771  INFO 13064 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-09-27 15:54:34.787 ERROR 13064 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'shiroConfig': Unsatisfied dependency expressed through field 'timeout'; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'int'; nested exception is java.lang.NumberFormatException: For input string: "2000ms"

 

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