Dubbo 整合 quartz NullPointerException错误解决

环境信息

• dubbo 2.6.5

• spring-boot-starter-quartz 2.0.6.RELEASE

• spring boot 2.0.6.RELEASE

NPE错误信息

org.quartz.SchedulerException: Job instantiation failed
    at org.springframework.scheduling.quartz.AdaptableJobFactory.newJob(AdaptableJobFactory.java:47) ~[spring-context-support-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.quartz.core.JobRunShell.initialize(JobRunShell.java:127) ~[quartz-2.3.0.jar:na]
    at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:392) [quartz-2.3.0.jar:na]
Caused by: java.lang.NullPointerException: null
    at com.alibaba.dubbo.config.spring.beans.factory.annotation.DubboConfigBindingBeanPostProcessor.postProcessBeforeInitialization(DubboConfigBindingBeanPostProcessor.java:79) ~[dubbo-2.6.5.jar:2.6.5]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:416) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1686) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:407) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.boot.autoconfigure.quartz.AutowireCapableBeanJobFactory.createJobInstance(AutowireCapableBeanJobFactory.java:45) ~[spring-boot-autoconfigure-2.0.6.RELEASE.jar:2.0.6.RELEASE]
    at org.springframework.scheduling.quartz.AdaptableJobFactory.newJob(AdaptableJobFactory.java:43) ~[spring-context-support-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    ... 2 common frames omitted
​

NullPointerException 原因分析

spring-boot-autoconfigure-2.0.2.RELEASE.jar->AutowireCapableBeanJobFactory.java

    protected Object createJobInstance(TriggerFiredBundle bundle) throws Exception {
        Object jobInstance = super.createJobInstance(bundle);
        this.beanFactory.autowireBean(jobInstance);
        this.beanFactory.initializeBean(jobInstance, (String)null);
        return jobInstance;
    }

注意，上面创建job实列时候，赋值的bean的name为 `null

dubbo-2.6.5.jar>DubboConfigBindingBeanPostProcessor.java

    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        if (beanName.equals(this.beanName) && bean instanceof AbstractConfig) {
            AbstractConfig dubboConfig = (AbstractConfig)bean;
            this.bind(this.prefix, dubboConfig);
            this.customize(beanName, dubboConfig);
        }
​
        return bean;
    }

提示，dubbo在使用beanName的时候未作空验证，导致NullPointerException

解决办法

根据dubbo的说法升级spring boot 版本，参考https://github.com/apache/dubbo/issues/2429

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.5.RELEASE</version>
        <relativePath/> 
    </parent>

测试通过，升级到 2.1.9.RELEASE , 2.1.18.RELEASE ，2.3.5.RELEASE

application.properties 文件增加配置

spring.main.allow-bean-definition-overriding=true

提示：如果application.properties文件不添加上方配置可能在启动时候报错当dubbo版本为（2.6.9）时候，2.6.5版本不会