I developed my own JobListener，but i don't know how to use it. can you give me some examples for using it? help me ,thanks

[dolphin-bear]

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[TeslaCN]

Hi @dolphin-bear
JobListener is discovered by SPI.

1. You may specify your implementation under
   META-INF/services/org.apache.shardingsphere.elasticjob.infra.listener.ElasticJobListener like the following file.
   https://github.com/apache/shardingsphere-elasticjob/blob/master/elasticjob-lite/elasticjob-lite-core/src/test/resources/META-INF/services/org.apache.shardingsphere.elasticjob.infra.listener.ElasticJobListener

2. Specify the type of your implementation in JobConfiguration.

[dolphin-bear]

implements ElasticJobListener is OK, but extends AbstractDistributeOnceElasticJobListener is wrong. why ?

exception like this:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.apache.shardingsphere.elasticjob.lite.spring.boot.job.ElasticJobBootstrapConfiguration': Invocation of init method failed; nested exception is java.util.ServiceConfigurationError: org.apache.shardingsphere.elasticjob.infra.listener.ElasticJobListener: Provider elasticjob.listeners.MyDistributeOnceJobListener could not be instantiated
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:139) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:414) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1770) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:240) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:721) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:534) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at elasticjob.SchedulingApplication.main(SchedulingApplication.java:9) [classes/:na]
Caused by: java.util.ServiceConfigurationError: org.apache.shardingsphere.elasticjob.infra.listener.ElasticJobListener: Provider elasticjob.listeners.MyDistributeOnceJobListener could not be instantiated
at java.util.ServiceLoader.fail(ServiceLoader.java:232) ~[na:1.8.0_172]
at java.util.ServiceLoader.access$100(ServiceLoader.java:185) ~[na:1.8.0_172]
at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:384) ~[na:1.8.0_172]
at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404) ~[na:1.8.0_172]
at java.util.ServiceLoader$1.next(ServiceLoader.java:480) ~[na:1.8.0_172]
at java.lang.Iterable.forEach(Iterable.java:74) ~[na:1.8.0_172]
at org.apache.shardingsphere.elasticjob.infra.spi.ElasticJobServiceLoader.registerTypedService(ElasticJobServiceLoader.java:51) ~[elasticjob-infra-common-3.0.0-RC1.jar:3.0.0-RC1]
at org.apache.shardingsphere.elasticjob.infra.listener.ElasticJobListenerFactory.(ElasticJobListenerFactory.java:34) ~[elasticjob-infra-common-3.0.0-RC1.jar:3.0.0-RC1]
at org.apache.shardingsphere.elasticjob.lite.internal.schedule.JobScheduler.lambda$getElasticJobListeners$1(JobScheduler.java:109) ~[elasticjob-lite-core-3.0.0-RC1.jar:3.0.0-RC1]
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_172]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382) ~[na:1.8.0_172]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_172]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_172]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[na:1.8.0_172]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_172]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[na:1.8.0_172]
at org.apache.shardingsphere.elasticjob.lite.internal.schedule.JobScheduler.getElasticJobListeners(JobScheduler.java:110) ~[elasticjob-lite-core-3.0.0-RC1.jar:3.0.0-RC1]
at org.apache.shardingsphere.elasticjob.lite.internal.schedule.JobScheduler.(JobScheduler.java:81) ~[elasticjob-lite-core-3.0.0-RC1.jar:3.0.0-RC1]
at org.apache.shardingsphere.elasticjob.lite.api.bootstrap.impl.ScheduleJobBootstrap.(ScheduleJobBootstrap.java:36) ~[elasticjob-lite-core-3.0.0-RC1.jar:3.0.0-RC1]
at org.apache.shardingsphere.elasticjob.lite.spring.boot.job.ElasticJobBootstrapConfiguration.registerClassedJob(ElasticJobBootstrapConfiguration.java:101) ~[elasticjob-lite-spring-boot-starter-3.0.0-RC1.jar:3.0.0-RC1]
at org.apache.shardingsphere.elasticjob.lite.spring.boot.job.ElasticJobBootstrapConfiguration.constructJobBootstraps(ElasticJobBootstrapConfiguration.java:84) ~[elasticjob-lite-spring-boot-starter-3.0.0-RC1.jar:3.0.0-RC1]
at org.apache.shardingsphere.elasticjob.lite.spring.boot.job.ElasticJobBootstrapConfiguration.createJobBootstrapBeans(ElasticJobBootstrapConfiguration.java:57) ~[elasticjob-lite-spring-boot-starter-3.0.0-RC1.jar:3.0.0-RC1]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_172]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_172]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_172]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_172]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
... 18 common frames omitted
Caused by: java.lang.InstantiationException: elasticjob.listeners.MyDistributeOnceJobListener
at java.lang.Class.newInstance(Class.java:427) ~[na:1.8.0_172]
at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:380) ~[na:1.8.0_172]
... 44 common frames omitted
Caused by: java.lang.NoSuchMethodException: elasticjob.listeners.MyDistributeOnceJobListener.()
at java.lang.Class.getConstructor0(Class.java:3082) ~[na:1.8.0_172]
at java.lang.Class.newInstance(Class.java:412) ~[na:1.8.0_172]
... 45 common frames omitted

[TeslaCN]

SPI requires no args constructor to instantiate your listener.

[dolphin-bear]

got it,thanks!!