如何获取`SkipListener`中的`JobId`？

Question

如何在SkipListener中获取JobId？我使用了以下逻辑，但它不起作用。

private Long jobId;

@BeforeStep
public void getJobId(StepExecution stepExecution) {
    this.jobId = stepExecution.getJobExecution().getJobId();
}

下面我也试过了

@Value("#{stepExecution.jobExecution.jobId}")
private Long jobId;

但得到以下

Caused by: org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'stepExecution' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public or not valid?
    at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:164) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.evaluateBeanDefinitionString(AbstractBeanFactory.java:1569) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1250) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1226) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    ... 85 common frames omitted
Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'stepExecution' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public or not valid?
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:217) ~[spring-expression-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104) ~[spring-expression-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:91) ~[spring-expression-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:55) ~[spring-expression-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:91) ~[spring-expression-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:112) ~[spring-expression-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:272) ~[spring-expression-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:161) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]
    ... 89 common frames omitted

Answer 1

第一种方法（实现 SkipListener 接口）应该与添加步骤范围一起使用。第二种方法（使用 SpEL 表达式注入 stepExecution）需要将侦听器声明为步骤作用域 bean。

Is this fine if we define reader bean with the StepScope and not the processor and writer beans? Please confirm

是的，没关系。并非所有步骤组件都需要 step-scoped 在一起。

如何获取`SkipListener`中的`JobId`？

How to get the `JobId` in the `SkipListener`?

spring

spring-batch