SpringBatch跳过异常和限制方式

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我是靠谱客的博主外向曲奇，这篇文章主要介绍SpringBatch跳过异常和限制方式，现在分享给大家，希望可以做个参考。

SpringBatch容错处理

1. 案例说明

从DB中reader出1000条数据，chunk = 100，当第二个chunk出现NullPointerException或者StringIndexOutOfBoundsException异常。业务要求batch不终了，程序继续执行。

2. 跳过异常限制

下记有两种实现方法。

2.1 skip 和 skipLimit配置

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@Bean
  public Step job1step1() throws Throwable {
    return stepBuilderFactory
        .get(_JOB_STEP_NAME)
          .listener(_stepListener)
          .<Model1, Model2>chunk(_CHUNK_SIZE)
          .reader(reader())
          .processor(processor())
          .writer(writer())
          .faultTolerant()
          .skipLimit(10)
          .skip(NullPointerException.class)
          .skip(StringIndexOutOfBoundsException.class)
          .build();
  }

上记代码示例中的skipLimit方法限制最大跳过数，skip方法限制跳过的异常类型。

这样某条数据出现异常时，并不会终了step，而是跳过本条错误数据，继续处理下一条。

2.2 自定义跳过配置SkipPolicy 接口

SkipPolicy相对于skip更加灵活。

例：业务要求，userId = 110的用户出现上记两个异常时，程序终了。

step代码

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@Bean
  public Step job1step1() throws Throwable {
    return stepBuilderFactory
        .get(_JOB_STEP_NAME)
          .listener(_stepListener)
          .<Model1, Model2>chunk(_CHUNK_SIZE)
          .reader(reader())
          .processor(processor())
          .writer(writer())
          .faultTolerant()
          .skipPolicy(new SkipPolicyTask())
          .build();
  }

自定义SkipPolicy 接口代码

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public class SkipPolicyTask implements SkipPolicy {
    private static final int MAX_SKIP_COUNT = 10;
    private static final int USER_ID= 110;
 
    @Override
    public boolean isSkipFlg(Throwable throwable, int skipCount) 
      throws SkipLimitExceededException {
 
        if (throwable instanceof NullPointerException && skipCount < MAX_SKIP_COUNT) {
            return true;
        }
 
        if (throwable instanceof StringIndexOutOfBoundsException && skipCount < MAX_SKIP_COUNT ) {
            if(common.getUserId == INVALID_TX_AMOUNT_LIMIT) {
                return false;
            } else {
                return true;
            }
        }
        return false;
    }
 }

return flase 程序终了，retuen true 跳过异常。

SpringBatch 错误积累

1.如果nextStep在该JOB中还没有配置

也就是说nextStep还不存在的情况下，就会报错

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<end on="EIXT WITH IMBALANCE" />
　　<next on="BALANCED" to="nextStep" />
<fail on="*" />

Caused by: java.lang.IllegalArgumentException: Missing state for [StateTransition: [state=bain_Job.bainToTableStep, pattern=BALANCED, next=bain_Job.trustAcctBatPayStep]]
at org.springframework.batch.core.job.flow.support.SimpleFlow.initializeTransitions(SimpleFlow.java:283) ~[spring-batch-core-3.0.0.RELEASE.jar:3.0.0.RELEASE]
at org.springframework.batch.core.job.flow.support.SimpleFlow.afterPropertiesSet(SimpleFlow.java:128) ~[spring-batch-core-3.0.0.RELEASE.jar:3.0.0.RELEASE]
at org.springframework.batch.core.configuration.xml.SimpleFlowFactoryBean.getObject(SimpleFlowFactoryBean.java:125) ~[spring-batch-core-3.0.0.RELEASE.jar:3.0.0.RELEASE]
at org.springframework.batch.core.configuration.xml.SimpleFlowFactoryBean.getObject(SimpleFlowFactoryBean.java:46) ~[spring-batch-core-3.0.0.RELEASE.jar:3.0.0.RELEASE]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ~[spring-beans-4.1.5.RELEASE.jar:4.1.5.RELEASE]
... 42 common frames omitted

以上为个人经验，希望能给大家一个参考，也希望大家多多支持靠谱客。