我正在读取csv文件,并使用spring batch(读取,处理和写入)将数据插入数据库。我正在itemWriter类中使用“ jpaRepository.save”将数据保存到数据库中。我试图在@OnSkipInWrite方法中捕获跳过的项目和跳过的消息,但是即使数据被跳过也不会调用此方法。并在batch_step_execution表中: read_count = 18,write_count = 10,write_skip_count = 0,roll_back_count = 8。 为什么write_skip_count为0?我只想知道哪个项目被跳过了,什么是例外消息。我的步骤:
@Bean
public Step step() throws IOException {
return stepBuilderFactory.get("step").<Entity, Entity>chunk(1).reader(multiResourceItemReader())
.processor(processor()).writer(writer()).faultTolerant().skip(Exception.class).skipLimit(100)
.listener(new stepExecutionListener()).build();
}
这是我的侦听器类。
public class StepExecutionListener{
private static final Logger LOG = Logger.getLogger(StepExecutionListener.class);
@OnSkipInRead
public void onSkipInRead(Throwable t) {
LOG.error("On Skip in Read Error : " + t.getMessage());
}
@OnSkipInWrite
public void onSkipInWrite(Entity item, Throwable t) {
LOG.error("Skipped in write due to : " + t.getMessage());
}
@OnSkipInProcess
public void onSkipInProcess(Entity item, Throwable t) {
LOG.error("Skipped in process due to: " + t.getMessage());
}
@OnWriteError
public void onWriteError(Exception exception, List<? extends Entity> items) {
LOG.error("Error on write on " + items + " : " + exception.getMessage());
}}
为什么不调用@OnSkipInWrite和@OnWriteError?任何帮助将非常感激。预先感谢。
答案 0 :(得分:0)
我从您分享的内容中看不到为什么不调用跳过监听器,但这是使用监听器的一个独立示例:
import java.util.Arrays;
import java.util.List;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.annotation.OnSkipInProcess;
import org.springframework.batch.core.annotation.OnSkipInRead;
import org.springframework.batch.core.annotation.OnSkipInWrite;
import org.springframework.batch.core.annotation.OnWriteError;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.batch.item.ItemReader;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.support.ListItemReader;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
@EnableBatchProcessing
public class MyJob {
@Autowired
private JobBuilderFactory jobs;
@Autowired
private StepBuilderFactory steps;
@Bean
public ItemReader<Integer> itemReader() {
return new ListItemReader<>(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
}
@Bean
public ItemWriter<Integer> itemWriter() {
return items -> {
for (Integer item : items) {
if (item.equals(3)) {
throw new Exception("No 3 here!");
}
System.out.println("item = " + item);
}
};
}
@Bean
public Step step() {
return steps.get("step")
.<Integer, Integer>chunk(5)
.reader(itemReader())
.writer(itemWriter())
.faultTolerant()
.skip(Exception.class)
.skipLimit(10)
.listener(new StepExecutionListener())
.build();
}
@Bean
public Job job() {
return jobs.get("job")
.start(step())
.build();
}
public class StepExecutionListener {
@OnSkipInRead
public void onSkipInRead(Throwable t) {
System.err.println("On Skip in Read Error : " + t.getMessage());
}
@OnSkipInWrite
public void onSkipInWrite(Integer item, Throwable t) {
System.err.println("Skipped in write due to : " + t.getMessage());
}
@OnSkipInProcess
public void onSkipInProcess(Integer item, Throwable t) {
System.err.println("Skipped in process due to: " + t.getMessage());
}
@OnWriteError
public void onWriteError(Exception exception, List<? extends Integer> items) {
System.err.println("Error on write on " + items + " : " + exception.getMessage());
}}
public static void main(String[] args) throws Exception {
ApplicationContext context = new AnnotationConfigApplicationContext(MyJob.class);
JobLauncher jobLauncher = context.getBean(JobLauncher.class);
Job job = context.getBean(Job.class);
JobExecution jobExecution = jobLauncher.run(job, new JobParameters());
StepExecution stepExecution = jobExecution.getStepExecutions().iterator().next();
System.out.println("WriteSkipCount = " + stepExecution.getWriteSkipCount());
}
}
此示例打印:
item = 1
item = 2
Error on write on [1, 2, 3, 4, 5] : No 3 here!
item = 1
item = 2
Error on write on [3] : No 3 here!
item = 4
Skipped in write due to : No 3 here!
item = 5
item = 6
item = 7
item = 8
item = 9
item = 10
WriteSkipCount = 1
这意味着在写入时跳过某项并且writeSkipCount
是正确的时,将调用跳过侦听器。
希望这会有所帮助。
答案 1 :(得分:0)
您可以实现SkipListener接口,而不使用@OnWriteError注释。
答案 2 :(得分:0)
在您的 BatchConf 中尝试:
@Bean
@StepScope
public StepExecutionListener stepExecutionListener() {
return new StepExecutionListener();
}
...
.skipLimit(1)
.listener(stepExecutionListener()
.build();