spring-batch - Spring批处理使用java注释java.lang.IllegalStateException : Cannot create properties without meta data

Question

1. 尝试仅在项目中使用 java 注释将 FieldSets 自动映射到域对象

2. 以下情况失败:

   BeanWrapperFieldSetMapper.mapFieldSet (第 184 行)在下一行(第 187 行):

   binder.bind(new MutablePropertyValues(getBeanProperties(copy, fs.getProperties())));
   @Override
   public Properties getProperties() {
       if (names == null) {
           throw new IllegalStateException("Cannot create properties without meta data");
       }
   

   注意:我没有指定名称，因为我正在尝试自动映射。

3. 以下是我的代码:

   @Bean
       public LineMapper<Partner> lineMapper() {
           DefaultLineMapper<Partner> lineMapper = new DefaultLineMapper<Partner>();
           DelimitedLineTokenizer lineTokenizer = new DelimitedLineTokenizer();
           BeanWrapperFieldSetMapper<Partner> fieldSetMapper = new BeanWrapperFieldSetMapper<Partner>(); 
           fieldSetMapper.setBeanFactory(getApplicationContext()); 
           fieldSetMapper.setTargetType(Partner.class);
           lineMapper.setLineTokenizer(lineTokenizer);
           lineMapper.setFieldSetMapper(fieldSetMapper);
           return lineMapper;
       }
   

4. 精确的堆栈跟踪

   退出描述。 :org.springframework.batch.item.file.FlatFileParseException: Parsing error at line: 1 in resource=[class path resource [partner-import.csv]], input=[Mustermann,Max,dahiya.naveen@gmail.com,m]

   原因:java.lang.IllegalStateException: Cannot create properties without meta data
at org.springframework.batch.item.file.transform.DefaultFieldSet.getProperties(DefaultFieldSet.java:745)

Answer 1

您缺少设置 likeTokenizer.setNames()因为您正在使用名称(您的 Partner 属性的名称)