Spring package using java annotations java.lang.IllegalStateException: cannot create properties without metadata

Question

• Attempts to automate FieldSets for domain objects using java anotations only in the project

• Failed to complete the following:

  BeanWrapperFieldSetMapper.mapFieldSet (line 184) in the following line (line 187):

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

  Note. I did not specify names as I try to use Automap.

• Below is my code:

  @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;
      }
  

• Exact stack trace

  Exit-Descr .: org.springframework.batch.item.file.FlatFileParseException: Parsing error at line: 1 in resource=[class path resource [partner-import.csv]], input=[Mustermann,Max,[e-mail],m]

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

Answer 1

You miss likeTokenizer.setNames () because you work with names (the names of your properties Partner)