Spring batch using java annotations java.lang.IllegalStateException: Cannot create properties without meta data

1. Trying to Automapping FieldSets to Domain Objects using java anotations only in project

2. Failing at the following :

   BeanWrapperFieldSetMapper.mapFieldSet (line 184) at 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 am trying to Automap.

3. Following 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;
       }
   

4. 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,dahiya.naveen@gmail.com,m]

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

You are missing to set likeTokenizer.setNames() because you are working with names (the names of your Partner properties)