Reading line breaks in CSV which are quoted in the file in FlatfileItemReader of spring batch

out of the box the FlatFileItemReader uses a SimpleRecordSeparatorPolicy, for your usecase

• commented part goes over 2 or more lines

you need to set the DefaultRecordSeparatorPolicy

Cited from its javadoc:

A RecordSeparatorPolicy that treats all lines as record endings, as long as they do not have unterminated quotes, and do not end in a continuation marker.

example xml configuration

<bean id="reader" 
      class="org.springframework.batch.item.file.FlatFileItemReader">
      ...
    <property name="recordSeparatorPolicy">
        <bean class="org.springframework.batch.item.file.separator.DefaultRecordSeparatorPolicy" />
    </property>
      ...
</bean>