beanio | Java library for marshalling and unmarshalling bean objects

Debugging how Spring Batch inject the parameters I found the solution.

I just need to add @StepScope in the class and create the variable where I want to inject the parameter:

The problem is with the Reader implementation that you used to read the data from as indicated by the error message:

java.lang.IllegalArgumentException: Comments require reader.markSupported() to return true

You need to use a Reader that supports buffering, i.e. a Reader that implements the mark() and reset() methods. See section 4.1.2 of the documentation and the description and explanation for the comments property name, which states:

A comma separated list of values for identifying commented lines. If a line read from an input stream begins with any of the configured values, the line is ignored. A backslash may be used to escape a comma and itself. All whitespace is preserved.

Enabling comments require the input reader passed to StreamFactory to support marking. Among others, Java's BufferedReader and StringReader support marking.

For comments to work you need to read the data with either a BufferedReader or a StringReader

The following is working for me:

The location to BeanIO mapping file is configured in BeanIOItemReaderWriterBase class , so whatever configuration specified in the mapping file will be passed to the underlying BeanIO reader.

From the stack trace, it looks like it's complaining about the underlying reader does not support mark (reader.markSupported returns false). But JBeret BeanIOItemReader class uses a BufferedReader, which does support mark.