@Bean
public ItemReader<TxIssuerUtil> readerIssuer() {

    FlatFileItemReader<TxIssuerUtil> reader = new FlatFileItemReader<>();
    reader.setResource(new FileSystemResource("Text.txt"));
    //reader.setLinesToSkip(0);
    reader.setMaxItemCount(1000000);
    reader.setLineMapper(productLineMapperIssuer());
    return  reader;
}

    @Bean
public LineMapper<TxIssuerUtil> productLineMapperIssuer(){
    DefaultLineMapper<TxIssuerUtil> mapper = new DefaultLineMapper<TxIssuerUtil>();
    mapper.setLineTokenizer(productLineTokenizer());
    mapper.setFieldSetMapper((fieldSet) -> validateItemReaderIssuer(fieldSet));
    return mapper;

}

public LineTokenizer productLineTokenizer() {
    FixedLengthTokenizer tokenizer = new FixedLengthTokenizer();
    tokenizer.setColumns(new Range[] {new Range(1,10),new Range(11,11),new Range(12,19),new Range(20,38),new Range(39,41),
                         new Range(42,60),new Range(61,63 ),new Range(64,65),new Range(66,76),new Range(77,77),new Range(78,84),
                         new Range(85,87),new Range(88,90),new Range(91,98), new Range(99,101), new Range(102,102 )});
    tokenizer.setNames(new String[] {"filler1","activeInactiveCode","accountRangeLow","gcmsProductId","filler4","accountRangeHigh","filler5",
            "cardProgramIdentifier","filler6","memberId","productTypeId","endPoint","countryCodeAlpha","countryCodeNumeric",
            "filelr11","licensedProductId","filler12"});
    return tokenizer;

Linea1:texto
linea2:texto de prueba
linea3:otro texto de prueba
linea4:texto nuevamente

Line is shorter than max range 102