/super-csv/src/main/java/org/supercsv/io/Tokenizer.java
if ( columns == null) {   throw new NullPointerException( "columns should not be null") ; }
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this.maxLinesPerRow = preferences.getMaxLinesPerRow(); this.emptyColumnParsing = preferences.getEmptyColumnParsing(); this.quoteEscapeChar = preferences.getQuoteEscapeChar(); } public boolean readColumns(final List<String> columns) throws IOException { if( columns == null ) { <extra_id_0> } columns.clear(); currentColumn.setLength(0); currentRow.setLength(0); String line; do {