#vulnerable code 
                                @Override
    public String toSerializable(final LogEvent event) {
        final Message message = event.getMessage();
        final Object[] parameters = message.getParameters();
        final StringBuilder buffer = prepareStringBuilder(strBuilder);
        try {
            // Revisit when 1.3 is out so that we do not need to create a new
            // printer for each event.
            // No need to close the printer.
            final CSVPrinter printer = new CSVPrinter(buffer, getFormat());
            printer.printRecord(parameters);
            return buffer.toString();
        } catch (final IOException e) {
            StatusLogger.getLogger().error(message, e);
            return getFormat().getCommentMarker() + " " + e;
        }
    } 
                            #location 11 
                            #vulnerability type RESOURCE_LEAK
#fixed code
                                @Override
    public String toSerializable(final LogEvent event) {
        final Message message = event.getMessage();
        final Object[] parameters = message.getParameters();
        final StringBuilder buffer = getStringBuilder();
        // Revisit when 1.3 is out so that we do not need to create a new
        // printer for each event.
        // No need to close the printer.
        try (final CSVPrinter printer = new CSVPrinter(buffer, getFormat())) {
            printer.printRecord(parameters);
            return buffer.toString();
        } catch (final IOException e) {
            StatusLogger.getLogger().error(message, e);
            return getFormat().getCommentMarker() + " " + e;
        }
    }