PdfReportGenerator.java:20: cannot find symbol
symbol  : class FileInputStream
location: class PdfReportGenerator
        InputStream template = new FileInputStream(template_filename);
                                   ^
PdfReportGenerator.java:21: cannot find symbol
symbol  : class OuputStream
location: class PdfReportGenerator
        OuputStream report   = new FileOutputStream(report_filename);
        ^
PdfReportGenerator.java:21: cannot find symbol
symbol  : class FileOutputStream
location: class PdfReportGenerator
        OuputStream report   = new FileOutputStream(report_filename);
                                   ^
PdfReportGenerator.java:22: cannot find symbol
symbol  : class FileInputStream
location: class PdfReportGenerator
        InputStream xmlData  = new FileInputStream(xmlData_filename);