Código para que funcione con jdk 1.8

Deseo preguntarles por favor como hago para que un código funcione teniendo jdk 1.8, pues al compilarlo me muestra los siguientes errores el código de la aplicación esta en https://joseluisbz.wordpress.com/2011/07/16/subiendo-imagenes-png-y-jpg-y-archivos-a-mysql-con-php-y-jsp-y-mostrarlos-en-rtf-usando-clases siempre es largo por eso no lo incluyo pero si incluyo los errores: Gracias anticipadas por la ayuda que me puedan brindar

org. Apache. Jasper.JasperException: PWC6033: Error in Javac compilation for JSP
PWC6199: Generated servlet error:
Source value 1.5 is obsolete and will be removed in a future release
PWC6199: Generated servlet error:
Target value 1.5 is obsolete and will be removed in a future release
PWC6199: Generated servlet error:
To suppress warnings about obsolete options, use -Xlint:-options.
PWC6197: An error occurred at line: 6 in the jsp file: /RTF.jsp
PWC6199: Generated servlet error:
class org.apache.jsp.Personal_jsp.RTFFile is already defined in class org.apache.jsp.Personal_jsp
PWC6197: An error occurred at line: 6 in the jsp file: /RTF.jsp
PWC6199: Generated servlet error:
class org.apache.jsp.Personal_jsp.RTFTable is already defined in class org.apache.jsp.Personal_jsp
PWC6197: An error occurred at line: 6 in the jsp file: /RTF.jsp
PWC6199: Generated servlet error:
class org.apache.jsp.Personal_jsp.RTFImage is already defined in class org.apache.jsp.Personal_jsp
PWC6199: Generated servlet error:
/Personal_jsp.java uses unchecked or unsafe operations.
PWC6199: Generated servlet error:
Recompile with -Xlint:unchecked for details.