web console not working with jdk 1.7

[adelcourt]

hi ,
i'm migrating from version 1.4 to 1.5.1 and the web console cannot loading with jdk 1.7

java.lang.NoClassDefFoundError: java/util/Base64
at org.ff4j.web.console.ImageProvider.fromFileToBase64(ImageProvider.java:95)
at org.ff4j.web.console.ImageProvider.getImage(ImageProvider.java:119)
at org.ff4j.web.console.ImageProvider.addImageToContext(ImageProvider.java:138)

we are actualy stuck with jdk 1.7 (Weblogic ...) it's possible to use a more compliant base 64 encoder whith older environement ?
some possibility : http://stackoverflow.com/questions/14413169/which-java-library-provides-base64-encoding-decoding

[clun]

We should be compliant with JDK1.6. I reinstall a JDK1.6 and change the IMageProvider to be compliant.