Install JAVA in Debian system

install java (http://www.java.com/en/download/index.jsp)

install java plugin to iceweasel(http://www.java.com/en/download/help/linux_install.xml#enable):

1. Create a symbolic link to the libjavaplugin.so file in the browser plugins directory
   • Go to the plugins sub-directory under the Firefox installation directory
     cd /plugins
     (such as /usr/lib/iceweasel/plugins/)
   
   
   • Create the symbolic link
     ln -s /plugin/i386/
ns7/libjavaplugin_oji.so
     
     In the ln command line above, use ns7-gcc29 if Firefox was compiled with gcc2.9.
   
   If you install Firefox 1.5 or later, you can enable the Java Console menu item in the Tools menu. Change directories to the Firefox extensions directory, then unzip ffjcext.zip there.

   cd /usr/lib/firefox-1.4/extensions
unzip /usr/java/jre1.6.0/lib/deploy/ffjcext.zip