i need help.
Generally you don't convert it, thus why would you need o do so ?
You either explain those special needs into a form that would let us understand if an alternative solution can be provided, or you don't, in which case the answer remains: no, you cannot "convert" a JAR into a SIS in any useful manner, just as you cannot convert chocolate ice-cream into a chocolate cake.
You should take some time to understand what a SIS file is, what a JAR file is and then ask again if you think that there should be possible to solve your problem.
then you could try making a Symbian application that installs the java application. Then the Symbian app would get installed, and you would have the java installation files as content, and when user clicks the icon for the Symbian application it would go and install the java application.
if you would Symbian sign the sis you could always try auto starting the Symbian app, but then you would need to wait until the installer exits, before you could attempt to start any additional installations.
i searched some materials , and found it can be.
in the url "http://discussion.forum.nokia.com/forum/showthread.php?96384-Convert-Jar-and-Jad-files-to-SIS#post264038"
the document ''http://www3.symbian.com/faq.nsf/0/2E2F00D52D2BF0D480256FAF003F920C?OpenDocument' can't be opened
i think it's important for solving it.
symbian.com is long gone, I would suppose that what ever was there would nto be too much on real help, most likely it would be something I suggested, as well as it appears to be pre-3rd edition stuff.
so have you considered the suggestion on #7 ?
The old FAQ from Symbian.com is of course still available in the Internet Archive Wayback Machine: http://classic-web.archive.org/web/2...C?OpenDocument
I have a strong suspicion that the solution will not work on current devices so you should really go for Yukka's suggestion, which is in fact implemented already as a wiki example (you do the search).