java - JTwain doesnt work in jsp using servlet -

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i have downloaded jtwain api , created/tested java class connect scanner, open scanner ui , scan image java without problems.

i tried create jsp in tomcat form action connects servlet dopost method, calls jtwain method.

the problem im getting instead of getting kodak scanner window asking me press scan webpage freezes. put system.outs check freezes , stops @ 2 if kodak scanner dialog displaying , waiting me press scan button. 

public static image initscan(){     try {          source source = sourcemanager.instance().getdefaultsource();          system.out.println(1);          source.open();          system.out.println(2);          image image = source.acquireimage();          system.out.println(3);          return image;     }catch(exception e) {          e.printstacktrace();          return null;     }finally{          sourcemanager.closesourcemanager();     } }

i assumed work file open dialogue not, suggestions?

i don't know jtwain, jsp executed on server, not client. , suppose tomcat has no access gui interface, explain can't open window. (or opens window on server, can't see it.)

do see in server logfile?


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