java - I get some wired error with JOptionPane it says IllegalArgumentException -


i tried gui myself , found example on youtube 1 using it. works on screen not on computer.

this code example

    sp_conversation.sethorizontalscrollbarpolicy(scrollpaneconstants.horizontal_scrollbar_never);     sp_conversation.setverticalscrollbarpolicy(scrollpaneconstants.vertical_scrollbar_always);     sp_conversation.setviewportview(ta_conversation);     mainwindow.getcontentpane().add(sp_conversation);     sp_conversation.setbounds(10, 90, 330, 180);

it says this

exception in thread "main" java.lang.illegalargumentexception: invalid horizontalscrollbarpolicy @ javax.swing.jscrollpane.sethorizontalscrollbarpolicy(unknown source)

and kinda new this, dont know

can change constants jscrollpane below , see if works. 

sp_conversation.sethorizontalscrollbarpolicy(jscrollpane.horizontal_scrollbar_always); sp_conversation.setverticalscrollbarpolicy(jscrollpane.vertical_scrollbar_always);

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