Why does exception appears

hello people!
i ve got a problem,
my task is to make a program that can be used in the libraries!
the main task is that i make a programm which will be an object-oriented database.
i have already made this (the object - oriented database program) and all i need is to make a UI for my programm which must show how does my database works for example in the library. (like a library program)
i have tested my database programm and it works!
it saves database and loads it, and it adds and deletes objects from it and it can make search, but when i tryed to add an UI to my program, exception appeared:
when i call
database datbs = new database();
Object[] result = datbs.search(Book.class, srch); // here exception occurs
// srch is an object which is used by database.search to filter the objects in the database
the exception is:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
     at findbook.FindBook.search(FindBook.java:267)
     at findbook.FindBook.search(FindBook.java:259)
     at findbook.FindBook.actionPerformed(FindBook.java:182)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
     at java.awt.Component.processMouseEvent(Component.java:6041)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
     at java.awt.Component.processEvent(Component.java:5806)
     at java.awt.Container.processEvent(Container.java:2058)
     at java.awt.Component.dispatchEventImpl(Component.java:4413)
     at java.awt.Container.dispatchEventImpl(Container.java:2116)
     at java.awt.Component.dispatchEvent(Component.java:4243)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
     at java.awt.Container.dispatchEventImpl(Container.java:2102)
     at java.awt.Window.dispatchEventImpl(Window.java:2440)
     at java.awt.Component.dispatchEvent(Component.java:4243)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
but in the test program the same call works without exceptions, (in the test program UI is not used)

are you sure that the database object is created before you call the method?

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Date: Thu, 11 Oct 2012 16:39:47 -0600
From: [email protected]
To: [email protected]
Subject: Why does border appear around embedded video?
    Re: Why does border appear around embedded video?
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Why does exception appears

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