Conversion from String to Bigdecimal is giving error and method not saved

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I’m making a system for video rental and on my category screen a field called value to save the value of my category. I was able to convert String to Bigdecimal using the following methods: Tostring, Decimalformat, Stringbiginteger, valueof, Bigdecimal and Toplainstring but most of the error does not save the value of my category!

Code: 

private void btnSalvarActionPerformed(java.awt.event.ActionEvent evt) {                                            

        BigDecimal valor = new BigDecimal(0);  

        if (!cmpValor.getText().equals("")) {  
            valor = new BigDecimal(cmpValor.getText());  
        }  

        categoriaController.salvar(cmpDescricao.getText(), valor);  

}

Note: My category screen has three Jlabel: Code, description and value and three Jtextfield which are respectively cmpCodigo, cmpDescription and cmpValor! 

[code]Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException 
at view.VideoCategoria.btnSalvarActionPerformed(VideoCategoria.java:205) 
at view.VideoCategoria.access$000(VideoCategoria.java:19) 
at view.VideoCategoria$1.actionPerformed(VideoCategoria.java:62) 
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) 
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346) 
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) 
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) 
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) 
at java.awt.Component.processMouseEvent(Component.java:6527) 
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) 
at java.awt.Component.processEvent(Component.java:6292) 
at java.awt.Container.processEvent(Container.java:2234) 
at java.awt.Component.dispatchEventImpl(Component.java:4883) 
at java.awt.Container.dispatchEventImpl(Container.java:2292) 
at java.awt.Component.dispatchEvent(Component.java:4705) 
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:489 
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533) 
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462) 
at java.awt.Container.dispatchEventImpl(Container.java:227 
at java.awt.Window.dispatchEventImpl(Window.java:2739) 
at java.awt.Component.dispatchEvent(Component.java:4705) 
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746) 
at java.awt.EventQueue.access$400(EventQueue.java:97) 
at java.awt.EventQueue$3.run(EventQueue.java:697) 
at java.awt.EventQueue$3.run(EventQueue.java:691) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) 
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86) 
at java.awt.EventQueue$4.run(EventQueue.java:719) 
at java.awt.EventQueue$4.run(EventQueue.java:717) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) 
at java.awt.EventQueue.dispatchEvent(EventQueue.java:716) 
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) 
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) 
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) 
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) 
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) 
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)[/co
java mysql string swing mvc

  • What is line 205 of the Videocategoria class?

  • This: ' categorieController.save(cmpDescription.gettext(), value); ' :)

  • 1

    You have a Nullpointerexception problem on that line, probably cmpDescription is null at that point, test it before you catch the getText(). Besides, you’re having some other difficulty?

  • How to test it?! I’m still new to programming!

  • I think that’s how it’s done: if(cmpDescricao !=null ) categoriaController.salvar(cmpDescricao.getText(), valor); But you have to see his pq is getting null there, may have to review your logic

  • I tested but keeps error on the same line : categorieController.save(cmpDescription.gettext(), value);

  • So what’s null must be the categoriaController, check if it has been initialized.

  • I had already initialized it : private CategoriaController categoriaController;

  • This is declaring, not initializing. You must have to assign a value to it from an object. If you are not using a framework this is usually done using the new.

  • 2

    It worked here and thanks for the help! Now gave error in Categoriadao I’ll try to solve here! Thanks!

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