O quer dizer esses erros (Java + JDBC)?

Assuntos Gerais
#1

Estou tentando inserir contatos, mas qnd clico para inserir, aparece esses seguintes erros:


Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at DataBase.inserir(DataBase.java:50)
	at Cadastro$1.actionPerformed(Cadastro.java:88)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

at DataBase.inserir(DataBase.java:50) : aqui estou fazendo isso
statement.executeUpdate(sqlInsert);

at Cadastro$1.actionPerformed(Cadastro.java:88) : estou fazendo isso
inserirBanco.inserir(nomeTxt.getText(), Integer.parseInt(idadeTxt.getText()), enderecoTxt.getText());

O que pode ser os erros ???

Muito obrigado!

#2

Verifica se Database ou statement estão nulos.
até+

#3