Insert values into a mysql database in java -

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Hi, I'm trying to insert data into your database, the following error is removed: 

 << code>  
> exception formula Validations.RegisterValidation "AWT- EventQueue-0 "java.lang.NullPointerException & Lt; Init & gt; ui.RegistrationUI to $ 2.mouseClicked on (RegisterValidation.java:26) (RegistrationUI.java:49) .AWTEventMulticaster.mouseClicked java.awt.Component.processMouseEvent (Component.java:6530) on java.awt (AWTEventMulticaster.java: 270) javax.swing.JComponent.processMouseEvent (JComponent.java:3321) on java.awt.Component.processEvent (Component.java:6292) java.awt.Container.processEvent (Container.java:2234) java.awt. Component.dispatchEventImpl (Component.java:4883) on java.awt.Container.dispatchEventImpl (Container.java:2292) on java.awt.LightweightDispatcher.retargetMouseEvent on Java.awt.Component.dispatchEvent (component.java:4705) (Kantenrkjawaa 4898) patcher.processMouseEvent on java.awt.Window.dispatchEventImpl on java.awt.LightweightDis (Container.java:4542) java.awt.LightweightDispatcher.dispatchEvent (Container.java:4462) java.awt.Container. On dispatchEventImpl (Container.java:2278) on (vs Dow Java: 2739) on java.awt.Component.dispatchEvent (Component.java:4705) java.awt.EventQueue.dispatchEventImpl on (EventQueue.java:746) java.awt.EventQueue.access $ 400 (less than EventQueue.java : 97) on java.security.AccessController.doPrivileged (Native method java.security java.awt.EventQueue $ 3.run (EventQueue.java:697) java.awt.EventQueue $ 3.run (EventQueue.java:691 ) but but. The java.awt on ProtectionDomain $ 1.doIntersectionPrivilege (ProtectionDomain.java:75) $ 1.doIntersectionPrivilege (ProtectionDomain.java:86) java.security.ProtectionDomain on java.awt.EventQueue $ 4.run (EventQueue.java:719) .EventQueue $ 4 Biseshadikarit (Basic Law on .run (EventQueue.java:717) java.security.PrivacyDomain $ 1.doI on Java.security.AccessController) java on JavakawtkEventDispatchThreadkpumpOneEventForFilters (Event DispatchThread.java). Jt.extext.eu.text.text.text (): java.awt.EventDispatchThread at java.awt.EventQueue.dispatchEvent (EventQueue.java:716) at ntsectionPrivilege (ProtectionDomain.java:75): Java.awt.EventDispatchThread.pumpEventsForHierarchy on awt.EventDispatchThread.pumpEventsForFilter (EventDispatchThread.java) On pumpEvents) on javascript (EventDispatchThread.java.101) on java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:93) on Java. .wt.EventDispatchThread.run (EventDispatchThread.java:82)

Thus: 

  public boolean addUser (string name, string name, string email , string password) SQLException throws {string query = "username (name, surname, email, password)" + "VALUES ( '+ name +' '+ + + + +' '+' '' + Email + "','" + + password + "')"; Statement.executeUpdate (query); Back true; }

All data being inserted is in string form and as far as I know my SQL is correct. Can anyone tell me what I'm doing wrong?


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