swt - java.lang.NullPointerException at org.eclipse.jface.resource.JFaceResources.getResources -


i going implement wizard swt / jface. when run program, have below error:

exception in thread "main" java.lang.nullpointerexception @ org.eclipse.jface.resource.jfaceresources.getresources(jfaceresources.java:209) @ org.eclipse.jface.resource.jfaceresources.getimageregistry(jfaceresources.java:402) @ org.eclipse.jface.wizard.wizard.<init>(wizard.java:105) @ mypackage.reservationwizard.<init>(reservationwizard.java:21) @ mypackage.reservationwizard.main(reservationwizard.java:69)

the part of code:

public class reservationwizard extends wizard {  **public reservationwizard() {**  //    setwindowtitle("hotel room reservation wizard");  //   setneedsprogressmonitor(true);  //  setdefaultpageimagedescriptor(imagedescriptor.createfromfile(null, "unknown.jpg")); } ...     public static void main(string[] args) {  **reservationwizard wizard = new reservationwizard();**  wizarddialog dialog = new wizarddialog(display.getdefault().getactiveshell(), wizard);   dialog.setblockonopen(true);     dialog.open();  }  }

as seen in code has error, when reservationwizard() empty. should do?

it has error on specified lines.

edit: when created display, have below error:

 @ java.net.urlclassloader.defineclass(urlclassloader.java:467)  @ java.net.urlclassloader.access$100(urlclassloader.java:73)  @ java.net.urlclassloader$1.run(urlclassloader.java:368)  @ java.net.urlclassloader$1.run(urlclassloader.java:362)  @ java.security.accesscontroller.doprivileged(native method)  @ java.net.urlclassloader.findclass(urlclassloader.java:361)  @ java.lang.classloader.loadclass(classloader.java:424)  @ sun.misc.launcher$appclassloader.loadclass(launcher.java:331)  @ java.lang.classloader.loadclass(classloader.java:357)  @ java.lang.classloader.defineclass1(native method)  @ java.lang.classloader.defineclass(classloader.java:763)  @ java.security.secureclassloader.defineclass(secureclassloader.java:142)  @ java.net.urlclassloader.defineclass(urlclassloader.java:467)  @ java.net.urlclassloader.access$100(urlclassloader.java:73)  @ java.net.urlclassloader$1.run(urlclassloader.java:368)  @ java.net.urlclassloader$1.run(urlclassloader.java:362)  @ java.security.accesscontroller.doprivileged(native method)  @ java.net.urlclassloader.findclass(urlclassloader.java:361)  @ java.lang.classloader.loadclass(classloader.java:424)  @ sun.misc.launcher$appclassloader.loadclass(launcher.java:331)  @ java.lang.classloader.loadclass(classloader.java:357)  @ org.eclipse.jface.resource.jfaceresources.getfontregistry(jfaceresources.java:340)  @ org.eclipse.jface.window.window.createshell(window.java:508)  @ org.eclipse.jface.window.window.create(window.java:429)  @ org.eclipse.jface.dialogs.dialog.create(dialog.java:1096)  @ org.eclipse.jface.window.window.open(window.java:792)  @ mypackage.reservationwizard.main(reservationwizard.java:76) caused by: java.lang.classnotfoundexception:    org.eclipse.core.commands.common.eventmanager  @ java.net.urlclassloader.findclass(urlclassloader.java:381)  @ java.lang.classloader.loadclass(classloader.java:424)  @ sun.misc.launcher$appclassloader.loadclass(launcher.java:331)  @ java.lang.classloader.loadclass(classloader.java:357)  ... 30 more

you have not created display before calling wizard. first thing swt / jface application has create display.

so need:

public static void main(final string [] args) {   // create display   display display = new display();    reservationwizard wizard = new reservationwizard();   wizarddialog dialog = new wizarddialog(display.getactiveshell(), wizard);    dialog.setblockonopen(true);   dialog.open(); }

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