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textbox setvalue java.lang.nullpointerexception

asked 2015-03-29 20:32:23 +0800

thinkingste gravatar image thinkingste
1

I was a newbie trying to learn ZK using ZK 7 Essential ebook. When i tried source codes on chapter 5 section Initialize Profile Form, I got a java.lang.nullpointerexception. It happen on this line at page 27: fullName.setValue(user.getFullName()); I have checked that user.getFullName() is not returning null value. These are the full exception: java.lang.NullPointerException org.zkoss.essentials.chapter5.mvc.ProfileViewController.refreshProfileView(ProfileViewController.java:61) org.zkoss.essentials.chapter5.mvc.ProfileViewController.doAfterCompose(ProfileViewController.java:51) org.zkoss.zk.ui.impl.UiEngineImpl.doAfterCompose(UiEngineImpl.java:578) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:880) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:826) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:735) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:699) org.zkoss.zk.ui.impl.UiEngineImpl.createComponents(UiEngineImpl.java:1080) org.zkoss.zk.ui.impl.AbstractExecution.createComponents0(AbstractExecution.java:251) org.zkoss.zk.ui.impl.AbstractExecution.createComponents(AbstractExecution.java:243) org.zkoss.zul.Include.afterCompose(Include.java:448) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:878) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:826) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:735) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:699) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:872) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:826) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:735) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:699) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:872) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:826) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:735) org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:797) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:757) org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:699) org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:442) org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:356) org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:217) org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:136) javax.servlet.http.HttpServlet.service(HttpServlet.java:617) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

Is this a bug or is there something that I should pay attention before setting the textbox value?

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answered 2015-03-30 01:38:52 +0800

echarish gravatar image echarish flag of Japan
1809 7
http://jp.linkedin.com/in...

Please check if your fullName object is being initialized properly, most probably it is null, check naming camel casing or if the id is being defined or not.

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answered 2015-03-30 05:43:10 +0800

Darksu gravatar image Darksu
1991 1 4

Hello thinkingste,

In order to understand the MVC design pattern please refer to the following url:

http://books.zkoss.org/wiki/ZKDeveloper%27sReference/MVC

And you can refer to the following example:

http://www.zkoss.org/zkdemo/getting_started/mvc

Best Regards,

Darksu

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Asked: 2015-03-29 20:32:23 +0800

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Last updated: Mar 30 '15

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