なぜAttributeAppenderにエラーが発生しますか？コンストラクタを使用してページをインスタンス化できませんか？

Question

クラスMylistPage3 thatsはうまく動作します。

public class MyListPage3 extends WebPage { 

    private static final long serialVersionUID = 1L; 
    Model<String> infostringMdl = Model.of("Info: -"); 
    Model<String> classModelOfMsg = Model.of("btn btn-success btn-lg btn-block"); 
    Label infolabel = new Label("info", infostringMdl); 

    public MyListPage3(final PageParameters parameters) { 
     infolabel.setOutputMarkupId(true); 
     infostringMdl.setObject("Hello World"); 
     classModelOfMsg.setObject("btn btn-success btn-lg btn-block"); 
     //infolabel.add(new AttributeAppender("class", classModelOfMsg, " ")); 
     add(infolabel); 
    } 
} 

HTML：

... 
<table> 
    <tr> 
     <td width:="50%"><span wicket:id="info" 
      class="btn btn-default btn-lg btn-block">info here</span></td> 
    </tr> 
</table> 
... 

私は、Javaとスパンのクラスを設定したいのですが、ラインで...

infolabel.add(new AttributeAppender("class", classModelOfMsg, " ")); 

...私はエラーを取得します：

WicketMessage: Can't instantiate page using constructor public Pages.MyListPage3(org.apache.wicket.PageParameters) and argument 

Root cause: 

java.lang.ClassNotFoundException: org.apache.wicket.behavior.Behavior 
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
... 
... 

私はmvn依存関係を実行します。ツリー 結果は

[INFO] ------------------------------------------------------------------------ 
[INFO] Building WicketExamples 1.0-SNAPSHOT 
[INFO] ------------------------------------------------------------------------ 
[INFO] 
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ WicketExamples --- 
[INFO] com.mkyong.core:WicketExamples:war:1.0-SNAPSHOT 
[INFO] +- org.apache.wicket:wicket-core:jar:6.21.0:compile 
[INFO] | +- org.apache.wicket:wicket-util:jar:6.21.0:compile 
[INFO] | \- org.apache.wicket:wicket-request:jar:6.21.0:compile 
[INFO] +- org.codehaus.jackson:jackson-mapper-asl:jar:1.8.5:compile 
[INFO] | \- org.codehaus.jackson:jackson-core-asl:jar:1.8.5:compile 
[INFO] +- org.apache.wicket:wicket:jar:1.4.17:compile 
[INFO] +- de.agilecoders.wicket:wicket-bootstrap-core:jar:0.8.3:compile 
[INFO] | +- de.agilecoders.wicket.webjars:wicket-webjars:jar:0.2.0:compile 
[INFO] | | \- org.webjars:webjars-locator:jar:0.1:compile 
[INFO] | |  +- org.reflections:reflections:jar:0.9.8:compile 
[INFO] | |  | +- javassist:javassist:jar:3.12.1.GA:compile 
[INFO] | |  | \- dom4j:dom4j:jar:1.6.1:compile 
[INFO] | |  |  \- xml-apis:xml-apis:jar:1.0.b2:compile 
[INFO] | |  \- commons-lang:commons-lang:jar:2.6:compile 
[INFO] | +- org.webjars:bootstrap:jar:2.3.1-1:compile 
[INFO] | | \- org.webjars:jquery:jar:1.9.0:compile 
[INFO] | +- org.webjars:modernizr:jar:2.6.2-1:compile 
[INFO] | +- joda-time:joda-time:jar:2.0:compile 
[INFO] | +- com.google.guava:guava:jar:14.0.1:compile 
[INFO] | \- org.apache.wicket:wicket-extensions:jar:6.21.0:compile 
[INFO] +- de.agilecoders.wicket:wicket-bootstrap-extensions:jar:0.8.3:compile 
[INFO] | +- com.google.javascript:closure-compiler:jar:v20130411:compile 
[INFO] | | +- args4j:args4j:jar:2.0.16:compile 
[INFO] | | +- com.google.protobuf:protobuf-java:jar:2.4.1:compile 
[INFO] | | +- org.json:json:jar:20090211:compile 
[INFO] | | \- com.google.code.findbugs:jsr305:jar:1.3.9:compile 
[INFO] | \- org.webjars:jquerypp:jar:1.0b2:compile 
[INFO] +- de.agilecoders.wicket:wicket-bootstrap-themes:jar:0.8.3:compile 
[INFO] +- org.slf4j:slf4j-log4j12:jar:1.5.6:compile 
[INFO] | \- log4j:log4j:jar:1.2.16:compile 
[INFO] +- junit:junit:jar:4.10:test 
[INFO] | \- org.hamcrest:hamcrest-core:jar:1.3:test 
[INFO] +- org.mockito:mockito-all:jar:1.8.5:test 
[INFO] +- javax.servlet:servlet-api:jar:2.5:provided 
[INFO] +- org.slf4j:slf4j-api:jar:1.6.4:compile 
[INFO] \- org.slf4j:jcl-over-slf4j:jar:1.6.4:test 
[INFO] ------------------------------------------------------------------------ 
[INFO] BUILD SUCCESS 
[INFO] ------------------------------------------------------------------------ 
[INFO] Total time: 1.473 s 
[INFO] Finished at: 2016-04-12T20:10:30+02:00 
[INFO] Final Memory: 18M/226M 
[INFO] ------------------------------------------------------------------------ 

ここでは何が問題になりますか？

org.apache.wicket：wicket：jar：1.4.17ここではエラーの原因は？

Answer 1

アプリケーションのクラスパスを確認してください。そこにWicketのいくつかのバージョンがあるように見えます。