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Could not initialize class de.agilecoders.wicket.webjars.util.WebjarsVersion$Holder
java.lang.NoClassDefFoundError: Could not initialize class de.agilecoders.wicket.webjars.util.WebjarsVersion$Holder at de.agilecoders.wicket.webjars.util.WebjarsVersion.useRecent(WebjarsVersion.java:46) at de.agilecoders.wicket.webjars.request.resource.WebjarsCssResourceReference.<init>(WebjarsCssResourceReference.java:27) at mycompany.MyBasePage.renderHead(MyBasePage.java:140) at org.apache.wicket.Component.renderHead(Component.java:4489) at org.apache.wicket.Component.internalRenderHead(Component.java:2715) at org.apache.wicket.markup.renderStrategy.AbstractHeaderRenderStrategy.renderRootComponent(AbstractHeaderRenderStrategy.java:119) at org.apache.wicket.markup.renderStrategy.ChildFirstHeaderRenderStrategy.renderHeader(ChildFirstHeaderRenderStrategy.java:60) at org.apache.wicket.markup.html.internal.HtmlHeaderContainer.onComponentTagBody(HtmlHeaderContainer.java:171) at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:70) at org.apache.wicket.Component.internalRenderComponent(Component.java:2565) at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1698) at org.apache.wicket.Component.internalRender(Component.java:2380) at org.apache.wicket.Component.render(Component.java:2308) at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1524) at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1759) at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1734) at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1657) at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:70) at org.apache.wicket.Component.internalRenderComponent(Component.java:2565) at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1698) at org.apache.wicket.Component.internalRender(Component.java:2380) at org.apache.wicket.Component.render(Component.java:2308) at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1524) at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1759) at org.apache.wicket.Page.onRender(Page.java:879) at org.apache.wicket.markup.html.WebPage.onRender(WebPage.java:141) at org.apache.wicket.Component.internalRender(Component.java:2380) at org.apache.wicket.Component.render(Component.java:2308) at org.apache.wicket.Page.renderPage(Page.java:1018) at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:124) at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:236) at org.apache.wicket.util.tester.BaseWicketTester$LastPageRecordingPageRendererProvider$1.respond(BaseWicketTester.java:2747) at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175) at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:895) at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64) at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265) at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222) at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293) at org.apache.wicket.util.tester.BaseWicketTester.processRequest(BaseWicketTester.java:718) at org.apache.wicket.util.tester.BaseWicketTester.processRequest(BaseWicketTester.java:657) at org.apache.wicket.util.tester.BaseWicketTester.startPage(BaseWicketTester.java:887) at org.apache.wicket.util.tester.BaseWicketTester.startPage(BaseWicketTester.java:904) at mycompany.MyTest.testWithWebjarsInvolved(MyTest.java:95)