Dependency commons-lang is not managed properly

Currently the commons-lang dependency used by projects is managed via an explicit dependency in the dependencyManagement section of the root pom.xml generated by the Essentials archetype. This gives the (false) impressions that the commons-lang version can be easily changed in projects. Our stack requires a minimal version of commons-lang to behave correctly. In FCS that was commons-lang 2.5, because the InlineSvg class in the CMS used ArrayUtils#isNotEmpty. In GA that class has been refactored so commons-lang 2.4 is also good enough as a minimal dependency. But, for example, changing the commons-lang dependency to 2.1 will make the repository throw an exception while starting up.

The commons-lang version in the generated root pom.xml of projects also makes it harder to bump the commons-lang dependency in our stack, if needed in the future: projects will have to change the version in their generated root pom.xml too when upgrading.

The version should be managed in another way, e.g. via the project pom and/or dependency management in cms-api, cms-dependencies, repository-dependencies, and/or maybe Essentials .

Steps to reproduce:
1. check out the tagging demo: https://svn.onehippo.org/repos/hippo/hippo-cms7/plugins/content-tagging/demo/trunk
2. change the parent dependency in the root pom.xml file to 10.0.1 (so it uses the Hippo 10 FCS release)
3. build and start the project
4. login to the CMS

Expected: the CMS dashboard shows
Actual: a white screen saying "Server error" is shown and the following stacktrace is thrown. Reason: the demo pulls in commons-lang 2.4 instead of commons-lang 2.5. This demo does not specify an explicit version of commons-lang, so it reveals that our stack does not manage that dependency properly by itself.

[INFO] [talledLocalContainer] SEVERE: Servlet.service() for servlet [default] in context with path [/cms] threw exception [Filter execution threw an exception] with root cause
[INFO] [talledLocalContainer] java.lang.NoSuchMethodError: org.apache.commons.lang.ArrayUtils.isNotEmpty([Ljava/lang/Object;)Z
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.standards.image.InlineSvg.onComponentTag(InlineSvg.java:55)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2507)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.WebComponent.onRender(WebComponent.java:56)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.FragmentMarkupSourcingStrategy.onComponentTagBody(FragmentMarkupSourcingStrategy.java:86)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2536)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAssociatedMarkup(MarkupContainer.java:689)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.AssociatedMarkupSourcingStrategy.renderAssociatedMarkup(AssociatedMarkupSourcingStrategy.java:76)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.PanelMarkupSourcingStrategy.onComponentTagBody(PanelMarkupSourcingStrategy.java:112)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2536)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.link.AbstractLink.onComponentTagBody(AbstractLink.java:186)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2536)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2536)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2536)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.list.Loop.renderItem(Loop.java:167)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.list.Loop.renderChild(Loop.java:156)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.repeater.AbstractRepeater.onRender(AbstractRepeater.java:101)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2536)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2536)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAssociatedMarkup(MarkupContainer.java:689)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.AssociatedMarkupSourcingStrategy.renderAssociatedMarkup(AssociatedMarkupSourcingStrategy.java:76)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.PanelMarkupSourcingStrategy.onComponentTagBody(PanelMarkupSourcingStrategy.java:112)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRenderComponent(Component.java:2536)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
[INFO] [talledLocalContainer] at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
[INFO] [talledLocalContainer] at org.apache.wicket.Page.onRender(Page.java:887)
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.WebPage.onRender(WebPage.java:142)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.internalRender(Component.java:2366)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.render(Component.java:2294)
[INFO] [talledLocalContainer] at org.apache.wicket.Page.renderPage(Page.java:1024)
[INFO] [talledLocalContainer] at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:139)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.Main$7$1.renderPage(Main.java:453)
[INFO] [talledLocalContainer] at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:284)
[INFO] [talledLocalContainer] at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
[INFO] [talledLocalContainer] at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:890)
[INFO] [talledLocalContainer] at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
[INFO] [talledLocalContainer] at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261)
[INFO] [talledLocalContainer] at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
[INFO] [talledLocalContainer] at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
[INFO] [talledLocalContainer] at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259)
[INFO] [talledLocalContainer] at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)
[INFO] [talledLocalContainer] at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
[INFO] [talledLocalContainer] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
[INFO] [talledLocalContainer] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
[INFO] [talledLocalContainer] at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
[INFO] [talledLocalContainer] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
[INFO] [talledLocalContainer] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
[INFO] [talledLocalContainer] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
[INFO] [talledLocalContainer] at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
[INFO] [talledLocalContainer] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517)
[INFO] [talledLocalContainer] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1474)
[INFO] [talledLocalContainer] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[INFO] [talledLocalContainer] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[INFO] [talledLocalContainer] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
[INFO] [talledLocalContainer] at java.lang.Thread.run(Thread.java:745)