showcase ace:colorEntry > Swatches demo, myfaces specific issue.
In the "Create Swatch Dynamically" tab, after pressing the Create Swatch button a page/server error is seen and demo is not useable:
org.apache.myfaces.view.facelets.el.ContextAwarePropertyNotWritableException: javax.el.PropertyNotWritableException
javax.faces.component.UpdateModelException

Server error seen:
07-Jul-2017 14:49:36.979 WARNING [http-apr-8080-exec-6] org.icefaces.impl.applic
ation.ExtendedExceptionHandler.handle queued exception
 javax.faces.component.UpdateModelException: org.apache.myfaces.view.facelets.el
.ContextAwarePropertyNotWritableException: javax.el.PropertyNotWritableException

        at javax.faces.component.UIInput.updateModel(UIInput.java:436)
        at javax.faces.component.UIInput.processUpdates(UIInput.java:336)
        at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.
java:1506)
        at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.
java:1506)
        at org.icefaces.ace.component.panel.Panel.processUpdates(Panel.java:131)

        at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.
java:1506)
        at org.icefaces.ace.component.tabset.TabPane.processUpdates(TabPane.java
:106)
        at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.
java:1506)
        at javax.faces.component.UIForm.processUpdates(UIForm.java:264)
        at org.apache.myfaces.context.servlet.PartialViewContextImpl$PhaseAwareV
isitCallback.visit(PartialViewContextImpl.java:792)
        at org.apache.myfaces.component.visit.PartialVisitContext.invokeVisitCal
lback(PartialVisitContext.java:213)
        at javax.faces.component.UIForm.visitTree(UIForm.java:314)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1047)
        at javax.faces.component.UIComponentBase.visitTree(UIComponentBase.java:
1192)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1047)
        at javax.faces.component.UIComponentBase.visitTree(UIComponentBase.java:
1192)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1047)
        at javax.faces.component.UIComponentBase.visitTree(UIComponentBase.java:
1192)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1047)
        at javax.faces.component.UIComponentBase.visitTree(UIComponentBase.java:
1192)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1047)
        at javax.faces.component.UIComponentBase.visitTree(UIComponentBase.java:
1192)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1047)
        at javax.faces.component.UIComponentBase.visitTree(UIComponentBase.java:
1192)
        at javax.faces.component.UIComponent.visitTree(UIComponent.java:1047)
        at javax.faces.component.UIComponentBase.visitTree(UIComponentBase.java:
1192)
        at org.apache.myfaces.context.servlet.PartialViewContextImpl.processPart
ialExecute(PartialViewContextImpl.java:430)
        at org.apache.myfaces.context.servlet.PartialViewContextImpl.processPart
ial(PartialViewContextImpl.java:411)
        at javax.faces.context.PartialViewContextWrapper.processPartial(PartialV
iewContextWrapper.java:85)
        at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPar
tialViewContext.java:457)
        at javax.faces.context.PartialViewContextWrapper.processPartial(PartialV
iewContextWrapper.java:85)
        at javax.faces.component.UIViewRoot$UpdateModelPhaseProcessor.process(UI
ViewRoot.java:1825)
        at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1657)
        at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:918)
        at org.apache.myfaces.lifecycle.UpdateModelValuesExecutor.execute(Update
ModelValuesExecutor.java:38)
        at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl
.java:196)
        at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java
:143)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:292)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:207)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52
)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:240)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:207)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:212)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:106)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:141)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:79)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAcce
ssLogValve.java:616)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:88)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:522)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp
11Processor.java:1095)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(
AbstractProtocol.java:672)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpo
int.java:2500)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoin
t.java:2489)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:615)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskTh
read.java:61)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.myfaces.view.facelets.el.ContextAwarePropertyNotWritableEx
ception: javax.el.PropertyNotWritableException
        at org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.se
tValue(ContextAwareTagValueExpression.java:161)
        at javax.faces.component.UIInput.updateModel(UIInput.java:418)
        ... 58 more
Caused by: javax.el.PropertyNotWritableException
        at org.apache.myfaces.view.facelets.tag.jstl.core.IteratedValueExpressio
n.setValue(IteratedValueExpression.java:61)
        at org.apache.myfaces.view.facelets.el.FaceletStateValueExpression.setVa
lue(FaceletStateValueExpression.java:111)
        at org.apache.el.parser.AstIdentifier.setValue(AstIdentifier.java:129)
        at org.apache.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:2
57)
        at org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.se
tValue(ContextAwareTagValueExpression.java:153)
        ... 59 more