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TreeTable/Datatable: Dynamic Columns Issue

See original GitHub issue

1) Environment

PrimeFaces version: 7.0
Does it work on the newest released PrimeFaces version? Version? NO
Does it work on the newest sources in GitHub? (Build by source -> https://github.com/primefaces/primefaces/wiki/Building-From-Source) NO
Application server + version: ALL
Affected browsers: ALL

2) Expected behavior

3) Actual behavior

org.primefaces.component.api.DynamicColumn cannot be cast to org.primefaces.component.column.Column: java.lang.ClassCastException: org.primefaces.component.api.DynamicColumn cannot be cast to org.primefaces.component.column.Column
	at org.primefaces.component.treetable.TreeTable.updateColumnsVisibility(TreeTable.java:655)
	at org.primefaces.component.treetable.TreeTableRenderer.preRender(TreeTableRenderer.java:226)
	at org.primefaces.component.treetable.TreeTableRenderer.encodeEnd(TreeTableRenderer.java:161)

4) Steps to reproduce

Press “Refresh” button

5) Sample XHTML

<h:form id="form">
	<p:commandButton value="Refresh" update="@form" />
	<p:commandButton id="toggler" type="button" value="Columns" style="float:right" icon="ui-icon-calculator" />
	<p:columnToggler datasource="idDataTable" trigger="toggler" />

	<p:treeTable id="idDataTable" var="cars" value="#{tableBean.carsTree}">
		<p:column value="Column">
			<h:outputText value="Column" />
		</p:column>
		<p:columns value="#{tableBean.columns}" var="column" columnIndexVar="columnIndx" visible="true">
			<f:facet name="header">
				#{column.header}
			</f:facet>
			<h:outputText value="#{cars[column.property]}" />
		</p:columns>
	</p:treeTable>
</h:form>

6) Sample bean

public class TableBean implements Serializable {
    private List<ColumnModel> columns = new ArrayList<ColumnModel>();
    private DefaultTreeNode carsTree = new DefaultTreeNode();

	public TableBean() {
        populateColumns();
        
        Car car = new Car();
        car.setManufacturer("Audi");
        car.setModel("A4");
        car.setYear(2015);
        new DefaultTreeNode(car, carsTree);
    }

    public void populateColumns() {
        String[] columnKeys = new String[]{"model","year","color"};
        for(String columnKey : columnKeys) {
            columns.add(new ColumnModel(columnKey.toUpperCase(), columnKey));
        }
    }
    //getters and setters

    public List<ColumnModel> getColumns() {
		return columns;
	}

	public void setColumns(List<ColumnModel> columns) {
		this.columns = columns;
	}

    public DefaultTreeNode getCarsTree() {
		return carsTree;
	}

	public void setCarsTree(DefaultTreeNode carsTree) {
		this.carsTree = carsTree;
	}

	static public class ColumnModel {
        private String header;
        private String property;

        public ColumnModel(String header, String property) {
            this.header = header;
            this.property = property;
        }
        public String getHeader() {
            return header;
        }
        public String getProperty() {
            return property;
        }
    }
}