[jira] Assigned: (WICKET-2041) ClassCastException in DefaultConverter.convertToString

["Igor Vaynberg (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-2041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Igor Vaynberg reassigned WICKET-2041:
-------------------------------------

    Assignee: Igor Vaynberg

> ClassCastException in DefaultConverter.convertToString
> ------------------------------------------------------
>
>                 Key: WICKET-2041
>                 URL: https://issues.apache.org/jira/browse/WICKET-2041
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 1.4-M3
>            Reporter: Christian Spieß
>            Assignee: Igor Vaynberg
>
> Problem : 
> Display of a DefaultMutableTreeNode without userObject (userObject=null)
> will result in a class cast exception.
> java.lang.ClassCastException: javax.swing.tree.DefaultMutableTreeNode cannot be cast to java.lang.String
>      at org.apache.wicket.util.convert.ConverterLocator$DefaultConverter.convertToString(ConverterLocator.java:127)
>      at org.apache.wicket.Component.getDefaultModelObjectAsString(Component.java:1653)
>      at org.apache.wicket.Component.getDefaultModelObjectAsString(Component.java:1625)
>      at org.apache.wicket.markup.html.basic.Label.onComponentTagBody(Label.java:115)
>      at org.apache.wicket.Component.renderComponent(Component.java:2561)
>      at org.apache.wicket.markup.html.WebComponent.onRender(WebComponent.java:62)
>      at org.apache.wicket.Component.render(Component.java:2398)
> Problem:
> org.apache.wicket.util.lang.Objects
> 	public static Object convertValue(final Object value, final Class<?> toType)
> 	{
>           //...
> 	  return (result != null) ? result : value;
> 	}
> 	
> result = null // because DefaultMutableTreeNode::toString() = null
> so this function will return the DefaultMutableTreeNode object 
> 	
> org.apache.wicket.util.convert.ConverterLocator :: DefaultConverter
> 		public String convertToString(X value, Locale locale)
> 		{
>                         //...
> 			return (String)Objects.convertValue(value, String.class);
> 		}
> Here the DefaultMutableTreeNode will be cast to "(String)" which leads to a ClassCastException.

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