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https://issues.apache.org/jira/browse/WICKET-2041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Igor Vaynberg resolved WICKET-2041.
-----------------------------------
Resolution: Won't Fix
the behavior is correct, you should handle tostring() methods that return null.
i have cleaned up the exception - it will now be a ConversionException instead
of an ambiguous ClassCastException.
To fix this you can either subclass your node and return "" instead of null
from tostring() or install a converter that can properly convert nodes.
> 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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