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    <title>Magnolia - Issue tracker</title>
    <link>https://jira.magnolia-cms.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-uk</language>    <build-info>
        <version>9.4.2</version>
        <build-number>940002</build-number>
        <build-date>19-01-2023</build-date>
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<item>
            <title>[MGNLUI-4575] ClassCastException when validating ComboBox item</title>
                <link>https://jira.magnolia-cms.com/browse/MGNLUI-4575</link>
                <project id="10625" key="MGNLUI">Magnolia UI</project>
                    <description>&lt;p&gt;This is a follow-up issue to &lt;a href=&quot;https://jira.magnolia-cms.com/browse/MGNLUI-4519&quot; title=&quot;Migrate select fields to Vaadin 8&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MGNLUI-4519&quot;&gt;&lt;del&gt;MGNLUI-4519&lt;/del&gt;&lt;/a&gt;. To reproduce&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;enable the new content-app.yml&apos;s configuration for a single select (combo box) i.e.
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;
class: info.magnolia.ui.databinding.definition.JcrSingleSelectFieldDefinition
 datasource:
  class: info.magnolia.ui.datasource.jcr.JcrDatasourceDefinition
  workspace: contacts
  describeByProperty: lastName
  allowedNodeTypes:
  - mgnl:contact 
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;try to select an item&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The following ClassCastException occurs&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;
  Caused by: java.lang.ClassCastException: Cannot &lt;span class=&quot;code-keyword&quot;&gt;cast&lt;/span&gt; java.lang.&lt;span class=&quot;code-object&quot;&gt;String&lt;/span&gt; to javax.jcr.Node
        	at java.lang.&lt;span class=&quot;code-object&quot;&gt;Class&lt;/span&gt;.&lt;span class=&quot;code-keyword&quot;&gt;cast&lt;/span&gt;(&lt;span class=&quot;code-object&quot;&gt;Class&lt;/span&gt;.java:3369) ~[?:1.8.0_131]
        	at com.vaadin.data.Binder$BindingBuilderImpl.lambda$createConverter$f6099586$1(Binder.java:864) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Converter.lambda$&lt;span class=&quot;code-keyword&quot;&gt;null&lt;/span&gt;$fdd4de71$1(Converter.java:105) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Result.of(Result.java:91) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Converter.lambda$from$28ca080b$1(Converter.java:105) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Converter$1.convertToModel(Converter.java:131) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Converter$2.lambda$convertToModel$5daf174e$1(Converter.java:167) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.SimpleResult.flatMap(SimpleResult.java:66) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.ValidationResultWrap.flatMap(ValidationResultWrap.java:66) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Converter$2.convertToModel(Converter.java:167) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Binder$BindingImpl.doConversion(Binder.java:1097) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Binder$BindingImpl.doValidation(Binder.java:1114) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Binder$BindingImpl.validate(Binder.java:1061) ~[vaadin-server-8.4.2.jar:8.4.2]
        	at com.vaadin.data.Binder$Binding.validate(Binder.java:135) ~[vaadin-server-8.4.2.jar:8.4.2]
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;From a first debugging session it looks something is wrong with the binding configuration. Upon selecting an item, the Vaadin&apos;s validation process kicks in and chained converters are invoked. At some point, JcrItemToLinkConverter is called and correctly converts the presentation type (JCR Node) into its model (an identifier, i.e. String). Then, other validators are called and some internal Vaadin converter expects again a Node but gets a String, hence ClassCastEx. Possibly the binding per locale implementation is messing up things due to an incomplete converter configuration?&lt;/p&gt;

&lt;p&gt;See info.magnolia.ui.framework.databinding.view.FormView as a starting point for the logic creating the Binder per Locale.&lt;/p&gt;</description>
                <environment></environment>
        <key id="69019">MGNLUI-4575</key>
            <summary>ClassCastException when validating ComboBox item</summary>
                <type id="3" iconUrl="https://jira.magnolia-cms.com/secure/viewavatar?size=xsmall&amp;avatarId=10898&amp;avatarType=issuetype">Task</type>
                                            <priority id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/priorities/neutral.gif">Neutral</priority>
                        <status id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are not closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="7">Not an issue</resolution>
                                        <assignee username="fgrilli">Federico Grilli</assignee>
                                    <reporter username="fgrilli">Federico Grilli</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Aug 2018 12:18:57 +0200</created>
                <updated>Wed, 26 Jun 2019 09:26:02 +0200</updated>
                            <resolved>Mon, 20 Aug 2018 17:00:07 +0200</resolved>
                                                    <fixVersion>6.0</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="167147" author="fgrilli" created="Mon, 20 Aug 2018 17:00:07 +0200"  >&lt;p&gt;Turned out to be a wrong type in definition&lt;/p&gt;</comment>
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