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https://issues.apache.org/jira/browse/WW-5424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17851250#comment-17851250
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Lukasz Lenart commented on WW-5424:
-----------------------------------
There are two problems here, one is the class cast exception and this can be
easily solved by using {{\"}} instead of {{{}'{}}}.
The second problem is related to {{scope="page"}} as this sets value in scope
of page not action, where the {{<s:property/>}} tag reads value from top of the
stack which is an action. To access such value you should use {{<s:property
value="#attr['b']" />}}
> ClassCastException with tag "set" when variable name has length=1
> -----------------------------------------------------------------
>
> Key: WW-5424
> URL: https://issues.apache.org/jira/browse/WW-5424
> Project: Struts 2
> Issue Type: Bug
> Components: Core Tags
> Affects Versions: 6.4.0
> Reporter: Daniel López
> Priority: Major
> Fix For: 6.5.0
>
>
> I think it is caused by the refactor of WW-5333
> When the tag "set" is used to define a variable whose name is of length 1, a
> java.lang.ClassCastException (class java.lang.Character cannot be cast to
> class java.lang.String ) is thrown.
>
> Test case:
> {code:java}
> // code placeholder
> <s:set var="a" value="1" /> a = <s:property value="a"/>
> <s:set var="b" value="2" scope="page" /> b = <s:property value="b" />{code}
> Expected result:
> {code:java}
> // code placeholder
> a = 1
> b = 2{code}
> actual result:
> {code:java}
> a = 1
> b ={code}
> Both "s:set" throws exception when storing the value in page context. Value
> of a is retrieved as it is successfully saved in default context
> Exception trace
> {code:java}
> // code placeholder
> Error setting value [2] with expression [#attr['b']]
> java.lang.ClassCastException: class java.lang.Character cannot be cast to
> class java.lang.String (java.lang.Character and java.lang.String are in
> module java.base of loader 'bootstrap')
> at org.apache.struts2.dispatcher.AttributeMap.put(AttributeMap.java:46)
> ~[struts2-core-6.4.0.jar:6.4.0]
> at
> com.opensymphony.xwork2.ognl.accessor.XWorkMapPropertyAccessor.setProperty(XWorkMapPropertyAccessor.java:130)
> ~[struts2-core-6.4.0.jar:6.4.0]
> at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:3359) ~[ognl-3.3.4.jar:?]
> at ognl.ASTProperty.setValueBody(ASTProperty.java:134) ~[ognl-3.3.4.jar:?]
> at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)
> ~[ognl-3.3.4.jar:?]
> at ognl.SimpleNode.setValue(SimpleNode.java:308) ~[ognl-3.3.4.jar:?]
> at ognl.ASTChain.setValueBody(ASTChain.java:227) ~[ognl-3.3.4.jar:?]
> at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)
> ~[ognl-3.3.4.jar:?]
> at ognl.SimpleNode.setValue(SimpleNode.java:308) ~[ognl-3.3.4.jar:?]
> at ognl.Ognl.setValue(Ognl.java:829) ~[ognl-3.3.4.jar:?]
> at com.opensymphony.xwork2.ognl.OgnlUtil.ognlSet(OgnlUtil.java:585)
> ~[struts2-core-6.4.0.jar:6.4.0]
> at com.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:522)
> ~[struts2-core-6.4.0.jar:6.4.0]
> at
> com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:258)
> [struts2-core-6.4.0.jar:6.4.0]
> at
> com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:245)
> [struts2-core-6.4.0.jar:6.4.0]
> at org.apache.struts2.components.Set.end(Set.java:113)
> [struts2-core-6.4.0.jar:6.4.0]
> at
> org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:38)
> [struts2-core-6.4.0.jar:6.4.0]
> {code}
> When name is of length 1, the key is created as Character not String, and it
> fails when trying to store in a
> AttributeMap extends AbstractMap<String, Object>
>
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