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https://issues.apache.org/jira/browse/TAP5-2674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17333421#comment-17333421
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Thiago Henrique De Paula Figueiredo commented on TAP5-2674:
-----------------------------------------------------------
Thanks [~cbo-itop] for reporting the ticket, [~vlamp] for providing the patch
and [~ben-ng] for applying it!
> Type coercer contribution - cast exception in equals
> -----------------------------------------------------
>
> Key: TAP5-2674
> URL: https://issues.apache.org/jira/browse/TAP5-2674
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.7.2
> Reporter: Cédric BOONE
> Assignee: Ben Weidig
> Priority: Blocker
> Fix For: 5.7.3
>
> Attachments: TAP5-2674.patch
>
>
> I have multiple Tapestry modules which contribute to type coercer, I can't
> make it work.
>
> I contribute TypeCoercer this way
>
> {code:java}
> public static void
> contributeTypeCoercer(MappedConfiguration<CoercionTuple.Key, CoercionTuple>
> configuration) {
> Coercion<String, Class> coercion = path -> {
> try {
> return Class.forName(path);
> } catch (ClassNotFoundException e) {
> return null;
> }
> };
> CoercionTuple<String, Class> tuple = new CoercionTuple<>(String.class,
> Class.class, coercion);
> configuration.override(tuple.getKey(), tuple);
> }{code}
>
> When I try to access a Tapestry page I get the following:
>
>
> {code:java}
> Caused by: java.lang.ClassCastException:
> org.apache.tapestry5.commons.services.CoercionTuple$Key cannot be cast to
> org.apache.tapestry5.commons.services.CoercionTuple
> at
> org.apache.tapestry5.commons.services.CoercionTuple$Key.equals(CoercionTuple.java:184)
> at java.util.HashMap.getNode(HashMap.java:572)
> at java.util.HashMap.get(HashMap.java:557)
> at
> org.apache.tapestry5.ioc.internal.ValidatingMappedConfigurationWrapper.override(ValidatingMappedConfigurationWrapper.java:122)
> at
> **********.SessionsSubModule.contributeTypeCoercer(SessionsSubModule.java:63)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.tapestry5.ioc.internal.ContributionDefImpl.invokeMethod(ContributionDefImpl.java:133)
> ... 219 more
> {code}
>
> The exception is raised in the equals method of CoercionTuple.Key:
> {code:java}
> @Override
> public boolean equals(Object obj)
> {
> if (this == obj)
> return true;
> if (obj == null)
> return false;
> if (getClass() != obj.getClass())
> return false;
> // Exception is raised here
> CoercionTuple other = (CoercionTuple) obj;
> if (sourceType == null)
> {
> if (other.sourceType != null)
> return false;
> } else if (!sourceType.equals(other.sourceType))
> return false;
> if (targetType == null)
> {
> if (other.targetType != null)
> return false;
> } else if (!targetType.equals(other.targetType))
> return false;
> return true;
> }
> {code}
> The equals is called in the HashMap#get implementation (used in
> ValidatingMappedConfigurationWrapper)
>
> With this part of code:
> {code:java}
> ...
> if (getClass() != obj.getClass())
> return false;
> CoercionTuple other = (CoercionTuple) obj;
> ...
> {code}
> the obj variable can't be a CoercionTuple, it will be a CoercionTuple.Key
> (which is the case in the implementation of HashMap<CoercionTupe.Key,
> CoercionTuple>#get).
> I might not have understood something, if it is the case, I'm sorry for the
> trouble.
>
>
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