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From "Jeroen Vlek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CXF-5722) JAXB generated Enum throws IllegalArgumentException by unmarshalling as @QueryParam
Date Tue, 06 May 2014 10:02:22 GMT

    [ https://issues.apache.org/jira/browse/CXF-5722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13990500#comment-13990500
] 

Jeroen Vlek commented on CXF-5722:
----------------------------------

Hi there, 

I just wanted to out myself as the one submitting this bug to Andrei. If you have any more
questions please let me know, although Andrei's example is exhaustive and self-explanatory.

Cheers,
Jeroen Vlek

> JAXB generated Enum throws IllegalArgumentException by unmarshalling as @QueryParam
> -----------------------------------------------------------------------------------
>
>                 Key: CXF-5722
>                 URL: https://issues.apache.org/jira/browse/CXF-5722
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-RS
>    Affects Versions: 3.0.0-milestone2
>            Reporter: Andrei Shakirin
>            Assignee: Andrei Shakirin
>
> By processing request with Query parameter, InjectionUtils tries to recognize and instantiate
parameter class.
> In case of Enum parameter class, InjectionUtils.handleParameter() method calls in loop
following methods: "fromString", "fromValue", "valueOf" using reflection. If method returns
null, it tries the next one:
>         if (result == null) {
>             // check for valueOf(String) static methods
>             String[] methodNames = cls.isEnum() 
>                 ? new String[] {"fromString", "fromValue", "valueOf"} 
>                 : new String[] {"valueOf", "fromString"};
>             for (String mName : methodNames) {   
>                 result = evaluateFactoryMethod(value, cls, pType, mName);
>                 if (result != null) {
>                     break;
>                 }
>             }
> The problem is that factory methods in JAXB generated Enum behaves differently:
> - valueOf() accepts enum identifier (not value)
> - fromValue() accepts enum value
> Both methods throws IllegalArgumentException by worng argument and do not return null,
how current code expecting. Because formValue() is tried before valueOf(), it throws exception
and valueOf() is never tried, despite of fact that it will convert the value correctly.
> As a result following method throws IllegalArgumentException:
> 1) method:
>     @GET
>     @Path("/enum/")
>     Response checkEnum(@QueryParam("car") CarType car);
> 2) generated enum:
> @XmlRootElement(name = "Car")
> @XmlType(name = "carType")
> @XmlEnum
> public enum CarType {
>     @XmlEnumValue("Audi")
>     AUDI("Audi"),
>     @XmlEnumValue("Golf")
>     GOLF("Golf"),
>     BMW("BMW");
>     private final String value;
>     CarType(String v) {
>         value = v;
>     }
>     public String value() {
>         return value;
>     }
>     public static CarType fromValue(String v) {
>         for (CarType c: CarType.values()) {
>             if (c.value.equals(v)) {
>                 return c;
>             }
>         }
>         throw new IllegalArgumentException(v);
>     }
> }
> 3) call:
> customerService.checkEnum(CarType.AUDI);



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