XmlDriver: callback-method setup raises exception

[curzio-della-santa]

Q	A
Bug report?	yes
Feature request?	no
BC Break report?	no
RFC?	no

Steps required to reproduce the problem

Deserialize class having a metadata described in a separate XML file, e.g:

<?xml version="1.0" encoding="UTF-8" ?>
<serializer>
    <class
            name="Foo"
            exclusion-policy="ALL"
            accessor-order="custom"
            custom-accessor-order="bar">
        <callback-method name="afterDeserialization" type="post-deserialize" />
        <property
                name="bar"
                type="integer"
                since-version="1.0"
                expose="true"
                access-type="property">
        </property>
    </class>
</serializer>

Expected Result

• Correct deserializatio

Actual Result

Using PHP 7.4 I get a configuration exception (I've removed irrelevant stack and adapted for privacy):

{
    "trace": [
        {
            "file": "/app/vendor/jms/serializer/src/Metadata/Driver/XmlDriver.php",
            "line": 374,
            "function": "__construct",
            "class": "Metadata\\MethodMetadata",
            "type": "->",
            "args": [
                {
                    "0": "bar"
                },
                "afterDeserialization"
            ]
        },
        {
            "file": "/app/vendor/jms/metadata/src/Driver/AbstractFileDriver.php",
            "line": 32,
            "function": "loadMetadataFromFile",
            "class": "JMS\\Serializer\\Metadata\\Driver\\XmlDriver",
            "type": "->",
            "args": [
                {
                    "name": "Foo"
                },
                "some-path/Foo.xml"
            ]
        }
    ],
    "type": "http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html",
    "title": "Internal Server Error",
    "status": 500,
    "detail": "Argument 1 passed to Metadata\\MethodMetadata::__construct() must be of the type string, object given, called in /app/vendor/jms/serializer/src/Metadata/Driver/XmlDriver.php on line 374"
}

I've already written a PR for the needed fix: #1310

[goetas]

fixed in #1310