Dependency on XStream, even when not using any XStream serializers

[athurm]

It's currently not possible to use Axon without XStream getting configured, even when XStream is not used for any serializers.

<dependency>
    <groupId>org.axonframework</groupId>
    <artifactId>axon-messaging</artifactId>
    <version>${version.axon}</version>
    <exclusions>
        <exclusion>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>
        </exclusion>
    </exclusions>
</dependency>

JpaSagaStore:361

private Supplier serializer = XStreamSerializer::defaultSerializer;

Caused by: java.lang.NoClassDefFoundError: com/thoughtworks/xstream/mapper/CannotResolveClassException
at deployment.war//org.axonframework.modelling.saga.repository.jpa.JpaSagaStore$Builder.>(JpaSagaStore.java:361)

Same Issue was with QuartzEventScheduler :
Axon 4.5
[#1685] Remove QuartzEventScheduler hard dependency on XStream #1690
Remove hard dependency on XStream in QuartzEventScheduler #1685

[mvonrenteln]

I'll provide a pull request for this issue.

[mvonrenteln]

The Change would be like in https://github.com/AxonFramework/AxonFramework/pull/1440/files

[mvonrenteln]

@smcvb A fix is provided in #1932

[smcvb]

I've changed the type from "bug" to "enhancement," as I wouldn't describe this as a framework bug at this stage.

Of course, it is not ideal, hence why a pull request is warranted.
From that end, thanks for the effort, @mvonrenteln!

I'll take a look ASAP.