Exclude provided jackson version from JBoss 7 EAP

问题

I am trying to use a newer version of Jackson as JBoss 7 EAP delivers. To solve my issue I have created a jboss-deployment-structure.xml file which is contained in my war deployment.

<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.2">
    <deployment>
        <exclusions>
            <!--<module name="com.fasterxml.jackson.core.jackson-core" slot="main" />-->
            <!--<module name="com.fasterxml.jackson.core.jackson-annotations" slot="main" />-->
            <module name="com.fasterxml.jackson.core.jackson-databind" slot="main" />
        </exclusions>
    </deployment>
</jboss-deployment-structure>

But it seems that JBoss uses the delivered module instead of the provided dependency.

ModuleClassLoader for Module "com.fasterxml.jackson.core.jackson-databind:main" from local module loader @134593bf (finder: local module finder @4bb4de6a (roots: ...\jboss-eap-7.0\modules,...\jboss-eap-7.0\modules\system\layers\base))

I have found a similar question JBoss 7 Classloader -- Exclude Module Implementation but it didn't help me.

What did I miss?

回答1:

I ran into the exact same problem with Jackson, and I got it to work in my EAP 7 using this jboss-deployment-structure.xml :

<jboss-deployment-structure>
    <deployment>
        <exclusions>
            <module name="com.fasterxml.jackson.core.jackson-core" />
            <module name="com.fasterxml.jackson.core.jackson-annotations" />
            <module name="com.fasterxml.jackson.core.jackson-databind" />
            <module name="com.fasterxml.jackson.jaxrs.jackson-jaxrs-json-provider" />
            <module name="org.jboss.resteasy.resteasy-jackson2-provider" />
            <module name="org.jboss.resteasy.resteasy-jackson-provider" />
        </exclusions>
    </deployment>
</jboss-deployment-structure>

It appears like as long as any other modules list jackson as their dependency in their respective module.xml, it just simply doesn't get excluded, and EAP can't be arsed to even throw a warning about it.

Edit 2018-02-19: When upgrading from EAP 7.0.0 to 7.1.0, things broke again, owing to updated Jackson jars.

This is the crucial part of the stacktrace:

Caused by: javax.ejb.EJBException: WFLYEJB0442: Unexpected Error
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:185)
[...]
    at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:161) [wildfly-ee-7.1.0.GA-redhat-11.jar:7.1.0.GA-redhat-11]
    ... 11 more
Caused by: java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    [...]()Lcom/fasterxml/jackson/databind/ObjectMapper; @89: invokevirtual
  Reason:
    Type 'com/fasterxml/jackson/datatype/jdk8/Jdk8Module' (current frame, stack[1]) is not assignable to 'com/fasterxml/jackson/databind/Module'

So we exclude those as well:

<jboss-deployment-structure>
    <deployment>
        <exclusions>
            <module name="com.fasterxml.jackson.core.jackson-core" />
            <module name="com.fasterxml.jackson.core.jackson-annotations" />
            <module name="com.fasterxml.jackson.core.jackson-databind" />
            <module name="com.fasterxml.jackson.datatype.jackson-datatype-jdk8" />
            <module name="com.fasterxml.jackson.datatype.jackson-datatype-jsr310" />
            <module name="com.fasterxml.jackson.jaxrs.jackson-jaxrs-json-provider" />
            <module name="org.jboss.resteasy.resteasy-jackson2-provider" />
            <module name="org.jboss.resteasy.resteasy-jackson-provider" />
        </exclusions>
    </deployment>
</jboss-deployment-structure>

回答2:

It looks like the jax-rs submodule from jboss eap 7 uses jackson. As soon as you skip this submodule, you will get rid of the jboss jackson version:

<?xml version="1.0" encoding="UTF-8"?>
<jboss-deployment-structure>
    <deployment>
        <exclude-subsystems>
            <subsystem name="jaxrs"/>
        </exclude-subsystems>
    </deployment>
</jboss-deployment-structure>

(only makes sense if you don't use jaxrs ;-)

来源：https://stackoverflow.com/questions/38724430/exclude-provided-jackson-version-from-jboss-7-eap