Warp fails with Java 11. An update of Javassist is needed.

The "Affects version" is wrong, I use Warp 1.0.0.Final, but it is not in the list.

Attached zip StatelessMaven.zip contains a full sample with a Warp test. Unzip it and run "mvn verify -Parq-remote" with Java 11. You must have started a WildFly 26 server on your local machine to make it work.

This exception raises:

org.jboss.arquillian.warp.exception.ClientWarpExecutionException:
enriching request failed; caused by:
javassist.NotFoundException: de.hsrm.cs.javaee8.statelessmaven.web.test.WarpIT$1
Caused by: java.lang.RuntimeException:
Could not transform and replicate class class java.util.Arrays$ArrayList:
Unable to transform inspection de.hsrm.cs.javaee8.statelessmaven.web.test.WarpIT$1:
de.hsrm.cs.javaee8.statelessmaven.web.test.WarpIT$1
Caused by: org.jboss.arquillian.warp.impl.client.transformation.InspectionTransformationException:
Unable to transform inspection de.hsrm.cs.javaee8.statelessmaven.web.test.WarpIT$1:
de.hsrm.cs.javaee8.statelessmaven.web.test.WarpIT$1
Caused by: javassist.NotFoundException: de.hsrm.cs.javaee8.statelessmaven.web.test.WarpIT$1

My workaround: in "StatelessMaven-web\pom.xml", I added an exclusion to the dependency "org.jboss.arquillian.extension:arquillian-warp-jsf":

        <dependency>
            <groupId>org.jboss.arquillian.extension</groupId>
            <artifactId>arquillian-warp-jsf</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>javassist</groupId>
                    <artifactId>javassist</artifactId>
                </exclusion>
              </exclusions>
        </dependency>

And I added a new dependency:

      <dependency>
        <groupId>org.javassist</groupId>
        <artifactId>javassist</artifactId>
        <scope>test</scope>
      </dependency>

No version number is needed, as "org.javassist:javassist" is provided by the WildFly bom. For WildFly 26, this is "3.27.0-GA".

Now, the test works.

I tested also with other versions of Javassist and Java runtime:

Different Error with "javassist" 3.23.0-GA

enriching request failed; caused by:
java.lang.NullPointerException: null
Caused by: java.lang.RuntimeException:
Could not transform and replicate class class java.util.Arrays$ArrayList:
Unable to convert org.jboss.arquillian.warp.generated.A17873520-46ef-4669-b0df-7b3ee0cd2c11 to class
Caused by: org.jboss.arquillian.warp.impl.client.transformation.InspectionTransformationException: Unable to convert org.jboss.arquillian.warp.generated.A17873520-46ef-4669-b0df-7b3ee0cd2c11 to class
Caused by: java.lang.NullPointerException

It starts working with 3.24.0-GA

Error with Java 17 (might also be caused by as missing module info in my sample?):
org.jboss.arquillian.warp.exception.ClientWarpExecutionException:
enriching request failed; caused by:
java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @67b92f0a
Caused by: java.lang.RuntimeException:
Could not transform and replicate class class java.util.Arrays$ArrayList:
Unable to convert org.jboss.arquillian.warp.generated.Ab3d4f9c3-8569-4969-8a2a-3a3eade737ef to class
Caused by: org.jboss.arquillian.warp.impl.client.transformation.InspectionTransformationException: Unable to convert org.jboss.arquillian.warp.generated.Ab3d4f9c3-8569-4969-8a2a-3a3eade737ef to class
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @67b92f0a