log.log

# loaded from the correct place
[Loaded com.google.common.base.internal.Finalizer from file:/home/user/mywar/dqgjbr/war/WEB-INF/lib/guava-15.0-cdi1.0.jar]
FINALIZE CLASS LOC: file:/home/user/mywar/dqgjbr/war/WEB-INF/lib/guava-15.0-cdi1.0.jar

# also loaded from the correct place
[Loaded com.google.common.base.FinalizableReferenceQueue from file:/home/user/mywar/dqgjbr/war/WEB-INF/lib/guava-15.0-cdi1.0.jar]

# for some reason FinalizableReferenceQueue loads Finalizer again, but this time from the wrong place
[Loaded com.google.common.base.internal.Finalizer from file:/opt/wlserver/modules/features/weblogic.server.merged.jar]

# which results in this stack trace
<26-Jan-2016 11:45:18 o'clock GMT> <Warning> <HTTP> <BEA-101162> <User defined listener com.example.TestFilter failed: java.lang.AssertionError: java.lang.NoSuchMethodException: com.google.common.base.internal.Finalizer.startFinalizer(java.lang.Class, java.lang.ref.ReferenceQueue, java.lang.ref.PhantomReference).
java.lang.AssertionError: java.lang.NoSuchMethodException: com.google.common.base.internal.Finalizer.startFinalizer(java.lang.Class, java.lang.ref.ReferenceQueue, java.lang.ref.PhantomReference)
    at com.google.common.base.FinalizableReferenceQueue.getStartFinalizer(FinalizableReferenceQueue.java:308)
    at com.google.common.base.FinalizableReferenceQueue.<clinit>(FinalizableReferenceQueue.java:90)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:190)
    at com.example.TestFilter.contextInitialized(TestFilter.java:28)
    Truncated. see log file for complete stacktrace
Caused By: java.lang.NoSuchMethodException: com.google.common.base.internal.Finalizer.startFinalizer(java.lang.Class, java.lang.ref.ReferenceQueue, java.lang.ref.PhantomReference)
    at java.lang.Class.getMethod(Class.java:1665)
    at com.google.common.base.FinalizableReferenceQueue.getStartFinalizer(FinalizableReferenceQueue.java:302)
    at com.google.common.base.FinalizableReferenceQueue.<clinit>(FinalizableReferenceQueue.java:90)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:190)
    Truncated. see log file for complete stacktrace

TestFilter.java

package com.example;

import java.net.URL;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class TestFilter implements ServletContextListener
{
    public void contextInitialized(ServletContextEvent sce)
    {
        try
        {
            final URL finalizerPath = Class.forName("com.google.common.base.internal.Finalizer").getProtectionDomain().getCodeSource().getLocation();
            System.out.println("FINALIZE CLASS LOC: " + finalizerPath);//will print the path to the guava jar in our web-inf
            
            Class.forName("com.google.common.base.FinalizableReferenceQueue");//will error
        }
        catch (ClassNotFoundException e)
        {
        }
    }

    public void contextDestroyed(ServletContextEvent sce)
    {
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0" metadata-complete="true">

    <listener>
        <listener-class>com.example.TestFilter</listener-class>
    </listener>

</web-app>

weblogic.xml

<!DOCTYPE weblogic-web-app PUBLIC
        "-//BEA Systems, Inc.//DTD Web Application 8.1//EN"
        "http://www.bea.com/servers/wls810/dtd/weblogic810-web-jar.dtd">

<weblogic-web-app>

    <container-descriptor>
        <prefer-web-inf-classes>true</prefer-web-inf-classes>
    </container-descriptor>

</weblogic-web-app>