Can't load custom appender from applet/JNLP

2014-10-23 19:39:40,778 DEBUG Generated plugins in 0.005919 seconds, packages: [com.mycompany.myproduct.common.log4jext, org.apache.logging.log4j.core], preload: true.
basic: JNLP2ClassLoader.findClass: org.apache.logging.log4j.core.config.xml.XmlConfiguration$Status: try again ..
basic: JNLP2ClassLoader.findClass: org.apache.logging.log4j.core.config.xml.XmlConfiguration$ErrorType: try again ..
2014-10-23 19:39:40,781 ERROR Error processing element SwHttp: CLASS_NOT_FOUND
2014-10-23 19:39:40,782 INFO Scanning for classes in [http://neptune.domain.mycompany.com:9249/app/applets/log4j-core-2.0.2-signed.jar] matching criteria: annotated with @Plugin
2014-10-23 19:39:40,782 ERROR Could not search jar file 'http:\neptune.domain.mycompany.com:9249\app\applets\log4j-core-2.0.2-signed.jar' for classes matching criteria: annotated with @Plugin file not found java.io.FileNotFoundException: http:\neptune.domain.mycompany.com:9249\app\applets\log4j-core-2.0.2-signed.jar (The filename, directory name, or volume label syntax is incorrect)
	at java.io.FileInputStream.open(Native Method)
	at java.io.FileInputStream.<init>(Unknown Source)
	at org.apache.logging.log4j.core.config.plugins.util.ResolverUtil.loadImplementationsInJar(ResolverUtil.java:300)
	at org.apache.logging.log4j.core.config.plugins.util.ResolverUtil.findInPackage(ResolverUtil.java:196)
	at org.apache.logging.log4j.core.config.plugins.util.PluginManager.loadFromPackages(PluginManager.java:177)
	at org.apache.logging.log4j.core.config.plugins.util.PluginManager.collectPlugins(PluginManager.java:156)
	at org.apache.logging.log4j.core.config.plugins.util.PluginManager.collectPlugins(PluginManager.java:136)
	at org.apache.logging.log4j.core.lookup.Interpolator.<init>(Interpolator.java:46)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:337)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:150)
	at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:364)
	at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:422)
	at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:146)
	at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:85)
	at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:37)
	at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:474)
	at com.mycompany.myproduct.applet.myproductApplet.<clinit>(myproductApplet.java:125)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at java.lang.Class.newInstance(Unknown Source)
	at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter$1.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

2014-10-23 19:37:32,424 DEBUG Starting configuration XmlConfiguration[location=C:\Users\myuser\Documents\_mycompany\Dev\myproject\trunk\java\com.mycompany.myproduct.staticresources\bin\com\mycompany\myproduct\staticresources\applet\log4j2.xml]
2014-10-23 19:37:32,429 INFO Scanning for classes in [/C:/Users/myuser/Documents/_mycompany/Dev/myproject/trunk/java/com.mycompany.myproduct.common/bin/com/mycompany/myproduct/common/log4jext] matching criteria: annotated with @Plugin
2014-10-23 19:37:32,429 DEBUG Checking to see if class com.mycompany.myproduct.common.log4jext.LogQueue matches criteria [annotated with @Plugin]
2014-10-23 19:37:32,429 DEBUG Checking to see if class com.mycompany.myproduct.common.log4jext.SwHttpAppender matches criteria [annotated with @Plugin]
2014-10-23 19:37:32,430 DEBUG Checking to see if class com.mycompany.myproduct.common.log4jext.SwHttpAppenderRunnable matches criteria [annotated with @Plugin]
2014-10-23 19:37:32,435 DEBUG Generated plugins in 0.010325 seconds, packages: [com.mycompany.myproduct.common.log4jext], preload: false.
2014-10-23 19:37:32,437 DEBUG Found Plugin Map at jar:file:/C:/Users/myuser/Documents/_mycompany/Dev/myproject/trunk/java/com.mycompany.myproduct.common/src/lib/log4j-core-2.0.2.jar!/META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat
...etc...