org.zkoss.lang.contextClassLoader.class
From Documentation
Property:
org.zkoss.lang.contextClassLoader.class
Applicable: globally in zk.xml via <library-property> not as <custom-attribute>
Default: none (it implies Thread.currentThread().getContextClassLoader())
Since 8.0.2
It specifies the name of the class used to provide the customized context class loader. The class must implement the ContextClassLoaderFactory interface.