#2 ObjInpStrm.latestUserDefinedLoader() + plugin Classloaders

[Dhruv Patel]

Hi Team,

i am developing one application it uses "platonos plugin engine".

server
|
------ plugin 1
------ plugin 2

basically server accepts plugins, install them and manage their lifecycle.

plugin register their service classes to server

Note : service classes loaded by plugin class loader

server loaded by system default class loader

when any request come to server server identifies proper plugin class from registry and call method of plugin

before calling it is doing

Thread.currentThread().setContextClassLoader(pluginClassLoader);

this works better for non custom objects. like standard JRE objects (Int, Long,String etc..)

now my one plugin have one custom serialized object

which visible in plugin class loader.

but when it used Java ObjectInputStream to deserialize

protected Class<?> resolveClass(ObjectStreamClass desc)
throws IOException, ClassNotFoundException
{
....
return Class.forName(name, false, latestUserDefinedLoader());
....

}

latestUserDefinedLoader() return server class loader (IN DEBUG VIEW)

which causes class not found exception.

actually it should use plugin class loader

but this same scenario works properly in tomcat with different classloaders.

i am surprised how tomcat able to change behaviour of latestUserDefinedLoader()

do i need to change classloader for some security or permission or something else pls help ???

awaiting for ur reply !!!!