The problem seems to occur only when an argument of a "remote" procedure call is an instance of an entity created on the client side by : var customer = Seam.Component.newInstance("customer"); eg : the entity object : anonymous wrote : @Entity | @Name("testObject") | @Scope(CONVERSATION) | public class TestObject { | @Id | private String stringId; | | public String getStringId() { | return stringId; | } | | public void setStringId(String stringId) { | this.stringId = stringId; | } | } in a seam component : anonymous wrote : @Stateful | @Name("testManager") | @Scope(ScopeType.CONVERSATION) | public class TestManager implements Manager { | public void testOnly(TestObject test) { | System.out.println("!!!!!!!!!!!!!!!!!!"); | System.out.println(test); | } | } in js code : anonymous wrote : function sayHelloCallback(result) { } | testManager = Seam.Component.getInstance("testManager") ; | testObject = Seam.Component.newInstance("testObject") ; | testManager.testAttachTest(testObject,sayHelloCallback) <-- error | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4059953#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...