I have a RPC service: public class PersonsService { public void put(Person p){ ... } As serializer for Person I use BeanSerializer. Client sends a message (take a care, there is only one parameter type Person): <?xml version='1.0' encoding='UTF-8'?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance" xmlns:xsd="http://www.w3.org/1999/XMLSchema"> <SOAP-ENV:Body> <ns1:put xmlns:ns1="urn:PersonsService" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <person xmlns:ns2="urn:dk.test.soap.rpc" xsi:type="ns2:person"> <email xsi:type="xsd:string">[EMAIL PROTECTED]</email> <firstname xsi:type="xsd:string">John</firstname> <id xsi:type="xsd:long">1</id> <name xsi:type="xsd:string">Lehnon</name> </person> </ns1:put> </SOAP-ENV:Body> </SOAP-ENV:Envelope> Then I'v got an error message: <?xml version='1.0' encoding='UTF-8'?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance" xmlns:xsd="http://www.w3.org/1999/XMLSchema"> <SOAP-ENV:Body> <SOAP-ENV:Fault> <faultcode>SOAP-ENV:Server</faultcode> <faultstring>Exception while handling service request: dk.test.soap.rpc.PersonsService.put (org.apache.soap.Envelope,org.apache.soap.rpc.SOAPContext,org.apache.soap.rpc.SOAPContext) -- no signature match</faultstring> <faultactor>/soap/servlet/messagerouter</faultactor> <detail> </detail> </SOAP-ENV:Fault> Why messagerouter is looking for put(Envelope,SOAPContext,SOAPContext) ? Its run well on Linux + Tomcat, doesn'n run on Windows 2000 + Weblogic 5.1 Can it be a probem with CLASSPATH? Radek Wisniewski