The Hashtable mapping is implicit: you do not need it in your deploymentdescriptor.
As you can see, the error is actually finding a serializer for java.util.Vector$1. This class exists back to JDK 1.2; it is an anonymous class implementing the Enumeration interface defined by the Vector#elements() method. I take it that the elements in your Hashtable are such Enumerations. What you need to do is write a serializer and deserializer for such Enumerations and map them to java.util.Vector$1 (map the serializer on the server and the deserializer on the client). Alternatively, if you can rewrite the method (or add a new method) to return a Hashable of Vectors instead, the built-in Vector serializer will do the work for you. Scott Nichol ----- Original Message ----- From: "Vijay Shinde" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Thursday, January 02, 2003 12:30 PM Subject: Re: SOAP - method return > Scott, > > Here are the details. > > I guess i need to provide the mapping in my DeploymentDescriptor.xml. > > Here is my descriptor. > <dd:service xmlns:dd="http://xml.apache.org/xml-soap/deployment"; > id="urn:ldap"> > <dd:provider type="java" > scope="Application" > methods="getLDAP"> > <dd:java class="LDAPCall" static="false" /> > </dd:provider> > > <dd:faultListener>org.apache.soap.server.DOMFaultListener</dd:faultListe ner> > > <dd:mappings> > <dd:map encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"; > xmlns:x="urn:ldap" qname="x:ldap" > javaType="java.util.Hashtable" > > java2XMLClassName="org.apache.soap.encoding.soapenc.HashtableSerializer" > > xml2JavaClassName="org.apache.soap.encoding.soapenc.HashtableSerializer" /> > > </dd:mappings> > </dd:service> > > I am returning Hashtable from my method call. > > I am getting following exception. > > The SOAP Server says: http://localhost:8080/soap/servlet/rpcrouter > Ouch, the call failed: > Fault Code = SOAP-ENV:Server > Fault String = java.lang.IllegalArgumentException: No Serializer found to > seri > alize a 'java.util.Vector$1' using encoding style > 'http://schemas.xmlsoap.org/so > ap/encoding/'. > > I have provide mapping for hashtable why it is throwing me error for vector > class?. > are my mappings correct? > > > Vijay > > > Scott Nichol wrote: > > > A couple of things: > > > > 1. Which line of your code is line 36 where the exception is occurring? > > > > 2. Your code should check for a SOAP Fault before doing > > getReturnValue(), e.g. > > > > Response resp = call.invoke(url, ""); > > if (resp.generatedFault()) { > > Fault fault = resp.getFault(); > > System.err.println("Generated fault: " + fault); > > } else { > > Parameter p = resp.getReturnValue(); > > Hashtable values = (Hashtable)p.getValue(); > > ... > > > > If there is a fault, I believe that getReturnValue() will return null, > > so calling it without checking for a fault could lead to an NPE. > > > > 3. Although I take it you are using Apache SOAP on the server in this > > case, it is worth pointing out that some SOAP implementations will omit > > the return value from the SOAP envelope if its value is null (e.g. this > > happens in .NET when the return is not specified as being nillable). > > Therefore, it is good practice in your client code to check that > > getReturnValue() does not itself return null. > > > > Scott Nichol > > > > ----- Original Message ----- > > From: "Vijay Shinde" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Thursday, January 02, 2003 11:54 AM > > Subject: SOAP - method return > > > > > Hi, > > > > > > I am doing LDAP call using soap .I want to return Hashtable from my > > > method call. > > > On my client site I am using following code to get my hashtable. > > > > > > Response resp = call.invoke(url, ""); > > > Parameter p = resp.getReturnValue(); > > > Hashtable values = (Hashtable)p.getValue(); > > > > > > I am getting following exception. > > > > > > The SOAP Server says: > > > http://localhost:8080/soap/servlet/rpcrouterException in t > > > hread "main" java.lang.NullPointerException > > > at LDAP_client.main(LDAP_client.java:36) > > > > > > any help will be useful. > > > > > > Vijay > > > -- > > > This communication is intended for the addressee(s) and may contain > > > confidential and legally privileged information. 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