Getting exception serialization error: java.lang. NullPointerException

[bikkie bansal]

Hello All,

I am calling web service using jax rpc call. My web service is returning list type. my code of calling web service is as follow:

   
 
 String targetNamespace = "http://service/";
                            try {
                                /* Service lookup */
                                ServiceFactory serviceFactory = ServiceFactory.newInstance();
                                javax.xml.rpc.Service service = serviceFactory.createService(
                                        new QName(targetNamespace, "CPTandICDServiceService"));
 
                                /* Service access */
                                Call call = service.createCall(new QName("CPTandICDServicePort"));
                                call.setProperty(Call.ENCODINGSTYLE_URI_PROPERTY, "");
 
                                call.setTargetEndpointAddress(
                                        "http://localhost:8080/services_List/CPTandICDServiceService");
 
                                call.setOperationName(new QName(targetNamespace, "getCPTDescriptionFromString"));
                                if (call.isParameterAndReturnSpecRequired(call.getOperationName())) {
                                    call.addParameter(
                                            "strSearch",
                                            new QName("http://www.w3.org/2001/XMLSchema", "string"),
                                            String.class, javax.xml.rpc.ParameterMode.IN);
 
                                    call.setReturnType(new QName("http://www.w3.org/2001/XMLSchema", "anyType"));
 
 

when i am calling web service using

   call.invoke(new Object[] {"h"});  

method i am getting following exception :


serialization error: serialization error: java.lang.NullPointerException
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.getSerializer(DynamicInternalTypeMappingRegistry.java:196)
at com.sun.xml.rpc.encoding.literal.LiteralResponseSerializer.initialize(LiteralResponseSerializer.java:230)
at com.sun.xml.rpc.client.dii.BasicCall.createRpcLiteralResponseSerializer(BasicCall.java:757)
at com.sun.xml.rpc.client.dii.BasicCall.getResponseDeserializer(BasicCall.java:690)
at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:486)
at callbyregistry.CallHISServices.executeQuery(CallHISServices.java:220)
at callbyregistry.CallHISServices.main(CallHISServices.java:45)

CAUSE:

serialization error: java.lang.NullPointerException
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.doSetTargetClass(ValueTypeLiteralSerializer.java:113)
at com.sun.xml.rpc.encoding.literal.GenericLiteralObjectSerializer.setTargetClass(GenericLiteralObjectSerializer.java:117)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.<init>(ValueTypeLiteralSerializer.java:104)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.createLiteralValueTypeSerializer(DynamicInternalTypeMappingRegistry.java:768)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.getSerializer(DynamicInternalTypeMappingRegistry.java:190)
at com.sun.xml.rpc.encoding.literal.LiteralResponseSerializer.initialize(LiteralResponseSerializer.java:230)
at com.sun.xml.rpc.client.dii.BasicCall.createRpcLiteralResponseSerializer(BasicCall.java:757)
at com.sun.xml.rpc.client.dii.BasicCall.getResponseDeserializer(BasicCall.java:690)
at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:486)
at callbyregistry.CallHISServices.executeQuery(CallHISServices.java:220)
at callbyregistry.CallHISServices.main(CallHISServices.java:45)

CAUSE:

java.lang.NullPointerException
at sun.reflect.misc.ReflectUtil.checkPackageAccess(ReflectUtil.java:101)
at sun.reflect.misc.ReflectUtil.isPackageAccessible(ReflectUtil.java:123)
at java.beans.Introspector.getBeanInfo(Introspector.java:154)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.introspectTargetClass(ValueTypeLiteralSerializer.java:120)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.doSetTargetClass(ValueTypeLiteralSerializer.java:110)
at com.sun.xml.rpc.encoding.literal.GenericLiteralObjectSerializer.setTargetClass(GenericLiteralObjectSerializer.java:117)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.<init>(ValueTypeLiteralSerializer.java:104)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.createLiteralValueTypeSerializer(DynamicInternalTypeMappingRegistry.java:768)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.getSerializer(DynamicInternalTypeMappingRegistry.java:190)
at com.sun.xml.rpc.encoding.literal.LiteralResponseSerializer.initialize(LiteralResponseSerializer.java:230)
at com.sun.xml.rpc.client.dii.BasicCall.createRpcLiteralResponseSerializer(BasicCall.java:757)
at com.sun.xml.rpc.client.dii.BasicCall.getResponseDeserializer(BasicCall.java:690)
at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:486)
at callbyregistry.CallHISServices.executeQuery(CallHISServices.java:220)
at callbyregistry.CallHISServices.main(CallHISServices.java:45)

CAUSE:

serialization error: java.lang.NullPointerException
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.doSetTargetClass(ValueTypeLiteralSerializer.java:113)
at com.sun.xml.rpc.encoding.literal.GenericLiteralObjectSerializer.setTargetClass(GenericLiteralObjectSerializer.java:117)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.<init>(ValueTypeLiteralSerializer.java:104)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.createLiteralValueTypeSerializer(DynamicInternalTypeMappingRegistry.java:768)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.getSerializer(DynamicInternalTypeMappingRegistry.java:190)
at com.sun.xml.rpc.encoding.literal.LiteralResponseSerializer.initialize(LiteralResponseSerializer.java:230)
at com.sun.xml.rpc.client.dii.BasicCall.createRpcLiteralResponseSerializer(BasicCall.java:757)
at com.sun.xml.rpc.client.dii.BasicCall.getResponseDeserializer(BasicCall.java:690)
at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:486)
at callbyregistry.CallHISServices.executeQuery(CallHISServices.java:220)
at callbyregistry.CallHISServices.main(CallHISServices.java:45)

CAUSE:

java.lang.NullPointerException
at sun.reflect.misc.ReflectUtil.checkPackageAccess(ReflectUtil.java:101)
at sun.reflect.misc.ReflectUtil.isPackageAccessible(ReflectUtil.java:123)
at java.beans.Introspector.getBeanInfo(Introspector.java:154)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.introspectTargetClass(ValueTypeLiteralSerializer.java:120)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.doSetTargetClass(ValueTypeLiteralSerializer.java:110)
at com.sun.xml.rpc.encoding.literal.GenericLiteralObjectSerializer.setTargetClass(GenericLiteralObjectSerializer.java:117)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.<init>(ValueTypeLiteralSerializer.java:104)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.createLiteralValueTypeSerializer(DynamicInternalTypeMappingRegistry.java:768)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.getSerializer(DynamicInternalTypeMappingRegistry.java:190)
at com.sun.xml.rpc.encoding.literal.LiteralResponseSerializer.initialize(LiteralResponseSerializer.java:230)
at com.sun.xml.rpc.client.dii.BasicCall.createRpcLiteralResponseSerializer(BasicCall.java:757)
at com.sun.xml.rpc.client.dii.BasicCall.getResponseDeserializer(BasicCall.java:690)
at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:486)
at callbyregistry.CallHISServices.executeQuery(CallHISServices.java:220)
at callbyregistry.CallHISServices.main(CallHISServices.java:45)

CAUSE:

java.lang.NullPointerException
at sun.reflect.misc.ReflectUtil.checkPackageAccess(ReflectUtil.java:101)
at sun.reflect.misc.ReflectUtil.isPackageAccessible(ReflectUtil.java:123)
at java.beans.Introspector.getBeanInfo(Introspector.java:154)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.introspectTargetClass(ValueTypeLiteralSerializer.java:120)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.doSetTargetClass(ValueTypeLiteralSerializer.java:110)
at com.sun.xml.rpc.encoding.literal.GenericLiteralObjectSerializer.setTargetClass(GenericLiteralObjectSerializer.java:117)
at com.sun.xml.rpc.encoding.literal.ValueTypeLiteralSerializer.<init>(ValueTypeLiteralSerializer.java:104)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.createLiteralValueTypeSerializer(DynamicInternalTypeMappingRegistry.java:768)
at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.getSerializer(DynamicInternalTypeMappingRegistry.java:190)
at com.sun.xml.rpc.encoding.literal.LiteralResponseSerializer.initialize(LiteralResponseSerializer.java:230)
at com.sun.xml.rpc.client.dii.BasicCall.createRpcLiteralResponseSerializer(BasicCall.java:757)
at com.sun.xml.rpc.client.dii.BasicCall.getResponseDeserializer(BasicCall.java:690)
at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:486)
at callbyregistry.CallHISServices.executeQuery(CallHISServices.java:220)
at callbyregistry.CallHISServices.main(CallHISServices.java:45)


Please help me out.

regards,
vikas
[ December 16, 2008: Message edited by: vikas kumar bansal ]

[Nitin Pathak]

The limitations to Java web services (with Axis) is that the user defined (or complex) objects are not handled - only primitive data types are actually passed . Thus, cannot pass trhough wire without flattening them. If your Java class follows the standard JavBean standard of mutators, you can leverage the services of BeanSerializer (with Axis2).

The simpler method would be to store the references as primitive data types (String values for example) in a HashMap which can be accessed through the client.

                ArbitService service = new ArbitServiceLocator();
Arbit arbit;
try {
arbit = service.getarbit();
HashMap resultMap = arbit.getArbit();
//Iterator itr = null;
                

[ December 16, 2008: Message edited by: Nitin Pathak ]

[Peer Reynders]

Originally posted by Nitin Pathak:
The simpler method would be to store the references as primitive data types (String values for example) in a HashMap which can be accessed through the client.

The choice of a HashMap would prove problematic.

Web Services Programming Tips and Tricks: Use collection types with SOAP
Hashtables in WSDL
Object that contain ArrayList

[bikkie bansal]

Hello Peer,

Thanks for reply.
As describe in tutorial Web Services Programming Tips and Tricks: Use collection types with SOAP

I have created wrapper for my service in which i am converting my list type to string array type.

 String[] strArr = descList.toArray(new String[0]);    

but still I am getting exception when I am invoking my operation.

when I set my return type by using

 call.setReturnType(new QName("http://www.w3.org/2001/XMLSchema", "string"));   

and invoke my operation I got following exception :

 java.lang.ClassCastException: java.lang.String cannot be cast to [Ljava.lang.String;
   

when I set retun type as follow :

 call.setReturnType(new QName("http://www.w3.org/2001/XMLSchema", "anyType"));   

and then invoke operation then I am getting following exception:

 serialization error: serialization error: java.lang.NullPointerException
        at com.sun.xml.rpc.encoding.DynamicInternalTypeMappingRegistry.getSerializer(DynamicInternalTypeMappingRegistry.java:196)
        at com.sun.xml.rpc.encoding.literal.LiteralResponseSerializer.initialize(LiteralResponseSerializer.java:230)
        at com.sun.xml.rpc.client.dii.BasicCall.createRpcLiteralResponseSerializer(BasicCall.java:757)
        at com.sun.xml.rpc.client.dii.BasicCall.getResponseDeserializer(BasicCall.java:690)
        at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:486)
   

please help me.

regards,
vikas
[ December 29, 2008: Message edited by: vikas kumar bansal ]