为什么客户端调用抛出java.lang.NullPointerException异常？
我用axis即时发布了一个简单的webservice，代码是：
public class CalcService {
public int add(int p1, int p2) {
return p1 + p2;
}
public int subtract(int p1, int p2) {
return p1 - p2;
}
}
输入http://localhost:8080/axis/CalcService.jws?WSDL后能正常看见内容：
<?xml version= "1.0 " encoding= "UTF-8 " ?>
- <wsdl:definitions targetNamespace= "http://localhost:8080/axis/CalcService.jws " xmlns= "http://schemas.xmlsoap.org/wsdl/ " xmlns:apachesoap= "http://xml.apache.org/xml-soap " xmlns:impl= "http://localhost:8080/axis/CalcService.jws " xmlns:intf= "http://localhost:8080/axis/CalcService.jws " xmlns:soapenc= "http://schemas.xmlsoap.org/soap/encoding/ " xmlns:wsdl= "http://schemas.xmlsoap.org/wsdl/ " xmlns:wsdlsoap= "http://schemas.xmlsoap.org/wsdl/soap/ " xmlns:xsd= "http://www.w3.org/2001/XMLSchema ">
- <wsdl:message name= "subtractResponse ">
<wsdl:part name= "subtractReturn " type= "xsd:int " />
</wsdl:message>
- <wsdl:message name= "subtractRequest ">
<wsdl:part name= "p1 " type= "xsd:int " />
<wsdl:part name= "p2 " type= "xsd:int " />
</wsdl:message>
- <wsdl:message name= "addRequest ">
<wsdl:part name= "p1 " type= "xsd:int " />
<wsdl:part name= "p2 " type= "xsd:int " />
</wsdl:message>
- <wsdl:message name= "addResponse ">
<wsdl:part name= "addReturn " type= "xsd:int " />
</wsdl:message>
- <wsdl:portType name= "CalcService ">
- <wsdl:operation name= "add " parameterOrder= "p1 p2 ">
<wsdl:input message= "impl:addRequest " name= "addRequest " />
<wsdl:output message= "impl:addResponse " name= "addResponse " />
</wsdl:operation>
- <wsdl:operation name= "subtract " parameterOrder= "p1 p2 ">
<wsdl:input message= "impl:subtractRequest " name= "subtractRequest " />
<wsdl:output message= "impl:subtractResponse " name= "subtractResponse " />
</wsdl:operation>
</wsdl:portType>
- <wsdl:binding name= "CalcServiceSoapBinding " type= "impl:CalcService ">
<wsdlsoap:binding style= "rpc " transport= "http://schemas.xmlsoap.org/soap/http " />
- <wsdl:operation name= "add ">
<wsdlsoap:operation soapAction= " " />
- <wsdl:input name= "addRequest ">
<wsdlsoap:body encodingStyle= "http://schemas.xmlsoap.org/soap/encoding/ " namespace= "http://localhost:8080/axis/CalcService.jws " use= "encoded " />
</wsdl:input>
- <wsdl:output name= "addResponse ">
<wsdlsoap:body encodingStyle= "http://schemas.xmlsoap.org/soap/encoding/ " namespace= "http://localhost:8080/axis/CalcService.jws " use= "encoded " />
</wsdl:output>
</wsdl:operation>
- <wsdl:operation name= "subtract ">
<wsdlsoap:operation soapAction= " " />
- <wsdl:input name= "subtractRequest ">
<wsdlsoap:body encodingStyle= "http://schemas.xmlsoap.org/soap/encoding/ " namespace= "http://localhost:8080/axis/CalcService.jws " use= "encoded " />
</wsdl:input>
- <wsdl:output name= "subtractResponse ">
<wsdlsoap:body encodingStyle= "http://schemas.xmlsoap.org/soap/encoding/ " namespace= "http://localhost:8080/axis/CalcService.jws " use= "encoded " />
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
- <wsdl:service name= "CalcServiceService ">
- <wsdl:port binding= "impl:CalcServiceSoapBinding " name= "CalcService ">
<wsdlsoap:address location= "http://localhost:8080/axis/CalcService.jws " />
</wsdl:port>
</wsdl:service>
</wsdl:definitions>
但是我在客户端调用时，执行到invoke时就抛出NullPointerException异常，不能调用，我的客户端程序是：
import java.util.Vector;
import org.apache.axis.client.Call;
import org.apache.axis.client.Service;
import org.apache.axis.encoding.XMLType;
import org.apache.soap.rpc.Response;
import javax.xml.rpc.ParameterMode;
public class TestClient {
public static void main(String [] args) {
try{
String endpoint = "http://localhost:8080/axis/CalcService.jws ";
Service service = new Service();
Call call = (Call)service.createCall();
call.setTargetEndpointAddress( new java.net.URL(endpoint) );
int i=1;
int j=9;
call.setOperationName( "add " );
call.addParameter( "p1 ",XMLType.XSD_INT,ParameterMode.IN);
call.addParameter( "p2 ",XMLType.XSD_INT,ParameterMode.IN);
call.setReturnType( XMLType.XSD_INT);
Object object = ( call.invoke( new Object[] {i,j} ));
} catch(Exception e){
System.err.println(e.toString());
}
}
}
小弟跪求高手指点。
------解决方案--------------------
空指针大多是你想传的参数没传到而引起的
包这个错的时候应该有提示你在哪一行上出了错
你好好的检查一下那几行
还有以后不要发这么长的代码,别人看了也会烦的
[解决办法]
我也想知道
