Greeting,
I want to implement a simple client-server application with the following
feature: client receives some remote object and call it's method. I don't have
an intention to use EJBs so my question if this possible with pure Spring
Remoting features like Hessian.
The remote object that is being passed is
Code:
import interfaces.IUser;
public class UserImpl implements IUser
{
public String getAge() {
return " 27 y.o ";
}
public String getName()
{
return " John Doe ";
}
public String getSex()
{
return " M ";
}
public String getUserString() {
return getName() + getAge() + getSex();
}
}
The client side has only IUser in its classpath, not UserImpl. So when I call
Hessian Service, I receive en error like this
Code:
java.lang.InstantiationException: interfaces.IUser
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at
com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:172)
at
com.caucho.hessian.io.JavaDeserializer.readMap(JavaDeserializer.java:112)
at com.caucho.hessian.io.HessianInput.readObject(HessianInput.java:662)
at com.caucho.hessian.io.HessianInput.readReply(HessianInput.java:241)
at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:179)
at $Proxy0.getUser(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.springframework.remoting.caucho.HessianClientInterceptor.invoke(HessianClientInterceptor.java:163)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176)
at
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:210)
at $Proxy1.getUser(Unknown Source)
at client.Client.callService(Client.java:39)
at client.Client.main(Client.java:56)
I haven't looked at Hessian source code, but I could presume that it tries to
instantiate UserImpl on the client side, where such class is absent in the
classpath.
Can I configure Hessian somehow to send UserImpl class information with
serialized UserImpl object?
Thanks in advance!
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