实现jpetstore物理上分层--续

由于昨天做了一个远程调用架构的项目工程模板demo，虽然大体上可以跑起来了，但有些地方还是有异常。今天决定找出原因。

在办公室的电脑里，我只有spring1.2.9。可能跟之前的spring2.0有点差距，但在spring1.29上也有一点问题。先把这些问题搞定再说。

问题是这样的，登陆的时候老是抛出异常。见如下：

 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() 

 servlet remoting threw exception
com.caucho.hessian.io.HessianProtocolException: expected string at z
    at com.caucho.hessian.io.HessianInput.error(HessianInput.java:

)
    at com.caucho.hessian.io.HessianInput.expect(HessianInput.java:

)
    at com.caucho.hessian.io.HessianInput.readString(HessianInput.java:

)
    at com.caucho.hessian.io.BasicDeserializer.readObject(BasicDeserializer.java:

)
    at com.caucho.hessian.io.HessianInput.readObject(HessianInput.java:

)
    at com.caucho.hessian.server.HessianSkeleton.invoke(HessianSkeleton.java:

)
    at org.springframework.remoting.caucho.HessianServiceExporter.handleRequest(HessianServiceExporter.java:

)
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:

)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:

)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:

)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:

)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:

)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:

)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:

)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:

)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:

)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:

)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:

)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:

)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:

)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:

)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:

)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:

)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:

)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:

)
    at java.lang.Thread.run(Thread.java:

)

 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() 

 servlet petstore threw exception
com.caucho.hessian.io.HessianProtocolException: 
    at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:

)
    at $Proxy0.getAccount(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:

)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:

)
    at java.lang.reflect.Method.invoke(Method.java:

)
    at org.springframework.remoting.caucho.HessianClientInterceptor.invoke(HessianClientInterceptor.java:

)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:

)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:

)
    at $Proxy1.getAccount(Unknown Source)
    at org.springframework.samples.jpetstore.web.spring.OrderFormController.formBackingObject(OrderFormController.java:

)
    at org.springframework.web.servlet.mvc.AbstractFormController.getErrorsForNewForm(AbstractFormController.java:

)
    at org.springframework.web.servlet.mvc.AbstractFormController.showNewForm(AbstractFormController.java:

)
    at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:

)
    at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:

)
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:

)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:

)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:

)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:

)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:

)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:

)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:

)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:

)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:

)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:

)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:

)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:

)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:

)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:

)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:

)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:

)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:

)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:

)
    at java.lang.Thread.run(Thread.java:

)