Spring 3.0.6 + Hessian 4.0.7 + strange errors
Hi Guys,
I'm currently working on a project which allows a non-spring client to transfer data to and from a Tomcat/Spring Server.
I decided to use Hessian because it sounded quite neat but it creates crazy exceptions which I do not understand.
So first i show some of my code
So i use
Spring 3.0.6
Tomcat 7
Hessian 4.0.7
Client:
Code:
HessianProxyFactory factory = new HessianProxyFactory();
IConnector basic = (IConnector) factory.create(IConnector.class, "http://localhost:8080/HessianTest/remoting/RemoteService");
basic.getData2(new long[]{1,2});
basic.getData(new long[]{1,2});
Server:
web.xml
Code:
<web-app>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>WEB-INF/beans.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<servlet>
<servlet-name>remoting</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>remoting</servlet-name>
<url-pattern>/remoting/*</url-pattern>
</servlet-mapping>
</web-app>
remoting.xml
Code:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<bean name="/RemoteService"
class="org.springframework.remoting.caucho.HessianServiceExporter">
<property name="service" ref="Connector" />
<property name="serviceInterface" value="xxx.IConnector" />
</bean>
</beans>
The code of the Connector is very simple. It just calls a dao with to deal with the data
Code:
int getData(long[] data);
int getData2(long[] data);
So now the Exception I keep getting:
Client:
Code:
Exception in thread "main" com.caucho.hessian.client.HessianRuntimeException: com.caucho.hessian.io.HessianProtocolException: '?' is an unknown code
at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:221)
at $Proxy0.getDatasetHeader(Unknown Source)
at de.rusch.client.Main.main(Main.java:45)
Caused by: com.caucho.hessian.io.HessianProtocolException: '?' is an unknown code
at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:219)
... 2 more
Server:
Code:
Feb 15, 2012 5:38:08 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [remoting] in context with path [/HessianTest] threw exception [Hessian skeleton invocation failed; nested exception is java.lang.UnsupportedOperationException: com.caucho.hessian.io.BasicDeserializer@31987298] with root cause
java.lang.UnsupportedOperationException: com.caucho.hessian.io.BasicDeserializer@31987298
at com.caucho.hessian.io.BasicDeserializer.readList(BasicDeserializer.java:512)
at com.caucho.hessian.io.HessianInput.readObject(HessianInput.java:1052)
at com.caucho.hessian.server.HessianSkeleton.invoke(HessianSkeleton.java:300)
at com.caucho.hessian.server.HessianSkeleton.invoke(HessianSkeleton.java:221)
at org.springframework.remoting.caucho.HessianExporter.doInvoke(HessianExporter.java:198)
at org.springframework.remoting.caucho.HessianExporter.invoke(HessianExporter.java:118)
at org.springframework.remoting.caucho.HessianServiceExporter.handleRequest(HessianServiceExporter.java:66)
at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:49)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:585)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
The strange thing about this error is that I get it when using getData but not when using getData2.
I tried playing a bit with the HessianFactory in the client and setting Hessian2Reply and Hessian2Request to true with the effect that a long[] was translated into a String[] (There is another method getData(String[] data)) or I got some of the "long expected 0xd java.lang.String".
So from what I see from the BasicDeserializer source the Exception is thrown because readList checks with a switch if the datatype is readable or otherwise throws this exception. And during debugging i saw that Hessian does not see a long[] as datatype but a simple String.
I guess this is a problem with me using Hessian in a wrong way and can be solved very easy :-).
Can u please also help me to make Hessian2 work on my Service.
Best and thx a lot
hajoru
(Sorry for the repost. Accidently postet the same thread into web services and have no idea how to change the folder)
