DWR2调用load(Class objClass, Serializable id)报错

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DWR2调用load(Class objClass, Serializable id)报错5

public Object load(Class objClass, Serializable id);
public Office load3(Serializable id);//测试用
public Office load4(Class cls);//测试用
分别调用:

    OfficeService.load('com.company.system.po.Office','2c9081031b2ef7fa011b2ef9fb8a0004',callback_load) ;
    OfficeService.load3('2c9081031b2ef7fa011b2ef9fb8a0004',callback_load) ;
    OfficeService.load4('com.company.system.po.Office',callback_load) ;

分别报错:

1.
BaseCallMarshaller:59 - --Erroring: batchId[0] message[java.lang.IllegalArgumentException: Missing method or missing parameter converters: OfficeService.load]

2.
Erroring: batchId[0] message[java.lang.IllegalArgumentException: Missing method or missing parameter converters: OfficeService.load3]

3.
org.directwebremoting.extend.MarshallException: Error marshalling java.lang.Class: Error reading bean. Input parameter probably is not an object. (Missing: {). See the logs for more details.
at org.directwebremoting.convert.BasicObjectConverter.convertInbound(BasicObjectConverter.java:65)
at org.directwebremoting.dwrp.DefaultConverterManager.convertInbound(DefaultConverterManager.java:159)
at org.directwebremoting.dwrp.BaseCallMarshaller.marshallInbound(BaseCallMarshaller.java:155)
at org.directwebremoting.servlet.PlainCallHandler.handle(PlainCallHandler.java:44)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Thread.java:595)
19:06:08,187 WARN BaseCallMarshaller:59 - --Erroring: batchId[0] message[org.directwebremoting.extend.MarshallException: Error marshalling java.lang.Class: Error reading bean. Input parameter probably is not an object. (Missing: {). See the logs for more details.]

开始想自定义converter,对于java.lang.Class的转换可以自定义Converter,可以处理,但是Serializable 好像无法处理,抽象类型....
各位高手是如何处理的?

DWR