Cannot invoke method

I am using Flex 1.5 and spring 3.1 and hibernate 3
I have UserService class implementing UserDetailsService, I have loadUserByUsername method overridden.
Also there is other public method in this class but my flex client/message broker is unable to see this method.

for testing purpose, if I have the same class with out implementing UserDetailsService( I have not configured security, during the testing), then flex can invoke that method.

error I am getting is

Code:

Oct 6, 2012 1:00:36 AM org.springframework.flex.core.DefaultExceptionLogger log WARNING: The following exception occurred during request processing by the BlazeDS MessageBroker and will be serialized back to the client: flex.messaging.MessageException: Cannot invoke method 'getMenu'. Method 'getMenu' not found. at flex.messaging.util.MethodMatcher.methodNotFound(MethodMatcher.java:387) at flex.messaging.util.MethodMatcher.getMethod(MethodMatcher.java:172) at flex.messaging.services.remoting.adapters.JavaAdapter.invoke(JavaAdapter.java:417) at flex.messaging.services.RemotingService.serviceMessage(RemotingService.java:183) at flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:1400) at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:1005) at flex.messaging.endpoints.AbstractEndpoint$$FastClassByCGLIB$$1a3ef066.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.flex.core.MessageInterceptionAdvice.invoke(MessageInterceptionAdvice.java:66) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$FixedChainStaticTargetInterceptor.intercept(Cglib2AopProxy.java:573) at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$122d4591.serviceMessage(<generated>) at flex.messaging.endpoints.amf.MessageBrokerFilter.invoke(MessageBrokerFilter.java:103) at flex.messaging.endpoints.amf.LegacyFilter.invoke(LegacyFilter.java:158) at flex.messaging.endpoints.amf.SessionFilter.invoke(SessionFilter.java:44) at flex.messaging.endpoints.amf.BatchProcessFilter.invoke(BatchProcessFilter.java:67) at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:166) at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:291) at flex.messaging.endpoints.AMFEndpoint$$EnhancerByCGLIB$$122d4591.service(<generated>) at org.springframework.flex.servlet.MessageBrokerHandlerAdapter.handle(MessageBrokerHandlerAdapter.java:109) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) 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:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 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:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929) 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:1002) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 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:662)

my application config

Code:

<flex:message-broker> <flex:remoting-service default-channels="my-amf" /> </flex:message-broker> <tx:annotation-driven /> <context:property-placeholder location="classpath:db.properties" /> <context:component-scan base-package="org.hmil.sam"></context:component-scan> <bean id="samDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${sam.jdbc.driverClassName}" /> <property name="url" value="${sam.jdbc.url}" /> <property name="username" value="${sam.jdbc.username}" /> <property name="password" value="${sam.jdbc.password}" /> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="samDataSource" /> <property name="packagesToScan" value="org.hmil.sam" /> <property name="hibernateProperties"> <value> hibernate.format_sql=${hibernate.format_sql} hibernate.show_sql=${hibernate.show_sql} hibernate.dialect=${hibernate.dialect} </value> </property> </bean>  <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean>

Any help is appreciated