ModelDriven and several objects

I have an action that implements ModelDriven interface and has several objects within it which attributes are displayed at JSP page. Everything is nice, but there's a problem with set method. For the object that is returned through getModel method set method is working. For the rest of the objects it isn't. I got the following exection:

ERROR [InstantiatingNullHandler] Could not create and/or set value back on to object
java.lang.NullPointerException
	at ognl.OgnlRuntime$ClassCache.get(OgnlRuntime.java:144)
	at ognl.OgnlRuntime.getDeclaredMethods(OgnlRuntime.java:1188)
	at ognl.OgnlRuntime.getSetMethod(OgnlRuntime.java:1270)
	at ognl.OgnlRuntime.hasSetMethod(OgnlRuntime.java:1291)
	at ognl.OgnlRuntime.hasSetProperty(OgnlRuntime.java:1307)
	at com.opensymphony.xwork.util.OgnlUtil.getRealTarget(OgnlUtil.java:158)
	at com.opensymphony.xwork.util.InstantiatingNullHandler.nullPropertyValue(InstantiatingNullHandler.java:87)
	at ognl.ASTProperty.getValueBody(ASTProperty.java:98)
	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)
	at ognl.SimpleNode.getValue(SimpleNode.java:210)
	at ognl.ASTChain.setValueBody(ASTChain.java:168)
	at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:177)
	at ognl.SimpleNode.setValue(SimpleNode.java:246)
	at ognl.Ognl.setValue(Ognl.java:476)
	at com.opensymphony.xwork.util.OgnlUtil.setValue(OgnlUtil.java:184)
	at com.opensymphony.xwork.util.OgnlValueStack.setValue(OgnlValueStack.java:146)
	at com.opensymphony.xwork.util.OgnlValueStack.setValue(OgnlValueStack.java:129)
	at com.opensymphony.xwork.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:136)
	at com.opensymphony.xwork.interceptor.ParametersInterceptor.before(ParametersInterceptor.java:111)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:32)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:136)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:32)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:32)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:146)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:32)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:32)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:32)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:94)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:32)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:180)
	at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:113)
	at com.opensymphony.webwork.dispatcher.DispatcherUtils.serviceAction(DispatcherUtils.java:202)
	at com.opensymphony.webwork.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:184)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:132)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at com.achievehealthcare.matrix.core.filter.SecurityFilter.doFilter(SecurityFilter.java:175)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at com.achievehealthcare.matrix.core.filter.CacheValveFilter.doFilter(CacheValveFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at com.achievehealthcare.matrix.core.filter.LogFilter.doFilter(LogFilter.java:44)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:61)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:66)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:158)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
	at java.lang.Thread.run(Thread.java:595)

Any ideas?
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