jFinal的renderJson使用gson的JsonObject或JsonA?报错

@JFinal 你好，想跟你请教个问题：

jFinal的renderJson使用gson的JsonObject或JsonArray对象会报错

java.lang.RuntimeException
	at com.jfinal.kit.JsonKit.beanToJson(JsonKit.java:255)
	at com.jfinal.kit.JsonKit.otherToJson(JsonKit.java:237)
	at com.jfinal.kit.JsonKit.toJson(JsonKit.java:205)
	at com.jfinal.render.JsonRender.<init>(JsonRender.java:84)
	at com.jfinal.render.RenderFactory.getJsonRender(RenderFactory.java:159)
	at com.jfinal.core.Controller.renderJson(Controller.java:901)
	at zyl.justaa.site.controller.UserController.list(UserController.java:105)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.jfinal.core.ActionInvocation.invoke(ActionInvocation.java:55)
	at zyl.justaa.site.interceptor.GlobalInterceptor.intercept(GlobalInterceptor.java:11)
	at com.jfinal.core.ActionInvocation.invoke(ActionInvocation.java:51)
	at com.jfinal.core.ActionHandler.handle(ActionHandler.java:73)
	at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	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:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
	at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.jfinal.kit.JsonKit.beanToJson(JsonKit.java:252)
	... 31 more
Caused by: java.lang.IllegalStateException
	at com.google.gson.JsonArray.getAsString(JsonArray.java:133)
	... 36 more