java GAE抛出非法状态异常:WRITER
我有一个GAE+Java+Spring应用程序,带有非常简单的控制器:
@RequestMapping(value = ['/_warmup', '/_ah/warmup'])
@ResponseBody
String warmup() {
return 'OK'
}
它只返回字符串,当我从浏览器调用这个url时,我会毫无问题地得到它
顺便说一句,当它部署在GAE上,并且被GAE调用时,我在日志中看到以下异常:
java.lang.IllegalStateException: WRITER
at org.mortbay.jetty.Response.getOutputStream(Response.java:594)
at javax.servlet.ServletResponseWrapper.getOutputStream(ServletResponseWrapper.java:102)
at org.springframework.http.server.ServletServerHttpResponse.getBody(ServletServerHttpResponse.java:64)
at org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:99)
at org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:1)
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:181)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.writeWithMessageConverters(AnnotationMethodHandlerAdapter.java:975)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.handleResponseBody(AnnotationMethodHandlerAdapter.java:933)
正如我所见,我使用了相同的消息转换器,但总是得到非法的Jetty状态。有人有同样的问题吗
PS当我试图在生产服务器上从浏览器打开这个url时,它也能工作。只有当GAE调用此url(cron或warmup请求)时,才会发生这种情况
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