Warum ist HttpServletRequest inputstream leer?

Question

Ich habe diesen Code, in dem ich die Eingabe aus einem Anforderungseingangsstrom lese und einen JacksonMapper verwende, um in ein POJO zu konvertieren. Es läuft in einem Jetty 7 Container mit Guice-Unterstützung.

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    try {
        RequestType requestType = mapper.readValue(req.getInputStream(), RequestType.class);
    } Catch(Exception ex) {
        ....
    }
}

Manchmal wird jedoch unter Last die folgende Ausnahme ausgelöst. Ich habe meinen Client überprüft und bin mir sicher, dass er einen gültigen json-String sendet. Was läuft schief? Ist dies das erwartete Verhalten für Jetty 7 unter Last?

java.io.EOFException: No content to map to Object due to end of input
    at org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2433)
    at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2385)
    at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1637)
    at com.ea.wsop.user.LoginServlet.processRequest(LoginServlet.java:69)
    at com.ea.wsop.user.LoginServlet.doPost(LoginServlet.java:63)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd.CGLIB$doPost$0(<generated>)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd$$FastClassByGuice$$c6f479ee.invoke(<generated>)
    at com.google.inject.internal.cglib.proxy.$MethodProxy.invokeSuper(MethodProxy.java:228)
    at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:72)
    at com.ea.monitor.MethodExecutionTimer.invoke(MethodExecutionTimer.java:130)
    at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:72)
    at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:52)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd.doPost(<generated>)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd.CGLIB$service$8(<generated>)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd$$FastClassByGuice$$c6f479ee.invoke(<generated>)
    at com.google.inject.internal.cglib.proxy.$MethodProxy.invokeSuper(MethodProxy.java:228)
    at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:72)
    at com.ea.monitor.MethodExecutionTimer.invoke(MethodExecutionTimer.java:130)
    at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:72)
    at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:52)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd.service(<generated>)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd.CGLIB$service$9(<generated>)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd$$FastClassByGuice$$c6f479ee.invoke(<generated>)
    at com.google.inject.internal.cglib.proxy.$MethodProxy.invokeSuper(MethodProxy.java:228)
    at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:72)
    at com.ea.monitor.MethodExecutionTimer.invoke(MethodExecutionTimer.java:130)
    at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:72)
    at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:52)
    at com.ea.wsop.user.LoginServlet$$EnhancerByGuice$$a91c2ebd.service(<generated>)
    at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)