On 05/06/2023 10:15, netye...@sina.com wrote:
According to Servlet Specification Version 3.1, request.isAsyncStarted() should
return false after calling asyncContext.dispatch().request.isAsyncStarted()
return false in weblogic, but true in tomcat. Is tomcat's action right?
Tomcat is correct. WebLogic is wrong.
The specification states:
<quote>
If any of the dispatch methods are called before the container initiated
dispatch that called startAsync has returned to the container, the
following conditions must hold during that time between the invocation
of dispatch and the return of control to the container:
i. any dispatch invocations invoked during that time will not take
effect until after the container- initiated dispatch has returned to the
container.
ii. any AsyncListener.onComplete(AsyncEvent),
AsyncListener.onTimeout(AsyncEvent) and
AsyncListener.onError(AsyncEvent) invocations will also be delayed until
after the container- initiated dispatch has returned to the container.
iii. any calls to request.isAsyncStarted() must return true until after
the container-initiated dispatch has returned to the container.
</quote>
Point iii is exactly the scenario demonstrated by your sample code.
You should raise a specification compliance bug against WebLogic. You
might also want to inquire how WebLogic managed to pass the Servlet TCK
given that there is a test for this specific behavior.
Mark
Java™ Servlet Specification Version 3.1------------------------------2.3.3.3
Asynchronous processing
ServletRequest
■ public boolean isAsyncStarted() - Returns true if async processing has
started on this request, and false otherwise. If this request has been
dispatched using one of the AsyncContext.dispatch methods since it was put
in asynchronous mode, or a call to AsynContext.complete is made, this
method returns false.
test envirment:------------------------------Tomcat 9.0.55
weblogic 12.2.1.4.0
JDK 1.8.0_261
test code:
------------------------------
import java.io.IOException;
import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(value = "/test", asyncSupported = true)
public class SimpleIssueServlet extends HttpServlet {
private static final long serialVersionUID = -2504425408734161943L;
private static final String CTX_RESULT = "CTX_RESULT";
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
doPost(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
String result = (String) request.getAttribute(CTX_RESULT);
if (result != null) {
response.getWriter().write(result);
return;
}
AsyncContext asyncContext = request.startAsync();
boolean isAsyncStarted01 = request.isAsyncStarted();
System.out.println("isAsyncStarted01:" + isAsyncStarted01);
// tomcat: isAsyncStarted01 = true;
// weblogic: isAsyncStarted01 = true;
{
// make result
String ret = "this is a test";
request.setAttribute(CTX_RESULT, ret);
asyncContext.dispatch();
}
boolean isAsyncStarted02 = request.isAsyncStarted();
System.out.println("isAsyncStarted02:" + isAsyncStarted02);
// tomcat: isAsyncStarted02 = true;
// weblogic: isAsyncStarted02 = false;
}
}
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