The story of an Illegal State Exception in Jetty.

Introduction

When I try to receive POST data on Jetty, it looks strange. Let's check.

environment

Jetty embedded

        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-server</artifactId>
            <version>9.4.6.v20170531</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.eclipse.jetty.aggregate/jetty-all-server -->
        <dependency>
            <groupId>org.eclipse.jetty.aggregate</groupId>
            <artifactId>jetty-all-server</artifactId>
            <version>8.2.0.v20160908</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty.orbit</groupId>
            <artifactId>javax.servlet</artifactId>
            <version>3.0.0.v201112011016</version>
        </dependency>

Variables that are already available

Request baseRequest, HttpServletRequest request, HttpServletResponse response

log

p1p2p3p4[Thu Jun 14 00:29:21 JST 2018][LowerLobby]:null
p6p1p2p3java.lang.IllegalStateException: STREAMED
	at org.eclipse.jetty.server.Request.getReader(Request.java:1149)
	at com.haniokasai.mc.SteadyMistress.web.handlers.srvtools.pluginmanager_handler.pluginmanager_handler(pluginmanager_handler.java:59)
	at com.haniokasai.mc.SteadyMistress.web.WebHandler.handle(WebHandler.java:63)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
	at org.eclipse.jetty.server.Server.handle(Server.java:564)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
	at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
	at org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128)
	at org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:199)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:673)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:591)
	at java.lang.Thread.run(Thread.java:748)

solution

What is this guy?

The description was found fairly quickly. ＝＝＞＞http://apache-wicket.1842946.n4.nabble.com/java-lang-IllegalStateException-STREAMED-Consuming-JSON-fails-td3850442.html

This exception says "Don't use the reader but use the input stream because something (maybe header) has been already read from the stream".

This exception says "use the input stream without the reader, because something (probably the header) is already using the stream."

Cheeks, that's right.

In other words, you don't have to use the buffer reader that is already prepared.

BufferedReader in = baseRequest.getReader();

From

BufferedReader in = new BufferedReader( new InputStreamReader(request.getInputStream()));

Just do it! The questioner says!

that's all!