Hi Joakim,

I tried adding the MovedContextHandler to the server config as below:

<Get name="handler">
  <Call name="addHandler">
   <Arg>
        <New class="org.eclipse.jetty.server.handler.MovedContextHandler">
                <Set name="contextPath">/</Set>
                <Set name="newContextURL">/xyz</Set>
                <Set name="permanent">true</Set>
                <Set name="discardPathInfo">false</Set>
                <Set name="discardQuery">false</Set>
        </New>
   </Arg>
  </Call>
</Get>

I see the context handler taking effect when I start the server.
Started o.e.j.s.h.MovedContextHandler@6216e9d3{/,null,AVAILABLE}

But I don’t see the context getting moved to ‘https://domain/xyz’ when I try to 
hit ‘https://domain/’. I see a warning though.
Can't find the request for https://domain/'s Observer

Regards,
Neehal

From: jetty-users-boun...@eclipse.org <jetty-users-boun...@eclipse.org> On 
Behalf Of Joakim Erdfelt
Sent: Wednesday, May 16, 2018 4:13 PM
To: JETTY user mailing list <jetty-users@eclipse.org>
Subject: Re: [jetty-users] [Jetty 9.3.x] java.lang.IllegalStateException: 
WRITER, when using RedirectRegexRule in jetty.xml

Have you considered MovedContextHandler instead?

https://www.eclipse.org/jetty/documentation/current/moved-context-handler.html

Joakim Erdfelt / joa...@webtide.com<mailto:joa...@webtide.com>

On Wed, May 16, 2018 at 5:03 AM, Neehal Shaikh 
<nsha...@actiance.com<mailto:nsha...@actiance.com>> wrote:
Hi,
I see the below exception when I try to load my application(https://domain/) in 
the browser.

java.lang.IllegalStateException: WRITER
        at org.eclipse.jetty.server.Response.getOutputStream(Response.java:862) 
[192:org.eclipse.jetty.server:9.3.21.v20170918]
        at 
org.eclipse.jetty.rewrite.handler.RedirectRegexRule.apply(RedirectRegexRule.java:99)
 [189:org.eclipse.jetty.rewrite:9.3.21.v20170918]
        at 
org.eclipse.jetty.rewrite.handler.RegexRule.matchAndApply(RegexRule.java:75) 
[189:org.eclipse.jetty.rewrite:9.3.21.v20170918]
        at 
org.eclipse.jetty.rewrite.handler.RuleContainer.apply(RuleContainer.java:169) 
[189:org.eclipse.jetty.rewrite:9.3.21.v20170918]
        at 
org.eclipse.jetty.rewrite.handler.RuleContainer.matchAndApply(RuleContainer.java:149)
 [189:org.eclipse.jetty.rewrite:9.3.21.v20170918]
        at 
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:330)
 [189:org.eclipse.jetty.rewrite:9.3.21.v20170918]
        at 
org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:104)
 [216:org.ops4j.pax.web.pax-web-jetty:6.0.9]
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) 
[192:org.eclipse.jetty.server:9.3.21.v20170918]
        at org.eclipse.jetty.server.Server.handle(Server.java:534) 
[192:org.eclipse.jetty.server:9.3.21.v20170918]
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:333) 
[192:org.eclipse.jetty.server:9.3.21.v20170918]
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) 
[192:org.eclipse.jetty.server:9.3.21.v20170918]
        at 
org.eclipse.jetty.io<http://org.eclipse.jetty.io>.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283)
 [184:org.eclipse.jetty.io:9.3.21.v20170918]
        at 
org.eclipse.jetty.io<http://org.eclipse.jetty.io>.FillInterest.fillable(FillInterest.java:108)
 [184:org.eclipse.jetty.io:9.3.21.v20170918]
        at 
org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:251) 
[184:org.eclipse.jetty.io:9.3.21.v20170918]
        at 
org.eclipse.jetty.io<http://org.eclipse.jetty.io>.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283)
 [184:org.eclipse.jetty.io:9.3.21.v20170918]
        at 
org.eclipse.jetty.io<http://org.eclipse.jetty.io>.FillInterest.fillable(FillInterest.java:108)
 [184:org.eclipse.jetty.io:9.3.21.v20170918]
        at 
org.eclipse.jetty.io<http://org.eclipse.jetty.io>.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
 [184:org.eclipse.jetty.io:9<http://org.eclipse.jetty.io:9>.3.21.v20170918]
        at 
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
 [195:org.eclipse.jetty.util:9.3.21.v20170918]
        at 
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
 [195:org.eclipse.jetty.util:9.3.21.v20170918]
        at 
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
 [195:org.eclipse.jetty.util:9.3.21.v20170918]
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
 [195:org.eclipse.jetty.util:9.3.21.v20170918]
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589) 
[195:org.eclipse.jetty.util:9.3.21.v20170918]
        at java.lang.Thread.run(Thread.java:748) [?:?]



I have my app deployed on a certain path 'https://domain/xyz'.
Now, I have a added a Rule to the RewriteHandler in my jetty.xml, as below: 
which redirects '/' to '/xyz'
<Call name="addRule">
        <Arg>
          <New class="org.eclipse.jetty.rewrite.handler.RedirectRegexRule">
            <Set name="regex">^/$</Set>
            <Set name="location">/xyz</Set>
          </New>
        </Arg>
      </Call>

I see above exception when I try to hit https://domain/

I checked the class org.eclipse.jetty.rewrite.handler.RedirectRegexRule(jetty 
9.3.21),
where the problem is reported at(line number 99).

85     @Override
86        protected String apply(String target, HttpServletRequest request, 
HttpServletResponse response, Matcher matcher)
87                throws IOException
88        {
89            target=_location;
90            for (int g=1;g<=matcher.groupCount();g++)
91            {
92                String group = matcher.group(g);
93                target=target.replaceAll("\\$"+g,group);
94            }
95
96            target = response.encodeRedirectURL(target);
97            
response.setHeader("Location",RedirectUtil.toRedirectURL(request,target));
98            response.setStatus(_statusCode);
99            response.getOutputStream().flush(); // no output / content
100          response.getOutputStream().close();
101          return target;
102      }

Jetty 8.x didn't have this problem because it did the following in the 'apply'
method. It just redirected the response.

@Override
    protected String apply(String target, HttpServletRequest request,
HttpServletResponse response, Matcher matcher)
            throws IOException
    {
        target=_replacement;
        for (int g=1;g<=matcher.groupCount();g++)
        {
            String group = matcher.group(g);
            target=target.replaceAll("\\$"+g,group);
        }

        response.sendRedirect(response.encodeRedirectURL(target));
        return target;
    }


I am using karaf 4.1.5 container with has jetty v9.3.21.

Is there something we could do to fix this one? or get around it?

Regards,
Neehal

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