[jetty-dev] [Jetty 9.3.x] java.lang.IllegalStateException: WRITER, when using RedirectRegexRule in jetty.xml

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[jetty-dev] [Jetty 9.3.x] java.lang.IllegalStateException: WRITER, when using RedirectRegexRule in jetty.xml

Neehal Shaikh

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.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283) [184:org.eclipse.jetty.io:9.3.21.v20170918] 
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:108) [184:org.eclipse.jetty.io:9.3.21.v20170918] 
        at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:251) [184:org.eclipse.jetty.io:9.3.21.v20170918] 
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283) [184:org.eclipse.jetty.io:9.3.21.v20170918] 
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:108) [184:org.eclipse.jetty.io:9.3.21.v20170918] 
        at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) [184: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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