java - How to avoid illegal state exception? -

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every time "405 method not allowed" response server, want redirect user given url. however, keep getting illegalstateexceptions saying response has committed. there way can redirect user without getting exception?

i have following servlet:

public class methodnotallowedhandler extends httpservlet {       @override     protected void doget(httpservletrequest req, httpservletresponse resp)                       throws servletexception, ioexception {         resp.sendredirect("http://www.google.com");     } }

and following entry in web.xml:

<servlet>     <servlet-name>methodnotallowedhandler</servlet-name>     <servlet-class>com.ex.methodnotallowedhandler</servlet-class> </servlet> <servlet-mapping>     <servlet-name>methodnotallowedhandler</servlet-name>     <url-pattern>/methodnotallowedhandler</url-pattern> </servlet-mapping> <error-page>     <error-code>405</error-code>     <location>/methodnotallowedhandler</location> </error-page>

thanks

edit: meant add stack trace:

09:01:33,326 error [[methodnotallowedhandler]] servlet.service() servlet methodnotallowedhandler threw exception java.lang.illegalstateexception @ org.apache.catalina.connector.responsefacade.sendredirect(responsefacade.java:435) @ com.ex.methodnotallowedhandler.doget(methodnotallowedhandler.java:26) @ javax.servlet.http.httpservlet.service(httpservlet.java:690) @ javax.servlet.http.httpservlet.service(httpservlet.java:803) @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:290) @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206) @ org.apache.catalina.core.applicationdispatcher.invoke(applicationdispatcher.java:654) @ org.apache.catalina.core.applicationdispatcher.processrequest(applicationdispatcher.java:447) @ org.apache.catalina.core.applicationdispatcher.doforward(applicationdispatcher.java:379) @ org.apache.catalina.core.applicationdispatcher.forward(applicationdispatcher.java:292) @ org.apache.catalina.core.standardhostvalve.custom(standardhostvalve.java:423) @ org.apache.catalina.core.standardhostvalve.status(standardhostvalve.java:342) @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:143) @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:102) @ org.jboss.web.tomcat.service.jca.cachedconnectionvalve.invoke(cachedconnectionvalve.java:157) @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:109) @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:262) @ org.apache.coyote.http11.http11processor.process(http11processor.java:844) @ org.apache.coyote.http11.http11protocol$http11connectionhandler.process(http11protocol.java:583) @ org.apache.tomcat.util.net.jioendpoint$worker.run(jioendpoint.java:446) @ java.lang.thread.run(thread.java:619)

i got work, , think know why-- seems 405 exception occurring more once, 2nd time handler catches it, response committed. fixed problem:

@override protected void doget(httpservletrequest req, httpservletresponse resp) throws              servletexception, ioexception {     if (!resp.iscommitted()) {         resp.sendredirect("http://www.google.com");     } else {         log.info("    response committed!");     }     return; }

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