java - IllegalStateException: null in HttpServlet.service -

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i'm trying send error client when request fails. here's code looks like:

response.senderror(httpservletresponse.sc_bad_request,          "email , username required fields.");

this code throws following error:

java.lang.illegalstateexception: null     @ org.apache.catalina.connector.responsefacade.senderror(responsefacade.java:407) ~[catalina-6.0.26.jar:6.0.26]     @ com.****.****.****.*********servlet.service(********servlet.java:68) ~[********servlet.class:na]     @ javax.servlet.http.httpservlet.service(httpservlet.java:717) ~[javaee-api-5.1.2.jar:5.1.2]     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:290) ~[catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206) ~[catalina-6.0.26.jar:6.0.26]     @ org.red5.logging.loggercontextfilter.dofilter(loggercontextfilter.java:78) ~[red5.jar:na]     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:235) ~[catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:206) ~[catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:233) ~[catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:191) [catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:465) [catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:127) [catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:102) [catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:555) [catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:109) [catalina-6.0.26.jar:6.0.26]     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:298) [catalina-6.0.26.jar:6.0.26]     @ org.apache.coyote.http11.http11processor.process(http11processor.java:852) [tomcat-coyote-6.0.26.jar:6.0.26]     @ org.apache.coyote.http11.http11protocol$http11connectionhandler.process(http11protocol.java:588) [tomcat-coyote-6.0.26.jar:6.0.26]     @ org.apache.tomcat.util.net.jioendpoint$worker.run(jioendpoint.java:489) [tomcat-coyote-6.0.26.jar:6.0.26]

why being thrown here? i'm not doing before call has @ response object, i'm not touching until error sent in if clause. why getting error?

the reason httpservletresponse (implemented responsefacade) throw illegalstateexception response committed before. must have been touched before already.


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