Spring 4 REST application using Java configuration (no xml) IllegalArgumentException -


this question has answer here:

this driving me crazy. i've done bit of spring coding first time i'm trying configuration in java. i've searched on stackoverflow , other places, , while others have seen problem, none of solutions have worked me.

here source files:

initializer:

public class enhancedcandidateinfoinitializer extends  abstractannotationconfigdispatcherservletinitializer {     private static final logger logger = loggerfactory.getlogger(enhancedcandidateinfoinitializer.class);      @override     protected class<?>[] getrootconfigclasses() {         logger.info("@@@@@ getrootconfigclasses called - returning null @@@@@");         return null;     }      @override     protected class<?>[] getservletconfigclasses() {         logger.info("@@@@@ getservletconfigclasses called returning enhancedcandidateinfowebconfiguration.class @@@@@");         return new class[] { enhancedcandidateinfowebconfiguration.class    };     }      @override     protected string[] getservletmappings() {         logger.info("@@@@@ getservletmappings called @@@@@");         return new string[] { "/" };     } }

webmvcconfiguration:

@configuration @enablewebmvc @componentscan(basepackages = {"com.mojorank.restapi"}) public class enhancedcandidateinfowebconfiguration extends webmvcconfigureradapter {     private static final logger logger =  loggerfactory.getlogger(enhancedcandidateinfowebconfiguration.class);     @override     public void configuredefaultservlethandling(defaultservlethandlerconfigurer configurer) {         logger.info("#### configuration handler called ####");         configurer.enable();     } }

controller:

@restcontroller public class enhancecandidateinfocontroller {     @requestmapping("/")     public string welcome() {//welcome page, non-rest         return "welcome resttemplate example.";     }      @requestmapping("/hello/{player}")     public message message(@pathvariable string player) {//rest endpoint.          message msg = new message(player, "hello " + player);         return msg;     } }

when build , deploy application tomcat, following exception stack trace:

caused by: java.lang.illegalargumentexception: failed register servlet name 'dispatcher'.check if there servlet registered under same name. @ org.springframework.util.assert.notnull(assert.java:115) @ org.springframework.web.servlet.support.abstractdispatcherservletinitializer.registerdispatcherservlet(abstractdispatcherservletinitializer.java:98) @ org.springframework.web.servlet.support.abstractdispatcherservletinitializer.onstartup(abstractdispatcherservletinitializer.java:71) @ org.springframework.web.springservletcontainerinitializer.onstartup(springservletcontainerinitializer.java:169) @ org.apache.catalina.core.standardcontext.startinternal(standardcontext.java:5274) @ org.apache.catalina.util.lifecyclebase.start(lifecyclebase.java:150)

as said, i've searched through stackoverflow , other places , found others had same problem, when tried implement proposed fixes, problem remained. in advance help.

change webmvcconfiguration method this:

public class enhancedcandidateinfowebconfiguration extends webmvcconfigureradapter {              @override                     public void configureviewresolvers(viewresolverregistry registry) {             internalresourceviewresolver ivr=new internalresourceviewresolver();             ivr.setprefix("/web-inf/jsp/");             ivr.setsuffix(".jsp");             ivr.setexposecontextbeansasattributes(true);             registry.viewresolver(ivr);         }     }

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