How to Guide For Newbies: A possible reason for getting ERROR - APIUtil Error occurred while executing SubscriberKeyMgtClient. java.lang.RuntimeException: Error occurred while calling token endpoint: HTTP error code : 302 in WSO2 API manager.

Intension is this blog post to helping out to trouble shoot below error [1] on your own.

A possible cause can be:

'oauth2.war' web application located in /repository/deployment/server/webapps folder is not deployed.

[1] Error Stack Trace

[2017-05-08 11:39:22,161] ERROR - APIUtil Error occurred while executing SubscriberKeyMgtClient.

java.lang.RuntimeException: Error occurred while calling token endpoint: HTTP error code : 302

at org.wso2.carbon.apimgt.impl.AMDefaultKeyManagerImpl.getNewApplicationAccessToken(AMDefaultKeyManagerImpl.java:367)

at org.wso2.carbon.apimgt.impl.workflow.AbstractApplicationRegistrationWorkflowExecutor.dogenerateKeysForApplication(AbstractApplicationRegistrationWorkflowExecutor.java:151)

at org.wso2.carbon.apimgt.impl.workflow.AbstractApplicationRegistrationWorkflowExecutor.generateKeysForApplication(AbstractApplicationRegistrationWorkflowExecutor.java:118)

at org.wso2.carbon.apimgt.impl.workflow.ApplicationRegistrationSimpleWorkflowExecutor.complete(ApplicationRegistrationSimpleWorkflowExecutor.java:78)

at org.wso2.carbon.apimgt.impl.workflow.ApplicationRegistrationSimpleWorkflowExecutor.execute(ApplicationRegistrationSimpleWorkflowExecutor.java:54)

at org.wso2.carbon.apimgt.impl.APIConsumerImpl.requestApprovalForApplicationRegistration(APIConsumerImpl.java:2789)

at org.wso2.carbon.apimgt.impl.UserAwareAPIConsumer.requestApprovalForApplicationRegistration(UserAwareAPIConsumer.java:36)

at org.wso2.carbon.apimgt.hostobjects.APIStoreHostObject.jsFunction_getApplicationKey(APIStoreHostObject.java:385)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:126)

at org.mozilla.javascript.FunctionObject.call(FunctionObject.java:386)

at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:52)

at org.jaggeryjs.rhino.store.modules.subscription.c2._c_anonymous_2(/store/modules/subscription/key.jag:39)

at org.jaggeryjs.rhino.store.modules.subscription.c2.call(/store/modules/subscription/key.jag)

at org.mozilla.javascript.ScriptRuntime.applyOrCall(ScriptRuntime.java:2430)

at org.mozilla.javascript.BaseFunction.execIdCall(BaseFunction.java:269)

at org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:97)

at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:42)

at org.jaggeryjs.rhino.store.modules.subscription.c0._c_anonymous_10(/store/modules/subscription/module.jag:35)

at org.jaggeryjs.rhino.store.modules.subscription.c0.call(/store/modules/subscription/module.jag)

at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:52)

at org.jaggeryjs.rhino.store.site.blocks.subscription.subscription_add.ajax.c0._c_anonymous_1(/store/site/blocks/subscription/subscription-add/ajax/subscription-add.jag:240)

at org.jaggeryjs.rhino.store.site.blocks.subscription.subscription_add.ajax.c0.call(/store/site/blocks/subscription/subscription-add/ajax/subscription-add.jag)

at org.mozilla.javascript.optimizer.OptRuntime.call0(OptRuntime.java:23)

at org.jaggeryjs.rhino.store.site.blocks.subscription.subscription_add.ajax.c0._c_script_0(/store/site/blocks/subscription/subscription-add/ajax/subscription-add.jag:3)

at org.jaggeryjs.rhino.store.site.blocks.subscription.subscription_add.ajax.c0.call(/store/site/blocks/subscription/subscription-add/ajax/subscription-add.jag)

at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:394)

at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3091)

at org.jaggeryjs.rhino.store.site.blocks.subscription.subscription_add.ajax.c0.call(/store/site/blocks/subscription/subscription-add/ajax/subscription-add.jag)

at org.jaggeryjs.rhino.store.site.blocks.subscription.subscription_add.ajax.c0.exec(/store/site/blocks/subscription/subscription-add/ajax/subscription-add.jag)

at org.jaggeryjs.scriptengine.engine.RhinoEngine.execScript(RhinoEngine.java:567)

at org.jaggeryjs.scriptengine.engine.RhinoEngine.exec(RhinoEngine.java:273)

at org.jaggeryjs.jaggery.core.manager.WebAppManager.exec(WebAppManager.java:588)

at org.jaggeryjs.jaggery.core.manager.WebAppManager.execute(WebAppManager.java:508)

at org.jaggeryjs.jaggery.core.JaggeryServlet.doPost(JaggeryServlet.java:29)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:747)

at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:485)

at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:377)

at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:337)

at org.jaggeryjs.jaggery.core.JaggeryFilter.doFilter(JaggeryFilter.java:21)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.wso2.carbon.ui.filters.cache.ContentTypeBasedCachePreventionFilter.doFilter(ContentTypeBasedCachePreventionFilter.java:53)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.filters.HttpHeaderSecurityFilter.doFilter(HttpHeaderSecurityFilter.java:120)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

at org.wso2.carbon.tomcat.ext.valves.CompositeValve.continueInvocation(CompositeValve.java:99)

at org.wso2.carbon.tomcat.ext.valves.CarbonTomcatValve$1.invoke(CarbonTomcatValve.java:47)

at org.wso2.carbon.webapp.mgt.TenantLazyLoaderValve.invoke(TenantLazyLoaderValve.java:57)

at org.wso2.carbon.event.receiver.core.internal.tenantmgt.TenantLazyLoaderValve.invoke(TenantLazyLoaderValve.java:48)

at org.wso2.carbon.tomcat.ext.valves.TomcatValveContainer.invokeValves(TomcatValveContainer.java:47)

at org.wso2.carbon.tomcat.ext.valves.CompositeValve.invoke(CompositeValve.java:62)

at org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:159)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:958)

at org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:57)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1756)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1715)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:745)

[2017-05-08 11:39:22,168] ERROR - ApplicationRegistrationSimpleWorkflowExecutor Error occurred when updating the status of the Application creation process

org.wso2.carbon.apimgt.api.APIManagementException: Error occurred while executing SubscriberKeyMgtClient.

at org.wso2.carbon.apimgt.impl.utils.APIUtil.handleException(APIUtil.java:1269)

at org.wso2.carbon.apimgt.impl.workflow.AbstractApplicationRegistrationWorkflowExecutor.dogenerateKeysForApplication(AbstractApplicationRegistrationWorkflowExecutor.java:155)