Cannot add a new Subscription Rate Limiting Policy from the Admin Portal

[wasuradananjith]

Description:

When you try to add a new Subscription Rate Limiting Policy from the Admin Portal and error occurs.

Steps to reproduce:

1. Login to the Publisher Portal
2. Create a new Subscription Rate Limiting Policy by entering the details as below.
   
3. You will get an error with the below server logs.

[2020-11-05 08:38:21,653] ERROR - GlobalThrowableMapper An unknown exception has been captured by the global exception mapper.
java.lang.NullPointerException: null
	at org.wso2.carbon.apimgt.rest.api.admin.v1.utils.mappings.throttling.SubscriptionThrottlePolicyMappingUtil.fromSubscriptionThrottlePolicyDTOToModel(SubscriptionThrottlePolicyMappingUtil.java:151) ~[classes/:?]
	at org.wso2.carbon.apimgt.rest.api.admin.v1.impl.ThrottlingApiServiceImpl.throttlingPoliciesSubscriptionPost(ThrottlingApiServiceImpl.java:498) ~[classes/:?]
	at org.wso2.carbon.apimgt.rest.api.admin.v1.ThrottlingApi.throttlingPoliciesSubscriptionPost(ThrottlingApi.java:505) ~[classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_251]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_251]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_251]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_251]
	at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:179) ~[cxf-core-3.3.7.jar:3.3.7]
	at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96) ~[cxf-core-3.3.7.jar:3.3.7]
	at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:201) [cxf-rt-frontend-jaxrs-3.3.7.jar:3.3.7]
	at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:104) [cxf-rt-frontend-jaxrs-3.3.7.jar:3.3.7]
	at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59) [cxf-core-3.3.7.jar:3.3.7]
	at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96) [cxf-core-3.3.7.jar:3.3.7]
	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308) [cxf-core-3.3.7.jar:3.3.7]
	at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121) [cxf-core-3.3.7.jar:3.3.7]
	at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:267) [cxf-rt-transports-http-3.3.7.jar:3.3.7]
	at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234) [cxf-rt-transports-http-3.3.7.jar:3.3.7]
	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208) [cxf-rt-transports-http-3.3.7.jar:3.3.7]
	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160) [cxf-rt-transports-http-3.3.7.jar:3.3.7]
	at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:225) [cxf-rt-transports-http-3.3.7.jar:3.3.7]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:296) [cxf-rt-transports-http-3.3.7.jar:3.3.7]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:215) [cxf-rt-transports-http-3.3.7.jar:3.3.7]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) [tomcat-servlet-api_9.0.34.wso2v1.jar:?]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:271) [cxf-rt-transports-http-3.3.7.jar:3.3.7]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat_9.0.34.wso2v1.jar:?]
	at org.wso2.carbon.identity.context.rewrite.valve.TenantContextRewriteValve.invoke(TenantContextRewriteValve.java:86) [org.wso2.carbon.identity.context.rewrite.valve_1.4.0.jar:?]
	at org.wso2.carbon.identity.authz.valve.AuthorizationValve.invoke(AuthorizationValve.java:110) [org.wso2.carbon.identity.authz.valve_1.4.0.jar:?]
	at org.wso2.carbon.identity.auth.valve.AuthenticationValve.invoke(AuthenticationValve.java:75) [org.wso2.carbon.identity.auth.valve_1.4.0.jar:?]
	at org.wso2.carbon.tomcat.ext.valves.CompositeValve.continueInvocation(CompositeValve.java:99) [org.wso2.carbon.tomcat.ext_4.6.1.beta.jar:?]
	at org.wso2.carbon.tomcat.ext.valves.TomcatValveContainer.invokeValves(TomcatValveContainer.java:49) [org.wso2.carbon.tomcat.ext_4.6.1.beta.jar:?]
	at org.wso2.carbon.tomcat.ext.valves.CompositeValve.invoke(CompositeValve.java:62) [org.wso2.carbon.tomcat.ext_4.6.1.beta.jar:?]
	at org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:145) [org.wso2.carbon.tomcat.ext_4.6.1.beta.jar:?]
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690) [tomcat_9.0.34.wso2v1.jar:?]
	at org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:57) [org.wso2.carbon.tomcat.ext_4.6.1.beta.jar:?]
	at org.wso2.carbon.tomcat.ext.valves.RequestCorrelationIdValve.invoke(RequestCorrelationIdValve.java:126) [org.wso2.carbon.tomcat.ext_4.6.1.beta.jar:?]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) [tomcat_9.0.34.wso2v1.jar:?]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat_9.0.34.wso2v1.jar:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_251]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_251]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat_9.0.34.wso2v1.jar:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_251]

Affected Product Version:

APIM 4.x. (master)

Environment details (with versions):

• OS: Ubuntu 20.04.1 LTS

[Sarangan0219]

This issue is not reproducible in the latest pack (It is fixed). Hence This issue can be closed.