Can't update API with publisher REST API v1

[praminda]

Description:

Server responds with 500 error message when trying to use api/am/publisher/v1.0/apis/{apiId} endpoint. This happens only when using basic auth for authentication, works fine when using OAuth token.

Response:

{"code":500,"message":"Internal server error","description":"The server encountered an internal error. Please contact administrator.","moreInfo":"","error":[]} 

Logs:

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String;
	at org.wso2.carbon.apimgt.rest.api.publisher.v1.impl.ApisApiServiceImpl.apisApiIdPut(ApisApiServiceImpl.java:550) ~[classes/:?]
	at org.wso2.carbon.apimgt.rest.api.publisher.v1.ApisApi.apisApiIdPut(ApisApi.java:583) ~[classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_221]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_221]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_221]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_221]
	at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:179) ~[cxf-core-3.2.8.jar:3.2.8]
	at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96) ~[cxf-core-3.2.8.jar:3.2.8]
	at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:193) [cxf-rt-frontend-jaxrs-3.2.8.jar:3.2.8]
	at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:103) [cxf-rt-frontend-jaxrs-3.2.8.jar:3.2.8]
	at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59) [cxf-core-3.2.8.jar:3.2.8]
	at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96) [cxf-core-3.2.8.jar:3.2.8]
	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308) [cxf-core-3.2.8.jar:3.2.8]
	at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121) [cxf-core-3.2.8.jar:3.2.8]
	at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:267) [cxf-rt-transports-http-3.2.8.jar:3.2.8]
	at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234) [cxf-rt-transports-http-3.2.8.jar:3.2.8]
	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208) [cxf-rt-transports-http-3.2.8.jar:3.2.8]
	at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160) [cxf-rt-transports-http-3.2.8.jar:3.2.8]
	at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:216) [cxf-rt-transports-http-3.2.8.jar:3.2.8]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:301) [cxf-rt-transports-http-3.2.8.jar:3.2.8]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPut(AbstractHTTPServlet.java:237) [cxf-rt-transports-http-3.2.8.jar:3.2.8]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:663) [tomcat-servlet-api_9.0.22.wso2v1.jar:?]
	at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:276) [cxf-rt-transports-http-3.2.8.jar:3.2.8]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat_9.0.22.wso2v1.jar:?]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat_9.0.22.wso2v1.jar:?]
	at org.wso2.carbon.identity.context.rewrite.valve.TenantContextRewriteValve.invoke(TenantContextRewriteValve.java:80) [org.wso2.carbon.identity.context.rewrite.valve_1.3.6.jar:?]

Steps to reproduce:

1. Create API
2. Use api/am/publisher/v1.0/apis/{apiId} with basic auth to update the API.
3. Observe the response

Affected Product Version:

3.0.0
3.1.0

Environment details (with versions):

• OS:
• Client:
• Env (Docker/K8s):