com.ibm.mfp.server.security.shared.webtoken.WebTokenException: com.ibm.mfp.server.security.shared.webtoken.WebTokenException: Unsupported credentials type

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com.ibm.mfp.server.security.shared.webtoken.WebTokenException: Unsupported credentials type
com.ibm.mfp.server.security.shared.webtoken.WebTokenException: com.ibm.mfp.server.security.shared.webtoken.WebTokenException: Unsupported credentials type
at com.ibm.mfp.server.security.shared.webtoken.PKICredentials.getRsaPublicKey(PKICredentials.java:120)
at com.ibm.mfp.server.security.shared.webtoken.PKICredentials.createWebKey(PKICredentials.java:96)
at com.ibm.mfp.server.security.shared.webtoken.PKICredentials.createHeader(PKICredentials.java:48)
at com.ibm.mfp.server.security.shared.webtoken.JWS.sign(JWS.java:186)
at com.ibm.mfp.server.az.internal.ConfidentialClientHelper.generateAccessToken(ConfidentialClientHelper.java:94)
at com.ibm.mfp.server.az.internal.token.TokenEndpointImpl.generateTokenResponse(TokenEndpointImpl.java:170)
at com.ibm.mfp.server.az.internal.token.TokenEndpointImpl.serveAuthorizationCodeGrantType(TokenEndpointImpl.java:147)
at com.ibm.mfp.server.az.internal.token.TokenEndpointImpl.getToken(TokenEndpointImpl.java:96)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1285)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:776)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:473)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1104)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:81)
at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost$2.run(DynamicVirtualHost.java:262)
at com.ibm.ws.http.dispatcher.internal.channel.HttpDispatcherLink$TaskWrapper.run(HttpDispatcherLink.java:955)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

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