# Using the REST API Extension and getting "component class is null" on clean install of 2021.\[12\] **URL:** \ **Category:** Q&A\ **Created:** [4 November 2021 16:18 UTC](https://community.ofelia.com/t/using-the-rest-api-extension-and-getting-component-class-is-null-on-clean-install-of-2021-12/10981 "2021-11-04T16:18:41Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![ssp-kevin.toyne](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@ssp-kevin.toyne](https://community.ofelia.com/u/ssp-kevin.toyne)\ **Post date:** [4 November 2021 16:18 UTC](https://community.ofelia.com/t/using-the-rest-api-extension-and-getting-component-class-is-null-on-clean-install-of-2021-12/10981/1 "2021-11-04T16:18:41Z")
Going through the tutorial to deploy a REST API extension: ``` https://documentation.bonitasoft.com/bonita/2021.1/rest-api-extensions ``` On completion, calling the service had no data in the response. Looking to the logs, found the following: ``` INFO (http-nio-8080-exec-1) org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/bonita] RestletServlet: [Restlet] ServerServlet: component class is null ``` Found an already existing question: ``` http://community.ofelia.com/questions-and-answers/restlet-serverservlet-component-class-null ``` but this was from 2015 and referenced JBoss, which I am not using. The initial tests were using Bonita Studio, but also tested on fresh docker deployments of both 2021.1 ("FROM bonita:2021.1") and 2021.2 ("FROM bonita:2021.2"), but getting the same result on all three. Any help would be appreciated. --- OS used is Fedora 33, fully updated. Default installed Java is reporting as: ``` openjdk version "11.0.13" 2021-10-19 OpenJDK Runtime Environment 18.9 (build 11.0.13+8) OpenJDK 64-Bit Server VM 18.9 (build 11.0.13+8, mixed mode, sharing) ``` and inside "BonitaStudioCommunity-2021.1/jre/bin" reporting as: ``` openjdk version "11.0.8" 2020-07-14 OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.8+10) OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.8+10, mixed mode) ``` ---
**Author:** ![ssp-kevin.toyne](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@ssp-kevin.toyne](https://community.ofelia.com/u/ssp-kevin.toyne)\ **Post date:** [15 November 2021 14:27 UTC](https://community.ofelia.com/t/using-the-rest-api-extension-and-getting-component-class-is-null-on-clean-install-of-2021-12/10981/2 "2021-11-15T14:27:31Z")
Remember to login before testing! ---
**Author:** ![romain.bioteau](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ofelia.com/romain.bioteau/32/720_2.png) [@romain.bioteau](https://community.ofelia.com/u/romain.bioteau)\ **Post date:** [8 November 2021 08:36 UTC](https://community.ofelia.com/t/using-the-rest-api-extension-and-getting-component-class-is-null-on-clean-install-of-2021-12/10981/3 "2021-11-08T08:36:00Z")
Hi, As the log is in `INFO` I’m not sure that it explains the cause of your issue. Can you give us more information (logs, request status in the browser dev mode…etc) ? Romain ---
**Author:** ![ssp-kevin.toyne](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@ssp-kevin.toyne](https://community.ofelia.com/u/ssp-kevin.toyne)\ **Post date:** [15 November 2021 14:19 UTC](https://community.ofelia.com/t/using-the-rest-api-extension-and-getting-component-class-is-null-on-clean-install-of-2021-12/10981/4 "2021-11-15T14:19:55Z")
The following is from a fresh start via Bonita Studio, without `INFO` lines: ``` 15-Nov-2021 09:47:08.631 FINE [main] org.jboss.narayana.tomcat.jta.TransactionLifecycleListener.lifecycleEvent Initializing Narayana 15-Nov-2021 09:47:34.787 WARNING [localhost-startStop-1] org.bonitasoft.engine.log.technical.TechnicalLoggerSLF4JImpl.log THREAD_ID=23 | HOSTNAME=myhost | Can't cache the platform, maybe the platform cache service is not started yet: The cache is not started, call start() on the cache service 15-Nov-2021 09:47:34.809 WARNING [localhost-startStop-1] org.bonitasoft.engine.log.technical.TechnicalLoggerSLF4JImpl.log THREAD_ID=23 | HOSTNAME=myhost | Can't cache the platform, maybe the platform cache service is not started yet: The cache is not started, call start() on the cache service Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally. NOT STARTED. Currently in standby mode. Number of jobs executed: 0 Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 5 threads. Using job-store 'org.bonitasoft.engine.scheduler.impl.BonitaJobStoreCMT' - which supports persistence. and is not clustered. Time Tracker 'org.bonitasoft.engine.tracking.TimeTracker': - trackingEnabled: false - flushIntervalInSeconds: 30000 - activatedRecords: EXECUTE_CONNECTOR_INCLUDING_POOL_SUBMIT EXECUTE_CONNECTOR_DISCONNECT EXECUTE_CONNECTOR_CALLABLE EXECUTE_CONNECTOR_OUTPUT_OPERATIONS EXECUTE_CONNECTOR_INPUT_EXPRESSIONS EVALUATE_EXPRESSION EVALUATE_EXPRESSION_INCLUDING_CONTEXT EXECUTE_CONNECTOR_WORK EVALUATE_EXPRESSIONS - flushEventListeners: org.bonitasoft.engine.tracking.memory.MemoryFlushEventListener: active: false No DayRecord registered in memory. org.bonitasoft.engine.tracking.csv.CSVFlushEventListener: active: true outputFolder: /home/bontest/BonitaStudioCommunity-2021.1/workspace/tomcat/server/temp - records.size: 0 - last flush occurrence: Thu Jan 01 01:00:00 GMT 1970 ----- 15-Nov-2021 09:47:40.519 WARNING [Thread-13] org.bonitasoft.console.server.listener.StudioWatchdogListener$1.run Bonita Studio watchdog process has started on port 6969 with a delay set to 20000 ms 15-Nov-2021 09:47:41.872 SEVERE [http-nio-8080-exec-3] org.bonitasoft.engine.business.data.generator.EntityCodeGenerator.determineDbVendor sysprop.bonita.bdm.db.vendor is not set. This should not happen at runtime. Defaulting to h2. ``` When using `curl` to test the API, there are no additional log events, but nothing is returned: ``` $> curl -v "http://localhost:8080/bonita/API/extension/userInformation?p=0&c=10" * Trying ::1:8080... * Connected to localhost (::1) port 8080 (#0) > GET /bonita/API/extension/userInformation?p=0&c=10 HTTP/1.1 > Host: localhost:8080 > User-Agent: curl/7.71.1 > Accept: */* > * Mark bundle as not supporting multiuse < HTTP/1.1 401 < Cache-Control: no-store, no-cache, must-revalidate, proxy-revalidate < Set-Cookie: JSESSIONID=C921180AEC757942B35614ABC3C2B7DC; Path=/; HttpOnly; SameSite=Lax < Content-Length: 0 < Date: Mon, 15 Nov 2021 10:03:18 GMT < * Connection #0 to host localhost left intact ``` I also get the same if I use the following: ``` curl -v "http://localhost:8080/bonita/API/" ``` Or indeed anything stemming from this. Advise if additional info is required. ---
**Author:** ![romain.bioteau](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ofelia.com/romain.bioteau/32/720_2.png) [@romain.bioteau](https://community.ofelia.com/u/romain.bioteau)\ **Post date:** [15 November 2021 12:50 UTC](https://community.ofelia.com/t/using-the-rest-api-extension-and-getting-component-class-is-null-on-clean-install-of-2021-12/10981/5 "2021-11-15T12:50:57Z")
You get a 401 because you need to pass the authentication header in your [curl request](https://documentation.bonitasoft.com/bonita/2021.2/api/rest-api-authentication#_example_using_curl). You might just want to use a web browser a log in to the user app, and then just call the [http://localhost:808/bonita/API/extension/userInformation?p=0&c=10](http://localhost:808/bonita/API/extension/userInformation?p=0&c=10) directly from the browser url. Using dev tools will provide additional information on the request (status, header, response…etc) ---
**Author:** ![ssp-kevin.toyne](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@ssp-kevin.toyne](https://community.ofelia.com/u/ssp-kevin.toyne)\ **Post date:** [15 November 2021 14:26 UTC](https://community.ofelia.com/t/using-the-rest-api-extension-and-getting-component-class-is-null-on-clean-install-of-2021-12/10981/6 "2021-11-15T14:26:40Z")
Whoops. Missed that! Exactly the same in the browser, I was testing without logging in. Once logged in, all good. Thank you for that, much appreciate the assistance leading the blind. Wood for trees and missed that it was returning a `401` ---
**Author:** ![romain.bioteau](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ofelia.com/romain.bioteau/32/720_2.png) [@romain.bioteau](https://community.ofelia.com/u/romain.bioteau)\ **Post date:** [15 November 2021 15:37 UTC](https://community.ofelia.com/t/using-the-rest-api-extension-and-getting-component-class-is-null-on-clean-install-of-2021-12/10981/7 "2021-11-15T15:37:54Z")
Glad it was _just_ that ! Have fun