Problem:

After a fresh installation of Control Hub, the Admin Tool (http://<host name>:18632/)  does not load properly, as shown in Figure 1 below.  The banner at the top of the page loads, but the remainder of the page does not.  

Note: More information on the Admin Tool can be found at: https://docs.streamsets.com/portal/controlhub/latest/onpremhelp/controlhub/UserGuide/Administration/AdminApp.html#concept_hym_pmr_h1b

Figure 1: Control Hub Admin Tool page improperly loaded

In this event, a warning will also be logged (in dpm.log), which contains the following (along with a stack trace):

2023-03-30 15:41:19,847 :requestId:] eapp:] componentId:] euser:] [thread:adminWebServer-122] WARN  HttpChannel - /rest/v1/system

/components

javax.servlet.ServletException: javax.servlet.ServletException: javax.ws.rs.ProcessingException: URI is not absolute

Cause

This is caused by the endpoint URLs not having been correctly populated in $DPM_CONF/common-to-all-apps.properties during the Control Hub installation.  Examining the properties file will show that while the dpm.base.url property is populated, the endpoints are not, as seen in Example 1 below.

Example 1: Endpoints not configured

# URL used for login

# If proxy is used, should point to outside of proxy

dpm.base.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

 

# Internal app endpoints

dpm.app.messaging.url=

dpm.app.security.url=

dpm.app.timeseries.url=

dpm.app.jobrunner.url=

dpm.app.notification.url=

dpm.app.pipelinestore.url=

dpm.app.policy.url=

dpm.app.provisioning.url=

dpm.app.reporting.url=

dpm.app.scheduler.url=

dpm.app.sdp_classification.url=

dpm.app.topology.url=

dpm.app.sla.url=

dpm.app.dynamic_preview.url=

dpm.app.connection.url=

Solution

1. Using a text editor, edit $DPM_CONF/common-to-all-apps.properties as follows:
   1. ​​​​​​​Copy the URL from the dpm.base.url property (just above the endpoint properties in the file) to each of the endpoint properties, as seen in Example 2 below:
   2. Save the file.

Example 2: Endpoints configured

# URL used for login

# If proxy is used, should point to outside of proxy

dpm.base.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

 

# Internal app endpoints

dpm.app.messaging.url=http://ip-10-10-49-9.us-west-2.compute.internal:1831

dpm.app.security.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.timeseries.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.jobrunner.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.notification.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.pipelinestore.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.policy.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.provisioning.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.reporting.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.scheduler.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.sdp_classification.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.topology.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.sla.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.dynamic_preview.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

dpm.app.connection.url=http://ip-10-10-49-9.us-west-2.compute.internal:18631/

2. If you edited the file as user root, the file will now be owned by root.  Use the chown command to change the ownership back to the correct user.
   1. ​​​​​​​sudo chown <user>:<group> /etc/dpm/common-to-all-apps.properties

3. Shut down Control Hub as described in https://docs.streamsets.com/portal/controlhub/latest/onpremhelp/controlhub/UserGuide/Administration/ShutDownDPM.html#concept_irk_21z_41b

4. Start Control Hub as described in https://docs.streamsets.com/portal/controlhub/latest/onpremhelp/controlhub/UserGuide/Administration/StartControlHub.html

5. After allowing about a little time for Control Hub to start, access the Admin Tool at http://<host name>:18632/admin.html and verify that the page is properly loaded, as shown in Figure 2 below.

Figure 2: Control Hub Admin Tool page, properly loaded