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Error during retrieval of test page or composite resource [[ java.lang.NullPointerException ]]

user557016Aug 21 2022

After restarting the WL SOA server, this message is constantly written to the diagnostic log (I masked the composite name):
[2022-08-21T10:42:36.621-04:00] [WLS_SOA1] [ERROR] [] [oracle.integration.platform.blocks.soap] [tid: [ACTIVE].ExecuteThread: '32' for queue: 'weblogic.kernel.Default (self-tuning)'] [userId: <anonymous>] [ecid: 5dfa4d26-dd11-40b5-852b-bb42a21f0872-000074ee,0] [APP: soa-infra] [partition-name: DOMAIN] [tenant-name: GLOBAL] [composite_name: XXXXXXXXXXXXXXXXXXX] Error during retrieval of test page or composite resource[[
. . .
After this, no endpoints for any BPEL composites can be accessed. Trying to access the WSDL of any composite from a browser service shows:
Cannot Test this Web Service using the Test Page
Endpoint Name : FabricProvider (Service Description)
You can test the Web Service using a Java client.
Failed to Load a composite for composite identified by default/XXXXXXXXXXXXXXX*soa_372487a0-4c47-41a2-8749-d1c600bc195e
Please verify that the composite has been properly deployed.

The only workaround we have is to restart the Weblogic SOA servers, but that only fixes the issue for some time, which can go from 15 minutes to several hours.
This problem started after some new BPEL composites were deployed to the cluster. We have redeployed the composite that shows up in the error message, but the problem persists.

Current setup:
SOA Suite Version : in an Enterprise HA Deployment (Clustered)
Oracle Enterprise Linux 7.9
RDBMS is used for the SOA repository.

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Added on Aug 21 2022