jenny1371 opened a new pull request, #6683:
URL: https://github.com/apache/fineract/pull/6683

   With the database down, every request waited for the connection pool timeout 
(20 s)
   and was then answered with a generic HTTP 500. A 500 tells a client that the 
request
   itself failed; a 503 with Retry-After tells it that the service is 
temporarily
   unavailable and the request can be retried.
   
   Map DataAccessResourceFailureException (which includes 
CannotGetJdbcConnectionException,
   read requests) and CannotCreateTransactionException (write requests) to HTTP 
503 with a
   Retry-After header and the error code error.msg.database.unavailable.
   
   Tests: both mappers answer 503 with Retry-After and a JSON body.
   
   The exception mappers added in the previous commit are not reached when the 
database is down,
   because the first database access of a request is in 
TenantAwareBasicAuthenticationFilter
   (loading the tenant), which runs before the JAX-RS layer. The exception 
escaped the filter and
   the container answered HTTP 500 after the 20 s connection pool timeout.
   
   Catch DataAccessResourceFailureException and 
CannotCreateTransactionException in the filter and
   answer 503 with Retry-After: 5.
   
   Tests: both exceptions while loading the tenant give 503 with Retry-After, 
and the filter chain is not called.
   
   
   ## Description
   
   Describe the changes made and why they were made. (Ignore if these details 
are present on the associated Apache Fineract JIRA ticket.)
   
   ## Checklist
   
   Please make sure these boxes are checked before submitting your pull request 
- thanks!
   
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