fix: try to make itests work

Fixes #874

view/jpa/src/test/resources/application-itest.yaml

@@ -6,7 +6,11 @@ spring:
     generate-ddl: true
     hibernate.ddl-auto: create-drop
   datasource:
-    url: jdbc:h2:mem:testdb;MODE=PostgreSQL;INIT=create schema if not exists PUBLIC;DB_CLOSE_DELAY=-1;NON_KEYWORDS=VALUE;DB_CLOSE_ON_EXIT=FALSE
+    # Explanation for the `random.uuid`: Spring caches application contexts for tests (see https://docs.spring.io/spring-framework/reference/testing/testcontext-framework/ctx-management/caching.html).
+    # If each context uses the same database, we can get a situation where context A is initialized, then context B is initialized and shut down, then context A is reused. But the
+    # shutdown of context B has destroyed (dropped the schema of) the shared database, so the second test using context A will find the database in an unexpected state and fails.
+    # Adding a random identifier to the database name ensures that each context gets its own database that it can initialize and tear down according to its own lifecycle.
+    url: jdbc:h2:mem:testdb-${random.uuid};MODE=PostgreSQL;INIT=create schema if not exists PUBLIC;DB_CLOSE_DELAY=-1;NON_KEYWORDS=VALUE
     username: sa
     password: sa
     hikari: