fix(postgres): run JDBC readiness gate after wait strategy

[bunnysayzz]

Fixes #11981.

Root cause: PostgreSQLContainer.waitUntilContainerStarted overrode the JdbcDatabaseContainer version and ran only getWaitStrategy().waitUntilReady, skipping the host-side JDBC loop (real connection + SELECT 1). The default log-output strategy fires on the ready log line, which can precede mapped-port reachability on Docker Desktop/Colima, so the first connect got Connection refused.

Fix: run the strategy first, then super.waitUntilContainerStarted(). A user-supplied waitingFor(...) is still honored, and the port is proven reachable before start returns.

Verified: :testcontainers-postgresql:compileJava green. The Docker-gated module suite needs a daemon (none on this machine), leaving it to CI; happy to add a connect-immediately regression test if maintainers want one.

Summary by CodeRabbit

• Bug Fixes
  • PostgreSQL containers now verify host connectivity and execute a readiness query after log-based startup checks, improving reliability before tests begin.

[coderabbitai]

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• modules/postgresql/src/main/java/org/testcontainers/containers/PostgreSQLContainer.java

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📝 Walkthrough

Walkthrough

Both PostgreSQL container classes now run the configured wait strategy and then perform the inherited JDBC readiness check during startup.

Changes

PostgreSQL readiness

Layer / File(s)	Summary
Combined startup readiness checks modules/postgresql/src/main/java/org/testcontainers/postgresql/PostgreSQLContainer.java, modules/postgresql/src/main/java/org/testcontainers/containers/PostgreSQLContainer.java	waitUntilContainerStarted() retains the configured wait strategy and then invokes the inherited JDBC readiness check.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: eddumelendez

Merge Risk: ⚪ Minimal · up to 28f53

Both PostgreSQL container implementations now preserve configured wait strategies and perform JDBC readiness checks before startup completes.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the primary change: restoring the JDBC readiness gate after the configured PostgreSQL wait strategy.
Description check	✅ Passed	The description identifies issue #11981, explains the root cause, describes the fix, confirms that custom wait strategies remain supported, and records verification and test limitations.
Linked Issues check	✅ Passed	The two PostgreSQL container implementations now run the configured wait strategy and then JdbcDatabaseContainer's inherited JDBC readiness check. The check validates host-side connectivity with `SE…
Out of Scope Changes check	✅ Passed	The changes are limited to the two PostgreSQL container implementations named in [#11981]. Both changes add the requested JDBC readiness delegation. No unrelated change is identified.

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Actionable comments posted: 1

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Inline comments:
In
`@modules/postgresql/src/main/java/org/testcontainers/postgresql/PostgreSQLContainer.java`:
- Around line 139-150: Update the deprecated
PostgreSQLContainer.waitUntilContainerStarted() override to call
super.waitUntilContainerStarted() after getWaitStrategy().waitUntilReady(this),
preserving the existing wait-strategy execution and adding the inherited JDBC
readiness check before start() returns.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 79146399-9ffe-4207-9185-2fbe3d2d1e16

📥 Commits

Reviewing files that changed from the base of the PR and between 8e54951 and 07065c0.

📒 Files selected for processing (1)

• modules/postgresql/src/main/java/org/testcontainers/postgresql/PostgreSQLContainer.java

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

[bunnysayzz]

Good catch on the deprecated container, it had the same strategy-only override. Applied the same gate there too (28f53f4). Compile clean on the postgresql module; Docker-gated suite still left to CI since there is no daemon here.