fix: honour ojp.connection.pool.* properties passed via DriverManager.getConnection() info argument

[Copilot]

Pool configuration keys set in the Properties argument to DriverManager.getConnection(url, info) were silently dropped — the driver read pool settings exclusively from ojp.properties / system properties / env vars, making programmatic overrides (e.g. dynamically computed maximumPoolSize) impossible.

Changes

• DatasourcePropertiesLoader — new applyInfoProperties(base, info, datasourceName) method that filters ojp.connection.pool.* and ojp.xa.* keys from info and merges them on top of the already-resolved base with the highest precedence. Non-OJP keys (user, password, database-specific params) are deliberately ignored.

• Driver.connect() — calls applyInfoProperties immediately after loading from file/system/env.

• DatasourcePropertiesLoaderInfoPropertiesTest — 13 new unit tests covering: null/empty guards, info-only (no file present), info overrides base, XA properties, credential key filtering, and mixed scenarios.

• Docs — ojp-jdbc-configuration.md and part2-chapter5-jdbc-configuration.md: added programmatic configuration section with the four-level priority table; corrected the ebook property reference table (wrong bare names and stale defaults).

Priority order after fix

Priority	Source
1 (highest)	Properties passed to getConnection()
2	Environment variables
3	System properties (-D)
4	ojp.properties file

Usage

Properties info = new Properties();
info.setProperty("user", "alice");
info.setProperty("password", "secret");
// Overrides any value in ojp.properties / env / system props
info.setProperty("ojp.connection.pool.maximumPoolSize", String.valueOf(allocatedMaxConnections));
info.setProperty("ojp.connection.pool.minimumIdle", "3");

Connection conn = DriverManager.getConnection(
    "jdbc:ojp[ojp-server:1059]_postgresql://db:5432/mydb", info);

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Maintainability Rating on New Code (required ≥ A)

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