socketTimeout alone in a JDBC URL throws NumberFormatException #196

Goal

A JDBC URL with only socketTimeout throws NumberFormatException from DriverManager. The parser enters the timeout branch but reads the missing connectTimeout parameter.

Where

LibsqlUrlParser lines 96 to 100.

if (queryParams.containsKey("connectTimeout") || queryParams.containsKey("socketTimeout")) {
    connectTimeout = Duration.ofMillis(Long.parseLong(queryParams.get("connectTimeout")));

Long.parseLong(null) throws NumberFormatException, so the caller sees an unchecked exception instead of a SQLException. LibsqlClientConfig has no socket timeout field, so the parameter has nowhere to go today.

Repro

jdbc:libsql:http://localhost:8080/dev/tenant?socketTimeout=5000 through DriverManager.getConnection fails at parse time.

Scope

• Add the failing test first and record the red run.
• Take socketTimeout out of the guard so the parameter is ignored like any other unknown parameter.
• If a socket timeout is wanted, file it as a feature with a field on LibsqlClientConfig. Do not map it onto the connect timeout.

Acceptance

• A test covers socketTimeout alone and fails before the fix.
• After the fix it either connects or fails with SQLException, never NumberFormatException.
• ./mvnw -pl libsql-jdbc -am test green.