Fix JDBC driver CI test failures: encoding and Testcontainers

Note: The PR was created with the help of AI tools and a human.

Fix two root causes of CI test failures reproduced in ubuntu:24.04
container with Zulu Java 17 + Gradle 9.3.1 (matching GitHub Actions):

build.gradle.kts: Set javac encoding to UTF-8 to prevent Unicode test
failures (e.g. Greek Omega) when the CI runner locale defaults to
US-ASCII. Without this, source characters are garbled at compile time,
causing deterministic assertion failures in AgtypeFactoryTest and
AgtypeUtilTest.

BaseDockerizedTest.java: Fix Testcontainers setup reliability -
- Add Wait.forLogMessage wait strategy with 60s timeout so PostgreSQL
  is fully ready before JDBC connection attempt
- Use getHost() instead of hardcoded "localhost" for correct behavior
  in Docker-in-Docker and varied CI environments
- Add sslmode=disable to JDBC URL since PostgreSQL driver 42.6.0+
  attempts SSL negotiation by default and the AGE Docker image has no
  SSL configured
- Remove silent catch/println that swallowed connection errors and
  produced misleading NullPointerExceptions downstream

Verified: 77/77 tests pass across multiple consecutive runs.

modified:   drivers/jdbc/lib/build.gradle.kts
modified:   drivers/jdbc/lib/src/test/java/org/apache/age/jdbc/BaseDockerizedTest.java

Author: jrgemignani

drivers/jdbc/lib/build.gradle.kts

@@ -45,6 +45,10 @@ dependencies {
     testImplementation("org.slf4j:slf4j-simple:2.0.7")
 }
 
+tasks.withType<JavaCompile> {
+    options.encoding = "UTF-8"
+}
+
 tasks.generateGrammarSource {
     maxHeapSize = "64m"
     source = project.objects

drivers/jdbc/lib/src/test/java/org/apache/age/jdbc/BaseDockerizedTest.java

@@ -21,13 +21,15 @@
 
 import java.sql.DriverManager;
 import java.sql.Statement;
+import java.time.Duration;
 import org.apache.age.jdbc.base.Agtype;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.TestInstance;
 import org.junit.jupiter.api.TestInstance.Lifecycle;
 import org.postgresql.jdbc.PgConnection;
 import org.testcontainers.containers.GenericContainer;
+import org.testcontainers.containers.wait.strategy.Wait;
 import org.testcontainers.utility.DockerImageName;
 
 @TestInstance(Lifecycle.PER_CLASS)
@@ -54,20 +56,19 @@ public void beforeAll() throws Exception {
         agensGraphContainer = new GenericContainer<>(DockerImageName
             .parse("apache/age:dev_snapshot_master"))
             .withEnv("POSTGRES_PASSWORD", CORRECT_DB_PASSWORDS)
-            .withExposedPorts(5432);
+            .withExposedPorts(5432)
+            .waitingFor(Wait.forLogMessage(".*database system is ready to accept connections.*\\n", 2)
+                .withStartupTimeout(Duration.ofSeconds(60)));
         agensGraphContainer.start();
 
+        String host = agensGraphContainer.getHost();
         int mappedPort = agensGraphContainer.getMappedPort(5432);
         String jdbcUrl = String
-            .format("jdbc:postgresql://%s:%d/%s", "localhost", mappedPort, "postgres");
+            .format("jdbc:postgresql://%s:%d/%s?sslmode=disable", host, mappedPort, "postgres");
 
-        try {
-            this.connection = DriverManager.getConnection(jdbcUrl, "postgres", CORRECT_DB_PASSWORDS)
-                         .unwrap(PgConnection.class);
-            this.connection.addDataType("agtype", Agtype.class);
-        } catch (Exception e) {
-            System.out.println(e);
-        }
+        this.connection = DriverManager.getConnection(jdbcUrl, "postgres", CORRECT_DB_PASSWORDS)
+                     .unwrap(PgConnection.class);
+        this.connection.addDataType("agtype", Agtype.class);
         try (Statement statement = connection.createStatement()) {
             statement.execute("CREATE EXTENSION IF NOT EXISTS age;");
             statement.execute("LOAD 'age'");