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import org.apache.kafka.clients.admin.AdminClient;
import org.apache.kafka.clients.admin.AdminClientConfig;
import org.apache.kafka.clients.admin.DescribeClusterResult;
import org.apache.kafka.clients.admin.ListTopicsResult;
import java.util.Properties;
import java.util.concurrent.TimeUnit;
public class JavaAdminClientTest {
public static void main(String[] args) {
// Set uncaught exception handler to catch AdminClient thread errors
Thread.setDefaultUncaughtExceptionHandler((t, e) -> {
System.err.println("UNCAUGHT EXCEPTION in thread " + t.getName() + ":");
e.printStackTrace();
});
String bootstrapServers = args.length > 0 ? args[0] : "localhost:9093";
System.out.println("Testing Kafka wire protocol with broker: " + bootstrapServers);
Properties props = new Properties();
props.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
props.put(AdminClientConfig.REQUEST_TIMEOUT_MS_CONFIG, 10000);
props.put(AdminClientConfig.DEFAULT_API_TIMEOUT_MS_CONFIG, 10000);
props.put(AdminClientConfig.CLIENT_ID_CONFIG, "java-admin-test");
props.put(AdminClientConfig.CONNECTIONS_MAX_IDLE_MS_CONFIG, 120000);
props.put(AdminClientConfig.SOCKET_CONNECTION_SETUP_TIMEOUT_MS_CONFIG, 10000);
props.put(AdminClientConfig.SOCKET_CONNECTION_SETUP_TIMEOUT_MAX_MS_CONFIG, 30000);
props.put(AdminClientConfig.SECURITY_PROTOCOL_CONFIG, "PLAINTEXT");
props.put(AdminClientConfig.RECONNECT_BACKOFF_MS_CONFIG, 50);
props.put(AdminClientConfig.RECONNECT_BACKOFF_MAX_MS_CONFIG, 1000);
System.out.println("Creating AdminClient with config:");
props.forEach((k, v) -> System.out.println(" " + k + " = " + v));
try (AdminClient adminClient = AdminClient.create(props)) {
System.out.println("AdminClient created successfully");
Thread.sleep(2000); // Give it time to initialize
// Test 1: Describe Cluster (uses Metadata API internally)
System.out.println("\n=== Test 1: Describe Cluster ===");
try {
DescribeClusterResult clusterResult = adminClient.describeCluster();
String clusterId = clusterResult.clusterId().get(10, TimeUnit.SECONDS);
int nodeCount = clusterResult.nodes().get(10, TimeUnit.SECONDS).size();
System.out.println("Cluster ID: " + clusterId);
System.out.println("Nodes: " + nodeCount);
} catch (Exception e) {
System.err.println("Describe Cluster failed: " + e.getMessage());
e.printStackTrace();
}
// Test 2: List Topics
System.out.println("\n=== Test 2: List Topics ===");
try {
ListTopicsResult topicsResult = adminClient.listTopics();
int topicCount = topicsResult.names().get(10, TimeUnit.SECONDS).size();
System.out.println("Topics: " + topicCount);
} catch (Exception e) {
System.err.println("List Topics failed: " + e.getMessage());
e.printStackTrace();
}
System.out.println("\nAll tests completed!");
} catch (Exception e) {
System.err.println("AdminClient creation failed: " + e.getMessage());
e.printStackTrace();
System.exit(1);
}
}
}
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