ARROW-17785: [Java][FlightSQL] Add comprehensive tests for CloseSession error suppression

Add unit and integration tests for the error suppression functionality
in ArrowFlightSqlClientHandler:

- ArrowFlightSqlClientHandlerTest: 18 unit tests covering error detection,
  logging, and exception handling logic using Mockito and reflection
- ArrowFlightSqlClientHandlerIntegrationTest: 4 integration tests with
  real FlightServer to validate error suppression in realistic scenarios

Tests verify that benign gRPC shutdown errors (UNAVAILABLE and INTERNAL
with GOAWAY) are properly suppressed while genuine failures are correctly
propagated as exceptions.

Author: Vando Pereira

flight/flight-sql-jdbc-core/src/test/java/org/apache/arrow/driver/jdbc/client/ArrowFlightSqlClientHandlerIntegrationTest.java

@@ -0,0 +1,219 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.arrow.driver.jdbc.client;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.read.ListAppender;
+import java.sql.SQLException;
+import java.util.concurrent.atomic.AtomicBoolean;
+import org.apache.arrow.driver.jdbc.FlightServerTestExtension;
+import org.apache.arrow.flight.CallStatus;
+import org.apache.arrow.flight.CloseSessionRequest;
+import org.apache.arrow.flight.CloseSessionResult;
+import org.apache.arrow.flight.FlightProducer.CallContext;
+import org.apache.arrow.flight.FlightProducer.StreamListener;
+import org.apache.arrow.flight.FlightRuntimeException;
+import org.apache.arrow.flight.sql.NoOpFlightSqlProducer;
+import org.apache.arrow.memory.BufferAllocator;
+import org.apache.arrow.memory.RootAllocator;
+import org.apache.arrow.util.AutoCloseables;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+import org.slf4j.LoggerFactory;
+
+/** Integration tests for {@link ArrowFlightSqlClientHandler} error suppression functionality. */
+public class ArrowFlightSqlClientHandlerIntegrationTest {
+
+  /** Custom producer that can simulate various error conditions during close operations. */
+  public static class ErrorSimulatingFlightSqlProducer extends NoOpFlightSqlProducer {
+    
+    private final AtomicBoolean simulateUnavailableOnClose = new AtomicBoolean(false);
+    private final AtomicBoolean simulateGoAwayOnClose = new AtomicBoolean(false);
+    private final AtomicBoolean simulateNonBenignOnClose = new AtomicBoolean(false);
+
+    public void setSimulateUnavailableOnClose(boolean simulate) {
+      simulateUnavailableOnClose.set(simulate);
+    }
+
+    public void setSimulateGoAwayOnClose(boolean simulate) {
+      simulateGoAwayOnClose.set(simulate);
+    }
+
+    public void setSimulateNonBenignOnClose(boolean simulate) {
+      simulateNonBenignOnClose.set(simulate);
+    }
+
+    @Override
+    public void closeSession(CloseSessionRequest request, CallContext context, StreamListener<CloseSessionResult> listener) {
+      if (simulateUnavailableOnClose.get()) {
+        listener.onError(CallStatus.UNAVAILABLE.withDescription("Service unavailable during shutdown").toRuntimeException());
+        return;
+      }
+
+      if (simulateGoAwayOnClose.get()) {
+        listener.onError(CallStatus.INTERNAL.withDescription("Connection closed after GOAWAY").toRuntimeException());
+        return;
+      }
+
+      if (simulateNonBenignOnClose.get()) {
+        listener.onError(CallStatus.UNAUTHENTICATED.withDescription("Authentication failed").toRuntimeException());
+        return;
+      }
+
+      // Normal successful close - just complete successfully
+      listener.onCompleted();
+    }
+  }
+
+  private static final ErrorSimulatingFlightSqlProducer PRODUCER = new ErrorSimulatingFlightSqlProducer();
+
+  @RegisterExtension
+  public static final FlightServerTestExtension FLIGHT_SERVER_TEST_EXTENSION =
+      FlightServerTestExtension.createStandardTestExtension(PRODUCER);
+
+  private static BufferAllocator allocator;
+  private Logger logger;
+  private ListAppender<ILoggingEvent> logAppender;
+
+  @BeforeAll
+  public static void setup() {
+    allocator = new RootAllocator(Long.MAX_VALUE);
+  }
+
+  @AfterAll
+  public static void tearDown() throws Exception {
+    AutoCloseables.close(PRODUCER, allocator);
+  }
+
+  @BeforeEach
+  public void setUp() {
+    // Set up logging capture
+    logger = (Logger) LoggerFactory.getLogger(ArrowFlightSqlClientHandler.class);
+    logAppender = new ListAppender<>();
+    logAppender.start();
+    logger.addAppender(logAppender);
+    logger.setLevel(Level.DEBUG);
+
+    // Reset producer state
+    PRODUCER.setSimulateUnavailableOnClose(false);
+    PRODUCER.setSimulateGoAwayOnClose(false);
+    PRODUCER.setSimulateNonBenignOnClose(false);
+  }
+
+  @AfterEach
+  public void tearDownLogging() {
+    if (logger != null && logAppender != null) {
+      logger.detachAppender(logAppender);
+    }
+  }
+
+  @Test
+  public void testClose_WithCatalog_UnavailableError_SuppressesException() throws Exception {
+    // Arrange
+    PRODUCER.setSimulateUnavailableOnClose(true);
+    
+    try (ArrowFlightSqlClientHandler client = new ArrowFlightSqlClientHandler.Builder()
+        .withHost(FLIGHT_SERVER_TEST_EXTENSION.getHost())
+        .withPort(FLIGHT_SERVER_TEST_EXTENSION.getPort())
+        .withBufferAllocator(allocator)
+        .withEncryption(false)
+        .withCatalog("test-catalog") // This triggers CloseSession RPC
+        .build()) {
+
+      // Act & Assert - close() should not throw despite server error
+      assertDoesNotThrow(() -> client.close());
+    }
+    
+    // Verify error was logged as suppressed
+    assertTrue(logAppender.list.stream()
+        .anyMatch(event -> event.getFormattedMessage().contains("closing Flight SQL session")));
+  }
+
+  @Test
+  public void testClose_WithCatalog_GoAwayError_SuppressesException() throws Exception {
+    // Arrange
+    PRODUCER.setSimulateGoAwayOnClose(true);
+    
+    try (ArrowFlightSqlClientHandler client = new ArrowFlightSqlClientHandler.Builder()
+        .withHost(FLIGHT_SERVER_TEST_EXTENSION.getHost())
+        .withPort(FLIGHT_SERVER_TEST_EXTENSION.getPort())
+        .withBufferAllocator(allocator)
+        .withEncryption(false)
+        .withCatalog("test-catalog")
+        .build()) {
+      
+      // Act & Assert
+      assertDoesNotThrow(() -> client.close());
+    }
+    
+    // Verify error was logged as suppressed
+    assertTrue(logAppender.list.stream()
+        .anyMatch(event -> event.getFormattedMessage().contains("closing Flight SQL session")));
+  }
+
+  @Test
+  public void testClose_WithCatalog_NonBenignError_ThrowsSQLException() throws Exception {
+    // Arrange
+    PRODUCER.setSimulateNonBenignOnClose(true);
+    
+    ArrowFlightSqlClientHandler client = new ArrowFlightSqlClientHandler.Builder()
+        .withHost(FLIGHT_SERVER_TEST_EXTENSION.getHost())
+        .withPort(FLIGHT_SERVER_TEST_EXTENSION.getPort())
+        .withBufferAllocator(allocator)
+        .withEncryption(false)
+        .withCatalog("test-catalog")
+        .build();
+    
+    // Act & Assert - non-benign errors should be thrown
+    SQLException thrown = assertThrows(SQLException.class, () -> client.close());
+    assertTrue(thrown.getMessage().contains("Failed to close Flight SQL session"));
+    assertTrue(thrown.getCause() instanceof FlightRuntimeException);
+  }
+
+  @Test
+  public void testClose_WithoutCatalog_NoCloseSessionCall() throws Exception {
+    // Arrange - no catalog means no CloseSession RPC
+    PRODUCER.setSimulateUnavailableOnClose(true); // This won't be triggered
+    
+    try (ArrowFlightSqlClientHandler client = new ArrowFlightSqlClientHandler.Builder()
+        .withHost(FLIGHT_SERVER_TEST_EXTENSION.getHost())
+        .withPort(FLIGHT_SERVER_TEST_EXTENSION.getPort())
+        .withBufferAllocator(allocator)
+        .withEncryption(false)
+        // No catalog set
+        .build()) {
+      
+      // Act & Assert - should close successfully without any CloseSession RPC
+      assertDoesNotThrow(() -> client.close());
+    }
+    
+    // Verify no CloseSession-related logging occurred
+    assertTrue(logAppender.list.stream()
+        .noneMatch(event -> event.getFormattedMessage().contains("closing Flight SQL session")));
+  }
+}