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GH-932: [JDBC] Fix memory leak on Connection#close due to unclosed Statement(s) #933

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GH-932: [JDBC] Fix memory leak on Connection#close due to unclosed Statement(s) #933

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3c2c004
Fix memory leak
ennuite Dec 7, 2025
2018ac0
Add test
ennuite Dec 14, 2025
87ee7bf
Refactor ArrowFlightConnection.close()
ennuite Dec 14, 2025
5eb9998
Simplify Connection.close() logic
ennuite Dec 14, 2025
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24 changes: 18 additions & 6 deletions ...light-sql-jdbc-core/src/main/java/org/apache/arrow/driver/jdbc/ArrowFlightConnection.java
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@lidavidm lidavidm Dec 14, 2025

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Yeah, I think it would be great to just build up a single list of AutoCloseables that we can pass to AutoCloseables so that an exception in one doesn't skip the rest, and hopefully that will clean up the logic too.

Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@

import io.netty.util.concurrent.DefaultThreadFactory;
import java.sql.SQLException;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
Expand Down Expand Up @@ -180,19 +181,30 @@ public Properties getClientInfo() {

@Override
public void close() throws SQLException {
clientHandler.close();
if (executorService != null) {
executorService.shutdown();
Exception topLevelException = null;
try {
AutoCloseables.close(List.copyOf(statementMap.values()));
} catch (final Exception e) {
topLevelException = e;
}

try {
AutoCloseables.close(clientHandler);
if (executorService != null) {
executorService.shutdown();
}
allocator.getChildAllocators().forEach(AutoCloseables::closeNoChecked);
AutoCloseables.close(allocator);

super.close();
} catch (final Exception e) {
throw AvaticaConnection.HELPER.createException(e.getMessage(), e);
if (topLevelException == null) {
topLevelException = e;
} else {
topLevelException.addSuppressed(e);
}
}
if (topLevelException != null) {
throw AvaticaConnection.HELPER.createException(
topLevelException.getMessage(), topLevelException);
}
}

Expand Down
38 changes: 38 additions & 0 deletions flight/flight-sql-jdbc-core/src/test/java/org/apache/arrow/driver/jdbc/ConnectionTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
*/
package org.apache.arrow.driver.jdbc;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
Expand All @@ -26,6 +27,7 @@
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import org.apache.arrow.driver.jdbc.authentication.UserPasswordAuthentication;
import org.apache.arrow.driver.jdbc.client.ArrowFlightSqlClientHandler;
Expand Down Expand Up @@ -622,4 +624,40 @@ public void testJdbcDriverVersionIntegration() throws Exception {
"Expected: " + expectedUserAgent + " but found: " + actualUserAgent);
}
}

@Test
public void testStatementsClosedOnConnectionClose() throws Exception {
// create a connection
final Properties properties = new Properties();
properties.put(ArrowFlightConnectionProperty.HOST.camelName(), "localhost");
properties.put(
ArrowFlightConnectionProperty.PORT.camelName(), FLIGHT_SERVER_TEST_EXTENSION.getPort());
properties.put(ArrowFlightConnectionProperty.USER.camelName(), userTest);
properties.put(ArrowFlightConnectionProperty.PASSWORD.camelName(), passTest);
properties.put("useEncryption", false);

Connection connection =
DriverManager.getConnection(
"jdbc:arrow-flight-sql://"
+ FLIGHT_SERVER_TEST_EXTENSION.getHost()
+ ":"
+ FLIGHT_SERVER_TEST_EXTENSION.getPort(),
properties);

// create some statements
int numStatements = 3;
Statement[] statements = new Statement[numStatements];
for (int i = 0; i < numStatements; i++) {
statements[i] = connection.createStatement();
assertFalse(statements[i].isClosed());
}

// close the connection
connection.close();

// assert the statements are closed
for (int i = 0; i < numStatements; i++) {
assertTrue(statements[i].isClosed());
}
}
}
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