Protect JMS connection creation against prepareConnection errors

This commit uses a local variable for the creation of a new JMS
Connection so that a rare failure in prepareConnection(...) does not
leave the connection field in a partially initialized state.

If such a JMSException occurs, the intermediary connection is closed.
This commit further defends against close() failures at that point,
by logging the close exception at DEBUG level. As a result, the original
JMSException is always re-thrown.

Closes gh-29116
See gh-29115

spring-jms/src/main/java/org/springframework/jms/connection/SingleConnectionFactory.java

@@ -346,8 +346,26 @@ public class SingleConnectionFactory implements ConnectionFactory, QueueConnecti
 			if (this.connection != null) {
 				closeConnection(this.connection);
 			}
-			this.connection = doCreateConnection();
-			prepareConnection(this.connection);
+			// Create new (method local) connection, which is later assigned to instance connection
+			//  - prevention to hold instance connection without exception listener, in case when
+			//    some subsequent methods (after creation of connection) throws JMSException
+			Connection con = doCreateConnection();
+			try {
+				prepareConnection(con);
+				this.connection = con;
+			}
+			catch (JMSException ex) {
+				// Attempt to close new (not used) connection to release possible resources
+				try {
+					con.close();
+				}
+				catch(Throwable th) {
+					if (logger.isDebugEnabled()) {
+						logger.debug("Could not close newly obtained JMS Connection that failed to prepare", th);
+					}
+				}
+				throw ex;
+			}
 			if (this.startedCount > 0) {
 				this.connection.start();
 			}

spring-jms/src/test/java/org/springframework/jms/connection/SingleConnectionFactoryTests.java

@@ -16,6 +16,9 @@
 
 package org.springframework.jms.connection;
 
+import java.lang.reflect.Field;
+import java.util.concurrent.atomic.AtomicInteger;
+
 import jakarta.jms.Connection;
 import jakarta.jms.ConnectionFactory;
 import jakarta.jms.ExceptionListener;
@@ -29,7 +32,10 @@ import jakarta.jms.TopicConnectionFactory;
 import jakarta.jms.TopicSession;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.util.ReflectionUtils;
+
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
@@ -341,6 +347,76 @@ public class SingleConnectionFactoryTests {
 		assertThat(listener.getCount()).isEqualTo(1);
 	}
 
+	@Test
+	public void testWithConnectionFactoryAndExceptionListenerAndReconnectOnExceptionWithJMSException() throws Exception {
+		// Throws JMSException on setExceptionListener() method, but only at the first time
+		class FailingTestConnection extends TestConnection {
+			private int setExceptionListenerInvocationCounter;
+
+			@Override
+			public void setExceptionListener(ExceptionListener exceptionListener) throws JMSException {
+				setExceptionListenerInvocationCounter++;
+				// Throw JMSException on first invocation
+				if (setExceptionListenerInvocationCounter == 1) {
+					throw new JMSException("Test JMSException (setExceptionListener())");
+				}
+				super.setExceptionListener(exceptionListener);
+			}
+		}
+
+		// Prepare base JMS ConnectionFactory
+		// - createConnection(1st) -> TestConnection,
+		// - createConnection(2nd and next) -> FailingTestConnection
+		TestConnection testCon = new TestConnection();
+		FailingTestConnection failingCon = new FailingTestConnection();
+		AtomicInteger createConnectionMethodCounter = new AtomicInteger();
+		ConnectionFactory cf = mock(ConnectionFactory.class);
+		given(cf.createConnection()).willAnswer(invocation -> {
+			int methodInvocationCounter = createConnectionMethodCounter.incrementAndGet();
+			return methodInvocationCounter == 1 ? testCon : failingCon;
+		});
+
+		// Prepare SingleConnectionFactory (setReconnectOnException())
+		// - internal connection exception listener should be registered
+		SingleConnectionFactory scf = new SingleConnectionFactory(cf);
+		scf.setReconnectOnException(true);
+		Field conField = ReflectionUtils.findField(SingleConnectionFactory.class, "connection");
+		conField.setAccessible(true);
+
+		// Get connection (1st)
+		Connection con1 = scf.getConnection();
+		assertThat(createConnectionMethodCounter.get()).isEqualTo(1);
+		assertThat(con1).isNotNull();
+		assertThat(con1.getExceptionListener()).isNotNull();
+		assertThat(con1).isSameAs(testCon);
+		// Get connection again, the same should be returned (shared connection till some problem)
+		Connection con2 = scf.getConnection();
+		assertThat(createConnectionMethodCounter.get()).isEqualTo(1);
+		assertThat(con2.getExceptionListener()).isNotNull();
+		assertThat(con2).isSameAs(con1);
+
+		// Invoke reset connection to simulate problem with connection
+		// - SCF exception listener should be invoked -> connection should be set to null
+		// - next attempt to invoke getConnection() must create new connection
+		scf.resetConnection();
+		assertThat(conField.get(scf)).isNull();
+
+		// Attempt to get connection again
+		// - JMSException should be returned from FailingTestConnection
+		// - connection should be still null (no new connection without exception listener like before fix)
+		assertThatExceptionOfType(JMSException.class).isThrownBy(() -> scf.getConnection());
+		assertThat(createConnectionMethodCounter.get()).isEqualTo(2);
+		assertThat(conField.get(scf)).isNull();
+
+		// Attempt to get connection again -> FailingTestConnection should be returned
+		//  - no JMSException is thrown, exception listener should be present
+		Connection con3 = scf.getConnection();
+		assertThat(createConnectionMethodCounter.get()).isEqualTo(3);
+		assertThat(con3).isNotNull();
+		assertThat(con3).isSameAs(failingCon);
+		assertThat(con3.getExceptionListener()).isNotNull();
+	}
+
 	@Test
 	public void testWithConnectionFactoryAndLocalExceptionListenerWithCleanup() throws JMSException {
 		ConnectionFactory cf = mock();