Fix JdbcMessageStoreChannelTests race condition

The message in the `QueueChannel` appears for consuming a bit earlier
than TX is committed

* Introduce `afterCommitLatch` into the test verify the state
when TX is really committed and data is removed from DB

**Cherry-pick to 5.0.x and 4.3.x**

(cherry picked from commit e4e4ee0)

# Conflicts:
#	spring-integration-jdbc/src/test/java/org/springframework/integration/jdbc/JdbcMessageStoreChannelTests-context.xml
#	spring-integration-jdbc/src/test/java/org/springframework/integration/jdbc/JdbcMessageStoreChannelTests.java

Author: artembilan

spring-integration-jdbc/src/test/java/org/springframework/integration/jdbc/JdbcMessageStoreChannelTests-context.xml

@@ -5,46 +5,43 @@
 	   xmlns:int="http://www.springframework.org/schema/integration"
 	   xmlns:jdbc="http://www.springframework.org/schema/jdbc"
 	   xmlns:int-jdbc="http://www.springframework.org/schema/integration/jdbc"
-	   xmlns:context="http://www.springframework.org/schema/context"
 	   xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
 		http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
 		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/integration/jdbc http://www.springframework.org/schema/integration/jdbc/spring-integration-jdbc.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
+		http://www.springframework.org/schema/integration/jdbc http://www.springframework.org/schema/integration/jdbc/spring-integration-jdbc.xsd">
 
-	<jdbc:embedded-database id="dataSource" type="DERBY" />
+	<jdbc:embedded-database id="dataSource" type="H2" />
 
 	<jdbc:initialize-database data-source="dataSource" ignore-failures="DROPS">
 		<jdbc:script location="${int.drop.script}" />
-		<jdbc:script location="${int.schema.script}" />
+		<jdbc:script location="org/springframework/integration/jdbc/schema-h2.sql" />
 	</jdbc:initialize-database>
 
 	<int-jdbc:message-store id="messageStore" data-source="dataSource" />
 
-	<channel id="input" xmlns="http://www.springframework.org/schema/integration">
-		<queue ref="queue"/>
-	</channel>
-
-	<int:channel id="output"/>
-
-	<int:logging-channel-adapter channel="output"/>
+	<int:channel id="input">
+		<int:queue ref="queue"/>
+	</int:channel>
 
 	<bean id="queue" class="org.springframework.integration.store.MessageGroupQueue">
 		<constructor-arg ref="messageStore" />
 		<constructor-arg value="JdbcMessageStoreChannelTests" />
 	</bean>
 
-	<service-activator id="service-activator" input-channel="input" output-channel="output" xmlns="http://www.springframework.org/schema/integration">
+	<int:service-activator id="service-activator" input-channel="input" output-channel="nullChannel">
 		<beans:bean class="org.springframework.integration.jdbc.JdbcMessageStoreChannelTests$Service" />
-		<poller fixed-rate="2000">
-			<transactional />
-		</poller>
-	</service-activator>
-
-	<context:property-placeholder location="int-${ENVIRONMENT:derby}.properties"
-								  system-properties-mode="OVERRIDE"
-								  ignore-unresolvable="true"
-								  order="1"/>
+		<int:poller fixed-rate="2000">
+			<int:transactional synchronization-factory="transactionSynchronizationFactory"/>
+		</int:poller>
+	</int:service-activator>
+
+	<int:transaction-synchronization-factory id="transactionSynchronizationFactory">
+		<int:after-commit expression="@afterCommitLatch.countDown()"/>
+	</int:transaction-synchronization-factory>
+
+	<bean id="afterCommitLatch" class="java.util.concurrent.CountDownLatch">
+		<constructor-arg value="1"/>
+	</bean>
 
 	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
 		<property name="dataSource" ref="dataSource" />

spring-integration-jdbc/src/test/java/org/springframework/integration/jdbc/JdbcMessageStoreChannelTests.java

@@ -17,6 +17,7 @@
 package org.springframework.integration.jdbc;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import java.util.List;
@@ -45,9 +46,28 @@ public class JdbcMessageStoreChannelTests {
 	@Autowired
 	private MessageChannel input;
 
+	@Autowired
+	private CountDownLatch afterCommitLatch;
+
 	@Autowired
 	private JdbcMessageStore messageStore;
 
+	@Autowired
+	@Qualifier("service-activator")
+	private AbstractEndpoint serviceActivator;
+
+
+	@Before
+	public void init() {
+		Service.reset(1);
+		this.serviceActivator.start();
+	}
+
+	@After
+	public void tearDown() {
+		this.serviceActivator.stop();
+	}
+
 	@BeforeTransaction
 	public void clear() {
 		for (MessageGroup group : messageStore) {
@@ -56,10 +76,9 @@ public void clear() {
 	}
 
 	@Test
-	public void testSendAndActivate() throws Exception {
-		Service.reset(1);
-		input.send(new GenericMessage<String>("foo"));
-		Service.await(10000);
+	public void testSendAndActivate() throws InterruptedException {
+		this.input.send(new GenericMessage<>("foo"));
+		assertTrue(this.afterCommitLatch.await(10, TimeUnit.SECONDS));
 		assertEquals(1, Service.messages.size());
 		assertEquals(0, messageStore.getMessageGroup("JdbcMessageStoreChannelTests").size());
 	}