Ignore test that fails sometimes but adds no value

spring-batch-infrastructure/src/test/java/org/springframework/batch/support/transaction/ConcurrentTransactionAwareProxyTests.java

@@ -33,8 +33,11 @@ import java.util.concurrent.ExecutorCompletionService;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.springframework.transaction.PlatformTransactionManager;
 import org.springframework.transaction.TransactionStatus;
@@ -48,11 +51,13 @@ import org.springframework.util.Assert;
  */
 public class ConcurrentTransactionAwareProxyTests {
 
+	private static Log logger = LogFactory.getLog(ConcurrentTransactionAwareProxyTests.class);
+
 	private PlatformTransactionManager transactionManager = new ResourcelessTransactionManager();
 
-	int outerMax = 10;
+	int outerMax = 20;
 
-	int innerMax = 15;
+	int innerMax = 30;
 
 	private ExecutorService executor;
 
@@ -84,14 +89,15 @@ public class ConcurrentTransactionAwareProxyTests {
 	@Test
 	public void testConcurrentTransactionalAppendOnlyList() throws Exception {
 		List<String> list = TransactionAwareProxyFactory.createAppendOnlyTransactionalList();
-		testList(list);
+		testList(list, false);
 	}
 
+	@Ignore("This fails too often and is a false negative")
 	@Test
 	public void testConcurrentTransactionalList() throws Exception {
 		List<String> list = TransactionAwareProxyFactory.createTransactionalList();
 		try {
-			testList(list);
+			testList(list, true);
 			fail("Expected ExecutionException or AssertionError (but don't panic if it didn't happen: it probably just means we got lucky for a change)");
 		}
 		catch (ExecutionException e) {
@@ -155,7 +161,7 @@ public class ConcurrentTransactionAwareProxyTests {
 
 	}
 
-	private void testList(final List<String> list) throws Exception {
+	private void testList(final List<String> list, final boolean mutate) throws Exception {
 
 		for (int i = 0; i < outerMax; i++) {
 
@@ -166,7 +172,14 @@ public class ConcurrentTransactionAwareProxyTests {
 						String value = "bar" + i;
 						saveInListAndAssert(list, value);
 						result.add(value);
+						// Need to slow it down to allow threads to interleave
+						Thread.sleep(10L);
+						if (mutate) {
+							list.remove(value);
+							list.add(value);
+						}
 					}
+					logger.info("Added: " + innerMax + " values");
 					return result;
 				}
 			});

spring-batch-infrastructure/src/test/resources/log4j.properties

@@ -6,4 +6,5 @@ log4j.appender.stdout.layout.ConversionPattern=%d %p %t [%c] - <%m>%n
 
 log4j.category.org.springframework.batch=DEBUG
 log4j.category.org.springframework.transaction=INFO
+log4j.category.org.springframework.batch.support.transaction.ResourcelessTransactionManager=INFO
 log4j.category.org.springframework.jdbc.datasource=INFO