[POOL-419] Fix for POOL-419. Before adding the returned object to the…

… pool, we must check whether it is invalid.

src/test/java/org/apache/commons/pool3/TestPoolUtils.java

@@ -705,9 +705,11 @@ void testPool419() throws Exception{
 
         final GenericObjectPoolConfig<Object> config = new GenericObjectPoolConfig<>();
 
-        config.setMaxTotal(1000);
-        config.setMaxIdle(1000);
-        config.setMinIdle(1000);
+        final int maxConnections = 10000;
+
+        config.setMaxTotal(maxConnections);
+        config.setMaxIdle(maxConnections);
+        config.setMinIdle(1);
 
         @SuppressWarnings("unchecked")
         final PooledObjectFactory<Object, RuntimeException> pof = createProxy(PooledObjectFactory.class, calledMethods);
@@ -720,7 +722,7 @@ void testPool419() throws Exception{
 
             List<FutureTask<Boolean>> tasks = new ArrayList<>();
 
-            for (int i = 0; i < 1000; i++) {
+            for (int i = 0; i < maxConnections; i++) {
                 poolObjects.add(connectionPool.borrowObject());
             }
 
@@ -739,10 +741,7 @@ void testPool419() throws Exception{
                 }));
             }
 
-
-            for(FutureTask<Boolean> task : tasks) {
-                executor.submit(task);
-            }
+            tasks.forEach(executor::submit);
 
             startLatch.countDown(); // Start all tasks simultaneously