Attempt to close all delegate stream readers even when some fail

Signed-off-by: Elimelec Burghelea <elimelec1@protonmail.com>

spring-batch-core/src/test/java/org/springframework/batch/core/step/item/TaskletStepExceptionTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2008-2022 the original author or authors.
+ * Copyright 2008-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -63,6 +63,7 @@ import static org.springframework.batch.core.BatchStatus.UNKNOWN;
  * @author David Turanski
  * @author Mahmoud Ben Hassine
  * @author Parikshit Dutta
+ * @author Elimelec Burghelea
  */
 class TaskletStepExceptionTests {
 
@@ -212,8 +213,8 @@ class TaskletStepExceptionTests {
 
 		taskletStep.execute(stepExecution);
 		assertEquals(FAILED, stepExecution.getStatus());
-		assertTrue(stepExecution.getFailureExceptions().contains(taskletException));
-		assertTrue(stepExecution.getFailureExceptions().contains(exception));
+		assertEquals(stepExecution.getFailureExceptions().get(0), taskletException);
+		assertEquals(stepExecution.getFailureExceptions().get(1).getSuppressed()[0], exception);
 		assertEquals(2, jobRepository.getUpdateCount());
 	}
 

spring-batch-core/src/test/java/org/springframework/batch/core/step/tasklet/TaskletStepTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2023 the original author or authors.
+ * Copyright 2006-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -761,7 +761,7 @@ class TaskletStepTests {
 		Throwable ex = stepExecution.getFailureExceptions().get(0);
 
 		// The original rollback was caused by this one:
-		assertEquals("Bar", ex.getMessage());
+		assertEquals("Bar", ex.getSuppressed()[0].getMessage());
 	}
 
 	@Test
@@ -791,7 +791,7 @@ class TaskletStepTests {
 		assertEquals("", msg);
 		Throwable ex = stepExecution.getFailureExceptions().get(0);
 		// The original rollback was caused by this one:
-		assertEquals("Bar", ex.getMessage());
+		assertEquals("Bar", ex.getSuppressed()[0].getMessage());
 	}
 
 	/**

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/CompositeItemStream.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2022 the original author or authors.
+ * Copyright 2006-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,7 +28,7 @@ import org.springframework.batch.item.ItemStreamException;
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
- *
+ * @author Elimelec Burghelea
  */
 public class CompositeItemStream implements ItemStream {
 
@@ -102,13 +102,26 @@ public class CompositeItemStream implements ItemStream {
 	/**
 	 * Broadcast the call to close.
 	 * @throws ItemStreamException thrown if one of the {@link ItemStream}s in the list
-	 * fails to close. This is a sequential operation so all itemStreams in the list after
-	 * the one that failed to close will remain open.
+	 * fails to close.
 	 */
 	@Override
 	public void close() throws ItemStreamException {
+		List<Exception> exceptions = new ArrayList<>();
+
 		for (ItemStream itemStream : streams) {
-			itemStream.close();
+			try {
+				itemStream.close();
+			}
+			catch (Exception e) {
+				exceptions.add(e);
+			}
+		}
+
+		if (!exceptions.isEmpty()) {
+			String message = String.format("Failed to close %d delegate(s) due to exceptions", exceptions.size());
+			ItemStreamException holder = new ItemStreamException(message);
+			exceptions.forEach(holder::addSuppressed);
+			throw holder;
 		}
 	}
 

spring-batch-infrastructure/src/test/java/org/springframework/batch/item/support/CompositeItemStreamTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2022 the original author or authors.
+ * Copyright 2006-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,19 +15,25 @@
  */
 package org.springframework.batch.item.support;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
 import java.util.ArrayList;
 import java.util.List;
 
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
 import org.springframework.batch.item.ExecutionContext;
 import org.springframework.batch.item.ItemStream;
+import org.springframework.batch.item.ItemStreamException;
 import org.springframework.batch.item.ItemStreamSupport;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 /**
  * @author Dave Syer
- *
+ * @author Elimelec Burghelea
  */
 class CompositeItemStreamTests {
 
@@ -90,6 +96,40 @@ class CompositeItemStreamTests {
 		assertEquals(1, list.size());
 	}
 
+	@Test
+	void testClose2Delegates() {
+		ItemStream reader1 = Mockito.mock(ItemStream.class);
+		ItemStream reader2 = Mockito.mock(ItemStream.class);
+		manager.register(reader1);
+		manager.register(reader2);
+
+		manager.close();
+
+		verify(reader1, times(1)).close();
+		verify(reader2, times(1)).close();
+	}
+
+	@Test
+	void testClose2DelegatesThatThrowsException() {
+		ItemStream reader1 = Mockito.mock(ItemStream.class);
+		ItemStream reader2 = Mockito.mock(ItemStream.class);
+		manager.register(reader1);
+		manager.register(reader2);
+
+		doThrow(new ItemStreamException("A failure")).when(reader1).close();
+
+		try {
+			manager.close();
+			Assertions.fail("Expected an ItemStreamException");
+		}
+		catch (ItemStreamException ignored) {
+
+		}
+
+		verify(reader1, times(1)).close();
+		verify(reader2, times(1)).close();
+	}
+
 	@Test
 	void testCloseDoesNotUnregister() {
 		manager.setStreams(new ItemStream[] { new ItemStreamSupport() {