fix MongoCursorItemReaderBuilder sorts field validation logic

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/data/builder/MongoCursorItemReaderBuilder.java

@@ -280,7 +280,7 @@ public MongoCursorItemReader<T> build() {
 		Assert.notNull(this.targetType, "targetType is required.");
 		Assert.state(StringUtils.hasText(this.jsonQuery) || this.query != null, "A query is required");
 
-		if (StringUtils.hasText(this.jsonQuery) || this.query != null) {
+		if (StringUtils.hasText(this.jsonQuery) && this.query == null) {
 			Assert.notNull(this.sorts, "sorts map is required.");
 		}
 
@@ -297,7 +297,9 @@ public MongoCursorItemReader<T> build() {
 		reader.setQuery(this.jsonQuery);
 		reader.setParameterValues(this.parameterValues);
 		reader.setFields(this.fields);
-		reader.setSort(this.sorts);
+		if (this.sorts != null) {
+			reader.setSort(this.sorts);
+		}
 		reader.setHint(this.hint);
 		reader.setBatchSize(this.batchSize);
 		reader.setLimit(this.limit);

spring-batch-infrastructure/src/test/java/org/springframework/batch/item/data/builder/MongoCursorItemReaderBuilderTests.java

@@ -34,7 +34,7 @@
  *
  * @author Mahmoud Ben Hassine
  */
-public class MongoCursorItemReaderBuilderTests {
+class MongoCursorItemReaderBuilderTests {
 
 	@Test
 	void testBuild() {
@@ -67,4 +67,47 @@ void testBuild() {
 		Assertions.assertEquals(maxTime, ReflectionTestUtils.getField(reader, "maxTime"));
 	}
 
+	@Test
+	void testBuildWithQueryNoSorts() {
+		// given
+		MongoTemplate template = mock();
+		Class<String> targetType = String.class;
+		Query query = mock();
+		int batchSize = 100;
+		int limit = 10000;
+		Duration maxTime = Duration.ofSeconds(1);
+
+		// when & then
+		Assertions.assertDoesNotThrow(() -> new MongoCursorItemReaderBuilder<String>().name("reader")
+			.template(template)
+			.targetType(targetType)
+			.query(query)
+			.batchSize(batchSize)
+			.limit(limit)
+			.maxTime(maxTime)
+			.build());
+	}
+
+	@Test
+	void testBuildWithJsonQueryNoSorts() {
+		// given
+		MongoTemplate template = mock();
+		Class<String> targetType = String.class;
+		String jsonQuery = "{ }";
+		int batchSize = 100;
+		int limit = 10000;
+		Duration maxTime = Duration.ofSeconds(1);
+
+		// when & then
+		Assertions.assertThrows(IllegalArgumentException.class,
+				() -> new MongoCursorItemReaderBuilder<String>().name("reader")
+					.template(template)
+					.targetType(targetType)
+					.jsonQuery(jsonQuery)
+					.batchSize(batchSize)
+					.limit(limit)
+					.maxTime(maxTime)
+					.build());
+	}
+
 }