Polish "Migrate to Spring Batch 6"

See gh-46216

Author: snicoll

spring-boot-project/spring-boot-batch/src/main/java/org/springframework/boot/batch/autoconfigure/BatchAutoConfiguration.java

@@ -173,8 +173,9 @@ protected ExecutionContextSerializer getExecutionContextSerializer() {
 					: super.getExecutionContextSerializer();
 		}
 
-		@SuppressWarnings("removal")
 		@Override
+		@Deprecated(since = "4.0.0", forRemoval = true)
+		@SuppressWarnings("removal")
 		protected JobParametersConverter getJobParametersConverter() {
 			return (this.jobParametersConverter != null) ? this.jobParametersConverter
 					: super.getJobParametersConverter();

spring-boot-project/spring-boot-batch/src/main/java/org/springframework/boot/batch/autoconfigure/BatchConversionServiceCustomizer.java

@@ -20,8 +20,8 @@
 
 /**
  * Callback interface that can be implemented by beans wishing to customize the
- * {@link ConfigurableConversionService} that is used by the batch infrastructure
- * while retaining its default auto-configuration.
+ * {@link ConfigurableConversionService} that is used by the batch infrastructure while
+ * retaining its default auto-configuration.
  *
  * @author Claudio Nave
  * @since 4.0.0

spring-boot-project/spring-boot-batch/src/test/java/org/springframework/boot/batch/autoconfigure/BatchAutoConfigurationTests.java

@@ -508,6 +508,8 @@ void customJdbcPropertiesIsUsed() {
 	}
 
 	@Test
+	@Deprecated(since = "4.0.0", forRemoval = true)
+	@SuppressWarnings("removal")
 	void customJobParametersConverterIsUsed() {
 		this.contextRunner.withUserConfiguration(EmbeddedDataSourceConfiguration.class)
 			.withBean(JobParametersConverter.class, JsonJobParametersConverter::new)
@@ -520,6 +522,8 @@ void customJobParametersConverterIsUsed() {
 	}
 
 	@Test
+	@Deprecated(since = "4.0.0", forRemoval = true)
+	@SuppressWarnings("removal")
 	void defaultJobParametersConverterIsUsed() {
 		this.contextRunner.withUserConfiguration(EmbeddedDataSourceConfiguration.class).run((context) -> {
 			assertThat(context).doesNotHaveBean(JobParametersConverter.class);