Fix parameter value truncation in CommandLineJobOperator

CommandLineJobOperator.parse() uses String.split("=") which splits on
every "=" character, causing parameter values containing "=" to be
truncated. Additionally, parameters without "=" cause an
ArrayIndexOutOfBoundsException.

Use StringUtils.splitArrayElementsIntoProperties for consistency with
JobLauncherApplicationRunner and the deprecated CommandLineJobRunner.

Resolves #5295

Signed-off-by: Wordbe <seonghojin3@gmail.com>

Author: Wordbe

spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/CommandLineJobOperator.java

@@ -34,6 +34,7 @@
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.core.log.LogAccessor;
 import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
 
 import static org.springframework.batch.core.launch.support.ExitCodeMapper.JVM_EXITCODE_COMPLETED;
 import static org.springframework.batch.core.launch.support.ExitCodeMapper.JVM_EXITCODE_GENERIC_ERROR;
@@ -403,13 +404,9 @@ public static void main(String[] args) {
 		System.exit(exitCode);
 	}
 
-	private static Properties parse(List<String> jobParameters) {
-		Properties properties = new Properties();
-		for (String jobParameter : jobParameters) {
-			String[] tokens = jobParameter.split("=");
-			properties.put(tokens[0], tokens[1]);
-		}
-		return properties;
+	static Properties parse(List<String> jobParameters) {
+		Properties properties = StringUtils.splitArrayElementsIntoProperties(jobParameters.toArray(new String[0]), "=");
+		return (properties != null) ? properties : new Properties();
 	}
 
 }

spring-batch-core/src/test/java/org/springframework/batch/core/launch/support/CommandLineJobOperatorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 the original author or authors.
+ * Copyright 2025-2026 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.
@@ -15,6 +15,7 @@
  */
 package org.springframework.batch.core.launch.support;
 
+import java.util.List;
 import java.util.Properties;
 
 import org.junit.jupiter.api.Assertions;
@@ -187,6 +188,58 @@ void abandonJobExecutionNotStopped() throws Exception {
 		Mockito.verify(jobOperator, Mockito.never()).abandon(jobExecution);
 	}
 
+	@Test
+	void parseWithParameterContainingEqualsSign() {
+		// given
+		List<String> jobParameters = List.of("url=http://example.com?id=123");
+
+		// when
+		Properties properties = CommandLineJobOperator.parse(jobParameters);
+
+		// then
+		Assertions.assertEquals(1, properties.size());
+		Assertions.assertEquals("http://example.com?id=123", properties.get("url"));
+	}
+
+	@Test
+	void parseWithMultipleParameters() {
+		// given
+		List<String> jobParameters = List.of("name=test", "count=10");
+
+		// when
+		Properties properties = CommandLineJobOperator.parse(jobParameters);
+
+		// then
+		Assertions.assertEquals(2, properties.size());
+		Assertions.assertEquals("test", properties.get("name"));
+		Assertions.assertEquals("10", properties.get("count"));
+	}
+
+	@Test
+	void parseWithParameterContainingMultipleEqualsSign() {
+		// given
+		List<String> jobParameters = List.of("url=http://example.com?id=123&name=test");
+
+		// when
+		Properties properties = CommandLineJobOperator.parse(jobParameters);
+
+		// then
+		Assertions.assertEquals(1, properties.size());
+		Assertions.assertEquals("http://example.com?id=123&name=test", properties.get("url"));
+	}
+
+	@Test
+	void parseWithInvalidParameter() {
+		// given
+		List<String> jobParameters = List.of("invalidParam");
+
+		// when
+		Properties properties = CommandLineJobOperator.parse(jobParameters);
+
+		// then
+		Assertions.assertTrue(properties.isEmpty());
+	}
+
 	@Test
 	void recover() {
 		// given