Bug description

CommandLineJobOperator.parse() uses String.split("=") without a limit, which splits on every = character. This causes two problems:

1. Parameter values containing = get truncated (e.g. URLs with query strings)
2. Parameters without = throw ArrayIndexOutOfBoundsException

The deprecated CommandLineJobRunner and Spring Boot's JobLauncherApplicationRunner both use StringUtils.splitArrayElementsIntoProperties which correctly splits only on the first =.

Environment

Spring Batch 6.0.x (all versions since CommandLineJobOperator was introduced in 6.0)

Steps to reproduce

Run a job via CommandLineJobOperator with a parameter containing = in the value:

java ... CommandLineJobOperator com.example.MyJobConfig start myJob url=http://example.com?id=123

Expected behavior

The parameter should be parsed as url → http://example.com?id=123.

Current behavior

split("=") produces ["url", "http://example.com?id", "123"], so only http://example.com?id is stored as the value. The rest is lost.

Relevant code

https://github.com/spring-projects/spring-batch/blob/main/spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/CommandLineJobOperator.java#L406-L413

For comparison, JobLauncherApplicationRunner handles this correctly:
https://github.com/spring-projects/spring-boot/blob/main/module/spring-boot-batch/src/main/java/org/springframework/boot/batch/autoconfigure/JobLauncherApplicationRunner.java#L148