fix: resolve SLF4J and Logback compatibility issues

[GOODBOY008]

Summary

This PR fixes the compatibility issue between logback-classic and slf4j-api, and removes the erroneous Spring Boot configuration from logback.xml.

Changes

1. Update logback-classic version (pom.xml)

• Changed `logback-classic.version` from `1.5.24` to `1.3.14`
• Logback 1.3.x is the last version compatible with Java 8 (while supporting SLF4J 2.x)
• Logback 1.4.x/1.5.x requires Java 11+

2. Update slf4j-api version (pom.xml)

• Changed `slf4j-api.version` from `1.7.36` to `2.0.17`
• SLF4J 2.0.x is compatible with Java 8+ and works with Logback 1.3.x

3. Replace log bridging dependencies (pom.xml)

• Replaced `slf4j-simple`, `jcl-over-slf4j`, `log4j-over-slf4j` with `log4j-to-slf4j`
• Simplifies the logging configuration and avoids binding conflicts

4. Fix logback.xml configuration

• Removed `<include resource="org/springframework/boot/logging/logback/defaults.xml"/>` (not available in test classpath)
• Added explicit log pattern definition
• Changed root log level from `DEBUG` to `INFO` for cleaner test output
• Added POI logger configuration to reduce noise

Compatibility Matrix

Component	Version	Java Compatibility
slf4j-api	2.0.17	Java 8+
logback-classic	1.3.14	Java 8+
logback-core	1.3.14	Java 8+

[Copilot]

Pull request overview

This PR addresses SLF4J and Logback compatibility issues by removing the slf4j-simple binding in favor of logback-classic and fixing Logback configuration files to remove Spring Boot-specific elements that are not supported in standard Logback.

Key changes:

• Removed slf4j-simple dependency and its version property from the parent POM
• Downgraded logback-classic version from 1.5.23 to 1.2.13
• Updated fesod-sheet test logback configuration to use standard Logback properties instead of Spring Boot includes

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
pom.xml	Removed slf4j-simple dependency and version property, downgraded logback-classic version to 1.2.13, and removed slf4j-simple from parent dependencies
fesod-sheet/src/test/resources/logback.xml	Replaced Spring Boot logback include with standard property definition and changed root log level from DEBUG to INFO

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[GOODBOY008]

@alaahong @delei lei PTAL

[alaahong]

why not upgrade to slf4j 2.x ?
And meanwhile, can you also attach the screenshot of actual execution log?

[GOODBOY008]

@alaahong It’s fine for me to upgrade SLF4J to 2.x, as long as we can reach a consensus.Considered both options—upgrading SLF4J and staying with SLF4J 1.7.x. To minimize risk and scope of change, I chose the minimal-change approach by downgrading logback-classic.

Issue：

Compatibility Issue

• Logback 1.5.x requires SLF4J 2.0.x, but this project uses SLF4J 1.7.36

Redundant Issue

• The project has both slf4j-simple and logback-classic as test dependencies,slf4j-simple and logback-classic are competing SLF4J implementations

Log output in console (Before)

Log output in console (Remove slf4j-simple)

Log output in console (Apply the current pr)

[GOODBOY008]

@alaahong PR updated. SLF4J has been upgraded to 2.x, and logback-classic has been downgraded to 1.3.x to maintain Java 8 compatibility.

Reference：

Java Logging Part 2: Logging and Package Exclusion with SLF4J + Logback

[GOODBOY008]

@delei PTAL,If you have time, Thank you~