SPI加载外部扩展class异常ClassNotFoundException

[luochen-123-bot]

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Ⅰ. Issue Description

使用外部扩展，SPI无法加载对应的class，抛出java.lang.ClassNotFoundException:io.seata.sqlparser.druid.dm.DmOperateRecognizerHolder

io.seata.common.loader.EnhancedServiceLoader.InnerEnhancedServiceLoader#loadFile 能够扫描到对应的META-INF/services下的自定义文件，如果将新增的扩展类放到seata-all-1.6.1.jar中可以正常使用，如果使用外部扩展则不能使用。使用到的类加载器是io.seata.sqlparser.druid.DruidIsolationClassLoader

Ⅱ. Describe what happened

Ⅲ. Describe what you expected to happen

Ⅳ. How to reproduce it (as minimally and precisely as possible)

1. xxx
2. xxx
3. xxx

Minimal yet complete reproducer code (or URL to code):

Ⅴ. Anything else we need to know?

Ⅵ. Environment:

• JDK version(e.g. java -version): 17
• Seata client/server version: 1.6.1
• Database version:
• OS(e.g. uname -a):
• Others: