wu-sheng commented on pull request #5489:
URL: https://github.com/apache/skywalking/pull/5489#issuecomment-692565865
CI fails too. Even I don't think CI tested this feature.
> [ERROR] Failed to execute goal
org.apache.maven.plugins:maven-checkstyle-plugin:3.1.0:check (validate) on
project apm-ehcache-2.x-plugin: Failed during checkstyle execution: Failed
during checkstyle configuration: unable to parse configuration stream: Property
${import.control} has not been set -> [Help 1]
**Property ${import.control} has not been set**, I think this is the reason.
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