(crawler4j)SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”.

While using crawler4j to crawl some data, I met errors as following:

Based on the official document I found solution:

https://www.slf4j.org/codes.html#StaticLoggerBinder

Then I downloadedlogback and import logback-classic.jar.

Perfect!

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