META-INF/MANIFEST.MF file not found in unnamed.war

Add MANIFEST.MF to YOUR_PROJECT_NAME/web/src/main/webapp/META-INF/ folder with the simple content:

Manifest-Version: 1.0

Or you can generate it using IntelliJ Artifacts Configuring

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原文地址：https://www.cnblogs.com/chintsai/p/11829194.html