m2e lifecycle-mapping not found

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The org.eclipse.m2e:lifecycle-mapping plugin doesn’t exist actually. It should be used from the <build><pluginManagement> section of your pom.xml. That way, it’s not resolved by Maven but can be read by m2e.

But a more practical solution to your problem would be to install the m2e build-helper connector in eclipse. You can install it from the Window > Preferences > Maven > Discovery > Open Catalog. That way build-helper-maven-plugin:add-sources would be called in eclipse without having you to change your pom.xml.

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