I created a webapp project using Maven in Eclipse, and I found there is a source named target/m2e-wtp/web-resources folder in "Deployment Assembly" configuration card. What does this source stand for? Should I keep it or delete it?
What is target/m2e-wtp/web-resources in Deployment Assembly?
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First of all, the fact that you are having this entry means that your Eclipse is working smoothly. You have M2Eclipse and m2e-wtp installed correctly.
M2Eclipse is a project that integrates Maven into Eclipse. It provides the ability to build your project directly within Eclipse (and a bunch of other things). m2e-wtp is a subset of M2E that focuses on integrating with Eclipse Web Tools Project so it is used in conjunction with JavaEE projects.
When I say "integrating", it really means that a lot of magic is happening behind the scenes to make everything work smoothly. One of those magic ingredients for m2e-wtp is that
target/m2e-wtp-web-resourcesfolder, that is used when you're deploying your web-aplication inside Eclipse itself. Quoting from the documentation:So, fear not, the presence of that folder is actually an indication that everything is all right with your setup. If you delete that entry by mistake, it will be recreated the next time you update your Maven project in Eclipse.