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Editorial Team
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Asked: 2026-05-15T07:14:54+00:00

I’ve noticed that a lot of projects have the following structure: Project-A bin lib

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I’ve noticed that a lot of projects have the following structure:

  • Project-A
    • bin
    • lib
    • src
      • main
        • java
          • RootLevelPackageClass.java

I currently use the following convention (as my projects are 100% java):

  • Project-A
    • bin
    • lib
    • src
      • RootLevelPackageClass.java

I’m not currently using Maven but am wondering if this is a Maven convention or not or if there is another reason. Can someone explain why the first version is so popular these days and if I should adopt this new convention or not?

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1 Answer

  1. Editorial Team

    Main benefit is in having the test directory as subdirectory of src with the same directory structure as the one in main:

    • Project-A
      • bin
      • lib
      • src
        • main
          • java
            • RootLevelPackageClass.java
          • resources
        • test
          • java
            • TestRootLevelPackageClass.java
          • resources

    All package private methods of RootLevelPackageClass will be visible, i.e. testable from TestRootLevelPackageClass. Since the testing code is also source its place should be under src directory.

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