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The reason why IntelliJ IDEA cannot find the main class after copying and pasting the package
Home Java javaTutorial Why can't the main class be found after copying and pasting the package in IDEA?

Why can't the main class be found after copying and pasting the package in IDEA?

Apr 19, 2025 pm 08:54 PM
Solution intellij idea Why

Why can't the main class be found after copying and pasting the package in IDEA?

The reason why IntelliJ IDEA cannot find the main class after copying and pasting the package

When developing in IntelliJ IDEA, after copying and pasting the package directly into the src directory, the program runs the program but fails to find the main class. However, manually copying the package to the src directory in the project folder can run normally. This is due to IDEA's project management mechanism.

As an IDE, IDEA will cache and index the project structure to improve code analysis and compilation efficiency. Copy and paste the package directly in IDEA. IDEA may not have time to update the cache and index, resulting in the unrecognition of newly added packages and classes. Manually copying to the project folder is equivalent to directly modifying the file system. IDEA will rescan and index when reopening or refreshing the project to identify new files.

Therefore, the solution to this problem is as follows:

  1. Refresh the project: Right-click the project root directory in IDEA and select "Refresh" to force IDEA to reindex the project structure.

  2. Rebuild the project: Rebuild Project option in the Build menu, recompile the project and update the index.

  3. Restart IDEA: Restart IDEA forces it to reload the entire project.

Through the above methods, the problem of not being able to find the main class after copying and pasting the package in IDEA can usually be solved. This ensures that IDEA can correctly identify newly added code, thus avoiding runtime errors.

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