Why Does IntelliJ Show \'Cannot Resolve Symbol\' Errors Despite Successful Compilation?

IntelliJ Inspection: "Cannot Resolve Symbol" Despite Successful Compilation

Problem:

When using IntelliJ, developers have encountered a peculiar issue where the IDE's inspections report "Cannot resolve symbol" errors for imported classes, despite the code compiling successfully.

Description:

In a specific instance, after adding the hunnysoft's jmime library as a Maven dependency, IntelliJ's inspections failed to recognize classes imported from the library. However, the code compiled without errors, indicating no actual compilation issues.

Investigation:

• The issue persists even when manually adding the jmime.jar file to a new J2SE application project.
• IntelliJ's intention mechanism detects the log4j import but not the jmime imports.
• The "Packages" view in the "Projects" window correctly displays the imported classes under the "com.hunnysoft.jmime" package.

Possible Explanations:

• Missing or incomplete classpath for the inspection's classpath.
• Issue with the jmime.jar file itself (unlikely).
• Missing dependency issue (unconfirmed).

Solutions:

• File | Invalidate Caches: Invalidate caches and restart IntelliJ.
• Delete System Directory: Delete IDEA's system directory and re-import the Maven project.
• Manually Verify Classes: Use javap to verify that the classes from the jmime.jar file report the correct names.

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