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创建于 2026年02月03日 07:02

Check your dependency tree for exclusions. Sometimes a transitive dependency containing PSI classes gets excluded without you noticing. 

1. 社区
2. IntelliJ IDEA Open API and Plugin Development
3. NoClassDefFoundError with "psiMethod"

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创建于 2026年02月03日 07:01

If you recently updated the IDE or SDK, some internal APIs might have moved or changed. Invalidating caches and restarting the IDE is worth trying. 

1. 社区
2. IntelliJ IDEA Open API and Plugin Development
3. NoClassDefFoundError with "psiMethod"

• 0 票

创建于 2026年02月03日 07:00

Could be a classloader issue, especially in plugin development. Make sure the required IntelliJ modules are declared in your plugin configuration. 

1. 社区
2. IntelliJ IDEA Open API and Plugin Development
3. NoClassDefFoundError with "psiMethod"

• 0 票

创建于 2026年02月03日 06:59

I’ve seen this when Gradle builds fine but the IDE runtime doesn’t include certain platform libraries. Re-importing the project and rebuilding can sometimes fix it. 

1. 社区
2. IntelliJ IDEA Open API and Plugin Development
3. NoClassDefFoundError with "psiMethod"

• 0 票

已编辑于 2026年02月03日 06:57

Errors like this often happen when an IntelliJ/IDEA PSI class isn’t available at runtime even though it compiled fine. Double-checking plugin or SDK versions helps a lot. Randomly, I relax between ...

1. 社区
2. IntelliJ IDEA Open API and Plugin Development
3. NoClassDefFoundError with "psiMethod"

• 0 票

创建于 2025年12月29日 07:06

I ran into the same issue before — updating the IntelliJ SDK and re-importing the dependencies fixed the psiMethod error for me. 

1. 社区
2. IntelliJ IDEA Open API and Plugin Development
3. NoClassDefFoundError with "psiMethod"

• 1 票