IntelliJ IDEA tells me “Error:java: Compilation failed: internal java compiler error idea”

Question

When I compile a Java project using IntelliJ IDEA, it gives me the following output (and error):

Information:Eclipse compiler 4.6.2 was used to compile java          


        

Answer 1

In JIdea 2020.1.2 and above,

This is may be the language-level set in Project Structure is not compatible with the target byte-code version.

You have to change the target bytecode version .

1. Go to Settings [ Ctrl+Alt+S ]
2. Select Java Compiler
3. Select module in the table
4. Change the byte-code version to map what you selected in the previous step for language-level

NOTE : How to check the language-level

1. Go to Project Structure [ Ctrl+Alt+Shift+S ]
2. Select Modules sub section
3. Select each module
4. Under sources-section, check Language Level