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

Answer 2

In my case, it was response type in restTemplate:

ResponseEntity<Map<String, Integer>> response = restTemplate.exchange(
        eurl,
        HttpMethod.POST,
        requestEntity,
        new ParameterizedTypeReference<>() { <---- this causes error
        }
);

Should be like this:

ParameterizedTypeReference<Map<String, Integer>> responseType = new ParameterizedTypeReference<>() {};

ResponseEntity<Map<String, Integer>> response = restTemplate.exchange(
        url,
        HttpMethod.POST,
        requestEntity,
        responseType
);

Answer 3

I had the same problem. I fixed changing my settings. Target bytecode version for equals Project bytecode version.

Answer 4

1. On Intellij IDEA Ctrl + Alt + S to open settings.
2. Build, Execution, Deployment -> Compiler -> Java Compiler
3. choose your java version from Project bytecode version
4. Uncheck Use compiler from module target JDK when possible
5. click apply and ok.

Answer 5

You have to disabled the Javac Options: Use compiler from module target JDK when possible.

Answer 6

In my case it was because of lombok library with intellij 2019.2 & java11.

According to this IDEA bug after workaround idea works again:

Disable all building from intelliJ and dedicate the build to Maven.