CODEWITHSUNDEEP
javaeclipsejavac
Malt
Malt

Reputation: 30285

Eclipse gives dead code warning for reachable code

The following code causes Eclipse to display a dead code warning although the code is reachable. Am I missing something here, or is this an Eclipse/javac bug?

import java.util.ArrayList;

public class DeadCodeDemo {

    public static class SomeClosable implements AutoCloseable {
        @Override
        public void close() throws Exception {
        }
    }

    public static ArrayList<String> throwRuntime() {
        throw new RuntimeException();
    }

    public static void main(String[] args) {
        ArrayList<String> list = null;
        try {
            try (SomeClosable c = new SomeClosable()) {
                list = throwRuntime();
            }
            try (SomeClosable c = new SomeClosable()) {
                list.clear();
            }
        } catch (Exception e) {
            if (list != null) { // Warning: Redundant null check: The variable list cannot be null at this location
                System.out.println("List is not null");
            } else {
                System.out.println("List is null"); // Warning: Dead code
            }
        }
    }
}

The code prints List is null

I'm using Eclipse 4.7.3a (Oxygen.3a) and JDK 8_162

Upvotes: 2

Views: 133

Answers (1)

Eugene
Eugene

Reputation: 120858

I think it's this issue, still open.

Just remember that this is Eclipse warning, not javac - and that is pretty much all you should care until that issue is resolved (even if it 7 years old now)

Upvotes: 4

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