Can't get binding of SimpleName

[maijun-sec]

I'am using the following source code to do some test.

The maven configuration:

        <dependency>
            <groupId>org.eclipse.jdt</groupId>
            <artifactId>org.eclipse.jdt.core</artifactId>
            <version>3.38.0</version>
        </dependency>

The source code:

package org.example;

import org.eclipse.jdt.core.dom.*;

public class App  {
    public static void main( String[] args ) {
        ASTParser parser = ASTParser.newParser(AST.getJLSLatest());
        parser.setKind(ASTParser.K_COMPILATION_UNIT);
        parser.setResolveBindings(true);

        String sourceCode = """
            class A {
              void method1(){
                int a = 3;
                int b = 4;
                int c = a + b;
                System.out.println(c);
              }
            }
        """;
        parser.setSource(sourceCode.toCharArray());

        ASTNode cu = parser.createAST(null);
        System.out.println(cu);

        ASTVisitor visitor = new ASTVisitor() {
            @Override
            public boolean visit(SimpleName node) {
                System.out.println(node.getIdentifier());
                IBinding binding = node.resolveBinding();
                if (binding != null) {
                    System.out.println(binding);
                }
                return super.visit(node);
            }
        };

        cu.accept(visitor);
    }
}

However, I can't get the binding at line 30~33. Is there something wrong with my configuration? Thank you very much.

[maijun-sec]

I don't know why, but I fixed the problem by adding the following two lines of code (both lines are required):

        parser.setEnvironment(null, null, null, true);
        parser.setUnitName("A.java");