java-symbol-solver-core/src/main/java/com/github/javaparser/symbolsolver/javaparsermodel/TypeExtractor.java
private ResolvedType solveDotExpressionType(ResolvedReferenceTypeDeclaration parentType, FieldAccessExpr node) {
        // Fields and internal type declarations cannot have the same name.
        // Thus, these checks will always be mutually exclusive.
        if (parentType.hasField(node.getName().getId())) {
            return parentType.getField(node.getName().getId()).getType();
        } else if (parentType.hasInternalType(node.getName().getId())) {
            return new ReferenceTypeImpl(parentType.getInternalType(node.getName().getId()), typeSolver);
        } else {
            throw new UnsolvedSymbolException(node.getName().getId());
        }
    }
private ResolvedType solveDotExpressionType(ResolvedReferenceTypeDeclaration parentType, FieldAccessExpr node) {
        // Fields and internal type declarations cannot have the same name.
        // Thus, these checks will always be mutually exclusive.
        if (parentType.hasField(node.getName().getId())) {
            return parentType.getField(node.getName().getId()).getType();
        } else if (parentType.hasInternalType(node.getName().getId())) {
            return new ReferenceTypeImpl(parentType.getInternalType(node.getName().getId()), typeSolver);
        } else {
            throw new UnsolvedSymbolException(node.getName().getId());
        }
    }
Java Parser can't differentiate between packages, internal types, and fields.
All three are lumped together into FieldAccessExpr. We need to differentiate them.