[Demonstration 1]

[Buggy Method]
@Override
public void visit(IdentifierExpression node) throws ASTVisitorException {
    System.out.println("-IdentifierExpression");
    String name = node.getIdentifier();
    if (!node.isLocal()) {
        ASymTableEntry symTableEntry = _symTable.lookupGlobalScope(name);
        if (symTableEntry == null) {
            String msg = "Global variable: " + name + " doesn't exist";
            ASTUtils.error(node, msg);
        }
    } else {
        HashMap<String, Object> returnVal = _symTable.lookUpVariable(name, _scope);
        ASymTableEntry symTableEntry = (ASymTableEntry) returnVal.get("symbolTableEntry");
        boolean foundUserFunction = (boolean) returnVal.get("foundUserFunction");
        if (symTableEntry == null) {
            if (node.isLocal()) {
                symTableEntry = new GlobalVariableEntry(name);
            } else {
                symTableEntry = new LocalVariableEntry(name, _scope);
            }
            _symTable.insertSymbolTable(symTableEntry);
        } else {
            if (foundUserFunction && !symTableEntry.hasGlobalScope() && !(symTableEntry instanceof AFunctionEntry) && (_scope != symTableEntry.getScope())) {
                String msg = "Cannot access symbol: " + name + " (in scope " + symTableEntry.getScope() + " ).";
                ASTUtils.error(node, msg);
            }
        }
    }
}

[Buggy Hunk]
if (node.isLocal()) {

[Patch]
if (!node.isLocal() || this._scope == 0) {

[Demonstration 2]

[Buggy Method]
private void display(ResultSet rs) throws SQLException {
    while (rs.next()) {
        System.out.println(rs.getString(1) + " " + rs.getString(2) + " " + rs.getString(3) + " " + rs.getString(4) + " " + rs.getString(5));
    }
}

[Buggy Hunk]
System.out.println(rs.getString(1)+" "+rs.getString(2)+" "+rs.getString(3)+" "+rs.getString(4)+" "+rs.getString(5));

[Patch]
System.out.println(rs.getString(1)+" "+rs.getString(2)+" "+rs.getString(3)+" "+rs.getString(4)+" "+rs.getString(5)+" "+rs.getString(6));

[Demonstration 3]

[Buggy Method]
public static Result service(String ownerName, String projectName, String service, boolean isAdvertise) throws IOException, UnsupportedOperationException, ServletException {
    if (!isSupportedService(service)) {
        return forbidden(String.format("Unsupported service: '%s'", service));
    }
    Project project = Project.findByOwnerAndProjectName(ownerName, projectName);
    if (project == null) {
        return notFound();
    }
    models.User user = UserApp.currentUser();
    if (!isAllowed(project, service)) {
        if (user.isAnonymous()) {
            return BasicAuthAction.unauthorized(response());
        } else {
            // If you want the Git client showing your custom message to
            // the user, the Content-Type should be exact "text/plain"
            // without any parameter. For more details, see the code at
            // https://github.com/git/git/commit/426e70d4a11ce3b4f70636d57c6a0ab16ae08a00#diff-eea0ad565ec5903a11b6023755d491cfR154
            response().setHeader("Content-Type", "text/plain");
            return forbidden(String.format("'%s' has no permission to '%s/%s'.", user.name, ownerName, projectName));
        }
    }
    if (isAdvertise) {
        return ok(RepositoryService.gitAdvertise(project, service, response()));
    } else {
        if (request().body().isMaxSizeExceeded()) {
            return status(REQUEST_ENTITY_TOO_LARGE);
        } else {
            user.visits(project);
            return ok(RepositoryService.gitRpc(project, service, request(), response()));
        }
    }
}

[Buggy Hunk]
user.name, ownerName, projectName));

[Patch]
user.loginId, ownerName, projectName));