[Demonstration 1]

[Buggy Method]
private void finish() {
    // Nothing?
    if (op == Op.NONE) {
        clear();
        return;
    }
    List<Object> params = new ArrayList<>();
    StringBuilder buf = new StringBuilder();
    buf.append(op.toString());
    if (op == Op.UPDATE) {
        writeColumnFamily(buf);
        // Timestamps can be sent using statement options.
        // TTL cannot. But just to be extra funny, at least
        // origin does not seem to respect the timestamp
        // in statement, so we'll add them to the CQL string as well.
        writeUsingTimestamp(buf, params);
        writeUsingTTL(buf, params);
        buf.append(" SET ");
    }
    if (op == Op.INSERT) {
        buf.append(" INTO");
        writeColumnFamily(buf);
    }
    int i = 0;
    for (Map.Entry<ColumnDefinition, ColumnOp> e : values.entrySet()) {
        ColumnDefinition c = e.getKey();
        ColumnOp o = e.getValue();
        String s = o != null ? o.apply(c, params) : null;
        if (op != Op.INSERT) {
            if (i++ > 0) {
                buf.append(", ");
            }
            ensureWhitespace(buf);
            buf.append(c.name.toString());
            if (s != null) {
                buf.append(s);
            }
        }
    }
    if (op == Op.DELETE) {
        buf.append(" FROM");
        writeColumnFamily(buf);
        writeUsingTimestamp(buf, params);
    }
    if (op != Op.INSERT) {
        buf.append(" WHERE ");
    }
    // Add "WHERE pk1 = , pk2 = "
    List<ColumnDefinition> pk = cfMetaData.partitionKeyColumns();
    AbstractType<?> type = cfMetaData.getKeyValidator();
    ByteBuffer[] bufs;
    if (type instanceof AbstractCompositeType) {
        bufs = ((AbstractCompositeType) type).split(key.getKey());
    } else {
        bufs = new ByteBuffer[] { key.getKey() };
    }
    int k = 0;
    for (ColumnDefinition c : pk) {
        where.put(c, Pair.create(Comp.Equal, c.type.compose(bufs[k++])));
    }
    for (Pair<Comp, Object> p : where.values()) {
        params.add(p.right);
    }
    i = 0;
    if (op == Op.INSERT) {
        buf.append('(');
        for (ColumnDefinition c : values.keySet()) {
            if (i++ > 0) {
                buf.append(',');
            }
            buf.append(c.name.toString());
        }
        for (ColumnDefinition c : where.keySet()) {
            if (i++ > 0) {
                buf.append(',');
            }
            buf.append(c.name.toString());
        }
        buf.append(") values (");
        for (i = 0; i < values.size() + where.size(); ++i) {
            if (i > 0) {
                buf.append(',');
            }
            buf.append('?');
        }
        buf.append(')');
        writeUsingTimestamp(buf, params);
        writeUsingTTL(buf, params);
    } else {
        for (Map.Entry<ColumnDefinition, Pair<Comp, Object>> e : where.entries()) {
            if (i++ > 0) {
                buf.append(" AND ");
            }
            buf.append(e.getKey().name.toString());
            buf.append(' ');
            buf.append(e.getValue().left.toString());
            buf.append(" ?");
        }
    }
    buf.append(';');
    makeStatement(key, timestamp, buf.toString(), params);
    clear();
}

[Buggy Hunk]
for (Map.Entry<ColumnDefinition, ColumnOp> e : values.entrySet()) {

[Patch]
for (Map.Entry<ColumnDefinition, ColumnOp> e : values.entries()) {

[Demonstration 2]

[Buggy Method]
private String expandVariables(String input) {
    String result = input;
    AbstractProject<?, ?> project = Stapler.getCurrentRequest().findAncestorObject(AbstractProject.class);
    if (input != null) {
        EnvVars envVars;
        try {
            envVars = project.getEnvironment(null, null);
            String userId = User.current().getId();
            envVars.put("USER_ID", userId);
            result = Util.replaceMacro(input, envVars);
        } catch (IOException e) {
            LOGGER.log(Level.SEVERE, e.getMessage(), e);
        } catch (InterruptedException e) {
            LOGGER.log(Level.SEVERE, e.getMessage(), e);
        }
    }
    return result;
}

[Buggy Hunk]
envVars = project.getEnvironment(null, null);

[Patch]
envVars = project.getEnvironment(null, new LogTaskListener(LOGGER, Level.SEVERE));

[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));