jaas/modules/src/main/java/org/apache/karaf/jaas/modules/properties/PropertiesBackingEngine.java [185:212]:
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    public void deleteRole(String username, String role) {
        String[] infos = null;
        StringBuilder userInfoBuffer = new StringBuilder();

        String userInfos = users.get(username);

        //If user already exists, remove the role
        if (userInfos != null && userInfos.length() > 0) {
            infos = userInfos.split(",");
            String password = infos[0];
            userInfoBuffer.append(password);

            for (int i = 1; i < infos.length; i++) {
                if (infos[i] != null && !infos[i].equals(role)) {
                    userInfoBuffer.append(",");
                    userInfoBuffer.append(infos[i]);
                }
            }
            String newUserInfo = userInfoBuffer.toString();
            users.put(username, newUserInfo);
        }

        try {
            users.save();
        } catch (Exception ex) {
            LOGGER.error("Cannot update users file,", ex);
        }
    }
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jaas/modules/src/main/java/org/apache/karaf/jaas/modules/publickey/PublickeyBackingEngine.java [173:200]:
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    public void deleteRole(String username, String role) {
        String[] infos = null;
        StringBuilder userInfoBuffer = new StringBuilder();

        String userInfos = users.get(username);

        //If user already exists, remove the role
        if (userInfos != null && userInfos.length() > 0) {
            infos = userInfos.split(",");
            String password = infos[0];
            userInfoBuffer.append(password);

            for (int i = 1; i < infos.length; i++) {
                if (infos[i] != null && !infos[i].equals(role)) {
                    userInfoBuffer.append(",");
                    userInfoBuffer.append(infos[i]);
                }
            }
            String newUserInfo = userInfoBuffer.toString();
            users.put(username, newUserInfo);
        }

        try {
            users.save();
        } catch (Exception ex) {
            LOGGER.error("Cannot update users file,", ex);
        }
    }
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