jaas/command/src/main/java/org/apache/karaf/jaas/command/UpdateCommand.java [33:50]:
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    public Object execute() throws Exception {
        JaasRealm realm = (JaasRealm) session.get(JAAS_REALM);
        AppConfigurationEntry entry = (AppConfigurationEntry) session.get(JAAS_ENTRY);

        if (realm == null || entry == null) {
            System.err.println("No JAAS Realm/Login Module selected");
            return null;
        }

        BackingEngine engine = getBackingEngine(entry);

        if (engine == null) {
            System.err.println("Can't update the JAAS realm (no backing engine service registered)");
            return null;
        }

        return doExecute(engine);
    }
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jaas/command/src/main/java/org/apache/karaf/jaas/command/ListUsersCommand.java [41:58]:
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    public Object execute() throws Exception {
        JaasRealm realm = (JaasRealm) session.get(JAAS_REALM);
        AppConfigurationEntry entry = (AppConfigurationEntry) session.get(JAAS_ENTRY);

        if (realm == null || entry == null) {
            System.err.println("No JAAS Realm/Login Module has been selected");
            return null;
        }

        BackingEngine engine = getBackingEngine(entry);

        if (engine == null) {
            System.err.println("Can't get the list of users (no backing engine service found)");
            return null;
        }

        return doExecute(engine);
    }
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jaas/command/src/main/java/org/apache/karaf/jaas/command/ListGroupsCommand.java [34:51]:
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    public Object execute() throws Exception {
        JaasRealm realm = (JaasRealm) session.get(JAAS_REALM);
        AppConfigurationEntry entry = (AppConfigurationEntry) session.get(JAAS_ENTRY);

        if (realm == null || entry == null) {
            System.err.println("No JAAS Realm / Module has been selected.");
            return null;
        }

        BackingEngine engine = getBackingEngine(entry);

        if (engine == null) {
            System.err.println("Can't get the list of users (no backing engine service registered)");
            return null;
        }

        return doExecute(engine);
    }
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