#fixed code
                                public final Cache buildCache(String name) throws CacheException {

        if (log.isDebugEnabled()) {
            log.debug("Loading a new EhCache cache named [" + name + "]");
        }

        try {
            net.sf.ehcache.Cache cache = getCacheManager().getCache(name);
            if (cache == null) {
                if (log.isWarnEnabled()) {
                    log.warn("Could not find a specific ehcache configuration for cache named [" + name + "]; using defaults.");
                }
                if ( name.equals(DEFAULT_ACTIVE_SESSIONS_CACHE_NAME) ) {
                    if ( log.isInfoEnabled() ) {
                        log.info("Creating " + DEFAULT_ACTIVE_SESSIONS_CACHE_NAME + " cache with default JSecurity " +
                            "session cache settings." );
                    }
                    cache = buildDefaultActiveSessionsCache();
                    manager.addCache( cache );
                } else {
                    manager.addCache( name );
                    cache = manager.getCache( name );
                }

                if (log.isDebugEnabled()) {
                    log.debug("Started EHCache named [" + name + "]");
                }
            }
            return new EhCache(cache);
        } catch (net.sf.ehcache.CacheException e) {
            throw new CacheException(e);
        }
    }
#vulnerable code 
                                public final Cache buildCache(String name) throws CacheException {

        if (log.isDebugEnabled()) {
            log.debug("Loading a new EhCache cache named [" + name + "]");
        }

        try {
            net.sf.ehcache.Cache cache = getCacheManager().getCache(name);
            if (cache == null) {
                if (log.isWarnEnabled()) {
                    log.warn("Could not find a specific ehcache configuration for cache named [" + name + "]; using defaults.");
                }
                if ( name.equals(DEFAULT_ACTIVE_SESSIONS_CACHE_NAME) ) {
                    if ( log.isInfoEnabled() ) {
                        log.info("Creating " + DEFAULT_ACTIVE_SESSIONS_CACHE_NAME + " cache with default JSecurity " +
                            "session cache settings." );
                    }
                    cache = buildDefaultActiveSessionsCache();
                    manager.addCache( cache );
                } else {
                    manager.addCache( name );
                    cache = manager.getCache( name );
                }
                cache.initialise();

                if (log.isDebugEnabled()) {
                    log.debug("Started EHCache named [" + name + "]");
                }
            }
            return new EhCache(cache);
        } catch (net.sf.ehcache.CacheException e) {
            throw new CacheException(e);
        }
    } 
                            #location 24 
                            #vulnerability type NULL_DEREFERENCE