public void contextInitialized(ServletContextEvent event) {
    List<MemoryPoolMXBean> memoryPools = ManagementFactory.getMemoryPoolMXBeans();
    for (MemoryPoolMXBean memoryPool : memoryPools) {
        if (memoryPool.getName().contains("Perm Gen") && memoryPool.isUsageThresholdSupported()) {
            MemoryUsage memoryUsage = memoryPool.getUsage();
            long max = memoryUsage.getMax();
            long threshold = Math.round(max * 0.98);
            memoryPool.setUsageThreshold(threshold);
        }
    }
}