JVM监控

JVM监控项

JVM监控原理

　　JDK的java.lang.management包提供了管理接口，用于监控管理JVM及操作系统。如上图所示，JVM有众多监控项，根据JMX规范，每个监控项用MXBean表示，应用程序通过访问MXBean接口获取监控数据。访问方式分为两种：

1. 直接访问
　　通过静态工厂方法直接获取对应的MXBean，然后获取监控数据；

2. 间接访问
　　通过MBeanServer间接访问MXBean：其它应用程序需要（本地或远程）通过特定的MBeanServerConnection连接到MBeanServer；

代码示例

通过直接访问的方式获取监控的代码示例如下所示：

JVM概述

/** * 类描述：JVM信息工具类 *  * @author ruipeng.lrp * @since 2017/10/23 **/public class JVMInfoUtils {    static private RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();    static private ClassLoadingMXBean classLoad = ManagementFactory.getClassLoadingMXBean();    static private CompilationMXBean compilation = ManagementFactory.getCompilationMXBean();    static private Properties properties = System.getProperties();    // JVM规范名称    static public String getJVMSpecName() {        return runtime.getSpecName();    }    // JVM规范运营商    static public String getJVMSpecVendor() {        return runtime.getSpecVendor();    }    // JVM规范版本    static public String getJVMSpecVersion() {        return runtime.getSpecVersion();    }    // JVM名称    static public String getJVMName() {        return runtime.getVmName();    }    // JVM运营商    static public String getJVMVendor() {        return runtime.getVmVendor();    }    // JVM实现版本    static public String getJVMVersion() {        return runtime.getVmVersion();    }    // JVM启动时间    static public long getJVMStartTimeMs() {        return runtime.getStartTime();    }    // JVM运行时间    static public long getJVMUpTimeMs() {        return runtime.getUptime();    }    // JVM当前加载类总量    static public long getJVMLoadedClassCount() {        return classLoad.getLoadedClassCount();    }    // JVM已卸载类总量    static public long getJVMUnLoadedClassCount() {        return classLoad.getUnloadedClassCount();    }    // JVM从启动到现在加载类总量    static public long getJVMTotalLoadedClassCount() {        return classLoad.getTotalLoadedClassCount();    }    // JIT编译器名称    static public String getJITName() {        return compilation.getName();    }    // JIT总编译时间    static public long getJITTimeMs() {        if (compilation.isCompilationTimeMonitoringSupported()) {            return compilation.getTotalCompilationTime();        }        return -1;    }    // 获取指定key的属性值    static public String getSystemProperty(String key) {        return properties.getProperty(key);    }    static public Properties getSystemProperty() {        return properties;    }}

JVM内存

import java.lang.management.ManagementFactory;import java.lang.management.MemoryMXBean;import java.lang.management.MemoryPoolMXBean;import java.util.List;/** * 类描述：JVM内存信息工具类 *  * @author ruipeng.lrp * @since 2017/10/23 **/public class JVMMemoryUtils {    static private MemoryMXBean memoryMXBean;    static private MemoryPoolMXBean permGenMxBean;    static private MemoryPoolMXBean oldGenMxBean;    static private MemoryPoolMXBean edenSpaceMxBean;    static private MemoryPoolMXBean pSSurvivorSpaceMxBean;    static {        memoryMXBean = ManagementFactory.getMemoryMXBean();        List<MemoryPoolMXBean> list = ManagementFactory.getMemoryPoolMXBeans();        for (MemoryPoolMXBean item : list) {            if ("CMS Perm Gen".equals(item.getName()) //                    || "Perm Gen".equals(item.getName()) //                    || "PS Perm Gen".equals(item.getName()) //                    || "G1 Perm Gen".equals(item.getName()) //            ) {                permGenMxBean = item;            } else if ("CMS Old Gen".equals(item.getName()) //                    || "Tenured Gen".equals(item.getName()) //                    || "PS Old Gen".equals(item.getName()) //                    || "G1 Old Gen".equals(item.getName()) //            ) {                oldGenMxBean = item;            } else if ("Par Eden Space".equals(item.getName()) //                    || "Eden Space".equals(item.getName()) //                    || "PS Eden Space".equals(item.getName()) //                    || "G1 Eden".equals(item.getName()) //            ) {                edenSpaceMxBean = item;            } else if ("Par Survivor Space".equals(item.getName()) //                    || "Survivor Space".equals(item.getName()) //                    || "PS Survivor Space".equals(item.getName()) //                    || "G1 Survivor".equals(item.getName()) //            ) {                pSSurvivorSpaceMxBean = item;            }        }    }// static    // 堆内存-已使用    static public long getHeapMemoryUsed() {        return memoryMXBean.getHeapMemoryUsage().getUsed();    }    // 堆内存-最大值    static public long getHeapMemoryMax() {        return memoryMXBean.getHeapMemoryUsage().getMax();    }    // 堆外内存-已使用    static public long getNonHeapMemoryUsed() {        return memoryMXBean.getNonHeapMemoryUsage().getUsed();    }    // 堆外内存-最大值    static public long getNonHeapMemoryMax() {        return memoryMXBean.getNonHeapMemoryUsage().getMax();    }    // 持久代-已使用    static public long getPermGenUsed() {        return null == permGenMxBean ? 0 : permGenMxBean.getUsage().getUsed();    }    // 持久代-最大值    static public long getPermGenMax() {        return null == permGenMxBean ? 0 : permGenMxBean.getUsage().getMax();    }    // 老年代-已使用    static public long getOldGenUsed() {        return null == oldGenMxBean ? 0 : oldGenMxBean.getUsage().getUsed();    }    // 老年代-最大值    static public long getOldGenMax() {        return null == oldGenMxBean ? 0 : oldGenMxBean.getUsage().getMax();    }    // Eden-已使用    static public long getEdenGenUsed() {        return null == edenSpaceMxBean ? 0 : edenSpaceMxBean.getUsage().getUsed();    }    // Eden-最大值    static public long getEdenGenMax() {        return null == edenSpaceMxBean ? 0 : edenSpaceMxBean.getUsage().getMax();    }    // Survivor-已使用    static public long getSurvivorUsed() {        return null == pSSurvivorSpaceMxBean ? 0 : pSSurvivorSpaceMxBean.getUsage().getUsed();    }    // Survivor-最大值    static public long getSurvivorMax() {        return null == pSSurvivorSpaceMxBean ? 0 : pSSurvivorSpaceMxBean.getUsage().getMax();    }    public static void main(String[] args) {        System.out.println(JVMMemoryUtils.getHeapMemoryMax());        System.out.println(JVMMemoryUtils.getHeapMemoryUsed());        System.out.println(JVMMemoryUtils.getNonHeapMemoryMax());        System.out.println(JVMMemoryUtils.getNonHeapMemoryUsed());        System.out.println(JVMMemoryUtils.getOldGenMax());        System.out.println(JVMMemoryUtils.getOldGenUsed());        System.out.println(JVMMemoryUtils.getPermGenMax());        System.out.println(JVMMemoryUtils.getPermGenUsed());        System.out.println(JVMMemoryUtils.getEdenGenMax());        System.out.println(JVMMemoryUtils.getEdenGenUsed());        System.out.println(JVMMemoryUtils.getSurvivorMax());        System.out.println(JVMMemoryUtils.getSurvivorUsed());    }}

JVM GC

import java.lang.management.GarbageCollectorMXBean;import java.lang.management.ManagementFactory;import java.util.ListIterator;/** * 类描述：JVM GC信息工具类 *  * @author ruipeng.lrp * @since 2017/10/23 **/public class JVMGCUtils {    static private GarbageCollectorMXBean fullGC;    static private GarbageCollectorMXBean youngGC;    static{        for (ListIterator<GarbageCollectorMXBean> iter = ManagementFactory.getGarbageCollectorMXBeans().listIterator(); iter.hasNext();) {            GarbageCollectorMXBean item = iter.next();            if ("ConcurrentMarkSweep".equals(item.getName()) //                || "MarkSweepCompact".equals(item.getName()) //                || "PS MarkSweep".equals(item.getName()) //                || "G1 Old Generation".equals(item.getName()) //                || "Garbage collection optimized for short pausetimes Old Collector".equals(item.getName()) //                || "Garbage collection optimized for throughput Old Collector".equals(item.getName()) //                || "Garbage collection optimized for deterministic pausetimes Old Collector".equals(item.getName()) //            ) {                fullGC = item;            } else if ("ParNew".equals(item.getName()) //                       || "Copy".equals(item.getName()) //                       || "PS Scavenge".equals(item.getName()) //                       || "G1 Young Generation".equals(item.getName()) //                       || "Garbage collection optimized for short pausetimes Young Collector".equals(item.getName()) //                       || "Garbage collection optimized for throughput Young Collector".equals(item.getName()) //                       || "Garbage collection optimized for deterministic pausetimes Young Collector".equals(item.getName()) //            ) {                youngGC = item;            }        }    }//static    //YGC总次数    static public long getYoungGCCollectionCount() {        return youngGC == null ? 0 : youngGC.getCollectionCount();    }    //YGC总时间    static public long getYoungGCCollectionTime() {        return youngGC == null ? 0 : youngGC.getCollectionTime();    }    //FGC总次数    public long getFullGCCollectionCount() {        return fullGC == null ? 0 : fullGC.getCollectionCount();    }    //FGC总次数    public long getFullGCCollectionTime() {        return fullGC == null ? 0 : fullGC.getCollectionTime();    }}

JVM 线程

import java.lang.management.ManagementFactory;import java.lang.management.ThreadMXBean;/** * 类描述：JVM 线程信息工具类 *  * @author ruipeng.lrp * @since 2017/10/23 **/public class JVMThreadUtils {    static private ThreadMXBean threadMXBean;    static {        threadMXBean = ManagementFactory.getThreadMXBean();    }    //Daemon线程总量    static public int getDaemonThreadCount() {        return threadMXBean.getDaemonThreadCount();    }    //当前线程总量    static public int getThreadCount() {        return threadMXBean.getThreadCount();    }    //死锁线程总量    static public int getDeadLockedThreadCount() {        try {            long[] deadLockedThreadIds = threadMXBean.findDeadlockedThreads();            if (deadLockedThreadIds == null) {                return 0;            }            return deadLockedThreadIds.length;        } catch (Exception e) {            throw new IllegalStateException(e.getMessage(), e);        }    }}