Examples of java.lang.management.ClassLoadingMXBean

java.lang.management.ClassLoadingMXBean
The management interface for the class loading system of the Java virtual machine.
A Java virtual machine has a single instance of the implementation class of this interface. This instance implementing this interface is an MXBean that can be obtained by calling the {@link ManagementFactory#getClassLoadingMXBean} method orfrom the {@link ManagementFactory#getPlatformMBeanServer platform MBeanServer} method.
The ObjectName for uniquely identifying the MXBean for the class loading system within an MBeanServer is:
{@link ManagementFactory#CLASS_LOADING_MXBEAN_NAME java.lang:type=ClassLoading}
@see JMX Specification. @see Ways to Access MXBeans @author Mandy Chung @version 1.12, 11/17/05 @since 1.5

        System.out.println("FAIL");
        System.exit(1);
    }


    public static void main(String[] args) throws Exception {
        ClassLoadingMXBean classMXBean = ManagementFactory
                .getClassLoadingMXBean();
        if (!classMXBean.isVerbose()) {
            fail();
        }
        Class.forName(args[0]);
        classMXBean.setVerbose(false);
        if (classMXBean.isVerbose()) {
            fail();
        }
        System.out.println(args[1]);
        Class.forName(args[2]);
        classMXBean.setVerbose(true);
        if (!classMXBean.isVerbose()) {
            fail();
        }
        System.out.println(args[3]);
        System.exit(77);
    }

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        return str;
    }


    private static String getCLState() {
        ClassLoadingMXBean clBean = ManagementFactory.getClassLoadingMXBean();
        String str = "CLASSES: ";


        long total = clBean.getTotalLoadedClassCount();
        str += "[Loaded: " + total;


        long unloaded = clBean.getUnloadedClassCount();
        str += ", Unloaded: " + unloaded;


        str += ", Left: " + (total - unloaded);


        str += "]";

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    static void createRuntimeProps(MemberStateImpl memberState) {
        Runtime runtime = Runtime.getRuntime();
        ThreadMXBean threadMxBean = ManagementFactory.getThreadMXBean();
        RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
        ClassLoadingMXBean clMxBean = ManagementFactory.getClassLoadingMXBean();
        MemoryMXBean memoryMxBean = ManagementFactory.getMemoryMXBean();
        MemoryUsage heapMemory = memoryMxBean.getHeapMemoryUsage();
        MemoryUsage nonHeapMemory = memoryMxBean.getNonHeapMemoryUsage();
        Map<String, Long> map = new HashMap<String, Long>();
        map.put("runtime.availableProcessors", Integer.valueOf(runtime.availableProcessors()).longValue());
        map.put("date.startTime", runtimeMxBean.getStartTime());
        map.put("seconds.upTime", runtimeMxBean.getUptime());
        map.put("memory.maxMemory", runtime.maxMemory());
        map.put("memory.freeMemory", runtime.freeMemory());
        map.put("memory.totalMemory", runtime.totalMemory());
        map.put("memory.heapMemoryMax", heapMemory.getMax());
        map.put("memory.heapMemoryUsed", heapMemory.getUsed());
        map.put("memory.nonHeapMemoryMax", nonHeapMemory.getMax());
        map.put("memory.nonHeapMemoryUsed", nonHeapMemory.getUsed());
        map.put("runtime.totalLoadedClassCount", clMxBean.getTotalLoadedClassCount());
        map.put("runtime.loadedClassCount", Integer.valueOf(clMxBean.getLoadedClassCount()).longValue());
        map.put("runtime.unloadedClassCount", clMxBean.getUnloadedClassCount());
        map.put("runtime.totalStartedThreadCount", threadMxBean.getTotalStartedThreadCount());
        map.put("runtime.threadCount", Integer.valueOf(threadMxBean.getThreadCount()).longValue());
        map.put("runtime.peakThreadCount", Integer.valueOf(threadMxBean.getPeakThreadCount()).longValue());
        map.put("runtime.daemonThreadCount", Integer.valueOf(threadMxBean.getDaemonThreadCount()).longValue());

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        addThreadMetrics(now, metrics);
        return metrics.getList();
    }


    private void addClassLoadingMetrics(long timestamp, MetricList metrics) {
        ClassLoadingMXBean bean = ManagementFactory.getClassLoadingMXBean();
        metrics.add(new Metric(LOADED_CLASS_COUNT,
                timestamp, bean.getLoadedClassCount()));
        metrics.add(new Metric(TOTAL_LOADED_CLASS_COUNT,
                timestamp, bean.getTotalLoadedClassCount()));
        metrics.add(new Metric(UNLOADED_CLASS_COUNT,
                timestamp, bean.getUnloadedClassCount()));
    }

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  /**
   * Add class loading metrics.
   */
  protected void addClassLoadingMetrics(Collection<Metric<?>> result) {
    ClassLoadingMXBean classLoadingMxBean = ManagementFactory.getClassLoadingMXBean();
    result.add(new Metric<Long>("classes", (long) classLoadingMxBean
        .getLoadedClassCount()));
    result.add(new Metric<Long>("classes.loaded", classLoadingMxBean
        .getTotalLoadedClassCount()));
    result.add(new Metric<Long>("classes.unloaded", classLoadingMxBean
        .getUnloadedClassCount()));
  }

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        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
        OperatingSystemMXBean os = ManagementFactory.getOperatingSystemMXBean();
        ThreadMXBean threads = ManagementFactory.getThreadMXBean();
        MemoryMXBean mem = ManagementFactory.getMemoryMXBean();
        ClassLoadingMXBean cl = ManagementFactory.getClassLoadingMXBean();


        //
        // print Karaf informations
        //
        maxNameLen = 25;
        System.out.println("Karaf");
        printValue("Karaf home", maxNameLen, System.getProperty("karaf.home"));
        printValue("Karaf base", maxNameLen, System.getProperty("karaf.base"));
        printValue("OSGi Framework", maxNameLen, bundleContext.getBundle(0).getSymbolicName() + " - " +
            bundleContext.getBundle(0).getVersion());
        System.out.println();


        System.out.println("JVM");
        printValue("Java Virtual Machine", maxNameLen, runtime.getVmName() + " version " + runtime.getVmVersion());
        printValue("Vendor", maxNameLen, runtime.getVmVendor());
        printValue("Uptime", maxNameLen, printDuration(runtime.getUptime()));
        try {
            printValue("Process CPU time", maxNameLen, printDuration(getSunOsValueAsLong(os, "getProcessCpuTime") / 1000000));
        } catch (Throwable t) {}
        printValue("Total compile time", maxNameLen, printDuration(ManagementFactory.getCompilationMXBean().getTotalCompilationTime()));


        System.out.println("Threads");
        printValue("Live threads", maxNameLen, Integer.toString(threads.getThreadCount()));
        printValue("Daemon threads", maxNameLen, Integer.toString(threads.getDaemonThreadCount()));
        printValue("Peak", maxNameLen, Integer.toString(threads.getPeakThreadCount()));
        printValue("Total started", maxNameLen, Long.toString(threads.getTotalStartedThreadCount()));


        System.out.println("Memory");
        printValue("Current heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getUsed()));
        printValue("Maximum heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getMax()));
        printValue("Committed heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getCommitted()));
        printValue("Pending objects", maxNameLen, Integer.toString(mem.getObjectPendingFinalizationCount()));
        for (GarbageCollectorMXBean gc : ManagementFactory.getGarbageCollectorMXBeans()) {
            String val = "Name = '" + gc.getName() + "', Collections = " + gc.getCollectionCount() + ", Time = " + printDuration(gc.getCollectionTime());
            printValue("Garbage collector", maxNameLen, val);
        }


        System.out.println("Classes");
        printValue("Current classes loaded", maxNameLen, printLong(cl.getLoadedClassCount()));
        printValue("Total classes loaded", maxNameLen, printLong(cl.getTotalLoadedClassCount()));
        printValue("Total classes unloaded", maxNameLen, printLong(cl.getUnloadedClassCount()));


        System.out.println("Operating system");
        printValue("Name", maxNameLen, os.getName() + " version " + os.getVersion());
        printValue("Architecture", maxNameLen, os.getArch());
        printValue("Processors", maxNameLen, Integer.toString(os.getAvailableProcessors()));

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        RuntimeMXBean         runtime = ManagementFactory.getRuntimeMXBean();
        OperatingSystemMXBean os = ManagementFactory.getOperatingSystemMXBean();
        ThreadMXBean          threads = ManagementFactory.getThreadMXBean();
        MemoryMXBean          mem = ManagementFactory.getMemoryMXBean();
        ClassLoadingMXBean    cl = ManagementFactory.getClassLoadingMXBean();


        //
        // print ServiceMix informations
        //
        maxNameLen = 25;
        io.out.println("ServiceMix");
        printValue("ServiceMix home", maxNameLen, System.getProperty("servicemix.home"));
        printValue("ServiceMix base", maxNameLen, System.getProperty("servicemix.base"));
        printValue("ServiceMix version", maxNameLen, branding.getVersion());
        io.out.println();


        io.out.println("JVM");
        printValue("Java Virtual Machine", maxNameLen, runtime.getVmName() + " version " + runtime.getVmVersion());
        printValue("Vendor", maxNameLen, runtime.getVmVendor());
        printValue("Uptime", maxNameLen, printDuration(runtime.getUptime()));
        try {
            com.sun.management.OperatingSystemMXBean sunOs = (com.sun.management.OperatingSystemMXBean) os;
            printValue("Process CPU time", maxNameLen, printDuration(sunOs.getProcessCpuTime() / 1000000));
            printValue("Total compile time", maxNameLen, printDuration(ManagementFactory.getCompilationMXBean().getTotalCompilationTime()));
        } catch (Throwable t) {}


        io.out.println("Threads");
        printValue("Live threads", maxNameLen, Integer.toString(threads.getThreadCount()));
        printValue("Daemon threads", maxNameLen, Integer.toString(threads.getDaemonThreadCount()));
        printValue("Peak", maxNameLen, Integer.toString(threads.getPeakThreadCount()));
        printValue("Total started", maxNameLen, Long.toString(threads.getTotalStartedThreadCount()));


        io.out.println("Memory");
        printValue("Current heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getUsed()));
        printValue("Maximum heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getMax()));
        printValue("Committed heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getCommitted()));
        printValue("Pending objects", maxNameLen, Integer.toString(mem.getObjectPendingFinalizationCount()));
        for (GarbageCollectorMXBean gc : ManagementFactory.getGarbageCollectorMXBeans()) {
            String val = "Name = '" + gc.getName() + "', Collections = " + gc.getCollectionCount() + ", Time = " + printDuration(gc.getCollectionTime());
            printValue("Garbage collector", maxNameLen, val);
        }


        io.out.println("Classes");
        printValue("Current classes loaded", maxNameLen, printLong(cl.getLoadedClassCount()));
        printValue("Total classes loaded", maxNameLen, printLong(cl.getTotalLoadedClassCount()));
        printValue("Total classes unloaded", maxNameLen, printLong(cl.getUnloadedClassCount()));


        io.out.println("Operating system");
        printValue("Name", maxNameLen, os.getName() + " version " + os.getVersion());
        printValue("Architecture", maxNameLen, os.getArch());
        printValue("Processors", maxNameLen, Integer.toString(os.getAvailableProcessors()));

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        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
        OperatingSystemMXBean os = ManagementFactory.getOperatingSystemMXBean();
        ThreadMXBean threads = ManagementFactory.getThreadMXBean();
        MemoryMXBean mem = ManagementFactory.getMemoryMXBean();
        ClassLoadingMXBean cl = ManagementFactory.getClassLoadingMXBean();


        //
        // print Karaf informations
        //
        maxNameLen = 25;
        System.out.println("Karaf");
        printValue("Karaf version", maxNameLen, System.getProperty("karaf.version"));
        printValue("Karaf home", maxNameLen, System.getProperty("karaf.home"));
        printValue("Karaf base", maxNameLen, System.getProperty("karaf.base"));
        String osgi = getOsgiFramework();
        if (osgi != null) {
            printValue("OSGi Framework", maxNameLen, osgi);
        }
        System.out.println();


        System.out.println("JVM");
        printValue("Java Virtual Machine", maxNameLen, runtime.getVmName() + " version " + runtime.getVmVersion());
        printValue("Version", maxNameLen, System.getProperty("java.version"));
        printValue("Vendor", maxNameLen, runtime.getVmVendor());
        printValue("Pid", maxNameLen, getPid());
        printValue("Uptime", maxNameLen, printDuration(runtime.getUptime()));
        try {
            printValue("Process CPU time", maxNameLen, printDuration(getSunOsValueAsLong(os, "getProcessCpuTime") / 1000000));
        } catch (Throwable t) {
        }
        printValue("Total compile time", maxNameLen, printDuration(ManagementFactory.getCompilationMXBean().getTotalCompilationTime()));


        System.out.println("Threads");
        printValue("Live threads", maxNameLen, Integer.toString(threads.getThreadCount()));
        printValue("Daemon threads", maxNameLen, Integer.toString(threads.getDaemonThreadCount()));
        printValue("Peak", maxNameLen, Integer.toString(threads.getPeakThreadCount()));
        printValue("Total started", maxNameLen, Long.toString(threads.getTotalStartedThreadCount()));


        System.out.println("Memory");
        printValue("Current heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getUsed()));
        printValue("Maximum heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getMax()));
        printValue("Committed heap size", maxNameLen, printSizeInKb(mem.getHeapMemoryUsage().getCommitted()));
        printValue("Pending objects", maxNameLen, Integer.toString(mem.getObjectPendingFinalizationCount()));
        for (GarbageCollectorMXBean gc : ManagementFactory.getGarbageCollectorMXBeans()) {
            String val = "Name = '" + gc.getName() + "', Collections = " + gc.getCollectionCount() + ", Time = " + printDuration(gc.getCollectionTime());
            printValue("Garbage collector", maxNameLen, val);
        }


        System.out.println("Classes");
        printValue("Current classes loaded", maxNameLen, printLong(cl.getLoadedClassCount()));
        printValue("Total classes loaded", maxNameLen, printLong(cl.getTotalLoadedClassCount()));
        printValue("Total classes unloaded", maxNameLen, printLong(cl.getUnloadedClassCount()));


        System.out.println("Operating system");
        printValue("Name", maxNameLen, os.getName() + " version " + os.getVersion());
        printValue("Architecture", maxNameLen, os.getArch());
        printValue("Processors", maxNameLen, Integer.toString(os.getAvailableProcessors()));

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        outPW.printf(INDENT_KEY_VALUE_FORMAT, "peak", formatLong(mxBean.getPeakThreadCount())).println();
        outPW.printf(INDENT_KEY_VALUE_FORMAT, "total", formatLong(mxBean.getTotalStartedThreadCount())).println();
    }


    private void dumpClassesInformation(final PrintWriter outPW) {
        final ClassLoadingMXBean mxBean = ManagementFactory.getClassLoadingMXBean();
        if( null == mxBean) {
            return;
        }
        outPW.println("Classes:");
        outPW.printf(INDENT_KEY_VALUE_FORMAT, "loaded", formatLong(mxBean.getLoadedClassCount())).println();
        outPW.printf(INDENT_KEY_VALUE_FORMAT, "total", formatLong(mxBean.getTotalLoadedClassCount())).println();
        outPW.printf(INDENT_KEY_VALUE_FORMAT, "unloaded", formatLong(mxBean.getUnloadedClassCount())).println();
    }

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