garbage collection - use JMX(jconsole) to monitor JVM GC.how to get young GC info and full GC info? -


i can " ps scavenge ,ps marksweep" attributes: collectioncount,collectiontime through jmx .but questiong :" 1 young gc info ?which 1 full gc info ? " how can more details on gc.

jstat jstat gc info .the twos different.

the following bean:

import java.io.serializable;  public class performancebean implements serializable {     /**      *       */     private static final long serialversionuid = -6021047939070147624l;      /*      * survivor space 0 utilization percentage of space's current      * capacity.      */     public final long jstats0;      /*      * survivor space 1 utilization percentage of space's current      * capacity.      */     public final long jstats1;      /*      * eden space utilization percentage of space's current capacity.      */      public final long jstate;      /*      * old space utilization percentage of space's current capacity.      */      public final long jstato;     /*      * permanent space utilization percentage of space's current      * capacity.      */     public final long jstatp;      /* number of young generation gc events. */     public final long jstatygc;      /* young generation garbage collection time. */     public final long jstatygct;      /* number of full gc events. */     public final long jstatfgc;      /* full garbage collection time. */     public final long jstatfgct;      /* total garbage collection time. */      public final long jstatgct;      /* operation system info */      public final int availableprocessors;     public final double systemloadaverage;     public final string osname;     public final string arch;      /*      *       * below picture showing example of memory pool:      *<p>      *<pre>      *     +----------------------------------------------+      *     +////////////////           |                  +      *     +////////////////           |                  +      *     +----------------------------------------------+      *      *     |--------|      *            init      *     |---------------|      *            used      *     |---------------------------|      *               committed       *     |----------------------------------------------|      *                           max      *<pre>      */      /*      * memory usage--heapmemoryusage      */     public final long initheap;     public final long usedheap;     public final long committedheap;     public final long maxheap;      /* memory usage--nonheapmemoryusage */     public final long initnonheap;     public final long usednonheap;     public final long committednonheap;     public final long maxnonheap;      public static class builder {         // optional parameters - initialized default values         private long jstats0 = 0;         private long jstats1 = 0;         private long jstate = 0;         private long jstato = 0;         private long jstatp = 0;         private long jstatygc = 0;         private long jstatygct = 0;         private long jstatfgc = 0;         private long jstatfgct = 0;         private long jstatgct = 0;         public int availableprocessors = 0;         public double systemloadaverage = 0;         public string osname = "";         public string arch = "";         private long initheap = 0;         private long usedheap = 0;         private long committedheap = 0;         private long maxheap = 0;         private long initnonheap = 0;         private long usednonheap = 0;         private long committednonheap = 0;         private long maxnonheap = 0;          public builder jstats0(long val) {             jstats0 = val;             return this;         }          public builder jstats1(long val) {             jstats1 = val;             return this;         }          public builder jstate(long val) {             jstate = val;             return this;         }          public builder jstato(long val) {             jstato = val;             return this;         }          public builder jstatp(long val) {             jstatp = val;             return this;         }          public builder jstatygc(long val) {             jstatygc = val;             return this;         }          public builder jstatygct(long val) {             jstatygct = val;             return this;         }          public builder jstatfgc(long val) {             jstatfgc = val;             return this;         }          public builder jstatfgct(long val) {             jstatfgct = val;             return this;         }         public builder jstatgct(long val) {             jstatgct = val;             return this;         }          public builder availableprocessors(int val) {             availableprocessors = val;             return this;         }          public builder systemloadaverage(double val) {             systemloadaverage = val;             return this;         }          public builder arch(string val) {             arch = val;             return this;         }          public builder osname(string val) {             osname = val;             return this;         }          public builder initheap(long val) {             initheap = val;             return this;         }          public builder usedheap(long val) {             usedheap = val;             return this;         }          public builder committedheap(long val) {             committedheap = val;             return this;         }          public builder maxheap(long val) {             maxheap = val;             return this;         }          public builder initnonheap(long val) {             initnonheap = val;             return this;         }          public builder usednonheap(long val) {             usednonheap = val;             return this;         }          public builder committednonheap(long val) {             committednonheap = val;             return this;         }          public builder maxnonheap(long val) {             maxnonheap = val;             return this;         }         public performancebean build(){             return new performancebean(this);         }      }       private performancebean(builder builder) {         jstats0 = builder.jstats0;         jstats1 = builder.jstats1;         jstate = builder.jstate;         jstato = builder.jstato;         jstatp = builder.jstatp;         jstatygc = builder.jstatygc;         jstatygct = builder.jstatygct;         jstatfgc = builder.jstatfgc;         jstatfgct = builder.jstatfgct;         jstatgct = builder.jstatgct;         availableprocessors = builder.availableprocessors;         systemloadaverage = builder.systemloadaverage;         osname = builder.osname;         arch = builder.arch;         initheap = builder.initheap;         usedheap = builder.usedheap;         committedheap = builder.committedheap;         maxheap = builder.maxheap;         initnonheap = builder.initnonheap;         usednonheap = builder.usednonheap;         committednonheap = builder.committednonheap;         maxnonheap = builder.maxnonheap;      }  //  public static long getserialversionuid() { //      return serialversionuid; //  } //  public long getjstats0() { //      return jstats0; //  } //  public long getjstats1() { //      return jstats1; //  } //  public long getjstate() { //      return jstate; //  } //  public long getjstato() { //      return jstato; //  } //  public long getjstatp() { //      return jstatp; //  } //  public long getjstatygc() { //      return jstatygc; //  } //  public long getjstatygct() { //      return jstatygct; //  } //  public long getjstatfgc() { //      return jstatfgc; //  } //  public long getjstatfgct() { //      return jstatfgct; //  } //  public long getjstatgct() { //      return jstatgct; //  } //  public double getsystemloadaverage() { //      return systemloadaverage; //  } //  public string getosname() { //      return osname; //  } //  public string getarch() { //      return arch; //  } //  public long getinitheap() { //      return initheap; //  } //  public long getusedheap() { //      return usedheap; //  } //  public long getcommittedheap() { //      return committedheap; //  } //  public long getmaxheap() { //      return maxheap; //  } //  public long getinitnonheap() { //      return initnonheap; //  } //  public long getusednonheap() { //      return usednonheap; //  } //  public long getcommittednonheap() { //      return committednonheap; //  } //  public long getmaxnonheap() { //      return maxnonheap; //  }  }

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