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Description In a well-designed architecture, entity classes typically have a common parent wrapper, tick this option to enable parent class support.If the entity class does not have a parent class, disregard this. Example 　　 do not tick Public class A {} tick public classextends B {} Parent class name Description After you enable the parent class, you must specify the name of the parent class, or the inheritance syntax is incomplete.

example, the address is https://visualvm.github.io/uc/8u131/updates.xml.gzThen, the address in the plugins in the settings, and then available plugin here, you can see the available plug-ins, select the GC plug-in and install.Can come up with a piece of code, and then use JVISUALVM to see the GC situationImport Java.util.arraylist;import java.util.list;/** * Created by Bodhi under the Poplar on 05/09/2017. */public class Oomtest {public static void Main (string[] args) throws Interruptedexce

class= "Hljs-number" >21.917 220 1505.439 1527.355" from the output information can be seen, Eden area memory consumption 100%,old area memory consumption full GC as many times as 220 times, and frequent full GC has a particularly long duration, averaging full GC Time-consuming 6.8 seconds (1505.439/220). Based on this information, you can basically determine that there is a problem with the program code, there may be unreasonable creation of the object where ####3.2, analysis stack using jst

42 21.917 219 1496.567 1518.484 0.00 0.00 100.00 99.99 26.31 42 21.917 220 1505.439 1527.355 0.00 0.00 100.00 99.99 26.31 42 21.917 220 1505.439 1527.355 0.00 0.00 100.00 99.99 26.31 42 21.917 220 1505.439 1527.355From the output information, it can be seen that the Eden area memory occupies the 100%,old area memory occupies 99.99%,full GC up to 220 times, and the frequent full Gc,full GC duration is also particularly long, the average time spent 6