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1. Serialization and deserialization Sequencing: refers to the storage of Java object data in heap memory to disk files or to nodes of other networks in some way. We call this process serialization.Deserialization: The process of restoring object data from disk files or from network nodes to Java objects.Why serialization? In a distributed s ...

1: Description of processes and threads: Processes: Each process has its own code and data space (process context), and switching between processes can be costly, with 1 to n threads per process.(Process is the smallest unit of resource allocation) Threads: The same type of thread shares code and data space, each thread has its own run stack an ...

Recently, we were looking for an out-of-heap memory leak problem. Through - XX: MaxDirectMemory Size, we still couldn't control the increase of out-of-heap memory until the machine's physical memory was full and oom killer. Last article Settings for MaxDirectMemorySize MaxDirectMemorySize restricts the memory application of DirectByteBuffer, bu ...

jvm tools are often used in java applications for some operations. If a java application is deployed in a docker container, how do you use jvm tools? First, look at the docker image used. For example, common openjdk mirrors are divided into jdk and jre. Only the jdk version has jvm tools, so you can use the jdk version of openjdk directly. ...

From: https://www.cnblogs.com/ityouknow/p/5714703.html Using the command of JVM can help us locate the problem easily in production monitoring and printing the log information of stack. Although there are many mature tools for JVM tuning: jconsole, famous Visual VM, IBM's Memory Analyzer and so on, when problems arise in the production environ ...

Catalog Registration of ClassPathXml Application Context Loading parent and child containers Configuration Path Analysis Container refresh Refresh Pretreatment of Refresh Container Registration of ClassPathXml Application Context Source code analysis based on Sprin ...

static keyword explanation of Java development, no more nonsense, directly on the code First, template class, which includes: member variables, static variables, common code blocks, static code blocks, common methods, static methods, constructors, static internal classes (including: member variables, static variables, common code blocks, stat ...

Statistical strings for each different character import java.util.*; //Statistics of the number of words per character in a string public class StringDemo{ public static void main(String[] args){ Scanner aScanner = new Scanner(System.in); //Let the user enter a string System.out.println("Please enter the statement you want to co ...

1. What is a GC? Before analyzing memory leaks, you should first understand GC, which is commonly referred to in Java as Garbage Collection, referring to JVM automatically recycling memory data that is not referenced. 2. What is GC Roots? GC Roots is the set of objects currently living in the Java virtual machine, each of which can act as ...

This is from me Mucho Net Handwriting: Very useful Java 8 snippet , please keep the link for upload;) Array (array related) chunk Divides an array into small arrays of a specific size. public static int[][] chunk(int[] numbers, int size) { return IntStream.iterate(0, i -> i + size) .limit((long) Math.ceil((double) numbers.len ...