Programmer Think

1. The concept of locks in JAVA Spin Lock: When a thread acquires a lock, if the lock has already been acquired by another thread, the thread will wait in a loop and constantly determine if the lock can be acquired successfully until it is acquired. Optimistic lock: If there is no conflict, read the latest data when modifying the data and ...

Local variable table As we know, the start of a method call is equivalent to the stack frame's stack in and out of the Java virtual machine stack. Stack frame includes local variable table, operand stack, dynamic link, return address, etc. Figure below: each thread corresponds to a Java virtual machine stack. There are many stack frames in t ...

order This paper focuses on the JVM receiver plugin of skywalking JVMModuleProvider skywalking-6.6.0/oap-server/server-receiver-plugin/skywalking-jvm-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/jvm/provider/JVMModuleProvider.java public class JVMModuleProvider extends ModuleProvider { @Override public String nam ...

In this article, see how to use the OpenJ9 JVM with Quarkus applications and see the memory usage results. Talk about those things in detail According to the definition on the home page, Quarkus is "Kubernetes native Java stack customized for OpenJDK HotSpot and grailvm". Since I'm a big fan of OpenJ9, I quickly measured the memory us ...

200316 idea + Maven zero infrastructure java agent project Java Agent(java probe) has existed since jdk1.5, but for most business development javaer s, it is still quite magical and strange; although in actual business development, agent development is rarely involved, but every java development has been used, such as using idea to write a He ...

Catalog 1, Object.c 2, JVM? Clone 3, Shallow copy and deep copy 4, ObjectSynchronizer 1,FastHashCode / identity_hash_value_for 2,get_next_hash 3,inflate / inflate_helper 4,omAlloc / omRelease / omFlush 5,InduceScavenge / deflate_idle_monitors / deflate_monitor / walk_monitor_list 6,wait / n ...

Original address: http://www.work100.net/training/java-polymorphism.htmlMore Tutorials: Beam Cloud - Free Course polymorphic Sequence Number Intratext chapters video 1 Summary - 2 virtual function - 3 Implementation of polymorphism - See the navigation section above for reading 1. Overview Polymorphism is the ability of the same be ...

1, Classloader Loading overview of class 1.1 Class loading overview When a program wants to use a class, if the class has not yet been loaded into memory, The system will initialize this class in three steps: loading, connecting and initializing. Load It means to read the class file into memor ...

Details of important methods in Thread and Object classes Overview of methods wait,notify,notifyAll Function and usage: blocking phase, wake-up phase, interrupt encountered It will not wake up until one of the following four conditions occurs Another thread calls the notify() method of this obje ...

1. How many OOM s are common? ①java.lang.StackOverflowError②java.lang.OutOfMemoryError:Java heap space③java.lang.OutOfMemoryError:GC overhead limit exceeded④java.lang.OutOfMemoryError:Direct buffer memory⑤java.lang.OutOfMemoryError:unable to create new native thread⑥java.lang.OutOfMemoryError:Metasp ...