jvm architecture

The full name of the JVM is Java Virtual machine, which shields the software and hardware differences associated with each computer platform.In the days to come, learn the JVM in the form of blogging to make yourself more aware of java!This series is a summary of the in-depth analysis of javaweb Technology Insider and in-depth understanding of Java Virtual Machine, we welcome you to join together to make pr

+ +, not ClassLoader subclass 2) Extension ClassLoader Some jar packages that are responsible for loading extensions in the JAVA platform, including the jar packages in Jre/lib/*.jar or-djava.ext.dirs specified directories in $java_home 3) App ClassLoader Responsible for documenting the jar package and class in the directory specified in Classpath 4) Custom ClassLoader ClassLoader that belong to the application to customize according to their own needs, such as Tomcat, JBoss will be implemented

the object address lost in the stack are cleared), which is the process of garbage collection; for more information about garbage collection, see the previous article JVM Memory Model and garbage collection policy parsing in 51cto. JVM Architecture First, we need to figure out what data is and what commands are. Then we need to figure out the methods of the obje

of bootstrap loader, apart from some basic initialization actions, the most important thing is to load the extclassloader (Extended Class Loader)And set its parent to null, which indicates that its parent loader is bootstraploader.(4) Then bootstrap loader needs to load the appclassloader (User-Defined Class LoaderAnd set its parent to the previously generated extclassloader object. Both loaders exist in the form of static classes.It should be noted that launcher $ extclassloader. Class and lau

initialization actions, the most important thing is to load the extclassloader (Extended Class Loader)And set its parent to null, which indicates that its parent loader is bootstraploader.(4) Then bootstrap loader needs to load the appclassloader (User-Defined Class LoaderAnd set its parent to the previously generated extclassloader object. Both loaders exist in the form of static classes.It should be noted that launcher $ extclassloader. Class and launcher $ appclassloader. Class are both load

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it bluntly, a variable is set, if the value is true, you do not need to perform various lock/unlock procedures. However, there are still many concepts that need to be explained and many introduced problems need to be solved: Why does 3.1 CAS and SMP architecture CAS introduce local latency? Starting from the SMP (symmetric multi-processor) architecture, this probably indicates the SMP structure: it means t

JVM structure BasicsSome time ago, due to the performance problems of the widely-spread String and StringBuffer, I did a few small experiments and came to some conclusions. However, according to the reaction of netizens, the research did not play a proper purpose, moreover, some netizens also put forward their own opinions and pointed out some of the content in the experiment. In response to their reactions, I decompiled the code for comparison, howev

As the assembly must first talk about the principle of computer composition, before starting bytecode, we first understand the main composition of the JVM. Within the JVM, it consists mainly of the following components:1. Data area Method Area: Store class definition information, bytecode, constants and other data, in the Sun HotSpot JVM, this block is a

the stack), which is the garbage collection process; For a more in-depth explanation of garbage collection, refer to the "JVM memory model and garbage collection policy Resolution" article before 51CTO.The architecture of the JVMThe first thing we need to figure out is what the data is and what the instructions are. Then you need to figure out where the object's methods and object properties are stored sep

that are not scanned in the heap are idle. All refresh (actually clears the useless object that lost the object's address in the stack), which is the garbage collection process; For a more in-depth explanation of garbage collection, refer to the "JVM memory model and garbage collection policy Resolution" article before 51CTO.The architecture of the JVMThe first thing we need to figure out is what the data

of the JRE , a fictional computer that is implemented by simulating various computer functions on a real computer. JVM has its own perfect hardware architecture, such as processor, stack, register, etc., also has the corresponding instruction system. The main task of the JVM is to interpret its own instruction set (that is, bytecode) and map it to the local CPU

Java will be a platform rather than a programming language. The original engineers of Java made a wise decision to separate the programming language from the runtime environment, which eventually allowed over 200 languages to run on the Java platform. This architecture is crucial to the long-term vitality of the platform, because the computer programming language generally has a short life cycle. The annual JVM