Core Java With OCJP/SCJP:JVM Architecture Part- 4|| nead of customized classloader

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[shubhamagarwal]

There are only 2 GOD's Of Java In India & Maybe Whole World. One is Ramesh Sr From LARA Tech Banglore & Other Is DURGA Sr From DurgaSoftwareSolution Hydrabad. Thanks For The Multiverse GOD Sri Hari Vishnu - He Inspired One Of The GOD To Give Free Education On Blessesd.

[ranveervaghela]

Completed watching on Oct 31, 2024 at 11.05 PM :)

[AadityaKavthekar]

Helpful! Thank you so much, Durga Sir :)

[rockbrand]

Very Very Helpful content.. thank you thank you thank you so much sir

[ankitchauhan]

Various Memory Areas inside JVM - 52:07

[madhusudhanreddy]

If JVM is delegating the class loading responsibility to the any of the three class loaders which will loading the .class files from some path, then there must be a way to tell the JVM that the classes are updated and load the new updated files. But how will the problem is solved by extending the ClassLoader which just loads the .class files in a different way?

[nagasateeshdommety]

Sir, in organization we generally download java (jre and jvm) and run java class with and without updating. We don't write any customized class loaders but still we are seeing updated class file. But acc to this session, default class loader will not load updated class file and from java 1.0 we are able to run updated class file without writing any customized class loader. Please let me know if I am going in wrong direction.

[shankark]

any impact on the performance by this approach?

[thorunitha]

Default class loader : load .class file only once even though we are using multiple times.
After loading .class file if it is modified outside default class loader won't load updated version of class file because .class file already available in method area. Resolve the problem by defining our own customised class loader .
Customized Class loader : Advantage : we can control class loading mechanism based on our requirement. eg: we can load .class file separately every time so that updated version available to our program. It is the child class of java.lang.classloader

Define customized class loader
java.lang.classloader

//override the customclassloader method
public class custclassloader extends classloader{
public class loadclass(String name) throws classNotFoundException
{
check for update and load updated class file and return corresponding class file.

{
}
}
public class Dog
public static void main(String args[])
{
Dog d=new Dog()// default class loader
//customized class loader
customclassloader cl=new customclassloader();
cl.loadclass("Dog");

}
Mainly while going for application server and web application server we cann go for customized class loader.

Memory is required to store information related to class, variable, constructor etc..
Various Memory Area present in JVM:
1) Method
2) Heap
3) stack
4)PC register
5) Native method stack

1)Method Area:
total .class file will be dumped in method area
static variable and constant pool of class will be stored.
Method area can be accessed by multiple thread simultaneously . Hence, it is not thread safe