https://github.com/ejunjsh/classloader-example

this is experiment to know how classloader run
https://github.com/ejunjsh/classloader-example

classloader java

Last synced: 3 months ago
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this is experiment to know how classloader run

• Host: GitHub
• URL: https://github.com/ejunjsh/classloader-example
• Owner: ejunjsh
• Created: 2018-08-21T08:28:32.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-08-21T14:07:52.000Z (over 6 years ago)
• Last Synced: 2024-12-29T08:41:59.382Z (4 months ago)
• Topics: classloader, java
• Language: Java
• Homepage:
• Size: 5.86 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# classloader-example

this is experiment to know how classloader run

# begin

    sudo docker-compose run app

    

then will return a bash ,you run below command

    sh container.sh

    

then the output is 

    # ignore maven build log

    start up the app 1:

    AppClassLoader load applib1

    applib1:

    CommonClassLoader load Calculator

    3

    start up the app 2:

    AppClassLoader load applib2

    applib2:

    4

    

i define two classloader `AppClassLoader` and its parent classloader`CommonClassLoader`, 

the first classloader loads classes in path you specify.

the second classloader loads classes from common path `/opt/cl/common`,so i put the `Calculator` class there

so i execute `container` that run two app `app1` and `app2`

you will see the output they load `calcultor` from `CommonClassLoader` only one time

and use  `AppClassLoader` to load their own  `applib`

for detail you can see the code.

# conclusion

this example is similar with tomcat or some other web container. 

they use `AppClassLoader` to load the different application

but share common library with `CommonClassLoader`.