java17style

Java 17. Manual Loading (Java 17 style)

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Task: load any application class using a custom class loader (CustomClassLoader) in Java 17 style (with module-info.java).

Solution

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Modules (declared via module-info.java):

• manual.onemodule.j17style:
  • Main - a class containing the main method, where an instance of the CustomClassLoader class is created, the Cat class is loaded using it, creating an instance of the class Cat and calling the Cat::talk method;
  • Cat - loadable class with the talk method, which prints the string "Meow" to stdout;
  • CustomClassLoader - a class that is an implementation of a custom class loader.

Run

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Using classpath the results are the same as in Java 17. Manual Loading (Java 8 style).

Using modulepath:

java17 -p . -m manual.onemodule.j17style

Output:

Main Class Module is module manual.onemodule.j17style
Cat Class Module is unnamed module @f6f4d33
Main Class ClassLoader is jdk.internal.loader.ClassLoaders$AppClassLoader@4554617c
Cat Class ClassLoader is ru.ispras.j17.manual.onemodule.j17style.CustomClassLoader@5acf9800
Meow

Explanation

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• Regarding Java 17. Manual Loading (Java 8 style) is different with the module name manual.onemodule. j17style in the jar file, which is anchored with module-info .java, so this module is considered an Application Module, and not an Automatic Module.

Notes

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Same as in Java 17. Manual Loading (Java 8 style).