Class MultipleParentClassLoader

java.lang.Object
java.lang.ClassLoader
net.bytebuddy.dynamic.loading.InjectionClassLoader
net.bytebuddy.dynamic.loading.MultipleParentClassLoader

public class MultipleParentClassLoader extends InjectionClassLoader

This ClassLoader is capable of loading classes from multiple parents. This class loader implicitly defines the bootstrap class loader to be its direct parent as it is required for all class loaders. This can be useful when creating a type that inherits a super type and interfaces that are defined by different, non-compatible class loaders.

Note: Instances of this class loader can have the same class loader as its parent multiple times, either directly or indirectly by multiple parents sharing a common parent class loader. By definition, this implies that the bootstrap class loader is #(direct parents) + 1 times a parent of this class loader. For the ClassLoader.getResources(java.lang.String) method, this means that this class loader might return the same url multiple times by representing the same class loader multiple times.

Important: This class loader does not support the location of packages from its multiple parents. This breaks package equality when loading classes by either loading them directly via this class loader (e.g. by subclassing) or by loading classes with child class loaders of this class loader.

  • Field Details

    • parents

      private final List<? extends ClassLoader> parents
      The parents of this class loader in their application order.
  • Constructor Details

    • MultipleParentClassLoader

      public MultipleParentClassLoader(List<? extends ClassLoader> parents)
      Creates a new class loader with multiple parents.
      Parameters:
      parents - The parents of this class loader in their application order. This list must not contain null, i.e. the bootstrap class loader which is an implicit parent of any class loader.
    • MultipleParentClassLoader

      public MultipleParentClassLoader(@MaybeNull ClassLoader parent, List<? extends ClassLoader> parents)
      Creates a new class loader with multiple parents.
      Parameters:
      parent - An explicit parent in compliance with the class loader API. This explicit parent should only be set if the current platform does not allow creating a class loader that extends the bootstrap loader.
      parents - The parents of this class loader in their application order. This list must not contain null, i.e. the bootstrap class loader which is an implicit parent of any class loader.
    • MultipleParentClassLoader

      public MultipleParentClassLoader(@MaybeNull ClassLoader parent, List<? extends ClassLoader> parents, boolean sealed)
      Creates a new class loader with multiple parents.
      Parameters:
      parent - An explicit parent in compliance with the class loader API. This explicit parent should only be set if the current platform does not allow creating a class loader that extends the bootstrap loader.
      parents - The parents of this class loader in their application order. This list must not contain null, i.e. the bootstrap class loader which is an implicit parent of any class loader.
      sealed - true if the class loader is sealed for injection of additional classes.
  • Method Details