net.bytebuddy.dynamic.loading

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.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MultipleParentClassLoader.Builder A builder to collect class loader and that creates a MultipleParentClassLoader only if multiple or no ClassLoaders are found in the process.
protected static class	MultipleParentClassLoader.CompoundEnumeration A compound URL enumeration.

Nested classes/interfaces inherited from class net.bytebuddy.dynamic.loading.InjectionClassLoader

InjectionClassLoader.Strategy

Constructor Summary

Constructors

Constructor and Description
MultipleParentClassLoader(ClassLoader parent, List<? extends ClassLoader> parents) Creates a new class loader with multiple parents.
MultipleParentClassLoader(ClassLoader parent, List<? extends ClassLoader> parents, boolean sealed) Creates a new class loader with multiple parents.
MultipleParentClassLoader(List<? extends ClassLoader> parents) Creates a new class loader with multiple parents.

Method Summary

Modifier and Type	Method and Description
protected Map<String,Class<?>>	doDefineClasses(Map<String,byte[]> typeDefinitions) Defines a group of types to be loaded by this class loader.
URL	getResource(String name)
Enumeration<URL>	getResources(String name)
protected Class<?>	loadClass(String name, boolean resolve)

Methods inherited from class net.bytebuddy.dynamic.loading.InjectionClassLoader

defineClass, defineClasses, isSealed, seal

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResourceAsStream, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

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 Detail

loadClass

protected Class<?> loadClass(String name,
                             boolean resolve)
                      throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException

getResource

public URL getResource(String name)

Overrides:

getResource in class ClassLoader

getResources

public Enumeration<URL> getResources(String name)
                              throws IOException

Overrides:

getResources in class ClassLoader

Throws:

IOException

doDefineClasses

protected Map<String,Class<?>> doDefineClasses(Map<String,byte[]> typeDefinitions)

Description copied from class: InjectionClassLoader

Defines a group of types to be loaded by this class loader.

Specified by:

doDefineClasses in class InjectionClassLoader

Parameters:

typeDefinitions - The types binary representations.

Returns:

The mapping of defined classes or previously defined classes by their name.