Package org.springframework.instrument.classloading

Class ShadowingClassLoader

java.lang.Object

java.lang.ClassLoader

org.springframework.core.DecoratingClassLoader

org.springframework.instrument.classloading.ShadowingClassLoader

Direct Known Subclasses:

ResourceOverridingShadowingClassLoader

public class ShadowingClassLoader
extends DecoratingClassLoader

ClassLoader decorator that shadows an enclosing ClassLoader, applying registered transformers to all affected classes.

Since:

2.0

Author:

Rob Harrop, Juergen Hoeller, Costin Leau

See Also:

• addTransformer(java.lang.instrument.ClassFileTransformer)
• OverridingClassLoader

Field Summary

Fields

Modifier and Type	Field	Description
static final String[]	DEFAULT_EXCLUDED_PACKAGES	Packages that are excluded by default.

Constructor Summary

Constructors

Constructor	Description
ShadowingClassLoader(ClassLoader enclosingClassLoader)	Create a new ShadowingClassLoader, decorating the given ClassLoader, applying DEFAULT_EXCLUDED_PACKAGES.
ShadowingClassLoader(ClassLoader enclosingClassLoader, boolean defaultExcludes)	Create a new ShadowingClassLoader, decorating the given ClassLoader.

Method Summary

Modifier and Type	Method	Description
void	addTransformer(ClassFileTransformer transformer)	Add the given ClassFileTransformer to the list of transformers that this ClassLoader will apply.
void	copyTransformers(ShadowingClassLoader other)	Copy all ClassFileTransformers from the given ClassLoader to the list of transformers that this ClassLoader will apply.
URL	getResource(String name)
InputStream	getResourceAsStream(String name)
Enumeration<URL>	getResources(String name)
protected boolean	isEligibleForShadowing(String className)	Determine whether the specified class is eligible for shadowing by this class loader.
Class<?>	loadClass(String name)

Methods inherited from class org.springframework.core.DecoratingClassLoader

excludeClass, excludePackage, isExcluded

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findClass, findLibrary, findLoadedClass, findResource, findResource, findResources, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_EXCLUDED_PACKAGES

public static final String[] DEFAULT_EXCLUDED_PACKAGES

Packages that are excluded by default.

Constructor Details

ShadowingClassLoader

public ShadowingClassLoader(ClassLoader enclosingClassLoader)

Create a new ShadowingClassLoader, decorating the given ClassLoader, applying DEFAULT_EXCLUDED_PACKAGES.

Parameters:

enclosingClassLoader - the ClassLoader to decorate

See Also:

• ShadowingClassLoader(ClassLoader, boolean)

ShadowingClassLoader

public ShadowingClassLoader(ClassLoader enclosingClassLoader,
 boolean defaultExcludes)

Create a new ShadowingClassLoader, decorating the given ClassLoader.

Parameters:

enclosingClassLoader - the ClassLoader to decorate

defaultExcludes - whether to apply DEFAULT_EXCLUDED_PACKAGES

Since:

4.3.8

Method Details

addTransformer

public void addTransformer(ClassFileTransformer transformer)

Add the given ClassFileTransformer to the list of transformers that this ClassLoader will apply.

Parameters:

transformer - the ClassFileTransformer

copyTransformers

public void copyTransformers(ShadowingClassLoader other)

Copy all ClassFileTransformers from the given ClassLoader to the list of transformers that this ClassLoader will apply.

Parameters:

other - the ClassLoader to copy from

loadClass

public Class<?> loadClass(String name)
                   throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException

isEligibleForShadowing

protected boolean isEligibleForShadowing(String className)

Determine whether the specified class is eligible for shadowing by this class loader.

Parameters:

className - the class name to check

Returns:

whether the specified class is eligible

See Also:

• DecoratingClassLoader.isExcluded(java.lang.String)

getResource

public URL getResource(String name)

Overrides:

getResource in class ClassLoader

getResourceAsStream

@Nullable
public InputStream getResourceAsStream(String name)

Overrides:

getResourceAsStream in class ClassLoader

getResources

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

Overrides:

getResources in class ClassLoader

Throws:

IOException