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DelegateLastClassLoader
class DelegateLastClassLoader : PathClassLoader
A ClassLoader implementation that implements a delegate last lookup policy. For every class or resource this loader is requested to load, the following lookup order is employed:
- The boot classpath is always searched first
- Then, the list of
dex files associated with this classloaders's dexPath is searched.
- Finally, this classloader will delegate to the specified
parent.
Summary
| Protected methods |
| Class<*>! |
|
Public constructors
DelegateLastClassLoader
DelegateLastClassLoader(
dexPath: String,
librarySearchPath: String?,
parent: ClassLoader?,
delegateResourceLoading: Boolean)
Creates a DelegateLastClassLoader that operates on a given dexPath and a librarySearchPath. The dexPath should consist of one or more of the following, separated by File.pathSeparator, which is ":" on Android.
- JAR/ZIP/APK files, possibly containing a "classes.dex" file as well as arbitrary resources.
- Raw ".dex" files (not inside a zip file).
Unlike
PathClassLoader, this classloader will attempt to locate classes (or resources) using the following lookup order.
- The boot classpath is always searched first.
- Then, the list of
dex files contained in dexPath is searched./li>
- Lastly, this classloader will delegate to the specified
parent.
Note that this is in contrast to other standard classloaders that follow the delegation model. In those classloaders, the
parent is always searched first.
librarySearchPath specifies one more directories containing native library files, separated by
File.pathSeparator.
| Parameters |
dexPath |
String: the list of jar/apk files containing classes and resources, delimited by File.pathSeparator, which defaults to ":" on Android. This value cannot be null. |
librarySearchPath |
String?: the list of directories containing native libraries, delimited by File.pathSeparator; may be null. |
parent |
ClassLoader?: the parent class loader. May be null for the boot classloader. |
delegateResourceLoading |
Boolean: whether to delegate resource loading to the parent if the resource is not found. This does not affect class loading delegation. |
Public methods
getResource
fun getResource(name: String!): URL!
| Parameters |
name |
String!: The resource name |
| Return |
URL! |
URL object for reading the resource; null if the resource could not be found, a URL could not be constructed to locate the resource, the resource is in a package that is not opened unconditionally, or access to the resource is denied by the security manager. |
| Exceptions |
java.lang.NullPointerException |
If name is null |
getResources
fun getResources(name: String!): Enumeration<URL!>!
| Parameters |
name |
String!: The resource name |
| Return |
Enumeration<URL!>! |
An enumeration of URL objects for the resource. If no resources could be found, the enumeration will be empty. Resources for which a URL cannot be constructed, are in a package that is not opened unconditionally, or access to the resource is denied by the security manager, are not returned in the enumeration. |
| Exceptions |
java.io.IOException |
If I/O errors occur |
java.lang.NullPointerException |
If name is null |
Protected methods
loadClass
protected fun loadClass(
name: String!,
resolve: Boolean
): Class<*>!
| Return |
Class<*>! |
The resulting Class object |
| Exceptions |
java.lang.ClassNotFoundException |
If the class could not be found |
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
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