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java.net
Class URLClassLoader
java.lang.Object
java.lang.ClassLoader
java.security.SecureClassLoader
java.net.URLClassLoader
-
Direct Known Subclasses:
-
MLet
-
public class
URLClassLoader
-
extends
SecureClassLoader
This class loader is used to load classes and resources from a search path of URLs referring to both JAR files and directories. Any URL that ends with a '/' is assumed to refer to a directory. Otherwise, the URL is assumed to refer to a JAR file which will be opened as needed.
The AccessControlContext of the thread that created the instance of URLClassLoader will be used when subsequently loading classes and resources.
The classes that are loaded are by default granted permission only to access the URLs specified when the URLClassLoader was created.
-
Since:
-
1.2
Constructor Summary
|
URLClassLoader
(
URL
Constructs a new URLClassLoader for the specified URLs using the default delegation parent ClassLoader.
|
URLClassLoader
(
URL
[] urls,
ClassLoader
Constructs a new URLClassLoader for the given URLs.
|
URLClassLoader
(
URL
[] urls,
ClassLoader
parent,
URLStreamHandlerFactory
Constructs a new URLClassLoader for the specified URLs, parent class loader, and URLStreamHandlerFactory.
|
Methods inherited from class java.lang.
ClassLoader
|
clearAssertionStatus
,
defineClass
,
defineClass
,
defineClass
,
defineClass
,
definePackage
,
findLibrary
,
findLoadedClass
,
findSystemClass
,
getPackage
,
getPackages
,
getParent
,
getResource
,
getResources
,
getSystemClassLoader
,
getSystemResource
,
getSystemResourceAsStream
,
getSystemResources
,
loadClass
,
loadClass
,
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
|
URLClassLoader
public URLClassLoader ( URL[] urls,
ClassLoader parent)
-
Constructs a new URLClassLoader for the given URLs. The URLs will be searched in the order specified for classes and resources after first searching in the specified parent class loader.
This class loader is used to load classes and resources from a search path of URLs referring to both JAR files and directories.
Any URL that ends with a '/' is assumed to refer to a directory.
Otherwise, the URL is assumed to refer to a JAR file which will be downloaded and opened as needed.
If there is a security manager, this method first calls the security manager's checkCreateClassLoader method to ensure creation of a class loader is allowed.
-
Parameters:
-
urls - the URLs from which to load classes and resources
-
parent - the parent class loader for delegation
-
Throws:
-
SecurityException
- if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.
-
See Also:
-
SecurityManager.checkCreateClassLoader()
URLClassLoader
public URLClassLoader ( URL[] urls)
-
Constructs a new URLClassLoader for the specified URLs using the default delegation parent ClassLoader. The URLs will be searched in the order specified for classes and resources after first searching in the parent class loader. Any URL that ends with a '/' is assumed to refer to a directory. Otherwise, the URL is assumed to refer to a JAR file which will be downloaded and opened as needed.
If there is a security manager, this method first calls the security manager's checkCreateClassLoader method to ensure creation of a class loader is allowed.
-
Parameters:
-
urls - the URLs from which to load classes and resources
-
Throws:
-
SecurityException
- if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.
-
See Also:
-
SecurityManager.checkCreateClassLoader()
URLClassLoader
public URLClassLoader ( URL[] urls,
ClassLoader parent,
URLStreamHandlerFactory factory)
-
Constructs a new URLClassLoader for the specified URLs, parent class loader, and URLStreamHandlerFactory. The parent argument will be used as the parent class loader for delegation. The factory argument will be used as the stream handler factory to obtain protocol handlers when creating new URLs.
If there is a security manager, this method first calls the security manager's checkCreateClassLoader method to ensure creation of a class loader is allowed.
-
Parameters:
-
urls - the URLs from which to load classes and resources
-
parent - the parent class loader for delegation
-
factory - the URLStreamHandlerFactory to use when creating URLs
-
Throws:
-
SecurityException
- if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.
-
See Also:
-
SecurityManager.checkCreateClassLoader()
Method Detail
|
addURL
protected void addURL ( URL url)
-
Appends the specified URL to the list of URLs to search for classes and resources.
-
-
Parameters:
-
url - the URL to be added to the search path of URLs
getURLs
public URL[] getURLs ()
-
Returns the search path of URLs for loading classes and resources. This includes the original list of URLs specified to the constructor, along with any URLs subsequently appended by the addURL() method.
-
-
Returns:
-
the search path of URLs for loading classes and resources.
findClass
protected ClassfindClass ( String name)
throws ClassNotFoundException
-
Finds and loads the class with the specified name from the URL search path. Any URLs referring to JAR files are loaded and opened as needed until the class is found.
-
-
Overrides:
-
findClass
in class
ClassLoader
-
-
Parameters:
-
name - the name of the class
-
Returns:
-
the resulting class
-
Throws:
-
ClassNotFoundException
- if the class could not be found
definePackage
protected PackagedefinePackage ( String name,
Manifest man,
URL url)
throws IllegalArgumentException
-
Defines a new package by name in this ClassLoader. The attributes contained in the specified Manifest will be used to obtain package version and sealing information. For sealed packages, the additional URL specifies the code source URL from which the package was loaded.
-
-
Parameters:
-
name - the package name
-
man - the Manifest containing package version and sealing information
-
url - the code source url for the package, or null if none
-
Returns:
-
the newly defined Package object
-
Throws:
-
IllegalArgumentException
- if the package name duplicates an existing package either in this class loader or one of its ancestors
findResource
public URLfindResource ( String name)
-
Finds the resource with the specified name on the URL search path.
-
-
Overrides:
-
findResource
in class
ClassLoader
-
-
Parameters:
-
name - the name of the resource
-
Returns:
-
a URL for the resource, or null if the resource could not be found.
findResources
public EnumerationfindResources ( String name)
throws IOException
-
Returns an Enumeration of URLs representing all of the resources on the URL search path having the specified name.
-
-
Overrides:
-
findResources
in class
ClassLoader
-
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Parameters:
-
name - the resource name
-
Returns:
-
an Enumeration of URLs
-
Throws:
-
IOException
- if an I/O exception occurs
getResourceAsStream
public InputStreamgetResourceAsStream ( String name)
-
Returns an input stream for reading the specified resource.
The search order is described in the documentation for
ClassLoader.getResource(String)
.
Otherwise, the URL is assumed to refer to a JAR file which will be opened as needed.
Note: Overriding the super class implementation to support resource caching.
The AccessControlContext of the thread that created the instance of URLClassLoader will be used when subsequently loading classes and resources.
-
The classes that are loaded are by default granted permission only to access the URLs specified when the URLClassLoader was created.
-
Overrides:
-
getResourceAsStream
in class
ClassLoader
-
-
Parameters:
-
name - The resource name
-
Returns:
-
An input stream for reading the resource, or
null
if the resource could not be found
-
Throws:
-
NullPointerException
- if name is null
-
Since:
-
1.5
1.2
getPermissions
protected PermissionCollectiongetPermissions ( CodeSource codesource)
-
Returns the permissions for the given codesource object. The implementation of this method first calls super.getPermissions and then adds permissions based on the URL of the codesource.
If the protocol is "file" and the path specifies a file, then permission to read that file is granted. If protocol is "file" and the path is a directory, permission is granted to read all files and (recursively) all files and subdirectories contained in that directory.
If the protocol is not "file", then to connect to and accept connections from the URL's host is granted.
-
-
Overrides:
-
getPermissions
in class
SecureClassLoader
-
-
Parameters:
-
codesource - the codesource
-
Returns:
-
the permissions granted to the codesource
newInstance
public static URLClassLoadernewInstance ( URL[] urls,
ClassLoader parent)
-
Creates a new instance of URLClassLoader for the specified URLs and parent class loader. If a security manager is installed, the loadClass method of the URLClassLoader returned by this method will invoke the SecurityManager.checkPackageAccess method before loading the class.
-
-
Parameters:
-
urls - the URLs to search for classes and resources
-
parent - the parent class loader for delegation
-
Returns:
-
the resulting class loader
newInstance
public static URLClassLoadernewInstance ( URL[] urls)
-
Creates a new instance of URLClassLoader for the specified URLs and default parent class loader. If a security manager is installed, the loadClass method of the URLClassLoader returned by this method will invoke the SecurityManager.checkPackageAccess before loading the class.
-
-
Parameters:
-
urls - the URLs to search for classes and resources
-
Returns:
-
the resulting class loader
Constructor Summary
|
URLClassLoader
(
URL
Constructs a new URLClassLoader for the specified URLs using the default delegation parent ClassLoader.
|
URLClassLoader
(
URL
[] urls,
ClassLoader
Constructs a new URLClassLoader for the given URLs.
|
URLClassLoader
(
URL
[] urls,
ClassLoader
parent,
URLStreamHandlerFactory
Constructs a new URLClassLoader for the specified URLs, parent class loader, and URLStreamHandlerFactory.
|
Method Summary
|
protected void
|
addURL
(
URL
Appends the specified URL to the list of URLs to search for classes and resources.
|
protected
Package
|
definePackage
(
String
name,
Manifest
man,
URL
Defines a new package by name in this ClassLoader.
|
protected
Class
|
findClass
(
String
Finds and loads the class with the specified name from the URL search path.
|
URL
|
findResource
(
String
Finds the resource with the specified name on the URL search path.
|
Enumeration
|
findResources
(
String
Returns an Enumeration of URLs representing all of the resources on the URL search path having the specified name.
|
protected
PermissionCollection
|
getPermissions
(
CodeSource
Returns the permissions for the given codesource object.
|
URL
|
getURLs
()
Returns the search path of URLs for loading classes and resources.
|
static
URLClassLoader
|
newInstance
(
URL
Creates a new instance of URLClassLoader for the specified URLs and default parent class loader.
|
static
URLClassLoader
|
newInstance
(
URL
[] urls,
ClassLoader
Creates a new instance of URLClassLoader for the specified URLs and parent class loader.
|
Methods inherited from class java.lang.
ClassLoader
|
clearAssertionStatus
,
defineClass
,
defineClass
,
defineClass
,
definePackage
,
findLibrary
,
findLoadedClass
,
findSystemClass
,
getPackage
,
getPackages
,
getParent
,
getResource
,
getResourceAsStream
,
getResources
,
getSystemClassLoader
,
getSystemResource
,
getSystemResourceAsStream
,
getSystemResources
,
loadClass
,
loadClass
,
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
|
URLClassLoader
public URLClassLoader ( URL[] urls,
ClassLoader parent)
-
Constructs a new URLClassLoader for the given URLs. The URLs will be searched in the order specified for classes and resources after first searching in the specified parent class loader. Any URL that ends with a '/' is assumed to refer to a directory. Otherwise, the URL is assumed to refer to a JAR file which will be downloaded and opened as needed.
If there is a security manager, this method first calls the security manager's checkCreateClassLoader method to ensure creation of a class loader is allowed.
-
Parameters:
-
urls - the URLs from which to load classes and resources
-
parent - the parent class loader for delegation
-
Throws:
-
SecurityException
- if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.
-
See Also:
-
SecurityManager.checkCreateClassLoader()
URLClassLoader
public URLClassLoader ( URL[] urls)
-
Constructs a new URLClassLoader for the specified URLs using the default delegation parent ClassLoader. The URLs will be searched in the order specified for classes and resources after first searching in the parent class loader. Any URL that ends with a '/' is assumed to refer to a directory. Otherwise, the URL is assumed to refer to a JAR file which will be downloaded and opened as needed.
If there is a security manager, this method first calls the security manager's checkCreateClassLoader method to ensure creation of a class loader is allowed.
-
Parameters:
-
urls - the URLs from which to load classes and resources
-
Throws:
-
SecurityException
- if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.
-
See Also:
-
SecurityManager.checkCreateClassLoader()
URLClassLoader
public URLClassLoader ( URL[] urls,
ClassLoader parent,
URLStreamHandlerFactory factory)
-
Constructs a new URLClassLoader for the specified URLs, parent class loader, and URLStreamHandlerFactory. The parent argument will be used as the parent class loader for delegation. The factory argument will be used as the stream handler factory to obtain protocol handlers when creating new URLs.
If there is a security manager, this method first calls the security manager's checkCreateClassLoader method to ensure creation of a class loader is allowed.
-
Parameters:
-
urls - the URLs from which to load classes and resources
-
parent - the parent class loader for delegation
-
factory - the URLStreamHandlerFactory to use when creating URLs
-
Throws:
-
SecurityException
- if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.
-
See Also:
-
SecurityManager.checkCreateClassLoader()
Method Detail
|
addURL
protected void addURL ( URL url)
-
Appends the specified URL to the list of URLs to search for classes and resources.
-
-
Parameters:
-
url - the URL to be added to the search path of URLs
getURLs
public URL[] getURLs ()
-
Returns the search path of URLs for loading classes and resources. This includes the original list of URLs specified to the constructor, along with any URLs subsequently appended by the addURL() method.
-
-
Returns:
-
the search path of URLs for loading classes and resources.
findClass
protected ClassfindClass ( String name)
throws ClassNotFoundException
-
Finds and loads the class with the specified name from the URL search path. Any URLs referring to JAR files are loaded and opened as needed until the class is found.
-
-
Overrides:
-
findClass
in class
ClassLoader
-
-
Parameters:
-
name - the name of the class
-
Returns:
-
the resulting class
-
Throws:
-
ClassNotFoundException
- if the class could not be found
definePackage
protected PackagedefinePackage ( String name,
Manifest man,
URL url)
throws IllegalArgumentException
-
Defines a new package by name in this ClassLoader. The attributes contained in the specified Manifest will be used to obtain package version and sealing information. For sealed packages, the additional URL specifies the code source URL from which the package was loaded.
-
-
Parameters:
-
name - the package name
-
man - the Manifest containing package version and sealing information
-
url - the code source url for the package, or null if none
-
Returns:
-
the newly defined Package object
-
Throws:
-
IllegalArgumentException
- if the package name duplicates an existing package either in this class loader or one of its ancestors
findResource
public URLfindResource ( String name)
-
Finds the resource with the specified name on the URL search path.
-
-
Overrides:
-
findResource
in class
ClassLoader
-
-
Parameters:
-
name - the name of the resource
-
Returns:
-
a URL for the resource, or null if the resource could not be found.
findResources
public EnumerationfindResources ( String name)
throws IOException
-
Returns an Enumeration of URLs representing all of the resources on the URL search path having the specified name.
-
-
Overrides:
-
findResources
in class
ClassLoader
-
-
Parameters:
-
name - the resource name
-
Returns:
-
an Enumeration of URLs
-
Throws:
-
IOException
- if an I/O exception occurs
getPermissions
protected PermissionCollectiongetPermissions ( CodeSource codesource)
-
Returns the permissions for the given codesource object. The implementation of this method first calls super.getPermissions and then adds permissions based on the URL of the codesource.
If the protocol is "file" and the path specifies a file, then permission to read that file is granted. If protocol is "file" and the path is a directory, permission is granted to read all files and (recursively) all files and subdirectories contained in that directory.
If the protocol is not "file", then to connect to and accept connections from the URL's host is granted.
-
-
Overrides:
-
getPermissions
in class
SecureClassLoader
-
-
Parameters:
-
codesource - the codesource
-
Returns:
-
the permissions granted to the codesource
newInstance
public static URLClassLoadernewInstance ( URL[] urls,
ClassLoader parent)
-
Creates a new instance of URLClassLoader for the specified URLs and parent class loader. If a security manager is installed, the loadClass method of the URLClassLoader returned by this method will invoke the SecurityManager.checkPackageAccess method before loading the class.
-
-
Parameters:
-
urls - the URLs to search for classes and resources
-
parent - the parent class loader for delegation
-
Returns:
-
the resulting class loader
newInstance
public static URLClassLoadernewInstance ( URL[] urls)
-
Creates a new instance of URLClassLoader for the specified URLs and default parent class loader. If a security manager is installed, the loadClass method of the URLClassLoader returned by this method will invoke the SecurityManager.checkPackageAccess before loading the class.
-
-
Parameters:
-
urls - the URLs to search for classes and resources
-
Returns:
-
the resulting class loader