org.apache.jasper.servlet

Class JasperLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

org.apache.jasper.servlet.JasperLoader

All Implemented Interfaces:

Closeable, AutoCloseable

public class JasperLoader
extends URLClassLoader

Class loader for loading servlet class files (corresponding to JSP files) and tag handler class files (corresponding to tag files).

Author:

Anil K. Vijendran, Harish Prabandham

Constructor Summary

Constructors

Constructor and Description
JasperLoader(URL[] urls, ClassLoader parent, PermissionCollection permissionCollection)

Method Summary

Modifier and Type	Method and Description
PermissionCollection	getPermissions(CodeSource codeSource) Get the Permissions for a CodeSource.
InputStream	getResourceAsStream(String name) Delegate to parent
Class<?>	loadClass(String name) Load the class with the specified name.
Class<?>	loadClass(String name, boolean resolve) Load the class with the specified name, searching using the following algorithm until it finds and returns the class.

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, findClass, findResource, findResources, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, 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

JasperLoader

public JasperLoader(URL[] urls,
                    ClassLoader parent,
                    PermissionCollection permissionCollection)

Method Detail

loadClass

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

Load the class with the specified name. This method searches for classes in the same manner as loadClass(String, boolean) with false as the second argument.

Overrides:

loadClass in class ClassLoader

Parameters:

name - Name of the class to be loaded

Throws:

ClassNotFoundException - if the class was not found

loadClass

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

Load the class with the specified name, searching using the following algorithm until it finds and returns the class. If the class cannot be found, returns ClassNotFoundException.

• Call findLoadedClass(String) to check if the class has already been loaded. If it has, the same Class object is returned.
• If the delegate property is set to true, call the loadClass() method of the parent class loader, if any.
• Call findClass() to find this class in our locally defined repositories.
• Call the loadClass() method of our parent class loader, if any.

If the class was found using the above steps, and the resolve flag is true, this method will then call resolveClass(Class) on the resulting Class object.

Overrides:

loadClass in class ClassLoader

Parameters:

name - Name of the class to be loaded

resolve - If true then resolve the class

Throws:

ClassNotFoundException - if the class was not found

getResourceAsStream

public InputStream getResourceAsStream(String name)

Delegate to parent

Overrides:

getResourceAsStream in class URLClassLoader

See Also:

ClassLoader.getResourceAsStream(java.lang.String)

getPermissions

public final PermissionCollection getPermissions(CodeSource codeSource)

Get the Permissions for a CodeSource. Since this ClassLoader is only used for a JSP page in a web application context, we just return our preset PermissionCollection for the web app context.

Overrides:

getPermissions in class URLClassLoader

Parameters:

codeSource - Code source where the code was loaded from

Returns:

PermissionCollection for CodeSource