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, Jean-Francois Arcand

- - ### Constructor Summary

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

  - ### Method Summary

    Methods
    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

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