java.security

## Class SecureClassLoader

- java.lang.Object
- - java.lang.ClassLoader
  - - java.security.SecureClassLoader

- Direct Known Subclasses:
    URLClassLoader

      public class SecureClassLoader
      extends ClassLoader

  This class extends ClassLoader with additional support for defining classes with an associated code source and permissions which are retrieved by the system policy by default.

- - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `SecureClassLoader()` Creates a new SecureClassLoader using the default parent class loader for delegation.
    `protected` | `SecureClassLoader(ClassLoader parent)` Creates a new SecureClassLoader using the specified parent class loader for delegation.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected Class<?>` | `defineClass(String name, byte[] b, int off, int len, CodeSource cs)` Converts an array of bytes into an instance of class Class, with an optional CodeSource.
    `protected Class<?>` | `defineClass(String name, ByteBuffer b, CodeSource cs)` Converts a ``ByteBuffer`` into an instance of class `Class`, with an optional CodeSource.
    `protected PermissionCollection` | `getPermissions(CodeSource codesource)` Returns the permissions for the given CodeSource object.

    - ### Methods inherited from class java.lang.ClassLoader

      `clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResources, 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

    - #### SecureClassLoader

          protected SecureClassLoader(ClassLoader parent)

      Creates a new SecureClassLoader using the specified parent class loader for delegation.

      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:
        `parent` - the parent ClassLoader
      Throws:
        `SecurityException` - if a security manager exists and its `checkCreateClassLoader` method doesn't allow creation of a class loader.
      See Also:
        `SecurityManager.checkCreateClassLoader()`

    - #### SecureClassLoader

          protected SecureClassLoader()

      Creates a new SecureClassLoader using the default parent class loader for delegation.

      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.

      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

    - #### defineClass

          protected final Class<?> defineClass(String name,
                             byte[] b,
                             int off,
                             int len,
                             CodeSource cs)

      Converts an array of bytes into an instance of class Class, with an optional CodeSource. Before the class can be used it must be resolved.

      If a non-null CodeSource is supplied a ProtectionDomain is constructed and associated with the class being defined.

      Parameters:
        `name` - the expected name of the class, or `null` if not known, using '.' and not '/' as the separator and without a trailing ".class" suffix.
        `b` - the bytes that make up the class data. The bytes in positions `off` through `off+len-1` should have the format of a valid class file as defined by the Java Virtual Machine Specification.
        `off` - the start offset in `b` of the class data
        `len` - the length of the class data
        `cs` - the associated CodeSource, or `null` if none
      Returns:
        the `Class` object created from the data, and optional CodeSource.
      Throws:
        `ClassFormatError` - if the data did not contain a valid class
        `IndexOutOfBoundsException` - if either `off` or `len` is negative, or if `off+len` is greater than `b.length`.
        `SecurityException` - if an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class, or if the class name begins with "java.".

    - #### defineClass

          protected final Class<?> defineClass(String name,
                             ByteBuffer b,
                             CodeSource cs)

      Converts a ``ByteBuffer`` into an instance of class `Class`, with an optional CodeSource. Before the class can be used it must be resolved.

      If a non-null CodeSource is supplied a ProtectionDomain is constructed and associated with the class being defined.

      Parameters:
        `name` - the expected name of the class, or `null` if not known, using '.' and not '/' as the separator and without a trailing ".class" suffix.
        `b` - the bytes that make up the class data. The bytes from positions `b.position()` through `b.position() + b.limit() -1` should have the format of a valid class file as defined by the Java Virtual Machine Specification.
        `cs` - the associated CodeSource, or `null` if none
      Returns:
        the `Class` object created from the data, and optional CodeSource.
      Throws:
        `ClassFormatError` - if the data did not contain a valid class
        `SecurityException` - if an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class, or if the class name begins with "java.".
      Since:
        1.5

    - #### getPermissions

          protected PermissionCollection getPermissions(CodeSource codesource)

      Returns the permissions for the given CodeSource object.

      This method is invoked by the defineClass method which takes a CodeSource as an argument when it is constructing the ProtectionDomain for the class being defined.

      Parameters:
        `codesource` - the codesource.
      Returns:
        the permissions granted to the codesource.

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