java.lang.Object
java.lang.ClassLoader
java.security.SecureClassLoader
- Direct Known Subclasses:
URLClassLoader
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.- Since:
- 1.2
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Constructor Summary
ConstructorsModifierConstructorDescriptionprotectedCreates a newSecureClassLoaderusing the default parent class loader for delegation.protectedSecureClassLoader(ClassLoader parent) Creates a newSecureClassLoaderusing the specified parent class loader for delegation.protectedSecureClassLoader(String name, ClassLoader parent) Creates a newSecureClassLoaderof the specified name and using the specified parent class loader for delegation. -
Method Summary
Modifier and TypeMethodDescriptionprotected final Class<?> defineClass(String name, byte[] b, int off, int len, CodeSource cs) Converts an array of bytes into an instance of classClass, with an optional CodeSource.protected final Class<?> defineClass(String name, ByteBuffer b, CodeSource cs) Converts aByteBufferinto an instance of classClass, with an optional CodeSource.protected PermissionCollectiongetPermissions(CodeSource codesource) Returns the permissions for the given CodeSource object.Methods declared in class java.lang.ClassLoader
clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findClass, findLibrary, findLoadedClass, findResource, findResource, findResources, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners
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Constructor Details
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SecureClassLoader
Creates a newSecureClassLoaderusing the specified parent class loader for delegation.If there is a security manager, this method first calls the security manager's
checkCreateClassLoadermethod to ensure creation of a class loader is allowed.- Parameters:
parent- the parent ClassLoader- Throws:
SecurityException- if a security manager exists and itscheckCreateClassLoadermethod doesn't allow creation of a class loader.- See Also:
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SecureClassLoader
protected SecureClassLoader()Creates a newSecureClassLoaderusing the default parent class loader for delegation.If there is a security manager, this method first calls the security manager's
checkCreateClassLoadermethod to ensure creation of a class loader is allowed.- Throws:
SecurityException- if a security manager exists and itscheckCreateClassLoadermethod doesn't allow creation of a class loader.- See Also:
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SecureClassLoader
Creates a newSecureClassLoaderof the specified name and using the specified parent class loader for delegation.- Parameters:
name- class loader name; ornullif not namedparent- the parent class loader- Throws:
IllegalArgumentException- if the given name is empty.SecurityException- if a security manager exists and itsSecurityManager.checkCreateClassLoader()method doesn't allow creation of a class loader.- Since:
- 9
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Method Details
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defineClass
Converts an array of bytes into an instance of classClass, 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, ornullif 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 positionsoffthroughoff+len-1should have the format of a valid class file as defined by The Java Virtual Machine Specification.off- the start offset inbof the class datalen- the length of the class datacs- the associated CodeSource, ornullif none- Returns:
- the
Classobject created from the data, and optional CodeSource. - Throws:
ClassFormatError- if the data did not contain a valid classIndexOutOfBoundsException- if eitherofforlenis negative, or ifoff+lenis greater thanb.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.".
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defineClass
Converts aByteBufferinto an instance of classClass, 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, ornullif 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 positionsb.position()throughb.position() + b.limit() -1should have the format of a valid class file as defined by The Java Virtual Machine Specification.cs- the associated CodeSource, ornullif none- Returns:
- the
Classobject created from the data, and optional CodeSource. - Throws:
ClassFormatError- if the data did not contain a valid classSecurityException- 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
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getPermissions
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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