URLClassLoaderpublic class SecureClassLoader extends ClassLoader
ClassLoader with additional support for defining classes with an associated code source and permissions which are retrieved by the system policy by default.| Modifier | Constructor | Description |
|---|---|---|
protected |
Creates a new SecureClassLoader using the default parent class loader for delegation. |
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protected |
Creates a new SecureClassLoader using the specified parent class loader for delegation. |
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protected |
Creates a new SecureClassLoader of the specified name and using the specified parent class loader for delegation. |
| Modifier and Type | Method | Description |
|---|---|---|
protected final Class |
defineClass |
Converts an array of bytes into an instance of class Class, with an optional CodeSource. |
protected final Class |
defineClass |
Converts a ByteBuffer into an instance of class Class, with an optional CodeSource. |
protected PermissionCollection |
getPermissions |
Returns the permissions for the given CodeSource object. |
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
protected SecureClassLoader(ClassLoader parent)
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.
parent - the parent ClassLoaderSecurityException - if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.protected SecureClassLoader()
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.
SecurityException - if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.protected SecureClassLoader(String name, ClassLoader parent)
SecureClassLoader of the specified name and using the specified parent class loader for delegation.name - class loader name; or null if not namedparent - the parent class loaderIllegalArgumentException - if the given name is empty.SecurityException - if a security manager exists and its SecurityManager.checkCreateClassLoader() method doesn't allow creation of a class loader.protected final Class<?> defineClass(String name, byte[] b, int off, int len, CodeSource cs)
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.
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 datalen - the length of the class datacs - the associated CodeSource, or null if noneClass object created from the data, and optional CodeSource.ClassFormatError - if the data did not contain a valid classIndexOutOfBoundsException - 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.".protected final Class<?> defineClass(String name, ByteBuffer b, CodeSource cs)
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.
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 noneClass object created from the data, and optional CodeSource.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.".protected PermissionCollection getPermissions(CodeSource codesource)
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.
codesource - the codesource.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/security/SecureClassLoader.html