Java Code Examples for jdk.internal.loader.BootLoader#loadClass()

private Class<?> getPackageInfo() {
    if (packageInfo == null) {
        // find package-info.class defined by loader
        String cn = packageName() + ".package-info";
        Module module = module();
        PrivilegedAction<ClassLoader> pa = module::getClassLoader;
        ClassLoader loader = AccessController.doPrivileged(pa);
        Class<?> c;
        if (loader != null) {
            c = loader.loadClass(module, cn);
        } else {
            c = BootLoader.loadClass(module, cn);
        }

        if (c != null) {
            packageInfo = c;
        } else {
            // store a proxy for the package info that has no annotations
            class PackageInfoProxy {}
            packageInfo = PackageInfoProxy.class;
        }
    }
    return packageInfo;
}
 

private Class<?> getPackageInfo() {
    if (packageInfo == null) {
        // find package-info.class defined by loader
        String cn = packageName() + ".package-info";
        Module module = module();
        PrivilegedAction<ClassLoader> pa = module::getClassLoader;
        ClassLoader loader = AccessController.doPrivileged(pa);
        Class<?> c;
        if (loader != null) {
            c = loader.loadClass(module, cn);
        } else {
            c = BootLoader.loadClass(module, cn);
        }

        if (c != null) {
            packageInfo = c;
        } else {
            // store a proxy for the package info that has no annotations
            class PackageInfoProxy {}
            packageInfo = PackageInfoProxy.class;
        }
    }
    return packageInfo;
}
 

/**
 * Returns the {@code Class} with the given <a href="ClassLoader.html#name">
 * binary name</a> in the given module.
 *
 * <p> This method attempts to locate, load, and link the class or interface.
 * It does not run the class initializer.  If the class is not found, this
 * method returns {@code null}. </p>
 *
 * <p> If the class loader of the given module defines other modules and
 * the given name is a class defined in a different module, this method
 * returns {@code null} after the class is loaded. </p>
 *
 * <p> This method does not check whether the requested class is
 * accessible to its caller. </p>
 *
 * @apiNote
 * This method returns {@code null} on failure rather than
 * throwing a {@link ClassNotFoundException}, as is done by
 * the {@link #forName(String, boolean, ClassLoader)} method.
 * The security check is a stack-based permission check if the caller
 * loads a class in another module.
 *
 * @param  module   A module
 * @param  name     The <a href="ClassLoader.html#name">binary name</a>
 *                  of the class
 * @return {@code Class} object of the given name defined in the given module;
 *         {@code null} if not found.
 *
 * @throws NullPointerException if the given module or name is {@code null}
 *
 * @throws LinkageError if the linkage fails
 *
 * @throws SecurityException
 *         <ul>
 *         <li> if the caller is not the specified module and
 *         {@code RuntimePermission("getClassLoader")} permission is denied; or</li>
 *         <li> access to the module content is denied. For example,
 *         permission check will be performed when a class loader calls
 *         {@link ModuleReader#open(String)} to read the bytes of a class file
 *         in a module.</li>
 *         </ul>
 *
 * @since 9
 * @spec JPMS
 */
@CallerSensitive
public static Class<?> forName(Module module, String name) {
    Objects.requireNonNull(module);
    Objects.requireNonNull(name);

    Class<?> caller = Reflection.getCallerClass();
    if (caller != null && caller.getModule() != module) {
        // if caller is null, Class.forName is the last java frame on the stack.
        // java.base has all permissions
        SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
            sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
        }
    }

    PrivilegedAction<ClassLoader> pa = module::getClassLoader;
    ClassLoader cl = AccessController.doPrivileged(pa);
    if (cl != null) {
        return cl.loadClass(module, name);
    } else {
        return BootLoader.loadClass(module, name);
    }
}
 

/**
 * Returns the {@code Class} with the given <a href="ClassLoader.html#binary-name">
 * binary name</a> in the given module.
 *
 * <p> This method attempts to locate and load the class or interface.
 * It does not link the class, and does not run the class initializer.
 * If the class is not found, this method returns {@code null}. </p>
 *
 * <p> If the class loader of the given module defines other modules and
 * the given name is a class defined in a different module, this method
 * returns {@code null} after the class is loaded. </p>
 *
 * <p> This method does not check whether the requested class is
 * accessible to its caller. </p>
 *
 * @apiNote
 * This method returns {@code null} on failure rather than
 * throwing a {@link ClassNotFoundException}, as is done by
 * the {@link #forName(String, boolean, ClassLoader)} method.
 * The security check is a stack-based permission check if the caller
 * loads a class in another module.
 *
 * @param  module   A module
 * @param  name     The <a href="ClassLoader.html#binary-name">binary name</a>
 *                  of the class
 * @return {@code Class} object of the given name defined in the given module;
 *         {@code null} if not found.
 *
 * @throws NullPointerException if the given module or name is {@code null}
 *
 * @throws LinkageError if the linkage fails
 *
 * @throws SecurityException
 *         <ul>
 *         <li> if the caller is not the specified module and
 *         {@code RuntimePermission("getClassLoader")} permission is denied; or</li>
 *         <li> access to the module content is denied. For example,
 *         permission check will be performed when a class loader calls
 *         {@link ModuleReader#open(String)} to read the bytes of a class file
 *         in a module.</li>
 *         </ul>
 *
 * @jls 12.2 Loading of Classes and Interfaces
 * @jls 12.3 Linking of Classes and Interfaces
 * @since 9
 * @spec JPMS
 */
@CallerSensitive
public static Class<?> forName(Module module, String name) {
    Objects.requireNonNull(module);
    Objects.requireNonNull(name);

    ClassLoader cl;
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
        Class<?> caller = Reflection.getCallerClass();
        if (caller != null && caller.getModule() != module) {
            // if caller is null, Class.forName is the last java frame on the stack.
            // java.base has all permissions
            sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
        }
        PrivilegedAction<ClassLoader> pa = module::getClassLoader;
        cl = AccessController.doPrivileged(pa);
    } else {
        cl = module.getClassLoader();
    }

    if (cl != null) {
        return cl.loadClass(module, name);
    } else {
        return BootLoader.loadClass(module, name);
    }
}