Java example source code file (MBeanInstantiator.java)
The MBeanInstantiator.java Java example source code/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.jmx.mbeanserver;
import static com.sun.jmx.defaults.JmxProperties.MBEANSERVER_LOGGER;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.Permission;
import java.security.Permissions;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.util.Map;
import java.util.logging.Level;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MBeanPermission;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;
import javax.management.OperationsException;
import javax.management.ReflectionException;
import javax.management.RuntimeErrorException;
import javax.management.RuntimeMBeanException;
import javax.management.RuntimeOperationsException;
import sun.reflect.misc.ConstructorUtil;
import sun.reflect.misc.ReflectUtil;
/**
* Implements the MBeanInstantiator interface. Provides methods for
* instantiating objects, finding the class given its name and using
* different class loaders, deserializing objects in the context of a
* given class loader.
*
* @since 1.5
*/
public class MBeanInstantiator {
private final ModifiableClassLoaderRepository clr;
// private MetaData meta = null;
MBeanInstantiator(ModifiableClassLoaderRepository clr) {
this.clr = clr;
}
/**
* This methods tests if the MBean class makes it possible to
* instantiate an MBean of this class in the MBeanServer.
* e.g. it must have a public constructor, be a concrete class...
*/
public void testCreation(Class<?> c) throws NotCompliantMBeanException {
Introspector.testCreation(c);
}
/**
* Loads the class with the specified name using this object's
* Default Loader Repository.
**/
public Class<?> findClassWithDefaultLoaderRepository(String className)
throws ReflectionException {
Class<?> theClass;
if (className == null) {
throw new RuntimeOperationsException(new
IllegalArgumentException("The class name cannot be null"),
"Exception occurred during object instantiation");
}
ReflectUtil.checkPackageAccess(className);
try {
if (clr == null) throw new ClassNotFoundException(className);
theClass = clr.loadClass(className);
}
catch (ClassNotFoundException ee) {
throw new ReflectionException(ee,
"The MBean class could not be loaded by the default loader repository");
}
return theClass;
}
/**
* Gets the class for the specified class name using the MBean
* Interceptor's classloader
*/
public Class<?> findClass(String className, ClassLoader loader)
throws ReflectionException {
return loadClass(className,loader);
}
/**
* Gets the class for the specified class name using the specified
* class loader
*/
public Class<?> findClass(String className, ObjectName aLoader)
throws ReflectionException, InstanceNotFoundException {
if (aLoader == null)
throw new RuntimeOperationsException(new
IllegalArgumentException(), "Null loader passed in parameter");
// Retrieve the class loader from the repository
ClassLoader loader = null;
synchronized (this) {
loader = getClassLoader(aLoader);
}
if (loader == null) {
throw new InstanceNotFoundException("The loader named " +
aLoader + " is not registered in the MBeanServer");
}
return findClass(className,loader);
}
/**
* Return an array of Class corresponding to the given signature, using
* the specified class loader.
*/
public Class<?>[] findSignatureClasses(String signature[],
ClassLoader loader)
throws ReflectionException {
if (signature == null) return null;
final ClassLoader aLoader = loader;
final int length= signature.length;
final Class<?> tab[]=new Class[length];
if (length == 0) return tab;
try {
for (int i= 0; i < length; i++) {
// Start handling primitive types (int. boolean and so
// forth)
//
final Class<?> primCla = primitiveClasses.get(signature[i]);
if (primCla != null) {
tab[i] = primCla;
continue;
}
ReflectUtil.checkPackageAccess(signature[i]);
// Ok we do not have a primitive type ! We need to build
// the signature of the method
//
if (aLoader != null) {
// We need to load the class through the class
// loader of the target object.
//
tab[i] = Class.forName(signature[i], false, aLoader);
} else {
// Load through the default class loader
//
tab[i] = findClass(signature[i],
this.getClass().getClassLoader());
}
}
} catch (ClassNotFoundException e) {
if (MBEANSERVER_LOGGER.isLoggable(Level.FINEST)) {
MBEANSERVER_LOGGER.logp(Level.FINEST,
MBeanInstantiator.class.getName(),
"findSignatureClasses",
"The parameter class could not be found", e);
}
throw new ReflectionException(e,
"The parameter class could not be found");
} catch (RuntimeException e) {
if (MBEANSERVER_LOGGER.isLoggable(Level.FINEST)) {
MBEANSERVER_LOGGER.logp(Level.FINEST,
MBeanInstantiator.class.getName(),
"findSignatureClasses",
"Unexpected exception", e);
}
throw e;
}
return tab;
}
/**
* Instantiates an object given its class, using its empty constructor.
* The call returns a reference to the newly created object.
*/
public Object instantiate(Class<?> theClass)
throws ReflectionException, MBeanException {
checkMBeanPermission(theClass, null, null, "instantiate");
Object moi;
// ------------------------------
// ------------------------------
Constructor<?> cons = findConstructor(theClass, null);
if (cons == null) {
throw new ReflectionException(new
NoSuchMethodException("No such constructor"));
}
// Instantiate the new object
try {
ReflectUtil.checkPackageAccess(theClass);
ensureClassAccess(theClass);
moi= cons.newInstance();
} catch (InvocationTargetException e) {
// Wrap the exception.
Throwable t = e.getTargetException();
if (t instanceof RuntimeException) {
throw new RuntimeMBeanException((RuntimeException)t,
"RuntimeException thrown in the MBean's empty constructor");
} else if (t instanceof Error) {
throw new RuntimeErrorException((Error) t,
"Error thrown in the MBean's empty constructor");
} else {
throw new MBeanException((Exception) t,
"Exception thrown in the MBean's empty constructor");
}
} catch (NoSuchMethodError error) {
throw new ReflectionException(new
NoSuchMethodException("No constructor"),
"No such constructor");
} catch (InstantiationException e) {
throw new ReflectionException(e,
"Exception thrown trying to invoke the MBean's empty constructor");
} catch (IllegalAccessException e) {
throw new ReflectionException(e,
"Exception thrown trying to invoke the MBean's empty constructor");
} catch (IllegalArgumentException e) {
throw new ReflectionException(e,
"Exception thrown trying to invoke the MBean's empty constructor");
}
return moi;
}
/**
* Instantiates an object given its class, the parameters and
* signature of its constructor The call returns a reference to
* the newly created object.
*/
public Object instantiate(Class<?> theClass, Object params[],
String signature[], ClassLoader loader)
throws ReflectionException, MBeanException {
checkMBeanPermission(theClass, null, null, "instantiate");
// Instantiate the new object
// ------------------------------
// ------------------------------
final Class<?>[] tab;
Object moi;
try {
// Build the signature of the method
//
ClassLoader aLoader= theClass.getClassLoader();
// Build the signature of the method
//
tab =
((signature == null)?null:
findSignatureClasses(signature,aLoader));
}
// Exception IllegalArgumentException raised in Jdk1.1.8
catch (IllegalArgumentException e) {
throw new ReflectionException(e,
"The constructor parameter classes could not be loaded");
}
// Query the metadata service to get the right constructor
Constructor<?> cons = findConstructor(theClass, tab);
if (cons == null) {
throw new ReflectionException(new
NoSuchMethodException("No such constructor"));
}
try {
ReflectUtil.checkPackageAccess(theClass);
ensureClassAccess(theClass);
moi = cons.newInstance(params);
}
catch (NoSuchMethodError error) {
throw new ReflectionException(new
NoSuchMethodException("No such constructor found"),
"No such constructor" );
}
catch (InstantiationException e) {
throw new ReflectionException(e,
"Exception thrown trying to invoke the MBean's constructor");
}
catch (IllegalAccessException e) {
throw new ReflectionException(e,
"Exception thrown trying to invoke the MBean's constructor");
}
catch (InvocationTargetException e) {
// Wrap the exception.
Throwable th = e.getTargetException();
if (th instanceof RuntimeException) {
throw new RuntimeMBeanException((RuntimeException)th,
"RuntimeException thrown in the MBean's constructor");
} else if (th instanceof Error) {
throw new RuntimeErrorException((Error) th,
"Error thrown in the MBean's constructor");
} else {
throw new MBeanException((Exception) th,
"Exception thrown in the MBean's constructor");
}
}
return moi;
}
/**
* De-serializes a byte array in the context of a classloader.
*
* @param loader the classloader to use for de-serialization
* @param data The byte array to be de-sererialized.
*
* @return The de-serialized object stream.
*
* @exception OperationsException Any of the usual Input/Output related
* exceptions.
*/
public ObjectInputStream deserialize(ClassLoader loader, byte[] data)
throws OperationsException {
// Check parameter validity
if (data == null) {
throw new RuntimeOperationsException(new
IllegalArgumentException(), "Null data passed in parameter");
}
if (data.length == 0) {
throw new RuntimeOperationsException(new
IllegalArgumentException(), "Empty data passed in parameter");
}
// Object deserialization
ByteArrayInputStream bIn;
ObjectInputStream objIn;
bIn = new ByteArrayInputStream(data);
try {
objIn = new ObjectInputStreamWithLoader(bIn,loader);
} catch (IOException e) {
throw new OperationsException(
"An IOException occurred trying to de-serialize the data");
}
return objIn;
}
/**
* De-serializes a byte array in the context of a given MBean class loader.
* <P>The class loader is the one that loaded the class with name
* "className".
* <P>The name of the class loader to be used for loading the specified
* class is specified. If null, a default one has to be provided (for a
* MBean Server, its own class loader will be used).
*
* @param className The name of the class whose class loader should
* be used for the de-serialization.
* @param data The byte array to be de-sererialized.
* @param loaderName The name of the class loader to be used for loading
* the specified class. If null, a default one has to be provided (for a
* MBean Server, its own class loader will be used).
*
* @return The de-serialized object stream.
*
* @exception InstanceNotFoundException The specified class loader MBean is
* not found.
* @exception OperationsException Any of the usual Input/Output related
* exceptions.
* @exception ReflectionException The specified class could not be loaded
* by the specified class loader.
*/
public ObjectInputStream deserialize(String className,
ObjectName loaderName,
byte[] data,
ClassLoader loader)
throws InstanceNotFoundException,
OperationsException,
ReflectionException {
// Check parameter validity
if (data == null) {
throw new RuntimeOperationsException(new
IllegalArgumentException(), "Null data passed in parameter");
}
if (data.length == 0) {
throw new RuntimeOperationsException(new
IllegalArgumentException(), "Empty data passed in parameter");
}
if (className == null) {
throw new RuntimeOperationsException(new
IllegalArgumentException(), "Null className passed in parameter");
}
ReflectUtil.checkPackageAccess(className);
Class<?> theClass;
if (loaderName == null) {
// Load the class using the agent class loader
theClass = findClass(className, loader);
} else {
// Get the class loader MBean
try {
ClassLoader instance = null;
instance = getClassLoader(loaderName);
if (instance == null)
throw new ClassNotFoundException(className);
theClass = Class.forName(className, false, instance);
}
catch (ClassNotFoundException e) {
throw new ReflectionException(e,
"The MBean class could not be loaded by the " +
loaderName.toString() + " class loader");
}
}
// Object deserialization
ByteArrayInputStream bIn;
ObjectInputStream objIn;
bIn = new ByteArrayInputStream(data);
try {
objIn = new ObjectInputStreamWithLoader(bIn,
theClass.getClassLoader());
} catch (IOException e) {
throw new OperationsException(
"An IOException occurred trying to de-serialize the data");
}
return objIn;
}
/**
* Instantiates an object using the list of all class loaders registered
* in the MBean Interceptor
* (using its {@link javax.management.loading.ClassLoaderRepository}).
* <P>The object's class should have a public constructor.
* <P>It returns a reference to the newly created object.
* <P>The newly created object is not registered in the MBean Interceptor.
*
* @param className The class name of the object to be instantiated.
*
* @return The newly instantiated object.
*
* @exception ReflectionException Wraps a
* <CODE>java.lang.ClassNotFoundException or the
* <CODE>java.lang.Exception that occurred when trying to invoke the
* object's constructor.
* @exception MBeanException The constructor of the object has thrown an
* exception
* @exception RuntimeOperationsException Wraps a
* <CODE>java.lang.IllegalArgumentException: the className passed in
* parameter is null.
*/
public Object instantiate(String className)
throws ReflectionException,
MBeanException {
return instantiate(className, (Object[]) null, (String[]) null, null);
}
/**
* Instantiates an object using the class Loader specified by its
* <CODE>ObjectName.
* <P>If the loader name is null, a default one has to be provided (for a
* MBean Server, the ClassLoader that loaded it will be used).
* <P>The object's class should have a public constructor.
* <P>It returns a reference to the newly created object.
* <P>The newly created object is not registered in the MBean Interceptor.
*
* @param className The class name of the MBean to be instantiated.
* @param loaderName The object name of the class loader to be used.
*
* @return The newly instantiated object.
*
* @exception ReflectionException Wraps a
* <CODE>java.lang.ClassNotFoundException or the
* <CODE>java.lang.Exception that occurred when trying to invoke the
* object's constructor.
* @exception MBeanException The constructor of the object has thrown an
* exception.
* @exception InstanceNotFoundException The specified class loader is not
* registered in the MBeanServerInterceptor.
* @exception RuntimeOperationsException Wraps a
* <CODE>java.lang.IllegalArgumentException: the className passed in
* parameter is null.
*/
public Object instantiate(String className, ObjectName loaderName,
ClassLoader loader)
throws ReflectionException, MBeanException,
InstanceNotFoundException {
return instantiate(className, loaderName, (Object[]) null,
(String[]) null, loader);
}
/**
* Instantiates an object using the list of all class loaders registered
* in the MBean server
* (using its {@link javax.management.loading.ClassLoaderRepository}).
* <P>The object's class should have a public constructor.
* <P>The call returns a reference to the newly created object.
* <P>The newly created object is not registered in the MBean Interceptor.
*
* @param className The class name of the object to be instantiated.
* @param params An array containing the parameters of the constructor to
* be invoked.
* @param signature An array containing the signature of the constructor to
* be invoked.
*
* @return The newly instantiated object.
*
* @exception ReflectionException Wraps a
* <CODE>java.lang.ClassNotFoundException or the
* <CODE>java.lang.Exception that occurred when trying to invoke the
* object's constructor.
* @exception MBeanException The constructor of the object has thrown an
* exception
* @exception RuntimeOperationsException Wraps a
* <CODE>java.lang.IllegalArgumentException: the className passed in
* parameter is null.
*/
public Object instantiate(String className,
Object params[],
String signature[],
ClassLoader loader)
throws ReflectionException,
MBeanException {
Class<?> theClass = findClassWithDefaultLoaderRepository(className);
return instantiate(theClass, params, signature, loader);
}
/**
* Instantiates an object. The class loader to be used is identified by its
* object name.
* <P>If the object name of the loader is null, a default has to be
* provided (for example, for a MBean Server, the ClassLoader that loaded
* it will be used).
* <P>The object's class should have a public constructor.
* <P>The call returns a reference to the newly created object.
* <P>The newly created object is not registered in the MBean server.
*
* @param className The class name of the object to be instantiated.
* @param params An array containing the parameters of the constructor to
* be invoked.
* @param signature An array containing the signature of the constructor to
* be invoked.
* @param loaderName The object name of the class loader to be used.
*
* @return The newly instantiated object.
*
* @exception ReflectionException Wraps a
* <CODE>java.lang.ClassNotFoundException or the
* <CODE>java.lang.Exception that occurred when trying to invoke the
* object's constructor.
* @exception MBeanException The constructor of the object has thrown an
* exception
* @exception InstanceNotFoundException The specified class loader is not
* registered in the MBean Interceptor.
* @exception RuntimeOperationsException Wraps a
* <CODE>java.lang.IllegalArgumentException: the className passed in
* parameter is null.
*/
public Object instantiate(String className,
ObjectName loaderName,
Object params[],
String signature[],
ClassLoader loader)
throws ReflectionException,
MBeanException,
InstanceNotFoundException {
// ------------------------------
// ------------------------------
Class<?> theClass;
if (loaderName == null) {
theClass = findClass(className, loader);
} else {
theClass = findClass(className, loaderName);
}
return instantiate(theClass, params, signature, loader);
}
/**
* Return the Default Loader Repository used by this instantiator object.
**/
public ModifiableClassLoaderRepository getClassLoaderRepository() {
checkMBeanPermission((String)null, null, null, "getClassLoaderRepository");
return clr;
}
/**
* Load a class with the specified loader, or with this object
* class loader if the specified loader is null.
**/
static Class<?> loadClass(String className, ClassLoader loader)
throws ReflectionException {
Class<?> theClass;
if (className == null) {
throw new RuntimeOperationsException(new
IllegalArgumentException("The class name cannot be null"),
"Exception occurred during object instantiation");
}
ReflectUtil.checkPackageAccess(className);
try {
if (loader == null)
loader = MBeanInstantiator.class.getClassLoader();
if (loader != null) {
theClass = Class.forName(className, false, loader);
} else {
theClass = Class.forName(className);
}
} catch (ClassNotFoundException e) {
throw new ReflectionException(e,
"The MBean class could not be loaded");
}
return theClass;
}
/**
* Load the classes specified in the signature with the given loader,
* or with this object class loader.
**/
static Class<?>[] loadSignatureClasses(String signature[],
ClassLoader loader)
throws ReflectionException {
if (signature == null) return null;
final ClassLoader aLoader =
(loader==null?MBeanInstantiator.class.getClassLoader():loader);
final int length= signature.length;
final Class<?> tab[]=new Class[length];
if (length == 0) return tab;
try {
for (int i= 0; i < length; i++) {
// Start handling primitive types (int. boolean and so
// forth)
//
final Class<?> primCla = primitiveClasses.get(signature[i]);
if (primCla != null) {
tab[i] = primCla;
continue;
}
// Ok we do not have a primitive type ! We need to build
// the signature of the method
//
// We need to load the class through the class
// loader of the target object.
//
ReflectUtil.checkPackageAccess(signature[i]);
tab[i] = Class.forName(signature[i], false, aLoader);
}
} catch (ClassNotFoundException e) {
if (MBEANSERVER_LOGGER.isLoggable(Level.FINEST)) {
MBEANSERVER_LOGGER.logp(Level.FINEST,
MBeanInstantiator.class.getName(),
"findSignatureClasses",
"The parameter class could not be found", e);
}
throw new ReflectionException(e,
"The parameter class could not be found");
} catch (RuntimeException e) {
if (MBEANSERVER_LOGGER.isLoggable(Level.FINEST)) {
MBEANSERVER_LOGGER.logp(Level.FINEST,
MBeanInstantiator.class.getName(),
"findSignatureClasses",
"Unexpected exception", e);
}
throw e;
}
return tab;
}
private Constructor<?> findConstructor(Class c, Class[] params) {
try {
return ConstructorUtil.getConstructor(c, params);
} catch (Exception e) {
return null;
}
}
private static final Map<String, Class primitiveClasses = Util.newMap();
static {
for (Class<?> c : new Class[] {byte.class, short.class, int.class,
long.class, float.class, double.class,
char.class, boolean.class})
primitiveClasses.put(c.getName(), c);
}
private static void checkMBeanPermission(Class<?> clazz,
String member,
ObjectName objectName,
String actions) {
if (clazz != null) {
checkMBeanPermission(clazz.getName(), member, objectName, actions);
}
}
private static void checkMBeanPermission(String classname,
String member,
ObjectName objectName,
String actions)
throws SecurityException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
Permission perm = new MBeanPermission(classname,
member,
objectName,
actions);
sm.checkPermission(perm);
}
}
private static void ensureClassAccess(Class clazz)
throws IllegalAccessException
{
int mod = clazz.getModifiers();
if (!Modifier.isPublic(mod)) {
throw new IllegalAccessException("Class is not public and can't be instantiated");
}
}
private ClassLoader getClassLoader(final ObjectName name) {
if(clr == null){
return null;
}
// Restrict to getClassLoader permission only
Permissions permissions = new Permissions();
permissions.add(new MBeanPermission("*", null, name, "getClassLoader"));
ProtectionDomain protectionDomain = new ProtectionDomain(null, permissions);
ProtectionDomain[] domains = {protectionDomain};
AccessControlContext ctx = new AccessControlContext(domains);
ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
return clr.getClassLoader(name);
}
}, ctx);
return loader;
}
}
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