JRE 8 rt.jar - com.* Package Source Code
JRE 8 rt.jar is the JAR file for JRE 8 RT (Runtime) libraries.
JRE (Java Runtime) 8 is the runtime environment included in JDK 8.
JRE 8 rt.jar libraries are divided into 6 packages:
com.* - Internal Oracle and Sun Microsystems libraries java.* - Standard Java API libraries. javax.* - Extended Java API libraries. jdk.* - JDK supporting libraries. org.* - Third party libraries. sun.* - Old libraries developed by Sun Microsystems.
JAR File Information:
Directory of C:\fyicenter\jdk-1.8.0_191\jre\lib
63,596,151 rt.jar
Here is the list of Java classes of the com.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.
✍: FYIcenter
⏎ com/sun/jmx/remote/internal/ArrayNotificationBuffer.java
/*
* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
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*
*
*
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*
*
*/
package com.sun.jmx.remote.internal;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.HashMap;
import java.util.Map;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanServer;
import javax.management.MBeanServerDelegate;
import javax.management.MBeanServerNotification;
import javax.management.Notification;
import javax.management.NotificationBroadcaster;
import javax.management.NotificationFilter;
import javax.management.NotificationFilterSupport;
import javax.management.NotificationListener;
import javax.management.ObjectName;
import javax.management.QueryEval;
import javax.management.QueryExp;
import javax.management.remote.NotificationResult;
import javax.management.remote.TargetedNotification;
import com.sun.jmx.remote.util.EnvHelp;
import com.sun.jmx.remote.util.ClassLogger;
/** A circular buffer of notifications received from an MBean server. */
/*
There is one instance of ArrayNotificationBuffer for every
MBeanServer object that has an attached ConnectorServer. Then, for
every ConnectorServer attached to a given MBeanServer, there is an
instance of the inner class ShareBuffer. So for example with two
ConnectorServers it looks like this:
ConnectorServer1 -> ShareBuffer1 -\
}-> ArrayNotificationBuffer
ConnectorServer2 -> ShareBuffer2 -/ |
|
v
MBeanServer
The ArrayNotificationBuffer has a circular buffer of
NamedNotification objects. Each ConnectorServer defines a
notification buffer size, and this size is recorded by the
corresponding ShareBuffer. The buffer size of the
ArrayNotificationBuffer is the maximum of all of its ShareBuffers.
When a ShareBuffer is added or removed, the ArrayNotificationBuffer
size is adjusted accordingly.
An ArrayNotificationBuffer also has a BufferListener (which is a
NotificationListener) registered on every NotificationBroadcaster
MBean in the MBeanServer to which it is attached. The cost of this
potentially large set of listeners is the principal motivation for
sharing the ArrayNotificationBuffer between ConnectorServers, and
also the reason that we are careful to discard the
ArrayNotificationBuffer (and its BufferListeners) when there are no
longer any ConnectorServers using it.
The synchronization of this class is inherently complex. In an attempt
to limit the complexity, we use just two locks:
- globalLock controls access to the mapping between an MBeanServer
and its ArrayNotificationBuffer and to the set of ShareBuffers for
each ArrayNotificationBuffer.
- the instance lock of each ArrayNotificationBuffer controls access
to the array of notifications, including its size, and to the
dispose flag of the ArrayNotificationBuffer. The wait/notify
mechanism is used to indicate changes to the array.
If both locks are held at the same time, the globalLock must be
taken first.
Since adding or removing a BufferListener to an MBean can involve
calling user code, we are careful not to hold any locks while it is
done.
*/
public class ArrayNotificationBuffer implements NotificationBuffer {
private boolean disposed = false;
// FACTORY STUFF, INCLUDING SHARING
private static final Object globalLock = new Object();
private static final
HashMap<MBeanServer,ArrayNotificationBuffer> mbsToBuffer =
new HashMap<MBeanServer,ArrayNotificationBuffer>(1);
private final Collection<ShareBuffer> sharers = new HashSet<ShareBuffer>(1);
public static NotificationBuffer getNotificationBuffer(
MBeanServer mbs, Map<String, ?> env) {
if (env == null)
env = Collections.emptyMap();
//Find out queue size
int queueSize = EnvHelp.getNotifBufferSize(env);
ArrayNotificationBuffer buf;
boolean create;
NotificationBuffer sharer;
synchronized (globalLock) {
buf = mbsToBuffer.get(mbs);
create = (buf == null);
if (create) {
buf = new ArrayNotificationBuffer(mbs, queueSize);
mbsToBuffer.put(mbs, buf);
}
sharer = buf.new ShareBuffer(queueSize);
}
/* We avoid holding any locks while calling createListeners.
* This prevents possible deadlocks involving user code, but
* does mean that a second ConnectorServer created and started
* in this window will return before all the listeners are ready,
* which could lead to surprising behaviour. The alternative
* would be to block the second ConnectorServer until the first
* one has finished adding all the listeners, but that would then
* be subject to deadlock.
*/
if (create)
buf.createListeners();
return sharer;
}
/* Ensure that this buffer is no longer the one that will be returned by
* getNotificationBuffer. This method is idempotent - calling it more
* than once has no effect beyond that of calling it once.
*/
static void removeNotificationBuffer(MBeanServer mbs) {
synchronized (globalLock) {
mbsToBuffer.remove(mbs);
}
}
void addSharer(ShareBuffer sharer) {
synchronized (globalLock) {
synchronized (this) {
if (sharer.getSize() > queueSize)
resize(sharer.getSize());
}
sharers.add(sharer);
}
}
private void removeSharer(ShareBuffer sharer) {
boolean empty;
synchronized (globalLock) {
sharers.remove(sharer);
empty = sharers.isEmpty();
if (empty)
removeNotificationBuffer(mBeanServer);
else {
int max = 0;
for (ShareBuffer buf : sharers) {
int bufsize = buf.getSize();
if (bufsize > max)
max = bufsize;
}
if (max < queueSize)
resize(max);
}
}
if (empty) {
synchronized (this) {
disposed = true;
// Notify potential waiting fetchNotification call
notifyAll();
}
destroyListeners();
}
}
private synchronized void resize(int newSize) {
if (newSize == queueSize)
return;
while (queue.size() > newSize)
dropNotification();
queue.resize(newSize);
queueSize = newSize;
}
private class ShareBuffer implements NotificationBuffer {
ShareBuffer(int size) {
this.size = size;
addSharer(this);
}
public NotificationResult
fetchNotifications(NotificationBufferFilter filter,
long startSequenceNumber,
long timeout,
int maxNotifications)
throws InterruptedException {
NotificationBuffer buf = ArrayNotificationBuffer.this;
return buf.fetchNotifications(filter, startSequenceNumber,
timeout, maxNotifications);
}
public void dispose() {
ArrayNotificationBuffer.this.removeSharer(this);
}
int getSize() {
return size;
}
private final int size;
}
// ARRAYNOTIFICATIONBUFFER IMPLEMENTATION
private ArrayNotificationBuffer(MBeanServer mbs, int queueSize) {
if (logger.traceOn())
logger.trace("Constructor", "queueSize=" + queueSize);
if (mbs == null || queueSize < 1)
throw new IllegalArgumentException("Bad args");
this.mBeanServer = mbs;
this.queueSize = queueSize;
this.queue = new ArrayQueue<NamedNotification>(queueSize);
this.earliestSequenceNumber = System.currentTimeMillis();
this.nextSequenceNumber = this.earliestSequenceNumber;
logger.trace("Constructor", "ends");
}
private synchronized boolean isDisposed() {
return disposed;
}
// We no longer support calling this method from outside.
// The JDK doesn't contain any such calls and users are not
// supposed to be accessing this class.
public void dispose() {
throw new UnsupportedOperationException();
}
/**
* <p>Fetch notifications that match the given listeners.</p>
*
* <p>The operation only considers notifications with a sequence
* number at least <code>startSequenceNumber</code>. It will take
* no longer than <code>timeout</code>, and will return no more
* than <code>maxNotifications</code> different notifications.</p>
*
* <p>If there are no notifications matching the criteria, the
* operation will block until one arrives, subject to the
* timeout.</p>
*
* @param filter an object that will add notifications to a
* {@code List<TargetedNotification>} if they match the current
* listeners with their filters.
* @param startSequenceNumber the first sequence number to
* consider.
* @param timeout the maximum time to wait. May be 0 to indicate
* not to wait if there are no notifications.
* @param maxNotifications the maximum number of notifications to
* return. May be 0 to indicate a wait for eligible notifications
* that will return a usable <code>nextSequenceNumber</code>. The
* {@link TargetedNotification} array in the returned {@link
* NotificationResult} may contain more than this number of
* elements but will not contain more than this number of
* different notifications.
*/
public NotificationResult
fetchNotifications(NotificationBufferFilter filter,
long startSequenceNumber,
long timeout,
int maxNotifications)
throws InterruptedException {
logger.trace("fetchNotifications", "starts");
if (startSequenceNumber < 0 || isDisposed()) {
synchronized(this) {
return new NotificationResult(earliestSequenceNumber(),
nextSequenceNumber(),
new TargetedNotification[0]);
}
}
// Check arg validity
if (filter == null
|| startSequenceNumber < 0 || timeout < 0
|| maxNotifications < 0) {
logger.trace("fetchNotifications", "Bad args");
throw new IllegalArgumentException("Bad args to fetch");
}
if (logger.debugOn()) {
logger.trace("fetchNotifications",
"filter=" + filter + "; startSeq=" +
startSequenceNumber + "; timeout=" + timeout +
"; max=" + maxNotifications);
}
if (startSequenceNumber > nextSequenceNumber()) {
final String msg = "Start sequence number too big: " +
startSequenceNumber + " > " + nextSequenceNumber();
logger.trace("fetchNotifications", msg);
throw new IllegalArgumentException(msg);
}
/* Determine the end time corresponding to the timeout value.
Caller may legitimately supply Long.MAX_VALUE to indicate no
timeout. In that case the addition will overflow and produce
a negative end time. Set end time to Long.MAX_VALUE in that
case. We assume System.currentTimeMillis() is positive. */
long endTime = System.currentTimeMillis() + timeout;
if (endTime < 0) // overflow
endTime = Long.MAX_VALUE;
if (logger.debugOn())
logger.debug("fetchNotifications", "endTime=" + endTime);
/* We set earliestSeq the first time through the loop. If we
set it here, notifications could be dropped before we
started examining them, so earliestSeq might not correspond
to the earliest notification we examined. */
long earliestSeq = -1;
long nextSeq = startSequenceNumber;
List<TargetedNotification> notifs =
new ArrayList<TargetedNotification>();
/* On exit from this loop, notifs, earliestSeq, and nextSeq must
all be correct values for the returned NotificationResult. */
while (true) {
logger.debug("fetchNotifications", "main loop starts");
NamedNotification candidate;
/* Get the next available notification regardless of filters,
or wait for one to arrive if there is none. */
synchronized (this) {
/* First time through. The current earliestSequenceNumber
is the first one we could have examined. */
if (earliestSeq < 0) {
earliestSeq = earliestSequenceNumber();
if (logger.debugOn()) {
logger.debug("fetchNotifications",
"earliestSeq=" + earliestSeq);
}
if (nextSeq < earliestSeq) {
nextSeq = earliestSeq;
logger.debug("fetchNotifications",
"nextSeq=earliestSeq");
}
} else
earliestSeq = earliestSequenceNumber();
/* If many notifications have been dropped since the
last time through, nextSeq could now be earlier
than the current earliest. If so, notifications
may have been lost and we return now so the caller
can see this next time it calls. */
if (nextSeq < earliestSeq) {
logger.trace("fetchNotifications",
"nextSeq=" + nextSeq + " < " + "earliestSeq=" +
earliestSeq + " so may have lost notifs");
break;
}
if (nextSeq < nextSequenceNumber()) {
candidate = notificationAt(nextSeq);
// Skip security check if NotificationBufferFilter is not overloaded
if (!(filter instanceof ServerNotifForwarder.NotifForwarderBufferFilter)) {
try {
ServerNotifForwarder.checkMBeanPermission(this.mBeanServer,
candidate.getObjectName(),"addNotificationListener");
} catch (InstanceNotFoundException | SecurityException e) {
if (logger.debugOn()) {
logger.debug("fetchNotifications", "candidate: " + candidate + " skipped. exception " + e);
}
++nextSeq;
continue;
}
}
if (logger.debugOn()) {
logger.debug("fetchNotifications", "candidate: " +
candidate);
logger.debug("fetchNotifications", "nextSeq now " +
nextSeq);
}
} else {
/* nextSeq is the largest sequence number. If we
already got notifications, return them now.
Otherwise wait for some to arrive, with
timeout. */
if (notifs.size() > 0) {
logger.debug("fetchNotifications",
"no more notifs but have some so don't wait");
break;
}
long toWait = endTime - System.currentTimeMillis();
if (toWait <= 0) {
logger.debug("fetchNotifications", "timeout");
break;
}
/* dispose called */
if (isDisposed()) {
if (logger.debugOn())
logger.debug("fetchNotifications",
"dispose callled, no wait");
return new NotificationResult(earliestSequenceNumber(),
nextSequenceNumber(),
new TargetedNotification[0]);
}
if (logger.debugOn())
logger.debug("fetchNotifications",
"wait(" + toWait + ")");
wait(toWait);
continue;
}
}
/* We have a candidate notification. See if it matches
our filters. We do this outside the synchronized block
so we don't hold up everyone accessing the buffer
(including notification senders) while we evaluate
potentially slow filters. */
ObjectName name = candidate.getObjectName();
Notification notif = candidate.getNotification();
List<TargetedNotification> matchedNotifs =
new ArrayList<TargetedNotification>();
logger.debug("fetchNotifications",
"applying filter to candidate");
filter.apply(matchedNotifs, name, notif);
if (matchedNotifs.size() > 0) {
/* We only check the max size now, so that our
returned nextSeq is as large as possible. This
prevents the caller from thinking it missed
interesting notifications when in fact we knew they
weren't. */
if (maxNotifications <= 0) {
logger.debug("fetchNotifications",
"reached maxNotifications");
break;
}
--maxNotifications;
if (logger.debugOn())
logger.debug("fetchNotifications", "add: " +
matchedNotifs);
notifs.addAll(matchedNotifs);
}
++nextSeq;
} // end while
/* Construct and return the result. */
int nnotifs = notifs.size();
TargetedNotification[] resultNotifs =
new TargetedNotification[nnotifs];
notifs.toArray(resultNotifs);
NotificationResult nr =
new NotificationResult(earliestSeq, nextSeq, resultNotifs);
if (logger.debugOn())
logger.debug("fetchNotifications", nr.toString());
logger.trace("fetchNotifications", "ends");
return nr;
}
synchronized long earliestSequenceNumber() {
return earliestSequenceNumber;
}
synchronized long nextSequenceNumber() {
return nextSequenceNumber;
}
synchronized void addNotification(NamedNotification notif) {
if (logger.traceOn())
logger.trace("addNotification", notif.toString());
while (queue.size() >= queueSize) {
dropNotification();
if (logger.debugOn()) {
logger.debug("addNotification",
"dropped oldest notif, earliestSeq=" +
earliestSequenceNumber);
}
}
queue.add(notif);
nextSequenceNumber++;
if (logger.debugOn())
logger.debug("addNotification", "nextSeq=" + nextSequenceNumber);
notifyAll();
}
private void dropNotification() {
queue.remove(0);
earliestSequenceNumber++;
}
synchronized NamedNotification notificationAt(long seqNo) {
long index = seqNo - earliestSequenceNumber;
if (index < 0 || index > Integer.MAX_VALUE) {
final String msg = "Bad sequence number: " + seqNo + " (earliest "
+ earliestSequenceNumber + ")";
logger.trace("notificationAt", msg);
throw new IllegalArgumentException(msg);
}
return queue.get((int) index);
}
private static class NamedNotification {
NamedNotification(ObjectName sender, Notification notif) {
this.sender = sender;
this.notification = notif;
}
ObjectName getObjectName() {
return sender;
}
Notification getNotification() {
return notification;
}
public String toString() {
return "NamedNotification(" + sender + ", " + notification + ")";
}
private final ObjectName sender;
private final Notification notification;
}
/*
* Add our listener to every NotificationBroadcaster MBean
* currently in the MBean server and to every
* NotificationBroadcaster later created.
*
* It would be really nice if we could just do
* mbs.addNotificationListener(new ObjectName("*:*"), ...);
* Definitely something for the next version of JMX.
*
* There is a nasty race condition that we must handle. We
* first register for MBean-creation notifications so we can add
* listeners to new MBeans, then we query the existing MBeans to
* add listeners to them. The problem is that a new MBean could
* arrive after we register for creations but before the query has
* completed. Then we could see the MBean both in the query and
* in an MBean-creation notification, and we would end up
* registering our listener twice.
*
* To solve this problem, we arrange for new MBeans that arrive
* while the query is being done to be added to the Set createdDuringQuery
* and we do not add a listener immediately. When the query is done,
* we atomically turn off the addition of new names to createdDuringQuery
* and add all the names that were there to the result of the query.
* Since we are dealing with Sets, the result is the same whether or not
* the newly-created MBean was included in the query result.
*
* It is important not to hold any locks during the operation of adding
* listeners to MBeans. An MBean's addNotificationListener can be
* arbitrary user code, and this could deadlock with any locks we hold
* (see bug 6239400). The corollary is that we must not do any operations
* in this method or the methods it calls that require locks.
*/
private void createListeners() {
logger.debug("createListeners", "starts");
synchronized (this) {
createdDuringQuery = new HashSet<ObjectName>();
}
try {
addNotificationListener(MBeanServerDelegate.DELEGATE_NAME,
creationListener, creationFilter, null);
logger.debug("createListeners", "added creationListener");
} catch (Exception e) {
final String msg = "Can't add listener to MBean server delegate: ";
RuntimeException re = new IllegalArgumentException(msg + e);
EnvHelp.initCause(re, e);
logger.fine("createListeners", msg + e);
logger.debug("createListeners", e);
throw re;
}
/* Spec doesn't say whether Set returned by QueryNames can be modified
so we clone it. */
Set<ObjectName> names = queryNames(null, broadcasterQuery);
names = new HashSet<ObjectName>(names);
synchronized (this) {
names.addAll(createdDuringQuery);
createdDuringQuery = null;
}
for (ObjectName name : names)
addBufferListener(name);
logger.debug("createListeners", "ends");
}
private void addBufferListener(ObjectName name) {
checkNoLocks();
if (logger.debugOn())
logger.debug("addBufferListener", name.toString());
try {
addNotificationListener(name, bufferListener, null, name);
} catch (Exception e) {
logger.trace("addBufferListener", e);
/* This can happen if the MBean was unregistered just
after the query. Or user NotificationBroadcaster might
throw unexpected exception. */
}
}
private void removeBufferListener(ObjectName name) {
checkNoLocks();
if (logger.debugOn())
logger.debug("removeBufferListener", name.toString());
try {
removeNotificationListener(name, bufferListener);
} catch (Exception e) {
logger.trace("removeBufferListener", e);
}
}
private void addNotificationListener(final ObjectName name,
final NotificationListener listener,
final NotificationFilter filter,
final Object handback)
throws Exception {
try {
AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {
public Void run() throws InstanceNotFoundException {
mBeanServer.addNotificationListener(name,
listener,
filter,
handback);
return null;
}
});
} catch (Exception e) {
throw extractException(e);
}
}
private void removeNotificationListener(final ObjectName name,
final NotificationListener listener)
throws Exception {
try {
AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {
public Void run() throws Exception {
mBeanServer.removeNotificationListener(name, listener);
return null;
}
});
} catch (Exception e) {
throw extractException(e);
}
}
private Set<ObjectName> queryNames(final ObjectName name,
final QueryExp query) {
PrivilegedAction<Set<ObjectName>> act =
new PrivilegedAction<Set<ObjectName>>() {
public Set<ObjectName> run() {
return mBeanServer.queryNames(name, query);
}
};
try {
return AccessController.doPrivileged(act);
} catch (RuntimeException e) {
logger.fine("queryNames", "Failed to query names: " + e);
logger.debug("queryNames", e);
throw e;
}
}
private static boolean isInstanceOf(final MBeanServer mbs,
final ObjectName name,
final String className) {
PrivilegedExceptionAction<Boolean> act =
new PrivilegedExceptionAction<Boolean>() {
public Boolean run() throws InstanceNotFoundException {
return mbs.isInstanceOf(name, className);
}
};
try {
return AccessController.doPrivileged(act);
} catch (Exception e) {
logger.fine("isInstanceOf", "failed: " + e);
logger.debug("isInstanceOf", e);
return false;
}
}
/* This method must not be synchronized. See the comment on the
* createListeners method.
*
* The notification could arrive after our buffer has been destroyed
* or even during its destruction. So we always add our listener
* (without synchronization), then we check if the buffer has been
* destroyed and if so remove the listener we just added.
*/
private void createdNotification(MBeanServerNotification n) {
final String shouldEqual =
MBeanServerNotification.REGISTRATION_NOTIFICATION;
if (!n.getType().equals(shouldEqual)) {
logger.warning("createNotification", "bad type: " + n.getType());
return;
}
ObjectName name = n.getMBeanName();
if (logger.debugOn())
logger.debug("createdNotification", "for: " + name);
synchronized (this) {
if (createdDuringQuery != null) {
createdDuringQuery.add(name);
return;
}
}
if (isInstanceOf(mBeanServer, name, broadcasterClass)) {
addBufferListener(name);
if (isDisposed())
removeBufferListener(name);
}
}
private class BufferListener implements NotificationListener {
public void handleNotification(Notification notif, Object handback) {
if (logger.debugOn()) {
logger.debug("BufferListener.handleNotification",
"notif=" + notif + "; handback=" + handback);
}
ObjectName name = (ObjectName) handback;
addNotification(new NamedNotification(name, notif));
}
}
private final NotificationListener bufferListener = new BufferListener();
private static class BroadcasterQuery
extends QueryEval implements QueryExp {
private static final long serialVersionUID = 7378487660587592048L;
public boolean apply(final ObjectName name) {
final MBeanServer mbs = QueryEval.getMBeanServer();
return isInstanceOf(mbs, name, broadcasterClass);
}
}
private static final QueryExp broadcasterQuery = new BroadcasterQuery();
private static final NotificationFilter creationFilter;
static {
NotificationFilterSupport nfs = new NotificationFilterSupport();
nfs.enableType(MBeanServerNotification.REGISTRATION_NOTIFICATION);
creationFilter = nfs;
}
private final NotificationListener creationListener =
new NotificationListener() {
public void handleNotification(Notification notif,
Object handback) {
logger.debug("creationListener", "handleNotification called");
createdNotification((MBeanServerNotification) notif);
}
};
private void destroyListeners() {
checkNoLocks();
logger.debug("destroyListeners", "starts");
try {
removeNotificationListener(MBeanServerDelegate.DELEGATE_NAME,
creationListener);
} catch (Exception e) {
logger.warning("remove listener from MBeanServer delegate", e);
}
Set<ObjectName> names = queryNames(null, broadcasterQuery);
for (final ObjectName name : names) {
if (logger.debugOn())
logger.debug("destroyListeners",
"remove listener from " + name);
removeBufferListener(name);
}
logger.debug("destroyListeners", "ends");
}
private void checkNoLocks() {
if (Thread.holdsLock(this) || Thread.holdsLock(globalLock))
logger.warning("checkNoLocks", "lock protocol violation");
}
/**
* Iterate until we extract the real exception
* from a stack of PrivilegedActionExceptions.
*/
private static Exception extractException(Exception e) {
while (e instanceof PrivilegedActionException) {
e = ((PrivilegedActionException)e).getException();
}
return e;
}
private static final ClassLogger logger =
new ClassLogger("javax.management.remote.misc",
"ArrayNotificationBuffer");
private final MBeanServer mBeanServer;
private final ArrayQueue<NamedNotification> queue;
private int queueSize;
private long earliestSequenceNumber;
private long nextSequenceNumber;
private Set<ObjectName> createdDuringQuery;
static final String broadcasterClass =
NotificationBroadcaster.class.getName();
}
⏎ com/sun/jmx/remote/internal/ArrayNotificationBuffer.java
Or download all of them as a single archive file:
File name: jre-rt-com-1.8.0_191-src.zip File size: 8099783 bytes Release date: 2018-10-28 Download
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