Logger.java revision 5720
2362N/A * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 0N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 0N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 0N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 0N/A * or visit www.oracle.com if you need additional information or have any * A Logger object is used to log messages for a specific * system or application component. Loggers are normally named, * using a hierarchical dot-separated namespace. Logger names * can be arbitrary strings, but they should normally be based on * the package name or class name of the logged component, such * as java.net or javax.swing. In addition it is possible to create * "anonymous" Loggers that are not stored in the Logger namespace. * Logger objects may be obtained by calls on one of the getLogger * factory methods. These will either create a new Logger or * return a suitable existing Logger. It is important to note that * the Logger returned by one of the {@code getLogger} factory methods * may be garbage collected at any time if a strong reference to the * Logging messages will be forwarded to registered Handler * objects, which can forward the messages to a variety of * destinations, including consoles, files, OS logs, etc. * Each Logger keeps track of a "parent" Logger, which is its * nearest existing ancestor in the Logger namespace. * Each Logger has a "Level" associated with it. This reflects * a minimum Level that this logger cares about. If a Logger's * level is set to <tt>null</tt>, then its effective level is inherited * from its parent, which may in turn obtain it recursively from its * parent, and so on up the tree. * The log level can be configured based on the properties from the * logging configuration file, as described in the description * of the LogManager class. However it may also be dynamically changed * by calls on the Logger.setLevel method. If a logger's level is * changed the change may also affect child loggers, since any child * logger that has <tt>null</tt> as its level will inherit its * effective level from its parent. * On each logging call the Logger initially performs a cheap * check of the request level (e.g., SEVERE or FINE) against the * effective log level of the logger. If the request level is * lower than the log level, the logging call returns immediately. * After passing this initial (cheap) test, the Logger will allocate * a LogRecord to describe the logging message. It will then call a * Filter (if present) to do a more detailed check on whether the * record should be published. If that passes it will then publish * the LogRecord to its output Handlers. By default, loggers also * publish to their parent's Handlers, recursively up the tree. * Each Logger may have a ResourceBundle name associated with it. * The named bundle will be used for localizing logging messages. * If a Logger does not have its own ResourceBundle name, then * it will inherit the ResourceBundle name from its parent, * recursively up the tree. * Most of the logger output methods take a "msg" argument. This * msg argument may be either a raw value or a localization key. * During formatting, if the logger has (or inherits) a localization * ResourceBundle and if the ResourceBundle has a mapping for the msg * string, then the msg string is replaced by the localized value. * Otherwise the original msg string is used. Typically, formatters use * java.text.MessageFormat style formatting to format parameters, so * for example a format string "{0} {1}" would format two parameters * When mapping ResourceBundle names to ResourceBundles, the Logger * will first try to use the Thread's ContextClassLoader. If that * is null it will try the SystemClassLoader instead. As a temporary * transition feature in the initial implementation, if the Logger is * unable to locate a ResourceBundle from the ContextClassLoader or * SystemClassLoader the Logger will also search up the class stack * and use successive calling ClassLoaders to try to locate a ResourceBundle. * (This call stack search is to allow containers to transition to * using ContextClassLoaders and is likely to be removed in future * Formatting (including localization) is the responsibility of * the output Handler, which will typically call a Formatter. * Note that formatting need not occur synchronously. It may be delayed * until a LogRecord is actually written to an external sink. * The logging methods are grouped in five main categories: * There are a set of "log" methods that take a log level, a message * string, and optionally some parameters to the message string. * There are a set of "logp" methods (for "log precise") that are * like the "log" methods, but also take an explicit source class name * There are a set of "logrb" method (for "log with resource bundle") * that are like the "logp" method, but also take an explicit resource * bundle name for use in localizing the log message. * There are convenience methods for tracing method entries (the * "entering" methods), method returns (the "exiting" methods) and * throwing exceptions (the "throwing" methods). * Finally, there are a set of convenience methods for use in the * very simplest cases, when a developer simply wants to log a * simple string at a given log level. These methods are named * after the standard Level names ("severe", "warning", "info", etc.) * and take a single argument, a message string. * For the methods that do not take an explicit source name and * method name, the Logging framework will make a "best effort" * to determine which class and method called into the logging method. * However, it is important to realize that this automatically inferred * information may only be approximate (or may even be quite wrong!). * Virtual machines are allowed to do extensive optimizations when * JITing and may entirely remove stack frames, making it impossible * to reliably locate the calling class and method. * All methods on Logger are multi-thread safe. * <b>Subclassing Information:</b> Note that a LogManager class may * provide its own implementation of named Loggers for any point in * the namespace. Therefore, any subclasses of Logger (unless they * are implemented in conjunction with a new LogManager class) should * take care to obtain a Logger instance from the LogManager class and * should delegate operations such as "isLoggable" and "log(LogRecord)" * to that instance. Note that in order to intercept all logging * output, subclasses need only override the log(LogRecord) method. * All the other logging methods are implemented as calls on this // The fields relating to parent-child relationships and levels // are managed under a separate lock, the treeLock. // We keep weak references from parents to children, but strong // references from children to parents. private volatile int levelValue;
// current effective level value * GLOBAL_LOGGER_NAME is a name for the global logger. * Return global logger object with the name Logger.GLOBAL_LOGGER_NAME. * @return global logger object * The "global" Logger object is provided as a convenience to developers * who are making casual use of the Logging package. Developers * who are making serious use of the logging package (for example * in products) should create and use their own Logger objects, * with appropriate names, so that logging can be controlled on a * suitable per-Logger granularity. Developers also need to keep a * strong reference to their Logger objects to prevent them from * being garbage collected. * @deprecated Initialization of this field is prone to deadlocks. * The field must be initialized by the Logger class initialization * which may cause deadlocks with the LogManager class initialization. * In such cases two class initialization wait for each other to complete. * The preferred way to get the global logger object is via the call * <code>Logger.getGlobal()</code>. * For compatibility with old JDK versions where the * <code>Logger.getGlobal()</code> is not available use the call * <code>Logger.getLogger(Logger.GLOBAL_LOGGER_NAME)</code> * or <code>Logger.getLogger("global")</code>. * Protected method to construct a logger for a named subsystem. * The logger will be initially configured with a null Level * and with useParentHandlers set to true. * @param name A name for the logger. This should * be a dot-separated name and should normally * be based on the package name or class name * of the subsystem, such as java.net * or javax.swing. It may be null for anonymous Loggers. * @param resourceBundleName name of ResourceBundle to be used for localizing * messages for this logger. May be null if none * of the messages require localization. * @throws MissingResourceException if the resourceBundleName is non-null and * no corresponding resource can be found. // Note: we may get a MissingResourceException here. // This constructor is used only to create the global Logger. // It is needed to break a cyclic dependence between the LogManager // and Logger static initializers causing deadlocks. // The manager field is not initialized here. // It is called from the LogManager.<clinit> to complete // initialization of the global Logger. // Complete initialization of the global Logger. // Until all JDK code converted to call sun.util.logging.PlatformLogger // (see 7054233), we need to determine if Logger.getLogger is to add // a system logger or user logger. // As an interim solution, if the immediate caller whose caller loader is // null, we assume it's a system logger and add it to the system context. // 0: Reflection 1: Logger.getLoggerContext 2: Logger.getLogger 3: caller * Find or create a logger for a named subsystem. If a logger has * already been created with the given name it is returned. Otherwise * a new logger is created. * If a new logger is created its log level will be configured * based on the LogManager configuration and it will configured * to also send logging output to its parent's Handlers. It will * be registered in the LogManager global namespace. * Note: The LogManager may only retain a weak reference to the newly * created Logger. It is important to understand that a previously * created Logger with the given name may be garbage collected at any * time if there is no strong reference to the Logger. In particular, * this means that two back-to-back calls like * {@code getLogger("MyLogger").log(...)} may use different Logger * objects named "MyLogger" if there is no strong reference to the * Logger named "MyLogger" elsewhere in the program. * @param name A name for the logger. This should * be a dot-separated name and should normally * be based on the package name or class name * of the subsystem, such as java.net * @return a suitable Logger * @throws NullPointerException if the name is null. // Synchronization is not required here. All synchronization for // adding a new Logger object is handled by LogManager.addLogger(). // This method is intentionally not a wrapper around a call // to getLogger(name, resourceBundleName). If it were then // getLogger("Foo", "resourceBundleForFoo"); // would throw an IllegalArgumentException in the second call // because the wrapper would result in an attempt to replace // the existing "resourceBundleForFoo" with null. * Find or create a logger for a named subsystem. If a logger has * already been created with the given name it is returned. Otherwise * a new logger is created. * If a new logger is created its log level will be configured * based on the LogManager and it will configured to also send logging * output to its parent's Handlers. It will be registered in * the LogManager global namespace. * Note: The LogManager may only retain a weak reference to the newly * created Logger. It is important to understand that a previously * created Logger with the given name may be garbage collected at any * time if there is no strong reference to the Logger. In particular, * this means that two back-to-back calls like * {@code getLogger("MyLogger", ...).log(...)} may use different Logger * objects named "MyLogger" if there is no strong reference to the * Logger named "MyLogger" elsewhere in the program. * If the named Logger already exists and does not yet have a * localization resource bundle then the given resource bundle * name is used. If the named Logger already exists and has * a different resource bundle name then an IllegalArgumentException * @param name A name for the logger. This should * be a dot-separated name and should normally * be based on the package name or class name * of the subsystem, such as java.net * @param resourceBundleName name of ResourceBundle to be used for localizing * messages for this logger. May be <CODE>null</CODE> if none of * the messages require localization. * @return a suitable Logger * @throws MissingResourceException if the resourceBundleName is non-null and * no corresponding resource can be found. * @throws IllegalArgumentException if the Logger already exists and uses * a different resource bundle name. * @throws NullPointerException if the name is null. // Synchronization is not required here. All synchronization for // adding a new Logger object is handled by LogManager.addLogger(). // Note: we may get a MissingResourceException here. // Add a platform logger to the system context. // i.e. caller of sun.util.logging.PlatformLogger.getLogger // all loggers in the system context will default to // the system logger's resource bundle * Create an anonymous Logger. The newly created Logger is not * registered in the LogManager namespace. There will be no * access checks on updates to the logger. * This factory method is primarily intended for use from applets. * Because the resulting Logger is anonymous it can be kept private * by the creating class. This removes the need for normal security * checks, which in turn allows untrusted applet code to update * the control state of the Logger. For example an applet can do * a setLevel or an addHandler on an anonymous Logger. * Even although the new logger is anonymous, it is configured * to have the root logger ("") as its parent. This means that * by default it inherits its effective level and handlers * @return a newly created private Logger * Create an anonymous Logger. The newly created Logger is not * registered in the LogManager namespace. There will be no * access checks on updates to the logger. * This factory method is primarily intended for use from applets. * Because the resulting Logger is anonymous it can be kept private * by the creating class. This removes the need for normal security * checks, which in turn allows untrusted applet code to update * the control state of the Logger. For example an applet can do * a setLevel or an addHandler on an anonymous Logger. * Even although the new logger is anonymous, it is configured * to have the root logger ("") as its parent. This means that * by default it inherits its effective level and handlers * @param resourceBundleName name of ResourceBundle to be used for localizing * messages for this logger. * May be null if none of the messages require localization. * @return a newly created private Logger * @throws MissingResourceException if the resourceBundleName is non-null and * no corresponding resource can be found. // Synchronization is not required here. All synchronization for // adding a new anonymous Logger object is handled by doSetParent(). // cleanup some Loggers that have been GC'ed * Retrieve the localization resource bundle for this * logger for the current default locale. Note that if * the result is null, then the Logger will use a resource * bundle inherited from its parent. * @return localization bundle (may be null) * Retrieve the localization resource bundle name for this * logger. Note that if the result is null, then the Logger * will use a resource bundle name inherited from its parent. * @return localization bundle name (may be null) * Set a filter to control output on this Logger. * After passing the initial "level" check, the Logger will * call this Filter to check if a log record should really * @param newFilter a filter object (may be null) * @exception SecurityException if a security manager exists and if * the caller does not have LoggingPermission("control"). * Get the current filter for this Logger. * @return a filter object (may be null) * All the other logging methods in this class call through * this method to actually perform any logging. Subclasses can * override this single method to capture all log activity. * @param record the LogRecord to be published // Post the LogRecord to all our Handlers, and then to // our parents' handlers, all the way up the tree. // private support method for logging. // We fill in the logger name, resource bundle name, and // resource bundle and then call "void log(LogRecord)". //================================================================ // Start of convenience methods WITHOUT className and methodName //================================================================ * Log a message, with no arguments. * If the logger is currently enabled for the given message * level then the given message is forwarded to all the * registered output Handler objects. * @param level One of the message level identifiers, e.g., SEVERE * @param msg The string message (or a key in the message catalog) * Log a message, with one object parameter. * If the logger is currently enabled for the given message * level then a corresponding LogRecord is created and forwarded * to all the registered output Handler objects. * @param level One of the message level identifiers, e.g., SEVERE * @param msg The string message (or a key in the message catalog) * @param param1 parameter to the message * Log a message, with an array of object arguments. * If the logger is currently enabled for the given message * level then a corresponding LogRecord is created and forwarded * to all the registered output Handler objects. * @param level One of the message level identifiers, e.g., SEVERE * @param msg The string message (or a key in the message catalog) * @param params array of parameters to the message * Log a message, with associated Throwable information. * If the logger is currently enabled for the given message * level then the given arguments are stored in a LogRecord * which is forwarded to all registered output handlers. * Note that the thrown argument is stored in the LogRecord thrown * property, rather than the LogRecord parameters property. Thus is it * processed specially by output Formatters and is not treated * as a formatting parameter to the LogRecord message property. * @param level One of the message level identifiers, e.g., SEVERE * @param msg The string message (or a key in the message catalog) * @param thrown Throwable associated with log message. //================================================================ // Start of convenience methods WITH className and methodName //================================================================ * Log a message, specifying source class and method, * If the logger is currently enabled for the given message * level then the given message is forwarded to all the * registered output Handler objects. * @param level One of the message level identifiers, e.g., SEVERE * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that issued the logging request * @param msg The string message (or a key in the message catalog) * Log a message, specifying source class and method, * with a single object parameter to the log message. * If the logger is currently enabled for the given message * level then a corresponding LogRecord is created and forwarded * to all the registered output Handler objects. * @param level One of the message level identifiers, e.g., SEVERE * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that issued the logging request * @param msg The string message (or a key in the message catalog) * @param param1 Parameter to the log message. * Log a message, specifying source class and method, * with an array of object arguments. * If the logger is currently enabled for the given message * level then a corresponding LogRecord is created and forwarded * to all the registered output Handler objects. * @param level One of the message level identifiers, e.g., SEVERE * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that issued the logging request * @param msg The string message (or a key in the message catalog) * @param params Array of parameters to the message * Log a message, specifying source class and method, * with associated Throwable information. * If the logger is currently enabled for the given message * level then the given arguments are stored in a LogRecord * which is forwarded to all registered output handlers. * Note that the thrown argument is stored in the LogRecord thrown * property, rather than the LogRecord parameters property. Thus is it * processed specially by output Formatters and is not treated * as a formatting parameter to the LogRecord message property. * @param level One of the message level identifiers, e.g., SEVERE * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that issued the logging request * @param msg The string message (or a key in the message catalog) * @param thrown Throwable associated with log message. //========================================================================= // Start of convenience methods WITH className, methodName and bundle name. //========================================================================= // Private support method for logging for "logrb" methods. // We fill in the logger name, resource bundle name, and // resource bundle and then call "void log(LogRecord)". * Log a message, specifying source class, method, and resource bundle name * If the logger is currently enabled for the given message * level then the given message is forwarded to all the * registered output Handler objects. * The msg string is localized using the named resource bundle. If the * resource bundle name is null, or an empty String or invalid * then the msg string is not localized. * @param level One of the message level identifiers, e.g., SEVERE * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that issued the logging request * @param bundleName name of resource bundle to localize msg, * @param msg The string message (or a key in the message catalog) * Log a message, specifying source class, method, and resource bundle name, * with a single object parameter to the log message. * If the logger is currently enabled for the given message * level then a corresponding LogRecord is created and forwarded * to all the registered output Handler objects. * The msg string is localized using the named resource bundle. If the * resource bundle name is null, or an empty String or invalid * then the msg string is not localized. * @param level One of the message level identifiers, e.g., SEVERE * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that issued the logging request * @param bundleName name of resource bundle to localize msg, * @param msg The string message (or a key in the message catalog) * @param param1 Parameter to the log message. * Log a message, specifying source class, method, and resource bundle name, * with an array of object arguments. * If the logger is currently enabled for the given message * level then a corresponding LogRecord is created and forwarded * to all the registered output Handler objects. * The msg string is localized using the named resource bundle. If the * resource bundle name is null, or an empty String or invalid * then the msg string is not localized. * @param level One of the message level identifiers, e.g., SEVERE * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that issued the logging request * @param bundleName name of resource bundle to localize msg, * @param msg The string message (or a key in the message catalog) * @param params Array of parameters to the message * Log a message, specifying source class, method, and resource bundle name, * with associated Throwable information. * If the logger is currently enabled for the given message * level then the given arguments are stored in a LogRecord * which is forwarded to all registered output handlers. * The msg string is localized using the named resource bundle. If the * resource bundle name is null, or an empty String or invalid * then the msg string is not localized. * Note that the thrown argument is stored in the LogRecord thrown * property, rather than the LogRecord parameters property. Thus is it * processed specially by output Formatters and is not treated * as a formatting parameter to the LogRecord message property. * @param level One of the message level identifiers, e.g., SEVERE * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that issued the logging request * @param bundleName name of resource bundle to localize msg, * @param msg The string message (or a key in the message catalog) * @param thrown Throwable associated with log message. //====================================================================== // Start of convenience methods for logging method entries and returns. //====================================================================== * This is a convenience method that can be used to log entry * to a method. A LogRecord with message "ENTRY", log level * FINER, and the given sourceMethod and sourceClass is logged. * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that is being entered * Log a method entry, with one parameter. * This is a convenience method that can be used to log entry * to a method. A LogRecord with message "ENTRY {0}", log level * FINER, and the given sourceMethod, sourceClass, and parameter * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that is being entered * @param param1 parameter to the method being entered * Log a method entry, with an array of parameters. * This is a convenience method that can be used to log entry * to a method. A LogRecord with message "ENTRY" (followed by a * format {N} indicator for each entry in the parameter array), * log level FINER, and the given sourceMethod, sourceClass, and * @param sourceClass name of class that issued the logging request * @param sourceMethod name of method that is being entered * @param params array of parameters to the method being entered * This is a convenience method that can be used to log returning * from a method. A LogRecord with message "RETURN", log level * FINER, and the given sourceMethod and sourceClass is logged. * @param sourceClass name of class that issued the logging request * @param sourceMethod name of the method * Log a method return, with result object. * This is a convenience method that can be used to log returning * from a method. A LogRecord with message "RETURN {0}", log level * FINER, and the gives sourceMethod, sourceClass, and result * @param sourceClass name of class that issued the logging request * @param sourceMethod name of the method * @param result Object that is being returned * Log throwing an exception. * This is a convenience method to log that a method is * terminating by throwing an exception. The logging is done * If the logger is currently enabled for the given message * level then the given arguments are stored in a LogRecord * which is forwarded to all registered output handlers. The * LogRecord's message is set to "THROW". * Note that the thrown argument is stored in the LogRecord thrown * property, rather than the LogRecord parameters property. Thus is it * processed specially by output Formatters and is not treated * as a formatting parameter to the LogRecord message property. * @param sourceClass name of class that issued the logging request * @param sourceMethod name of the method. * @param thrown The Throwable that is being thrown. //======================================================================= // Start of simple convenience methods using level names as method names //======================================================================= * If the logger is currently enabled for the SEVERE message * level then the given message is forwarded to all the * registered output Handler objects. * @param msg The string message (or a key in the message catalog) * If the logger is currently enabled for the WARNING message * level then the given message is forwarded to all the * registered output Handler objects. * @param msg The string message (or a key in the message catalog) * If the logger is currently enabled for the INFO message * level then the given message is forwarded to all the * registered output Handler objects. * @param msg The string message (or a key in the message catalog) * If the logger is currently enabled for the CONFIG message * level then the given message is forwarded to all the * registered output Handler objects. * @param msg The string message (or a key in the message catalog) * If the logger is currently enabled for the FINE message * level then the given message is forwarded to all the * registered output Handler objects. * @param msg The string message (or a key in the message catalog) * If the logger is currently enabled for the FINER message * level then the given message is forwarded to all the * registered output Handler objects. * @param msg The string message (or a key in the message catalog) * If the logger is currently enabled for the FINEST message * level then the given message is forwarded to all the * registered output Handler objects. * @param msg The string message (or a key in the message catalog) //================================================================ // End of convenience methods //================================================================ * Set the log level specifying which message levels will be * logged by this logger. Message levels lower than this * value will be discarded. The level value Level.OFF * can be used to turn off logging. * If the new level is null, it means that this node should * inherit its level from its nearest ancestor with a specific * (non-null) level value. * @param newLevel the new value for the log level (may be null) * @exception SecurityException if a security manager exists and if * the caller does not have LoggingPermission("control"). * Get the log Level that has been specified for this Logger. * The result may be null, which means that this logger's * effective level will be inherited from its parent. * @return this Logger's level * Check if a message of the given level would actually be logged * by this logger. This check is based on the Loggers effective level, * which may be inherited from its parent. * @param level a message logging level * @return true if the given message level is currently being logged. * Get the name for this logger. * @return logger name. Will be null for anonymous Loggers. * Add a log Handler to receive logging messages. * By default, Loggers also send their output to their parent logger. * Typically the root Logger is configured with a set of Handlers * that essentially act as default handlers for all loggers. * @param handler a logging Handler * @exception SecurityException if a security manager exists and if * the caller does not have LoggingPermission("control"). // Check for null handler * Returns silently if the given Handler is not found or is null * @param handler a logging Handler * @exception SecurityException if a security manager exists and if * the caller does not have LoggingPermission("control"). * Get the Handlers associated with this logger. * @return an array of all registered Handlers * Specify whether or not this logger should send its output * to its parent Logger. This means that any LogRecords will * also be written to the parent's Handlers, and potentially * to its parent, recursively up the namespace. * @param useParentHandlers true if output is to be sent to the * @exception SecurityException if a security manager exists and if * the caller does not have LoggingPermission("control"). * Discover whether or not this logger is sending its output * @return true if output is to be sent to the logger's parent // Private utility method to map a resource bundle name to an // actual resource bundle, using a simple one-entry cache. // Returns null for a null name. // May also return null if we can't find the resource bundle and // there is no suitable previous cached value. // the resource bundle is in a restricted package // Return a null bundle for a null name. // Normally we should hit on our simple one entry cache. // Use the thread's context ClassLoader. If there isn't one, // use the SystemClassloader. // Woops. We can't find the ResourceBundle in the default // ClassLoader. Drop through. // Fall back to searching up the call stack and trying each for (
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// We've already checked this classloader. // Ok, this one didn't work either. // Drop through, and try the next one. // Return the previous cached value for that name. // Sorry, we're out of luck. // Private utility method to initialize our one entry // resource bundle cache. // Note: for consistency reasons, we are careful to check // that a suitable ResourceBundle exists before setting the // We've failed to find an expected ResourceBundle. * Return the parent for this Logger. * This method returns the nearest extant parent in the namespace. * Thus if a Logger is called "a.b.c.d", and a Logger called "a.b" * has been created but no logger "a.b.c" exists, then a call of * getParent on the Logger "a.b.c.d" will return the Logger "a.b". * The result will be null if it is called on the root Logger * @return nearest existing parent Logger // Note: this used to be synchronized on treeLock. However, this only // provided memory semantics, as there was no guarantee that the caller // would synchronize on treeLock (in fact, there is no way for external // callers to so synchronize). Therefore, we have made parent volatile * Set the parent for this Logger. This method is used by * the LogManager to update a Logger when the namespace changes. * It should not be called from application code. * @param parent the new parent logger * @exception SecurityException if a security manager exists and if * the caller does not have LoggingPermission("control"). // Private method to do the work for parenting a child // Logger onto a parent logger. // System.err.println("doSetParent \"" + getName() + "\" \"" // + newParent.getName() + "\""); // Remove ourself from any previous parent. // assert parent.kids != null; // ref is used down below to complete the reparenting // We have now removed ourself from our parents' kids. // we didn't have a previous parent // As a result of the reparenting, the effective level // may have changed for us and our children. // Remove the weak reference for the specified child Logger from the // kid list. We should only be called from LoggerWeakRef.dispose(). // Recalculate the effective level for this node and // recursively for our children. // assert Thread.holdsLock(treeLock); // Figure out our current effective level. // This may happen during initialization. // If our effective value hasn't changed, we're done. // System.err.println("effective level: \"" + getName() + "\" := " + level); // Recursively update the level on each of our kids. // Private method to get the potentially inherited // resource bundle name for this Logger.