It can also display messages as they are logged or search for past log messages. For information about viewing, configuring, and searching message logs, see the following topics in the Oracle WebLogic Server Administration Console Help :. This index of messages describes all of the messages emitted by WebLogic subsystems and provides a detailed description of the error, a possible cause, and a recommended action to avoid or fix the error.
To view available details, click on the appropriate entry in the Range column if viewing by range or the Subsystem column if viewing by subsystem. The Server Logging Bridge provides a lightweight mechanism for applications that currently use Java Logging or Log4J Logging to have their log messages redirected to WebLogic logging services. To use the Server Logging Bridge, you only need to create a logging properties file as described in the following sections.
When the handler receives an application log message, in the form of a java. LogRecord object, the handler redirects the message to the WebLogic logging service destinations, such as stdout, server log, domain log, and so on, as appropriate.
The following information contained in the LogRecord determines how the log message is redirected:. The severity level is automatically converted to one of the standard WebLogic logging service severity levels when the log message redirected. The Server Logging Bridge handler publishes the application message to a logger in the WebLogic Logger tree matching the logger name contained in the LogRecord. If no logger name exists in the LogRecord , the message is published to the root logger.
The Level of the LogRecord is automatically converted to one of the standard WebLogic logging service severity levels when the log message redirected. To use the Server Logging Bridge handler, create a logging. Server startup command. This properties file, which can be placed in any directory, registers the Server Logging Bridge handler in the application's logger tree. Example shows an example logging. Example Example logging. The following example shows passing the logging.
Server startup command:. When the appender receives an application log message, in the form of a org. LoggingEvent object, the appender redirects the message to the WebLogic logging service destinations such as stdout, server log, domain log, and so on, as appropriate.
The following information contained in the LoggingEvent determines how the log message is redirected:. If no logger name exists in the LoggingEvent , the message is published to the root logger. To use the Server Logging Bridge appender, create a log4j. The log4j. For detailed information about configuring Log4j logging, see the following Logging Services documentation published by logging.
Example shows an example log4j. Example Example log4j. By default, log messages originating from loggers with the com. However, you can propagate messages to the application's root logger by enabling the LogMBean. If you are using Log4j for application logging, the log4j. The generic overrides feature provides a convenient means to insert, or make changes to, specific resources types used by an application and to continue using the existing ClassLoader and resource loading rules and behaviors for the application, without having to revise the application JAR files.
How WebLogic Logging Services Work The following sections describe the logging environment and provide an overview of the logging process.
Components and Environment There are two basic components in any logging system: a component that produces log messages and another component to distribute publish messages. In addition to using the message catalog framework, your application can use the following mechanisms to send messages to the WebLogic server log: weblogic.
Server Logging Bridge WebLogic Server provides a mechanism by which your logging application can have its messages redirected to WebLogic logging services without the need to make code changes or implement any of the propriety WebLogic Logging APIs.
Terminology Logger - A Logger object logs messages for a specific subsystem or application component. If your application is configured for Java Logging or Log4j, in order to publish application events using WebLogic logging services, you can do either of the following: Recommended Configure your application's logger to use the Server Logging Bridge, which provides a lightweight means for your application's log messages to be redirected to WebLogic logging services without requiring any code changes.
Server Log Files and Domain Log Files Each WebLogic Server instance writes all messages from its subsystems and applications to a server log file that is located on the local host computer. How a Server Instance Forwards Messages to the Domain Log To forward messages to the domain log, each server instance broadcasts its log messages. Note: This can result in a domain log file that lists messages with earlier timestamps after messages with later timestamps.
When messages from the buffer of a previously disconnected Managed Server are flushed to the Administration Server, those messages are simply appended to the domain log, even though they were generated before the previous messages in the domain log. Server Log The server log records information about events such as the startup and shutdown of servers, the deployment of new applications, or the failure of one or more subsystems. Note: Oracle recommends that you do not modify log files by editing them manually.
Modifying a file changes the timestamp and can confuse log file rotation. In addition, editing a file might lock it and prevent updates from WebLogic Server, as well as interfere with the Accessor. Subsystem Logs The server log messages and log file communicate events and conditions that affect the operation of the server or the application. Log Message Format When a WebLogic Server instance writes a message to the server log file, the first line of each message begins with followed by the message attributes.
If the message includes a stack trace, the stack trace is included in the message text. WebLogic Server uses the host computer's default character encoding for the messages it writes. Message Attributes The messages for all WebLogic Server instances contain a consistent set of attributes as described in Table Table Server Log Message Attributes Attribute Description Locale-formatted Timestamp Time and date when the message originated, in a format that is specific to the locale.
Severity Indicates the degree of impact or seriousness of the event reported by the message. Machine Name is the DNS name of the computer that hosts the server instance. Log messages that are generated within a client JVM do not include this field. Transaction ID Present only for messages logged within the context of a transaction. Diagnostic Context ID Context information to correlate messages coming from a specific request or application. Raw Time Value The timestamp in milliseconds.
Message ID A unique six-digit identifier. Message Text A description of the event or condition. Message Severity The severity attribute of a WebLogic Server log message indicates the potential impact of the event or condition that the message reports.
INFO Used for reporting normal operations; a low-level informational message. ALERT A particular service is in an unusable state while other parts of the system continue to function. This severity indicates a severe system failure or panic. Note: Applications that use the com.
The following information contained in the LogRecord determines how the log message is redirected: Message severity level The severity level is automatically converted to one of the standard WebLogic logging service severity levels when the log message redirected. Logger name The Server Logging Bridge handler publishes the application message to a logger in the WebLogic Logger tree matching the logger name contained in the LogRecord. Log Level The Level of the LogRecord is automatically converted to one of the standard WebLogic logging service severity levels when the log message redirected.
LoggerSeverityProperties attribute is recommended because it is dynamic and can be persisted in the domain's config. ServerLoggingHandler Register handlers for the com. ConsoleHandler, weblogic. ServerLoggingHandler Do not send the toyshop log messages to the root handler com.
Note: When you start WebLogic Server by passing a logging. Some subsystems maintain additional log files to provide an audit of the subsystem's interactions under normal operating conditions.
The default location and rotation policy for HTTP access logs is the same as the server log. You can set the attributes that define the behavior of HTTP access logs for each server or for each virtual host that you define. Many administration operations lead to log messages being generated. Deploying an application, as well as the application itself, can result in new log messages being generated.
The WebLogic Server 12c collection contains a number of additional tutorials, covering a variety of topics. See the WebLogic Server 12c collection here for additional topics and content.
Configure and Use Log Files. Before You Begin This minute tutorial shows how to examine log files. What Do You Need? An installation of Oracle WebLogic Server 12c. An example application called benefitslog which you can download from here.
To view log messages from the Administration Console: Ensure that the Administration Server is up and running. In the left pane of the Console, expand Diagnostics and select Log Files.
The log files table lists all of the logs for the domain, including the domain log, server logs, HTTP Access logs and others. The domain log page displays up to messages from most recent to least recent. The messages at the top of the window are the most recent messages that the server has generated. The log entry details for the selected entry are displayed. To view domain log files: Note : This tutorial uses typical Linux commands to view, search, and otherwise examine WebLogic Server log files.
Note : In this tutorial, use the word listening as an example to search the AdminServer. Note : less is a linux utilty for listing files. Additionally, you can use the Logger reference to issue log requests to WebLogic logging services; this requires that the Log4j libraries be available to your deployed application. If your application has no requirement to interact with WebLogic logging services, package the Log4j libraries in the application's LIB directory. The server logging will continue to use the default Java Logging implementation.
Java Logging is the default for client and server-side logging; Log4j is available only for server-side and not client-side logging.
The following example shows setting the value of the Log4jLoggingEnabled property to enable logging to a Log4j Logger in the Administration Server.
Note that after you run such a script, restart the server for the settings to take effect. You can enable Log4j for the server Logger as well as the domain Logger , which resides only on the Administration Server.
The domain Log4j Logger reference is provided by invoking the weblogic. The following example shows configuring the server Logger to use Log4j and the domain Logger to use the default Java Logger. The following is a Log4j logging configuration example that shows how to specify a severity level for Stdout and a filter for messages going to the server log file in the config.
You have programmatic access to the Log4j Logger and its appenders handlers and layouts formatters for configuration purposes. WebLogic logging services provide the Commons LogFactory and Log interface implementations that direct requests to the underlying logging implementation being used by WebLogic logging services.
Example illustrates how to use the Commons interface by setting the appropriate system property. When you use the org. LogFactory system property to implement the Commons interface as described here, you are implementing it for all application instances running on the server. For information on how to implement Commons logging for specific application instances, without affecting other applications, use the JDK service discovery mechanism or commons-logging.
This LogFactory creates instances of weblogic. LogFactoryImpl that implement the org. Log interface. The Commons Log interface methods accept an object. In most cases, this will be a string containing the message text. The Commons LogObject takes a message ID, subsystem name, and a string message argument in its constructor. See org. WebLogic Server provides a hierarchical Logger tree that lets you specify the Severity level for:. LogFactory interface is enabled. All Loggers inherit their Severity level from the nearest parent in the tree.
You can, however, explicitly set the Severity level of a Logger, thereby overriding the level that is set for the nearest parent. If you are using the Message Catalog Loggers, the Severity level for messages coming from a specific subsystem are determined by the Severity level of the root Logger.
For example, suppose the root Logger severity level is Critical , and you want to set the Severity Level to Notice for the Security subsystem logger and to Warning for the EJB subsystem logger. Note that each string is entered on an individual line in this properties box; that is, press the Enter key after each string, then click Save. For a complete index of all subsystem names, see Error Messages. The subsystem name is case-sensitive and must be entered exactly as shown in the Subsystem column of the index.
For example, logger names could be a. FooLogger or a. Barlogger , corresponding to the name of the classes in which they are used. In this case, each dot-separated identifier appears as a node in the Logger tree. For example, there will be a child node named " a " under the root Logger, a child node named " b " whose parent is " a ", and so on. You can configure the Severity for a package or for any Logger at any level in the tree.
For example, if you specify the Severity level for package a. You can, however, override the Severity level of a parent node by explicitly setting a value for a child node. For example, if you specify the Severity level for logger a. The log messages are accumulated in predefined numbered log files. Whenever the file grows in size from the set size, depending on whether it is in development or production mode, the server rotates its server log file.
By default, the rotated log files are numbered in order of creation filenamennnnn , where filename is the name configured for the log file. By default, when you start a server instance in production mode , the server rotates its server log file whenever the file grows to kilobytes in size. It does not rotate the local server log file when you start the server.
You can change these default settings for log file rotation. For example, you can change the file size at which the server rotates the log file or you can configure a server to rotate log files based on a time interval. You can also specify the maximum number of rotated files that can accumulate. After the number of log files reaches this number, subsequent file rotations delete the oldest log file and create a new log file with the latest suffix.
WebLogic Server sets a threshold size limit of 2,, kilobytes before it forces a hard rotation to prevent excessive log file growth. By default, the rotated files are stored in the same directory where the log file is stored. The following command specifies the directory location for the archived log files using the -Dweblogic.
LogFileRotationDir Java startup option:. When the log file exceeds the rotation threshold that you specify, the server instance prints a log message that states that the log file will be rotated.
Then it rotates the log file and prints an additional message that indicates the name of the file that contains the old messages.
For example, if you set up log files to rotate by size and you specify K as the minimum rotation size, when the server determines that the file is greater than K in size, the server prints the following message:. Note that the severity level for both messages is Info. File systems such as the standard Windows file system place a lock on files that are open for reading. On such file systems, if your application is tailing the log file, or if you are using a command such as the DOS tail -f command in a command prompt, the tail operation stops after the server has rotated the log file.
The tail -f command prints messages to standard out as lines are added to a file. For more information, enter help tail in a DOS prompt. To remedy this situation for an application that tails the log file, you can create a JMX listener that notifies your application when the server emits the log rotation message.
When your application receives the message, it can restart its tailing operation. Server as well as application code write directly to these streams instead of using the logging mechanism. However, you can use a configuration option to redirect the JVM output to all registered log destinations, such as the server terminal console and the server log file.
When this redirect is enabled, a log entry appears as a message of Notice severity. Note that redirecting the JVM output does not capture output from native code; for example, thread dumps from the JVM are not captured. Redirecting JVM standard out and standard error messages to the WebLogic logging service by enabling the LogMBean attributes, as described in this section, has two key disadvantages you should be aware of:.
JVM messages are redirected asynchronously. In the event of an overload situation, these messages may be dropped. Redirecting JVM messages to the WebLogic logging service in high volume can have a significantly negative impact on system performance and is therefore not recommended. As a best practice for storing JVM standard out and standard error messages in a log file, Oracle recommends using one of the supported logging APIs instead.
Using a logging API ensures that even during times of peak system load, messages are not lost, including the times when those messages are generated in high volume. To configure WebLogic Server to redirect JVM standard out or standard error messages to the WebLogic logging service, you can do one of the following:.
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