For example, if the Administration Server is unavailable for two hours and then is restored, the domain log will not contain any messages that were generated during the two hours. In production mode, the default buffer size on the managed server is When the buffer reaches its capacity, the messages in the buffer are flushed by sending them to the domain log on the administration server.
For performance reasons, it is recommended that you set this value to 10 or higher in production. A higher value will cause the buffer to be broadcast to the domain log less frequently. If you have configured a value greater than 1 , that number of messages will be forwarded to the domain log when the Managed Server is reconnected to the Administration Server.
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.
Each subsystem within WebLogic Server generates log messages to communicate its status. For example, when you start a WebLogic Server instance, the Security subsystem writes a message to report its initialization status. To keep a record of the messages that its subsystems generate, WebLogic Server writes the messages to log files.
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. The messages include information about the time and date of the event as well as the ID of the user who initiated the event. You can view and sort these server log messages to detect problems, track down the source of a fault, and track system performance. You can also create client applications that listen for these messages and respond automatically.
For example, you can create an application that listens for messages indicating a failed subsystem and sends E-mail to a system administrator. The server log file is located on the computer that hosts the server instance. Each server instance has its own server log file. To view messages in the server log file, you can log on to the WebLogic Server host computer and use a standard text editor, or you can log on to any computer and use the log file viewer in the Administration Console. 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. In addition to writing messages to a log file, each server instance prints a subset of its messages to standard out. Usually, standard out is the shell command prompt in which you are running the server instance. However, some operating systems enable you to redirect standard out to some other location.
A subsequent section, Message Severity, describes severity levels. You can modify the severity threshold so that the server prints more or fewer messages to standard out. The server log messages and log file communicate events and conditions that affect the operation of the server or the application. Some subsystems maintain additional log files to provide an audit of the subsystem's interactions under normal operating conditions. The following list describes each of the additional log files:.
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. Each server has a transaction log which stores information about committed transactions coordinated by the server that may not have been completed. WebLogic Server uses the transaction log when recovering from system crashes or network failures.
You cannot directly view the transaction log - the file is in a binary format. The Transaction Manager uses the default persistent store to store transaction log files.
Using the Administration Console, you can change where the default store is located. The WebLogic Auditing provider records information from a number of security requests, which are determined internally by the WebLogic Security Framework.
The WebLogic Auditing provider also records the event data associated with these security requests, and the outcome of the requests. Configuring an Auditing provider is optional. The default security realm myrealm does not have an Auditing provider configured. Although an Auditing provider is configured per security realm, each server writes auditing data to its own log file in the server directory.
The events related to JDBC are now written to the server log, such as when connections are created or refreshed or when configuration changes are made to JDBC objects. JMS server log files contain information on basic message life cycle events, such as message production, consumption, and removal. When a JMS destination hosting the subject message is configured with message logging enabled, then each of the basic message life cycle events will generate a message log event in the JMS message log file.
After you create a JMS server, you can change the default name of its log file, as well as configure criteria for moving rotating old log messages to a separate file. 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.
Each attribute is contained between angle brackets. A subsequent section, Message Attributes, describes each attribute. If a message is not logged within the context of a transaction, the angle brackets for Transaction ID are present even though no Transaction ID is present.
Here is an example of how the message from the previous section would be printed to standard out:. The messages for all WebLogic Server instances contain a consistent set of attributes as described in Table In addition, if your application uses WebLogic logging services to generate messages, its messages will contain these attributes. Table Server Log Message Attributes.
Time and date when the message originated, in a format that is specific to the locale. Indicates the degree of impact or seriousness of the event reported by the message. See Message Severity. Server Name is the name of the WebLogic Server instance on which the message was generated. Log messages that are generated within a client JVM do not include these attributes. For example, if your application runs in a client JVM and it uses the WebLogic logging services, the messages that it generates and sends to the WebLogic client log files will not include these attributes.
To execute some pieces of internal code, WebLogic Server authenticates the ID of the user who initiates the execution and then runs the code under a special Kernel Identity user ID. Your applications can use a Java class called NonCatalogLogger to generate log messages instead of using an internationalized message catalog. The severity attribute of a WebLogic Server log message indicates the potential impact of the event or condition that the message reports.
Table lists the severity levels of log messages from WebLogic Server subsystems, starting from the lowest level of impact to the highest. Table Message Severity. Used for messages from the Diagnostic Action Library. Upon enabling diagnostic instrumentation of server and application classes, TRACE messages follow the request path of a method.
A user error has occurred. The system or application can handle the error with no interruption and limited degradation of service. A system or service error has occurred.
The system can recover but there might be a momentary loss or permanent degradation of service. A particular service is in an unusable state while other parts of the system continue to function. Automatic recovery is not possible; the immediate attention of the administrator is needed to resolve the problem. WebLogic Server subsystems generate many messages of lower severity and fewer messages of higher severity.
The log viewer can find and display the messages based on any of the following message attributes: date, subsystem, severity, machine, server, thread, user ID, transaction ID, context ID, timestamp, message ID, or message.
It can also display messages as they are logged or search for past log messages. Click Create to create the domain log filter.
From the Targets tab, as shown in Figure Previous page. Table of content. Next page. The administration server has a local as well as a domainwide log file associated with it. Table ALERT Specifies a specific subsystem has failed and immediate administrative attention is required to recover the subsystem. Subsystem The WebLogic Server subsystem that was the source of the message. User ID The user from the security context that caused the message to be created.
Message ID A six-digit identifier used to uniquely identify the message. Message Description The description of the related event. The following sections describe each of these tabs. Caution If you modify the local log filename, you will need to restart WebLogic Server to enable the logging activities to occur to the new file. Caution Log rotation by time is based on the time stamp of the local log file.
Visual C How to Program 2nd Edition. If you may any questions please contact us: flylib qtcs. Privacy policy. This website uses cookies. Click here to find out more. Accept cookies. Specifies an error has occurred with permanent loss or degradation of service. 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.
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. 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. For more information about changing the mode in which a server starts, see "Change to production mode" in the Oracle WebLogic Server Administration Console Online Help. 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 MB 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. You can specify a different directory location for the archived log files by using the Administration Console or setting the LogFileRotationDir property of the LogFileMBean from the command line.
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. The JVM in. Server as well as application code write directly to these streams instead of using the logging mechanism. Through a configuration option, you can redirect the JVM output to all the registered log destinations, like the server terminal console and log file. When you start the Administration Server, include the following Java option in the weblogic. Server command:. See "weblogic. Skip Headers.
Track log information for individual servers in a cluster. Note: The java. Using Log Severity Levels Each log message has an associated severity level. Using Log Filters To provide more control over the messages that a Logger object publishes, you can create and set a filter.
See Setting a Filter for Loggers and Handlers. Use the Administration Console to manage log files and configure the following logging options: Domain and server log file name and location, rotation pattern, location of archived log files, and number of log files stored. About Log4j Log4j has three main components: loggers, appenders, and layouts. Loggers Log4j defines a Logger class. Appenders Log4j defines appenders handlers to represent destinations for logging output.
Layouts Log4j defines layouts to control the format of log messages. To use Log4j instead of the default Java Logging, complete the following steps: Obtain a copy of the log4j. Example Log4j Code Example import org. Logger; import weblogic. Log4jLoggingHelper; import weblogic. Note: When you use the org. Example Commons Code Example import org.
LogFactory; import org.
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