org.apache.logging.log4j.util

Class Constants



  • public final class Constants
    extends Object
    Log4j API Constants.
    Since:
    2.6.2
    • Field Detail

      • IS_WEB_APP

        public static final boolean IS_WEB_APP
        true if we think we are running in a web container, based on the boolean value of system property "log4j2.is.webapp", or (if this system property is not set) whether the javax.servlet.Servlet class is present in the classpath.
      • ENABLE_THREADLOCALS

        public static final boolean ENABLE_THREADLOCALS
        Kill switch for object pooling in ThreadLocals that enables much of the LOG4J2-1270 no-GC behaviour.

        True for non-web apps, disable by setting system property "log4j2.enable.threadlocals" to "false".

      • JAVA_MAJOR_VERSION

        public static final int JAVA_MAJOR_VERSION
        Java major version.
      • MAX_REUSABLE_MESSAGE_SIZE

        public static final int MAX_REUSABLE_MESSAGE_SIZE
        Maximum size of the StringBuilders used in RingBuffer LogEvents to store the contents of reusable Messages. After a large message has been delivered to the appenders, the StringBuilder is trimmed to this size.

        The default value is , which allows the StringBuilder to resize three times from its initial size. Users can override with system property "log4j.maxReusableMsgSize".

        Since:
        2.9
      • LOG4J2_DEBUG

        public static final String LOG4J2_DEBUG
        Name of the system property that will turn on TRACE level internal log4j2 status logging.

        If system property "log4j2.debug" is either defined empty or its value equals to true (ignoring case), all internal log4j2 logging will be printed to the console. The presence of this system property overrides any value set in the configuration's <Configuration status="<level>" ...> status attribute, as well as any value set for system property org.apache.logging.log4j.simplelog.StatusLogger.level.

        See Also:
        Constant Field Values
      • EMPTY_OBJECT_ARRAY

        public static final Object[] EMPTY_OBJECT_ARRAY
        The empty array.
      • EMPTY_BYTE_ARRAY

        public static final byte[] EMPTY_BYTE_ARRAY
        The empty array.

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