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## Package org.apache.logging.log4j.core.lookup

Log4j 2 Lookups.

See:
Description

Interface Summary
StrLookup | Lookup a String key to a String value.

Class Summary
AbstractLookup | A default lookup for others to extend.
ContextMapLookup | Looks up keys from `ThreadContext` objects..
DateLookup | Formats the current date or the date in the LogEvent.
EnvironmentLookup | Looks up keys from environment variables.
Interpolator | Proxies all the other `StrLookup`s.
JavaLookup | Looks up keys related to Java: Java version, JRE version, VM version, and so on.
JmxRuntimeInputArgumentsLookup | Maps JVM input arguments (but not main arguments) using JMX to acquire JVM arguments.
JndiLookup | Looks up keys from JNDI resources.
MapLookup | A map-based lookup.
ResourceBundleLookup | Looks up keys from resource bundles.
StrMatcher | A matcher class that can be queried to determine if a character array portion matches.
StrSubstitutor | Substitutes variables within a string by values.
StructuredDataLookup | Looks up keys from `StructuredDataMessage` log messages.
SystemPropertiesLookup | Looks up keys from system properties.

## Package org.apache.logging.log4j.core.lookup Description

Log4j 2 Lookups. These are used in variable interpolation in various configuration attributes. `StrLookup` plugins should use the plugin category `Lookup`.

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