JavaLookup (Apache Log4j 2 2.17.1 API)

java.lang.Object
- org.apache.logging.log4j.core.lookup.AbstractLookup
- - org.apache.logging.log4j.core.lookup.JavaLookup

All Implemented Interfaces:

StrLookup
```
@Plugin(name="java",
        category="Lookup")
public class JavaLookup
extends AbstractLookup
```
Looks up keys related to Java: Java version, JRE version, VM version, and so on.

Field Summary
- Fields inherited from interface org.apache.logging.log4j.core.lookup.StrLookup
  CATEGORY

Constructor Summary

Constructors
Constructor Description

JavaLookup()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`getHardware()`	Accessible through the Lookup key `hw`.
`String`	`getLocale()`	Accessible through the Lookup key `locale`.
`String`	`getOperatingSystem()`	Accessible through the Lookup key `os`.
`String`	`getRuntime()`	Accessible through the Lookup key `runtime`.
`String`	`getVirtualMachine()`	Accessible through the Lookup key `vm`.
`String`	`lookup(LogEvent event, String key)`	Looks up the value of the environment variable.

Methods inherited from class org.apache.logging.log4j.core.lookup.AbstractLookup
lookup

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - JavaLookup
```
public JavaLookup()
```
- Method Detail
  - getHardware
```
public String getHardware()
```
    Accessible through the Lookup key hw.
    
    Returns:
    
    hardware processor information.
  - getLocale
```
public String getLocale()
```
    Accessible through the Lookup key locale.
    
    Returns:
    
    system locale and file encoding information.
  - getOperatingSystem
```
public String getOperatingSystem()
```
    Accessible through the Lookup key os.
    
    Returns:
    
    operating system information.
  - getRuntime
```
public String getRuntime()
```
    Accessible through the Lookup key runtime.
    
    Returns:
    
    Java Runtime Environment information.
  - getVirtualMachine
```
public String getVirtualMachine()
```
    Accessible through the Lookup key vm.
    
    Returns:
    
    Java Virtual Machine information.
  - lookup
```
public String lookup(LogEvent event,
                     String key)
```
    Looks up the value of the environment variable.
    
    Parameters:
    
    event - The current LogEvent (is ignored by this StrLookup).
    
    key - the key to be looked up, may be null
    
    Returns:
    
    The value of the environment variable.