JenaSystem (Apache Jena)

java.lang.Object
- org.apache.jena.sys.JenaSystem

```
public class JenaSystem
extends java.lang.Object
```
Jena "system" - simple controls for ensuring components are loaded and initialized.
All initialization should be concurrent and thread-safe. In particular, some subsystems need initialization in some sort of order (e.g. ARQ before TDB).
This is achieved by "levels": levels less than 500 are considered "Jena system levels" and are reserved.
- 0 - reserved
- 10 - jena-core
- 20 - RIOT
- 30 - ARQ
- 40 - TDB
- 50-100 - Other Jena system modules.
- 101 - Fuseki
- 102-9998 - Application
- 9999 - other
See also the notes on Jena initialization.

Field Summary

Fields
Modifier and Type Field Description

static boolean DEBUG_INIT
Development support - flag to enable output during initialization.

Constructor Summary

Constructors
Constructor Description

JenaSystem()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`init()`
`static void`	`logLifecycle(java.lang.String fmt, java.lang.Object... args)`	Output a debugging message if DEBUG_INIT is set
`static void`	`shutdown()`

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

- Field Detail
  - DEBUG_INIT
```
public static boolean DEBUG_INIT
```
    Development support - flag to enable output during initialization. Output to System.err, not a logger to avoid the risk of recursive initialization.
- Constructor Detail
  - JenaSystem
```
public JenaSystem()
```
- Method Detail
  - logLifecycle
```
public static void logLifecycle(java.lang.String fmt,
                                java.lang.Object... args)
```
    Output a debugging message if DEBUG_INIT is set
  - init
```
public static void init()
```
  - shutdown
```
public static void shutdown()
```