SystemPropertySource (Apache Tomcat 10.0.27 API Documentation)

java.lang.Object
- org.apache.tomcat.util.digester.SystemPropertySource

All Implemented Interfaces:

IntrospectionUtils.PropertySource, IntrospectionUtils.SecurePropertySource
```
public class SystemPropertySource
extends java.lang.Object
implements IntrospectionUtils.SecurePropertySource
```
A IntrospectionUtils.SecurePropertySource that uses system properties to resolve expressions. This property source is always active by default.

See Also:

Digester

Constructor Summary

Constructors
Constructor Description

SystemPropertySource()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.String`	`getProperty(java.lang.String key)`
`java.lang.String`	`getProperty(java.lang.String key, java.lang.ClassLoader classLoader)`	Obtain a property value, checking that code associated with the provided class loader has permission to access the property.

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

- Constructor Detail
  - SystemPropertySource
```
public SystemPropertySource()
```
- Method Detail
  - getProperty
```
public java.lang.String getProperty(java.lang.String key)
```
    Specified by:
    
    getProperty in interface IntrospectionUtils.PropertySource
  - getProperty
```
public java.lang.String getProperty(java.lang.String key,
                                    java.lang.ClassLoader classLoader)
```
    Description copied from interface: IntrospectionUtils.SecurePropertySource
    
    Obtain a property value, checking that code associated with the provided class loader has permission to access the property. If the classLoader is null or if classLoader does not implement PermissionCheck then the property value will be looked up without a call to PermissionCheck.check(java.security.Permission)
    
    Specified by:
    
    getProperty in interface IntrospectionUtils.SecurePropertySource
    
    Parameters:
    
    key - The key of the requested property
    
    classLoader - The class loader associated with the code that trigger the property lookup
    
    Returns:
    
    The property value or null if it could not be found or if PermissionCheck.check(java.security.Permission) fails