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## org.apache.tapestry5.ioc.internal.services
Class SystemPropertiesSymbolProvider

    java.lang.Object
      org.apache.tapestry5.ioc.internal.services.SystemPropertiesSymbolProvider

All Implemented Interfaces:
  SymbolProvider

    public class SystemPropertiesSymbolProvider

extends java.lang.Object
implements SymbolProvider

Obtains symbol values from JVM System properties. This implementation is usually ordered first, so that explicit overrides, provided as JVM system properties, can take effect.

Constructor Summary
`SystemPropertiesSymbolProvider()`

Method Summary
`java.lang.String` | `valueForSymbol(java.lang.String symbolName)` Returns the value for the symbol, or null if this provider can not provide a value.

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

Constructor Detail

### SystemPropertiesSymbolProvider

    public SystemPropertiesSymbolProvider()

Method Detail

### valueForSymbol

    public java.lang.String valueForSymbol(java.lang.String symbolName)

  Description copied from interface: `SymbolProvider`
  Returns the value for the symbol, or null if this provider can not provide a value. The value itself may contain symbols that will be recursively expanded.

  Specified by:
    `valueForSymbol` in interface `SymbolProvider`
  Returns:
    the value or null

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