6.4 System Services
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## 6.4 System Services

### 6.4.1 The Exception system

Phing uses the PHP5 try/catch/throw Exception system. Phing defines a number of Exception subclasses for more fine-grained handling of Exceptions. Low level Exceptions that cannot be handled will be wrapped in a `BuildException` and caught by the outer-most catch() {} block.

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6.3 System Initialization | Home | 6.5 Build Lifecycle