# Package org.apache.struts2.ognl

- Interface Summary
  Interface | Description
  --- | ---
  OgnlGuard | Guards all expressions parsed by Struts Core.

- Class Summary
  Class | Description
  --- | ---
  ProviderAllowlist | Allows `ConfigurationProvider`s to register classes that should be allowed to be used in OGNL expressions.
  StrutsOgnlGuard | The default implementation of `OgnlGuard`.
  ThreadAllowlist | Allows any bean to allowlist a class for use in OGNL expressions, for the current thread only.

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