ExtensionValidator (Apache Tomcat 9.0.120 API Documentation)
Description: declaration: package: org.apache.catalina.util, class: ExtensionValidator

# Class ExtensionValidator

java.lang.Object
org.apache.catalina.util.ExtensionValidator

public final class ExtensionValidator extends Object
Ensures that all extension dependencies are resolved for a WEB application are met. This class builds a list of extensions available to an application and then validates those extensions. See http://docs.oracle.com/javase/1.4.2/docs/guide/extensions/spec.html for a detailed explanation of the extension mechanism in Java.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ExtensionValidator()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static void`
  `addSystemResource(File jarFile)`
  Checks to see if the given system JAR file contains a MANIFEST, and adds it to the container's manifest resources.
  `static boolean`
  `validateApplication(WebResourceRoot resources, Context context)`
  Runtime validation of a Web Application.

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### ExtensionValidator

    public ExtensionValidator()

- ## Method Details

  - ### validateApplication

    public static boolean validateApplication(WebResourceRoot resources, Context context) throws IOException
    Runtime validation of a Web Application. This method uses JNDI to look up the resources located under a `DirContext`. It locates Web Application MANIFEST.MF file in the /META-INF/ directory of the application and all MANIFEST.MF files in each JAR file located in the WEB-INF/lib directory and creates an `ArrayList` of `ManifestResource` objects. These objects are then passed to the validateManifestResources method for validation.
    Parameters:
      `resources` - The resources configured for this Web Application
      `context` - The context from which the Logger and path to the application
    Returns:
      true if all required extensions satisfied
    Throws:
      `IOException` - Error reading resources needed for validation

  - ### addSystemResource

    public static void addSystemResource(File jarFile) throws IOException
    Checks to see if the given system JAR file contains a MANIFEST, and adds it to the container's manifest resources.
    Parameters:
      `jarFile` - The system JAR whose manifest to add
    Throws:
      `IOException` - Error reading JAR file