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    The Apache Tomcat Servlet/JSP Container

    Apache Tomcat 7

    Version 7.0.47, Oct 18 2013
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    The Jar Scanner Component

    Table of Contents
    Introduction

    The Jar Scanner element represents the component that is used to scan the web application for JAR files. It is typically used during web application start to identify configuration files such as TLDs or web-fragment.xml files that must be processed as part of the web application initialisation.

    A Jar Scanner element MAY be nested inside a Context component. If it is not included, a default Jar Scanner configuration will be created automatically, which is sufficient for most requirements.

    Attributes
    Common Attributes

    All implementations of Jar Scanner support the following attributes:

    AttributeDescription
    className

    Java class name of the implementation to use. This class must implement the org.apache.tomcat.JarScanner interface. If not specified, the standard value (defined below) will be used.

    Standard Implementation

    The standard implementation of Jar Scanner is org.apache.tomcat.util.scan.StandardJarScanner. It supports the following additional attributes (in addition to the common attributes listed above):

    AttributeDescription
    scanAllDirectories

    If true, any directories found on the classpath will be checked to see if are expanded Jar files. The default is false. Tomcat determines if directory is an expanded JAR file by looking for a META-INF sub-directory. Only if the META-INF sub-directory exists, is the directory to be an expanded JAR file.

    scanAllFiles

    If true, any files found on the classpath will be checked to see if they are Jar files rather than relying on the file extension being .jar. The default is false

    scanClassPath

    If true, the full web application classpath, including the shared and common classloaders and the system classpath (but not the bootstrap classpath) will be scanned for Jar files in addition to the web application. The default is true.

    scanBootstrapClassPath

    If scanClassPath is true and this is true the bootstrap classpath will also be scanned for Jar files. The default is false.

    Nested Components

    No components may be nested inside a Jar Scanner element.

    Special Features

    No special features are associated with a Jar Scanner element.

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