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Apache Tomcat Configuration Reference - The Loader Component

    The Apache Tomcat Servlet/JSP Container

The Apache Tomcat Servlet/JSP Container

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Top Level Elements

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Nested Components

Apache Tomcat Configuration Reference

The Loader Component

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Introduction

The Loader element represents the web application class loader that will be used to load Java classes and resources for your web application. Such a class loader must follow the requirements of the Servlet Specification, and load classes from the following locations:

  • From the /WEB-INF/classes directory inside your web application.
  • From JAR files in the /WEB-INF/lib directory inside your web application.
  • From resources made available by Catalina to all web applications globally.

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

For a more in-depth description of the class loader hierarchy that is implemented by Catalina, see the ClassLoader HowTo.

The description below uses the variable name $CATALINA_HOME to refer to the directory into which you have installed Tomcat 5, and is the base directory against which most relative paths are resolved. However, if you have configured Tomcat 5 for multiple instances by setting a CATALINA_BASE directory, you should use $CATALINA_BASE instead of $CATALINA_HOME for each of these references.

Attributes
Common Attributes

All implementations of Loader support the following attributes:

AttributeDescription
className

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

delegate

Set to true if you want the class loader to follow the standard Java2 delegation model, and attempt to load classes from parent class loaders before looking inside the web application. Set to false (the default) to have the class loader look inside the web application first, before asking parent class loaders to find requested classes or resources.

reloadable

Set to true if you want Catalina to monitor classes in /WEB-INF/classes/ and /WEB-INF/lib for changes, and automatically reload the web application if a change is detected. This feature is very useful during application development, but it requires significant runtime overhead and is not recommended for use on deployed production applications. You can use the Manager web application, however, to trigger reloads of deployed applications on demand.

NOTE - The value for this property will be inherited from the reloadable attribute you set on the surrounding Context component, and any value you explicitly set here will be replaced.

Standard Implementation

The standard implementation of Loader is org.apache.catalina.loader.WebappLoader. It supports the following additional attributes (in addition to the common attributes listed above):

AttributeDescription
backgroundProcesssorDelay

The number of seconds between checks for modified classes and resources, if reloadable has been set to true.

See the general documentation for this parameter at Host Container.

loaderClass

Java class name of the java.lang.ClassLoader implementation class to use. If not specified, the default value is org.apache.catalina.loader.WebappClassLoader.

useSystemClassLoaderAsParent

If no parent classloader is specified, should the system classloader be used? The default of true mantains backwards compatibility with previous releases however most users will want to set this to false to obtain the parent classloader from the associated container.

This attribute will not be present in Tomcat 6 where the Loader API has changed and the parent class loader is always obtained from the associated container.

Nested Components

No components may be nested inside a Loader element.

Special Features
Logging

A loader is associated with the log category based on its classname.


Copyright © 1999-2006, Apache Software Foundation

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java 1.6, Tomcat 6, MySQL 5, Apache 2.2 and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


Web Hosting, web hosting, JSP, Servlets, Tomcat, website hosting, web site hosting
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