SYSTEM AND METHOD FOR CLASSLOADING IN A MULTITENANT APPLICATION SERVER ENVIRONMENT

• US 20160094626A1
• Filed: 09/25/2015
• Published: 03/31/2016
• Est. Priority Date: 01/21/2014
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: Oracle International Corporation (Oracle Corporation)
• Inventors: BAJAJ, ASEEM, FEIGEN, LAWRENCE, ATSATT, BRYAN
• Granted Patent: US 10,356,161 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 9/44521 Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04L 67/34 involving the movement of software or configuration parameters network booting or remote initial program loading [RIPL] G06F9/4416

Abstract

In accordance with an embodiment, described herein is a system and method for classloading in a multitenant application server environment. The system includes a domain with a plurality of partitions, and a resource group template including one or more applications, each configured with code shareable across the plurality of partitions. A class loader hierarchy can be created for each application instance in a partition, wherein the class loader hierarchy includes a class loader structure for that application instance, a partition class loader for the partition, and a shared application class loader for all instances of that application. At runtime, the class loader structure for an application instance can use the partition class loader as a parent class loader to load classes visible to the partition, and use the shared application class loader as an alternative parent class loader.

Claims

1. A system for classloading in a multitenant application server environment, comprising:

one or more computers, each including a microprocessor;

an application server environment executing on the one or more computers, wherein the application server environment includes a domain with a plurality of partitions, and a plurality of applications, wherein each application is configured with a jar shareable across the plurality of partitions;

a class loader hierarchy that includes a class loader structure for each application instance in a partition, a partition class loader for each partition, and a shared application class loader for each application;

wherein the class loader structure of a particular application instance is configured to use the partition class loader as a parent class loader, and use the shared application class loader as an alternative parent class loader.

2. The system of claim 1, wherein the shareable jar in each application is configured using an application deployment descriptor.

3. The system of claim 1, wherein the partition class loader load classes for all application instances within the partition.

4. The system of claim 1, wherein the partition class loader is created when a first application is being deployed to the partition through a resource group template.

5. The system of claim 1, wherein the partition class loader is removed when the partition is being removed and a last application for the partition is being undeployed.

6. The system of claim 1, wherein the shared application class loader loads classes to be shared by each application instance of an application deployed to the plurality of partitions.

7. The system of claim 1, wherein the shared application class loader is created when the application is being deployed to a first partition from a resource group template.

8. The system of claim 1, wherein the shared application class loader is removed when the application is being removed from the resource group template and the application is being undeployed for a last partition.

9. The system of claim 1, the class loaders resides on a single application server instance.

10. A method for providing a partition classloader in a multitenant application server environment, comprising:

providing an application server environment executing on one or more computers, wherein the application server environment includes a domain with a plurality of partitions, and a plurality of applications, wherein each application is configured with a jar shareable across the plurality of partitions;

creating a class loader hierarchy that includes a class loader structure for each application instance in a partition, a partition class loader for each partition, and a shared application class loader for each application;

configuring the class loader structure of a particular application instance is configured to use the partition class loader as a parent class loader, and use the shared application class loader as an alternative parent class loader.

11. The method of claim 10, wherein the shareable jar in each application is configured using an application deployment descriptor.

12. The method of claim 10, wherein the partition class loader load classes for all application instances within the partition.

13. The method of claim 10, wherein the partition class loader is created when a first application is being deployed to the partition through a resource group template.

14. The method of claim 10, wherein the partition class loader is removed when the partition is being removed and a last application for the partition is being undeployed.

15. The method of claim 10, wherein the shared application class loader loads classes to be shared by each application instance of an application deployed to the plurality of partitions.

16. The method of claim 10, wherein the shared application class loader is created when the application is being deployed to a first partition from a resource group template.

17. The method of claim 10, wherein the shared application class loader is removed when the application is being removed from a resource group template and the application is being undeployed for a last partition.

18. The method of claim 10, the class loaders resides on a single application server instance.

19. A non-transitory computer readable storage medium, including instructions stored thereon which when read and executed by one or more computers cause the one or more computers to perform the steps comprising:

providing an application server environment executing on one or more computers, wherein the application server environment includes a domain with a plurality of partitions, and a plurality of applications, wherein each application is configured with a jar shareable across the plurality of partitions;

creating a class loader hierarchy that includes a class loader structure for each application instance in a partition, a partition class loader for each partition, and a shared application class loader for each application;

configuring the class loader structure of a particular application instance is configured to use the partition class loader as a parent class loader, and use the shared application class loader as an alternative parent class loader.

20. The non-transitory computer readable storage medium of claim 19, the class loaders resides on a single application server instance.