Below are a definition, preconditions for installing and uninstalling, and an example of a deployable unit.

What is a deployable unit?

A deployable unit is a jar file that can be installed in the SLEE. It contains:

  • a deployment descriptor

  • constituent jar files, with Java class files and deployment descriptors for components such as:

    • SBBs

    • events

    • profile specifications

    • resource adaptor types

    • resource adaptors

    • libraries

  • XML files for services.

Note The JAIN SLEE 1.1 specification defines the structure of a deployable unit.

Installing and uninstalling deployable units

You must install and uninstall deployable units in a particular order, according to the dependencies of the SLEE components they contain. You cannot install a deployable unit unless either it contains all of its dependencies, or they are already installed. For example, if your deployable unit contains an SBB which depends on a library jar, the library jar must either already be installed in the SLEE, or be included in that same deployable unit jar.

Pre-conditions

A deployable unit cannot be installed if any of the following is true:

  • A deployable unit with the same URL has already been installed in the SLEE.

  • The deployable unit contains a component with the same name, vendor and version as a component of the same type that is already installed in the SLEE.

  • The deployable unit contains a component that references other components that are not yet installed in the SLEE and are not included in the deployable unit jar. (For example, an SBB component may reference event-type components and profile-specification components that are not included or pre-installed.)

A deployable unit cannot be uninstalled if either of the following is true:

  • There are any dependencies on any of its components from components in other installed deployable units. For example, if a deployable unit contains an SBB jar that depends on a profile-specification jar contained in a second deployable unit, the deployable unit containing the profile-specification jar cannot be uninstalled while the deployable unit containing the SBB jar remains installed.

  • There are "instances" of components contained in the deployable unit. For example, a deployable unit containing a resource adaptor cannot be uninstalled if the SLEE includes resource adaptor entities of that resource adaptor.

Deployable unit example

The following example illustrates the deployment descriptor for a deployable unit jar file:

<deployable-unit>
<description> ... </description>
...
<jar> SomeProfileSpec.jar </jar>
<jar> BarAddressProfileSpec.jar </jar>
<jar> SomeCustomEvent.jar </jar>
<jar> FooSBB.jar </jar>
<jar> BarSBB.jar </jar>
...
<service-xml> FooService.xml </service-xml>
...
</deployable-unit>

The content of the deployable unit jar file is as follows:

META-INF/deployable-unit.xml
META-INF/MANIFEST.MF
...
SomeProfileSpec.jar
BarAddressProfileSpec.jar
SomeCustomEvent.jar
FooSBB.jar
BarSBB.jar
FooService.xml
...
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