
Updating the Liberty Java runtime environment or software development kit
Updating to the latest Java™ version ensures that your Liberty environment receives new features and security fixes.
About this task
- Get the Liberty runtime environment and Java in a single package by installing the Liberty with Java EE 7 Web Profile and IBM® Java SDK 8 ZIP file.
- Use IBM Installation Manager to install Liberty and IBM SDK, Java Technology Edition.
- Separately download and install another specification-compliant JRE or Java SDK, such as IBM SDK, Java Technology Edition, Version 8 or Oracle Java SE.
Procedure
- Update your Liberty installation to at least the minimum fix pack that supports the Java
version. The more recent the fix pack, the more features and fixes are included.
Java SE 8 requires Liberty fix pack 8.5.5.5 or later, and Java SE 7.1 requires fix pack 8.5.5.2 or later. Because of the Liberty zero-migration architecture, you can update your installation with minimal impact to your current applications and configuration.
The method that you use to update Liberty depends on how it was initially installed. If you installed from an archive file, such as a ZIP or JAR file, see Applying a fix pack to a Liberty ZIP archive installation or Applying a fix pack to a Liberty Java archive installation. If you used Installation Manager, see Updating Liberty on distributed operating systems.
- Update the JRE or Java SDK by using one of the following options.
If you installed Liberty from the .zip file with IBM Java SDK 8, you also received the latest Java updates. If you previously installed Liberty from this file and want to independently update the Java SDK, see Updating the Java software development kit in a Liberty ZIP archive installation.
- If you installed Liberty by using Installation Manager, you can also use it to install and
update IBM
Java SDKs. If you use IBM
Java, install one of the common IBM
Java SDKs, such as IBM SDK, Java Technology Edition, Version 8. The
IBM SDKs receive security updates faster than the older WebSphere
Java SDKs because they are not on the WebSphere fix pack schedule. The IBM
Java 8 SDK is also used by WebSphere Application Server traditional V9.0.
For more information about installing IBM Java SDKs by using Installation Manager, see Installing, updating, and uninstalling IBM SDK, Java Technology Edition.
- Install a separately downloaded JRE or Java SDK. You can
install any specification-compliant JRE or Java SDK of a
supported Java version.After you install the JRE or Java SDK, change the Java level that Liberty uses by setting the JAVA_HOME variable.Tip: You can specify the Java SDK or JRE location on the JAVA_HOME property in the server.env file, as described in Customizing the Liberty environment. When you set the JAVA_HOME property in the server.env file, Liberty uses the same Java runtime location regardless of the user profile that the Liberty server runs under.Alternatively, you can set the JAVA_HOME variable on your operating system:
Go to System > Advanced system settings. In the Advanced tab of the System Properties window, click Environment Variables. Add or edit the JAVA_HOME system variable so that it points to the jre directory of the Java installation, such as C:\Program Files\IBM\Java80\jre.
If you are running bash shell, you can add the JAVA_HOME environment variable to the .bashrc file in the user's home directory.
- Check for any deprecations or incompatibilities by scanning your applications with the
Migration Toolkit.
In most cases, Java SE specifications are upwards binary-compatible with previous Java SE versions, except for the incompatibilities and deprecations that are documented in the Oracle Compatibility Guide for JDK 8 and Java SE 7 and JDK 7 Compatibility.
The Migration Toolkit consists of two separate tools, the Migration Toolkit for Application Binaries and the Eclipse-based WebSphere Application Server Migration Toolkit.- The application binary scanner provides a detailed migration analysis report for your application, so you can better understand the type and scope of changes that the application might require.
- When you migrate your applications, the Eclipse-based Migration Toolkit provides quick fixes to automatically update your source when possible and provides detailed help for items that must be manually updated.
For more information and to download the toolkit, see the Migration Toolkit on WASdev.


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