|Oracle® JRockit Upgrade Guide
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This document contains information to help you upgrade to the Oracle JRockit JDK R28.0, which is a new, major release of the Oracle JRockit JDK.
For information about the new features and changes in R28.0 when compared with R27, see the Oracle JRockit Release Notes.
If you are upgrading from a pre-R27 release, then you might want to read the release notes pertaining to the previous releases to understand the changes in each release:
Oracle JRockit JDK R27.x
Oracle JRockit JDK R26.x
Oracle JRockit JDK 5.0
Oracle JRockit JDK 1.4.2
Oracle JRockit JDK 7.0
This document contains the following topics:
Ensure that the Oracle JRockit JVM is deployed on a supported configuration.
For information about operating systems and hardware platforms that the Oracle JRockit JDK supports, see Oracle JRockit JDK Supported Configurations at
Oracle JRockit JDK R28.0 supports the following Java versions. Ensure that your application complies with the Java specification corresponding to the JRockit JDK release that you use.
|Oracle JRockit JDK Release||Supported Java Version||Java API Specification|
|Oracle JRockit JDK 5.0 R28.0||J2SE 5.0||
|Oracle JRockit JDK 6 R28.0||Java SE 6||
For information about the Java version updates supported by the Oracle JRockit JDK, see the Oracle JRockit Release Notes.
Note:Oracle JRockit JDK R28.0 does not support J2SE 1.4.2 and earlier Java versions.
So before upgrading to R28.0 from any of the following releases, ensure that the application is compatible with either J2SE 5.0 or Java SE 6.
Oracle JRockit JDK 1.4.2 R27
Oracle JRockit JDK 1.4.2 R26
Oracle JRockit JDK 1.4.2 R24
Oracle JRockit JDK 8.1
Oracle JRockit JDK 7.0 SP6 R23
This section describes tasks that you must perform when upgrading to JRockit JVM R28.
After installing the Oracle JRockit JDK, verify the JVM release number by using the
java -version command.
The JRockit JDK release number consists of two elements:
The JRockit JVM release number (for example, R28.0.0)
The Java version number (for example, 1.6.0_17)
Consider using as few JVM startup options as possible. For the startup options that you decide to use, make sure that you understand how they work by reading about them in the Oracle JRockit Command Line Reference.
The Oracle JRockit JDK R28.0 release includes several new
-XX command-line options (see "New Command-Line Options in Oracle JRockit R28.0"), some of which are equivalents for deprecated options ("Deprecated Command-Line Options in Oracle JRockit R28.0").
If your application startup command contains any of the deprecated options, modify the startup command to use equivalent other options.
Before upgrading the production environment, test the application in a controlled staging environment. The staging environment should be as similar as possible to the required production environment. This includes hardware, software, usage patterns, and load.
Applications are sometimes sensitive to timing. A JRockit JVM upgrade can sometimes expose errors in your application; for example, dependencies on unspecified behavior or APIs. Timing differences introduced when upgrading the JVM may, for instance, expose erroneous synchronization.
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Oracle JRockit Upgrade Guide Release R28.0
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