|Dec 8, 2011|
This document summarizes the functionality and known issues of Java SE for Embedded 6 Update 30 (6u30). Java SE for Embedded 6 Update 30 is based on Java Platform Standard Edition 6 Update 30 (Java SE 6u30) and provides specific features and support for embedded systems.
To ensure that you have the most recent updates of the technical documents for Java SE for Embedded, check the latest versions on the Java SE for Embedded Product Documentation web site.
This release of Java SE for Embedded 6 Update 30 was tested on Linux for ARM, Power Architecture and x86 systems. The requirements of these systems are specified at Java SE for Embedded System Requirements. For ARM, testing was done on the v5, v6 and v7 architectures. Power Architecture systems based on e600 core and e500v2 core architectures were tested. Headless mode was tested on all systems; headful mode was tested on ARM v7.
Some of the information in this document describes support or issues concerning graphics, window managers, audio, and so forth, and therefore only applies to the ARM v7 headful release.
Java SE for Embedded 6 Update 30 includes the new features of Java Platform Standard Edition 6 Update 30. For more information on the cumulative changes of Java SE 6 update 30 release, see Java SE 6 Update Release Notes.
Java SE for Embedded 6 Update 30 does not include the Server (C2) JIT Compiler.
In Java SE for Embedded 6 Update 30, the ARM and Power Architecture
ReservedCodeCacheSize maximum value is 32 megabytes. The reason for
ReservedCodeCacheSize limitation is an architecture restriction on branch offset. The limitation can be overcome by using a non-optimized sequence of instructions. However, this approach introduces a significant performance drop. Currently, JavaVM supports a maximum of 32 megabytes of
ReservedCodeCacheSize for ARM and Power Architecture.
The headful version of Java SE for Embedded 6 Update 30 on Linux ARM does not support the OpenGL acceleration pipeline for Java2D.
Java SE for Embedded 6 Update 30 is based on Java Platform Standard Edition 6 Update 30. Refer to the Java SE 6 Update 30 Release Notes for information on relevant bug fixes.
Java SE for Embedded derives from Java SE, but provides specific features and support for the embedded market on a limited set of supported platforms. The embedded-specific features and support include additional platforms, small footprint JREs (optional files removed), headless configurations, and memory optimizations.
All Java SE for Embedded offerings are Java SE compliant.
Java SE for Embedded provides only the 32-bit "client" version of the Java virtual machine; the 64-bit version is not supported, and using the
-server option has no effect.
For more information on functionality that is generally common to both Java SE 6 and Java SE for Embedded 6, including the Java language, HotSpot VM, Libraries and Tools, see the Java SE Documentation.
See also the Java SE 6 Release Notes for release information on the Java SE 6 platform.
For more information on functionality that is specific to Java SE for Embedded 6, see SE Functionality Specific for Embedded.
The headful version of Java SE for Embedded 6 Update 30 on ARMv7 supports the Java™ Plug-in technology. We have verified that Java SE for Embedded 6 Update 30 works with the Firefox 3.6 web browser. Mozilla's Gecko rendering engine version 1.9.0 FCS or later is required. Non-Mozilla web browsers, including the WebKit rendering engine (used in some non-Mozilla web browsers), are not supported at the time of this writing.
It is important to realize that a symbolic link needs to be created in order to get the Java Plug-in to work. This link points from the browser's
plugins directory to the Java Plug-in shared library included in the JRE and it can be created with the following command from a shell:
ln -s <JAVA_HOME>/lib/arm/libnpjp2.so <MOZILLA_DIR>/plugins/libnpjp2.so
In the above command,
<JAVA_HOME> represents the directory where you installed the headful Java SE for Embedded 6 Update 30 bundle (for example,
<MOZILLA_DIR> represents the directory where you installed your web browser (for example,
For any inquiries related to the Java SE for Embedded product, please contact the Java SE for Embedded team.
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