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Java™ SE for Embedded 7 Update 4 Runtime Environment

This document summarizes the functionality and known issues of Java SE for Embedded 7 Update 4 (7u4). Java SE for Embedded 7 Update 4 is based on Java Platform Standard Edition 7 Update 4 (Java SE 7u4) 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.

Contents

Platform Support

What's New in This Release

Known Limitations

Bug Fixes

Comparison Between Java SE and Java SE for Embedded

How to Enable Java Plug-In

Contact Us


Platform Support

This release of Java SE for Embedded 7 Update 4 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 headful release on ARMv7.

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What's New in This Release

Java SE for Embedded 7 Update 4 includes the new features of Java Platform Standard Edition 7 Update 4. For more information on the cumulative changes of Java SE 7 update 4 release, see Java SE 7 Update Release Notes.

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Known Limitations

ARM and PPC ReservedCodeCacheSize Maximum Value is 32 Megabytes

In Java SE for Embedded 7 Update 4, 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.

OpenGL Limitation

The headful version of Java SE for Embedded 7 Update 4 on Linux ARM does not support the OpenGL acceleration pipeline for Java2D.

Garbage First Garbage Collector Not Supported

Java SE for Embedded 7 Update 4 does not support the Garbage First(G1) garbage collector.

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Bug Fixes

Bug Database - In most cases, the bug ID number for each bug fixed is a link to the detailed bug report on the Bug Database web site. Bug Database enables you to file your own bug reports, add comments to existing bug reports, and vote for the bugs you consider most important.

The following list includes some of the notable bug fixes in Java SE Embedded 7 Update 4.

Bug ID Category Sub-Category Description
7050298  hotspot embedded ARM: SIGSEGV in JNIHandleBlock::allocate_handle
7125769  hotspot embedded ARM: SEGV on panda with linaro 3.1.1 running specjvm2008
7099574  hotspot embedded ARM: guarantee(obj->mark() == markOopDesc::encode(mid)) failed: invariant

Java SE for Embedded 7 Update 4 is based on Java SE 7 Update 4. Refer to Java SE 7 Update 4 Release Notes for additional information on relevant bug fixes.

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Comparison Between Java SE and Java SE for Embedded

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.

On most platforms, 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.

Server Compiler support on ARM is introduced in Java SE for Embedded 7 Update 2. See Server Compiler Technology section of Java SE for Embedded 7 Update 2 Release Notes for support details.

For more information on functionality that is generally common to both Standard Java SE 7 and Java SE for Embedded 7, including the Java language, HotSpot VM, Libraries and Tools, see the Java SE Documentation.

See also the Java SE 7 Release Notes for release information on the Java SE 7 platform.

For more information on functionality that is specific to Java SE for Embedded 7, see SE Functionality Specific for Embedded.

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How to Enable Java Plug-In

The headful version of Java SE for Embedded 7 Update 4 on ARMv7 supports Java™ Plug-In technology. (See Applet Developer's Guide for more information.) We have verified that Java SE for Embedded 7 Update 4 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.

A symbolic link needs to be created in order to get the Java Plug-In to work. This link should point 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 7 Update 4 bundle (for example, /usr/java/ejre1.7.0_4), and <MOZILLA_DIR> represents the directory where you installed your web browser (for example, /usr/lib/mozilla).

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Contact Us

For Java SE for Embedded product inquiries, please contact the Java SE for Embedded team.

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