Mercurial > hg > release > icedtea6-1.6
view README @ 1747:6aee53732aa2 default tip
Force Event Dispatch Thread to always get created so its contextclassloader will be
set properly.
author | Man Lung Wong <mwong@redhat.com> |
---|---|
date | Fri, 30 Jul 2010 16:37:21 -0400 |
parents | 07fdd12537a6 |
children |
line wrap: on
line source
IcedTea6 ======== The IcedTea project provides a harness to build the source code from openjdk.java.net using Free Software tools and dependencies. IcedTea addresses two problems: it eliminates the build requirement on proprietary build tools and it provides implementations of Java Web Start and the browser plugin which are missing from OpenJDK. It also provides support for additional architectures via Zero/Shark or the CACAO VM. IcedTea also provides build scripts and patches that fix a number of issues which are as yet unresolved upstream. See INSTALL for build instructions. Homepage (wiki): http://icedtea.classpath.org/ Bugs (bugzilla): http://icedtea.classpath.org/bugzilla Mailing List: distro-pkg-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/distro-pkg-dev FAQ: http://icedtea.classpath.org/wiki/FrequentlyAskedQuestions Anonymous Mercurial checkout: hg clone http://icedtea.classpath.org/hg/icedtea6 Java compatibility ------------------ IcedTea6 is derived from OpenJDK6, Oracle's open-source implementation of the Java SE 6 platform and implements the Java SE 6 Platform Specification. Binaries produced by IcedTea6 have been known to pass the TCK for Java 6. IcedTea6 additionally provides autotools support, plugin and Web Start support, ARM support, and a LLVM-based JIT (Shark) for architectures beyond x86, x86_64 and SPARC, the architectures supported by HotSpot JITs in OpenJDK6. A Note About License Headers ---------------------------- Some sources downloaded from openjdk.java.net do not display the GPL license header. Instances are: - We are assuming that these files are owned by Sun: openjdk/jdk/src/share/classes/**/resources/*.properties Web Browser Plugin support =========================== IcedTea adds a browser plugin to OpenJDK. IcedTea6 1.7 includes two versions. The default, and currently supported, version is a rewrite called NPPlugin, developed to support recent Mozilla API changes. It is based on the old gcjwebplugin and has LiveConnect support. The old plugin used by IcedTea6 1.6 and earlier is also included, but will not work with xulrunner 1.9.2 and up. You are welcome to use the old plugin by supplying the --disable-npplugin option to configure, but please note that such a configuration is no longer supported and any bugs filed against it will be closed. NetX ==== NetX provides a drop-in replacement for javaws (Java Web Start). Since upstream NetX is dormant, we will be hosting and modifying the sources in the IcedTea repository, particularly in the rt/net/sourceforge/jnlp directory. The NetX sources are built into rt.jar using the same method as CORBA, JAXWS, JAXP and langtools. IcedTea's NetX currently supports verification of signed jars, trusted certificate storing, system certificate store checking, and provides the services specified by the jnlp API. The Zero Assembler and Shark Ports ================================== Gary Benson has developed a port of the interpreter included in the HotSpot virtual machine which avoids using any assembly language. As a pure C++ interpreter, it should be possible to build this on most architectures and have a working (albeit slow) version of OpenJDK. Successful builds have been made on ppc, ppc64 and arm. The zero assembler port is enabled by default on platforms other than x86, x86_64 and sparc. To enable it on these platforms, use the --enable-zero option. Gary is now working on a JIT called Shark to provide better performance on platforms which need to use the zero port. A preliminary version of this is now included with IcedTea and can be built with the --enable-shark option. CACAO as VM =========== The CACAO virtual machine (http://cacaovm.org) can be used as an alternative to the HotSpot virtual machine. One advantage of this is that it already provides a JIT for many platforms to which HotSpot has not yet been ported, including ppc, ppc64, arm and mips. To use CACAO as the VM, use the --with-cacao option. This will download version 0.99.4 of CACAO during the build, which has been tested with this version of IcedTea6. The environment variable CACAO_CONFIGURE_ARGS can be used to pass additional arguments to the cacao configure. PulseAudio Mixer ================ Passing --enable-pulse-java to configure will build the PulseAudio Mixer for java. This allows java programs to use PulseAudio as the sound backend. SystemTap Support ================= The --enable-systemtap configure option will try to find the systemtap runtime development files (sdt.h and the dtrace python script wrapper), enable compilation of static markers in the hotspot code and install a systemtap hotspot.stp tapset for easy tracing with systemtap's stap utility. The probes are documented in tapset/hotspot.stp. This requires the systemtap-sdt-devel package as build dependency and optionally the systemtap package at run time when the user want to use the tapset to trace java programs. The probes have zero overhead when not used and can safely be compiled in even when not used at runtime. Support for Additional VMs ========================== Although IcedTea can be built multiple times to use a different virtual machine, additional VMs can be built without building the other components multiple times. On architectures where hotspot is available, use --with-additional-vms=cacao,zero (or shark instead of zero) on architectures where only zero (or shark) is available, use --with-additional-vms=cacao to build the additional VM's. It's not possible to build cacao as the default VM, and zero as additional VM. If the build was configured with --with-additional-vms, the additional VM's are available by calling the java with the option `-cacao' or `-zero' (for shark as well), or by calling the java tools with `-J-<vm name>'.