在上ubuntu11.10,下载和编译openJdk7源码

• Install relevant packages:

sudo apt-get install ant build-essential openjdk-6-jdk
sudo apt-get build-dep openjdk-6-jdk

sudo apt-get install mercurial

• Find the master OpenJDK Mercurial repository you want to start from. These instructions will usejdk7u2.
• Command examples contain settings to allow Internet access through a proxy server; remove them if they are unnecessary for you.
• Clone the Mercurial top-level forest repository:

• $ mkdir jdk7u2
  $ cd jdk7u2
  $ hg --config http_proxy.host=proxy:1234 clone http://hg.openjdk.java.net/jdk7u/jdk7u2 forest
  $ cd forest
  $ sh ./get_source.sh

  The build will fail while compiling the sound libraries. As suggested here, use the following to patch the appropriate Makefile:
  

• $ echo -e "--- old/jdk/make/javax/sound/jsoundalsa/Makefile    2012-01-28 12:00:00.000000000 -0500\n+++ new/jdk/make/javax/sound/jsoundalsa/Makefile    2012-01-28 12:00:00.000000000 -0500\n@@ -65,7 +65,7 @@\n \t\$(MIDIFILES_export) \\\\\n \t\$(PORTFILES_export)\n\n-LDFLAGS += -lasound\n+EXTRA_LIBS += -lasound\n \n CPPFLAGS += \\\\\n \t-DUSE_DAUDIO=TRUE \\\\" | patch -p1

  Compile:
  

• $ export LANG=C ALT_BOOTDIR=/usr/lib/jvm/java-6-openjdk ANT_OPTS="-Dhttp.proxyHost=proxy -Dhttp.proxyPort=1234 -Dhttps.proxyHost=proxy -Dhttps.proxyPort=1234"
  $ . jdk/make/jdk_generic_profile.sh
  $ make ALLOW_DOWNLOADS=true fastdebug_build

  • The compile will take a while.
  • Verify the build

  $ build/linux-amd64-fastdebug/j2sdk-image/bin/java -version
  openjdk version "1.7.0-internal-fastdebug"
  OpenJDK Runtime Environment (build 1.7.0-internal-fastdebug-user_2012_01_28_13_25-b00)
  OpenJDK 64-Bit Server VM (build 22.0-b10-fastdebug, mixed mode)
  $ build/linux-amd64-fastdebug/j2sdk-image/bin/java -XX:+AggressiveOpts -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -XX:+PrintFlagsWithComments -version

  If you have problems along the way, begin by reading The OpenJDK Developers' Guide and theOpenJDK Build README.