今天学习《深入理解Java虚拟机：JVM高级特性与最佳实践》一书，并动手在Linux系统上编译OpenJDK 7，初次搞不太顺利，特记录下编译操作细节。

一、前期准备

约定：工具默认安装目录是/usr/local/，若有源码，则源码存放在/usr/local/src/目录下，笔者用到的工具已打包上传到百度云：https://pan.baidu.com/s/1WhsQHJvduK75EBE8lQqq9g

　　1、编译需要的相关工具

　　　　yum -y install gcc gcc-c++ alsa-lib alsa-lib-devel libXrender libXrender-devel libXi-devel libXt-devel libXtst-devel cups cups-devel

2、FreeType

笔者使用的是freetype-2.4.0.tar.gz，下载地址：https://sourceforge.net/projects/freetype/files/freetype2/2.4.0/

tar -zxvf freetype-2.4.0.tar.gz  　　# 解压

cd freetype-2.4.0

./configure && make && make install  　　# 编译安装

3、Apache Ant

笔者使用的是apache-ant-1.9.7-bin.tar.gz，下载地址：https://archive.apache.org/dist/ant/binaries/

tar -zxvf apache-ant-1.9.7-bin.tar.gz　　# 解压

mv apache-ant-1.9.7 /usr/local/

ln -s /usr/local/apache-ant-1.9.7/bin/ant /usr/bin/ant　　# 软链接到bin

4、BootstrapJDK

笔者使用的是jdk-6u45-linux-x64，因为源码更多是使用Java写的，因此需要使用一个可用的JDK去编译（详见深入理解Java虚拟机第一章），OpenJDK解压目录下有个README-builds.html<OpenJDK Build README>，建议详看一遍，文档说使用JDK 6

下载jdk-6u45-linux-x64.bin，下载地址：http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase6-419409.html

./jdk-6u45-linux-x64.bin  　　# 解压

mv jdk1.6.0_45 /usr/local/　　# 移动目录

　　5、OpenJDK

下载OpenJDK 7，地址：http://download.java.net/openjdk/jdk7/promoted/b147/openjdk-7-fcs-src-b147-27_jun_2011.zip，文件校验码：http://download.java.net/openjdk/jdk7/promoted/b147/openjdk-7-fcs-src-b147-27_jun_2011.md5

wget http://download.java.net/openjdk/jdk7/promoted/b147/openjdk-7-fcs-src-b147-27_jun_2011.zip 　　# 下载

unzip openjdk-7-fcs-src-b147-27_jun_2011.zip 　　# 解压

mv openjdk openjdk7　　# 更改目录名

mkdir /usr/local/openjdk7　　# 创建编译结果存放目录

二、配置环境变量

vim /etc/profile　　# 在末尾加入以下内容注意各个目录Path

# openjdk 7 build
export ANT_HOME=/usr/local/apache-ant-1.9.7
export ALT_FREETYPE_HEADERS_PATH=/usr/local/include/freetype2
export ALT_FREETYPE_LIB_PATH=/usr/local/lib
export ALT_DROPS_DIR=/usr/local/src/openjdk7/drop
export ALT_BOOTDIR=/usr/local/jdk1.6.0_45
export ALT_JDK_IMPORT_PATH=/usr/local/jdk1.6.0_45
export ALT_OUTPUTDIR=/usr/local/openjdk7
export LANG=C　　# default: en_US.UTF-8
export HOTSPOT_BUILD_JOBS=8
export ALT_PARALLEL_COMPILE_JOBS=8
export SKIP_COMPARE_IMAGES=true
export USE_PRECOMPILED_HEADER=true
export ALLOW_DOWNLOADS=true
export SKIP_DEBUG_BUILD=false
export SKIP_FASTDEBUG_BUILD=true
export DEBUG_NAME=debug
unset JAVA_HOME
unset CLASSPATH

　　:wq　　# 写入磁盘

　　source /etc/profile　　# 刷新环境变量配置使之生效，建议echo下几个配置项确认生效，例：echo $LANG

　　cd openjdk7　　# 进入OpenJDK解压目录

　　make sanity　　　# 检查之前的配置是否正确，若无错误（Sanity check passed.）则OK，下面是笔者的执行结果宫参考

[root@dsp-centos--6_9 openjdk7]# make sanity

( cd  ./jdk/make && \

          make sanity HOTSPOT_IMPORT_CHECK=false JDK_TOPDIR=/usr/local/src/openjdk7/jdk JDK_MAKE_SHARED_DIR=/usr/local/src/openjdk7/jdk/make/common/shared EXTERNALSANITYCONTROL=true SOURCE_LANGUAGE_VERSION= TARGET_CLASS_VERSION= MILESTONE=internal BUILD_NUMBER=b00 JDK_BUILD_NUMBER=b00 FULL_VERSION=1.7.-internal-debug-root_2018_05_01_00_10-b00 PREVIOUS_JDK_VERSION=1.6. JDK_VERSION=1.7. JDK_MKTG_VERSION= JDK_MAJOR_VERSION= JDK_MINOR_VERSION= JDK_MICRO_VERSION= PREVIOUS_MAJOR_VERSION= PREVIOUS_MINOR_VERSION= PREVIOUS_MICRO_VERSION= ARCH_DATA_MODEL= VARIANT=DBG DEBUG_CLASSFILES=true COOKED_BUILD_NUMBER= ANT_HOME="/usr/local/apache-ant-1.9.7" ALT_OUTPUTDIR=/usr/local/openjdk7 ALT_LANGTOOLS_DIST=/usr/local/openjdk7/langtools/dist ALT_CORBA_DIST=/usr/local/openjdk7/corba/dist ALT_JAXP_DIST=/usr/local/openjdk7/jaxp/dist ALT_JAXWS_DIST=/usr/local/openjdk7/jaxws/dist ALT_HOTSPOT_IMPORT_PATH=/usr/local/openjdk7/hotspot/import BUILD_HOTSPOT=true ; )

make[]: Entering directory `/usr/local/src/openjdk7/jdk/make'

make[]: Leaving directory `/usr/local/src/openjdk7/jdk/make'

Build Machine Information:

   build machine = dsp-centos--6_9

Build Directory Structure:

   CWD = /usr/local/src/openjdk7

   TOPDIR = .

   LANGTOOLS_TOPDIR = ./langtools

   JAXP_TOPDIR = ./jaxp

   JAXWS_TOPDIR = ./jaxws

   CORBA_TOPDIR = ./corba

   HOTSPOT_TOPDIR = ./hotspot

   JDK_TOPDIR = ./jdk

Build Directives:

   BUILD_LANGTOOLS = true

   BUILD_JAXP = true

   BUILD_JAXWS = true

   BUILD_CORBA = true

   BUILD_HOTSPOT = true

   BUILD_JDK    = true

   DEBUG_CLASSFILES =

   DEBUG_BINARIES =  

Hotspot Settings:

      HOTSPOT_BUILD_JOBS  =

      HOTSPOT_OUTPUTDIR   = /usr/local/openjdk7/hotspot/outputdir

      HOTSPOT_EXPORT_PATH = /usr/local/openjdk7/hotspot/import 

Bootstrap Settings:

  BOOTDIR = /usr/local/jdk1..0_45

    ALT_BOOTDIR = /usr/local/jdk1..0_45

  BOOT_VER = 1.6. [requires at least 1.6]

  OUTPUTDIR = /usr/local/openjdk7

    ALT_OUTPUTDIR = /usr/local/openjdk7

  ABS_OUTPUTDIR = /usr/local/openjdk7

Build Tool Settings:

  SLASH_JAVA = /NOT-SET

    ALT_SLASH_JAVA =

  VARIANT = DBG

  JDK_DEVTOOLS_DIR = /NOT-SET/devtools

    ALT_JDK_DEVTOOLS_DIR =

  ANT_HOME = /usr/local/apache-ant-1.9.

  UNIXCOMMAND_PATH = /bin/

    ALT_UNIXCOMMAND_PATH =

  COMPILER_PATH = /usr/bin/

    ALT_COMPILER_PATH =

  DEVTOOLS_PATH = /usr/bin/

    ALT_DEVTOOLS_PATH =

  UNIXCCS_PATH = /usr/ccs/bin/

    ALT_UNIXCCS_PATH =

  USRBIN_PATH = /usr/bin/

    ALT_USRBIN_PATH =

  COMPILER_NAME = GCC4

  COMPILER_VERSION = GCC4

  CC_VER = 4.4. [requires at least 4.3.]

  ZIP_VER = 3.0 [requires at least 2.2]

  UNZIP_VER = 6.00 [requires at least 5.12]

  ANT_VER = 1.9. [requires at least 1.7.]

  TEMPDIR = /usr/local/openjdk7/tmp

Build Directives:

  OPENJDK = true

  USE_HOTSPOT_INTERPRETER_MODE =

  PEDANTIC =

  DEV_ONLY =

  NO_DOCS =

  NO_IMAGES =

  TOOLS_ONLY =

  INSANE =

  COMPILE_APPROACH = parallel

  PARALLEL_COMPILE_JOBS =

    ALT_PARALLEL_COMPILE_JOBS =

  FASTDEBUG =

  COMPILER_WARNINGS_FATAL = false

  COMPILER_WARNING_LEVEL =

  SHOW_ALL_WARNINGS =

  INCREMENTAL_BUILD = false

  CC_HIGHEST_OPT =

  CC_HIGHER_OPT =

  CC_LOWER_OPT =

  CXXFLAGS =  -g -fPIC -DCC_NOEX -W -Wall  -Wno-unused -Wno-parentheses -fno-omit-frame-pointer -D_LITTLE_ENDIAN

  CFLAGS =  -g   -fno-strict-aliasing -fPIC -W -Wall  -Wno-unused -Wno-parentheses -pipe -fno-omit-frame-pointer -D_LITTLE_ENDIAN

  BOOT_JAVA_CMD = /usr/local/jdk1..0_45/bin/java -XX:-PrintVMOptions -XX:+UnlockDiagnosticVMOptions -XX:-LogVMOutput -Xmx512m -Xms512m -XX:PermSize=32m -XX:MaxPermSize=160m

  BOOT_JAVAC_CMD = /usr/local/jdk1..0_45/bin/javac  -J-XX:ThreadStackSize= -J-XX:-PrintVMOptions -J-XX:+UnlockDiagnosticVMOptions -J-XX:-LogVMOutput -J-Xmx512m -J-Xms512m -J-XX:PermSize=32m -J-XX:MaxPermSize=160m -encoding ascii -source  -target  -XDignore.symbol.file=true

  BOOT_JAR_CMD = /usr/local/jdk1..0_45/bin/jar

  BOOT_JARSIGNER_CMD = /usr/local/jdk1..0_45/bin/jarsigner

  JAVAC_CMD = /usr/local/jdk1..0_45/bin/java -XX:-PrintVMOptions -XX:+UnlockDiagnosticVMOptions -XX:-LogVMOutput -Xmx512m -Xms512m -XX:PermSize=32m -XX:MaxPermSize=160m -Xbootclasspath/p:/usr/local/openjdk7/langtools/dist/bootstrap/lib/javac.jar -jar /usr/local/openjdk7/langtools/dist/bootstrap/lib/javac.jar  -g -source  -target  -encoding ascii -Xbootclasspath:/usr/local/openjdk7/classes

  JAVAH_CMD = /usr/local/jdk1..0_45/bin/java -XX:-PrintVMOptions -XX:+UnlockDiagnosticVMOptions -XX:-LogVMOutput -Xmx512m -Xms512m -XX:PermSize=32m -XX:MaxPermSize=160m -Xbootclasspath/p:/usr/local/openjdk7/langtools/dist/bootstrap/lib/javah.jar:/usr/local/openjdk7/langtools/dist/bootstrap/lib/javac.jar -jar /usr/local/openjdk7/langtools/dist/bootstrap/lib/javah.jar -bootclasspath /usr/local/openjdk7/classes

  JAVADOC_CMD = /usr/local/jdk1..0_45/bin/java -XX:-PrintVMOptions -XX:+UnlockDiagnosticVMOptions -XX:-LogVMOutput -Xmx512m -Xms512m -XX:PermSize=32m -XX:MaxPermSize=160m -Xbootclasspath/p:/usr/local/openjdk7/langtools/dist/bootstrap/lib/javadoc.jar:/usr/local/openjdk7/langtools/dist/bootstrap/lib/javac.jar:/usr/local/openjdk7/langtools/dist/bootstrap/lib/doclets.jar -jar /usr/local/openjdk7/langtools/dist/bootstrap/lib/javadoc.jar -bootclasspath /usr/local/openjdk7/classes

Build Platform Settings:

  USER = root

  PLATFORM = linux

  ARCH = amd64

  LIBARCH = amd64

  ARCH_FAMILY = amd64

  ARCH_DATA_MODEL =

  ARCHPROP = amd64

  ALSA_VERSION = 1.1.

  OS_VERSION = 2.6.-696.16..el6.x86_64 [requires at least 2.6]

  OS_VARIANT_NAME = RedHat

  OS_VARIANT_VERSION =

  MB_OF_MEMORY = 

GNU Make Settings:

  MAKE = make

  MAKE_VER = 3.81 [requires at least 3.81]

  MAKECMDGOALS = sanity

  MAKEFLAGS = w

  SHELL = /bin/sh

Target Build Versions:

  JDK_VERSION = 1.7.

  MILESTONE = internal

  RELEASE = 1.7.-internal-debug

  FULL_VERSION = 1.7.-internal-debug-root_2018_05_01_00_10-b00

  BUILD_NUMBER = b00

External File/Binary Locations:

  USRJDKINSTANCES_PATH = /opt/java

  BUILD_JDK_IMPORT_PATH = /NOT-SET/re/jdk/1.7./promoted/latest/binaries

    ALT_BUILD_JDK_IMPORT_PATH =

  JDK_IMPORT_PATH = /usr/local/jdk1..0_45

    ALT_JDK_IMPORT_PATH = /usr/local/jdk1..0_45

  LANGTOOLS_DIST = /usr/local/openjdk7/langtools/dist

    ALT_LANGTOOLS_DIST = /usr/local/openjdk7/langtools/dist

  CORBA_DIST = /usr/local/openjdk7/corba/dist

    ALT_CORBA_DIST = /usr/local/openjdk7/corba/dist

  JAXP_DIST = /usr/local/openjdk7/jaxp/dist

    ALT_JAXP_DIST = /usr/local/openjdk7/jaxp/dist

  JAXWS_DIST = /usr/local/openjdk7/jaxws/dist

    ALT_JAXWS_DIST = /usr/local/openjdk7/jaxws/dist

  HOTSPOT_DOCS_IMPORT_PATH = /usr/local/openjdk7/hotspot/import/docs

    ALT_HOTSPOT_DOCS_IMPORT_PATH =

  HOTSPOT_IMPORT_PATH = /usr/local/openjdk7/hotspot/import

    ALT_HOTSPOT_IMPORT_PATH = /usr/local/openjdk7/hotspot/import

  HOTSPOT_SERVER_PATH = /usr/local/openjdk7/hotspot/import/jre/lib/amd64/server

    ALT_HOTSPOT_SERVER_PATH =

  CACERTS_FILE = ./../src/share/lib/security/cacerts

    ALT_CACERTS_FILE =

  CUPS_HEADERS_PATH = /usr/include

    ALT_CUPS_HEADERS_PATH = 

OpenJDK-specific settings:

  FREETYPE_HEADERS_PATH = /usr/local/include/freetype2

    ALT_FREETYPE_HEADERS_PATH = /usr/local/include/freetype2

  FREETYPE_LIB_PATH = /usr/local/lib

    ALT_FREETYPE_LIB_PATH = /usr/local/lib

Previous JDK Settings:

  PREVIOUS_RELEASE_PATH = USING-PREVIOUS_RELEASE_IMAGE

    ALT_PREVIOUS_RELEASE_PATH =

  PREVIOUS_JDK_VERSION = 1.6.

    ALT_PREVIOUS_JDK_VERSION =

  PREVIOUS_JDK_FILE =

    ALT_PREVIOUS_JDK_FILE =

  PREVIOUS_JRE_FILE =

    ALT_PREVIOUS_JRE_FILE =

  PREVIOUS_RELEASE_IMAGE = /usr/local/jdk1..0_45

    ALT_PREVIOUS_RELEASE_IMAGE = 

Sanity check passed.

三、编译操作

　　make 2>&1 | tee $ALT_OUTPUTDIR/build.log　　# 编译，标准错误输出stderr重定向到标准输出stdout，将编译过程数据重定向到文件保存。

　　若编译失败，重新编译前先执行：make clean

　　若编译成功，提示信息如下：

-- Build times ----------
Target debug_build
Start 2018-04-30 23:30:30
End 2018-04-30 23:45:05
00:01:45 corba
00:03:32 hotspot
00:00:18 jaxp
00:00:24 jaxws
00:08:05 jdk
00:00:31 langtools
00:14:35 TOTAL
-------------------------

四、验证

　　进入/usr/local/openjdk7/bin（即$ALT_OUTPUTDIR/bin）目录，执行：./java -version

[root@dsp-centos-1-6_9 bin]# ./java -version
openjdk version "1.7.0-internal-debug"
OpenJDK Runtime Environment (build 1.7.0-internal-debug-root_2018_04_30_20_26-b00)
OpenJDK 64-Bit Server VM (build 21.0-b17-jvmg, mixed mode)

　　验证虚拟机

---------------------------------------------------------------------------------

# 将env.sh中的环境变量单独拎出来执行下，笔者直接执行env.sh没效果

# export JAVA_HOME=/usr/local/jdk1..0_45

# export LD_LIBRARY_PATH=.:${JAVA_HOME}/jre/lib/amd64/native_threads:${JAVA_HOME}/jre/lib/amd64:

# export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/jre/lib/i18n.jar

# export HOTSPOT_BUILD_USER="root in hotspot"

[root@dsp-centos--6_9 jvmg]# export JAVA_HOME=/usr/local/jdk1..0_45

[root@dsp-centos--6_9 jvmg]# echo $JAVA_HOME # 确认下是否符合预期

/usr/local/jdk1..0_45

[root@dsp-centos--6_9 jvmg]# export LD_LIBRARY_PATH=.:${JAVA_HOME}/jre/lib/amd64/native_threads:${JAVA_HOME}/jre/lib/amd64:

[root@dsp-centos--6_9 jvmg]# echo $LD_LIBRARY_PATH

.:/usr/local/jdk1..0_45/jre/lib/amd64/native_threads:/usr/local/jdk1..0_45/jre/lib/amd64:

[root@dsp-centos--6_9 jvmg]# export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/jre/lib/i18n.jar

[root@dsp-centos--6_9 jvmg]# echo $CLASSPATH

.:/usr/local/jdk1..0_45/jre/lib/rt.jar:/usr/local/jdk1..0_45/jre/lib/i18n.jar

[root@dsp-centos--6_9 jvmg]# export HOTSPOT_BUILD_USER="root in hotspot"

[root@dsp-centos--6_9 jvmg]# echo $HOTSPOT_BUILD_USER

root in hotspot

---------------------------------------------------------------------------------

[root@dsp-centos--6_9 jvmg]# ./gamma -version

Using java runtime at: /usr/local/jdk1..0_45/jre

java version "1.6.0_45"

Java(TM) SE Runtime Environment (build 1.6.0_45-b06)

OpenJDK -Bit Server VM (build 21.0-b17-jvmg, mixed mode)

---------------------------------------------------------------------------------

[root@dsp-centos--6_9 jvmg]# ./test_gamma 　　# 解八皇后问题

java full version "1.6.0_45-b06"

Using java runtime at: /usr/local/jdk1..0_45/jre

java version "1.6.0_45"

Java(TM) SE Runtime Environment (build 1.6.0_45-b06)

OpenJDK -Bit Server VM (build 21.0-b17-jvmg, mixed mode)

. A1 B5 C8 D6 E3 F7 G2 H4

. A1 B6 C8 D3 E7 F4 G2 H5

. A1 B7 C4 D6 E8 F2 G5 H3

. A1 B7 C5 D8 E2 F4 G6 H3

. A2 B4 C6 D8 E3 F1 G7 H5

. A2 B5 C7 D1 E3 F8 G6 H4

. A2 B5 C7 D4 E1 F8 G6 H3

. A2 B6 C1 D7 E4 F8 G3 H5

. A2 B6 C8 D3 E1 F4 G7 H5

. A2 B7 C3 D6 E8 F5 G1 H4

. A2 B7 C5 D8 E1 F4 G6 H3

. A2 B8 C6 D1 E3 F5 G7 H4

. A3 B1 C7 D5 E8 F2 G4 H6

. A3 B5 C2 D8 E1 F7 G4 H6

. A3 B5 C2 D8 E6 F4 G7 H1

. A3 B5 C7 D1 E4 F2 G8 H6

. A3 B5 C8 D4 E1 F7 G2 H6

. A3 B6 C2 D5 E8 F1 G7 H4

. A3 B6 C2 D7 E1 F4 G8 H5

. A3 B6 C2 D7 E5 F1 G8 H4

. A3 B6 C4 D1 E8 F5 G7 H2

. A3 B6 C4 D2 E8 F5 G7 H1

. A3 B6 C8 D1 E4 F7 G5 H2

. A3 B6 C8 D1 E5 F7 G2 H4

. A3 B6 C8 D2 E4 F1 G7 H5

. A3 B7 C2 D8 E5 F1 G4 H6

. A3 B7 C2 D8 E6 F4 G1 H5

. A3 B8 C4 D7 E1 F6 G2 H5

. A4 B1 C5 D8 E2 F7 G3 H6

. A4 B1 C5 D8 E6 F3 G7 H2

. A4 B2 C5 D8 E6 F1 G3 H7

. A4 B2 C7 D3 E6 F8 G1 H5

. A4 B2 C7 D3 E6 F8 G5 H1

. A4 B2 C7 D5 E1 F8 G6 H3

. A4 B2 C8 D5 E7 F1 G3 H6

. A4 B2 C8 D6 E1 F3 G5 H7

. A4 B6 C1 D5 E2 F8 G3 H7

. A4 B6 C8 D2 E7 F1 G3 H5

. A4 B6 C8 D3 E1 F7 G5 H2

. A4 B7 C1 D8 E5 F2 G6 H3

. A4 B7 C3 D8 E2 F5 G1 H6

. A4 B7 C5 D2 E6 F1 G3 H8

. A4 B7 C5 D3 E1 F6 G8 H2

. A4 B8 C1 D3 E6 F2 G7 H5

. A4 B8 C1 D5 E7 F2 G6 H3

. A4 B8 C5 D3 E1 F7 G2 H6

. A5 B1 C4 D6 E8 F2 G7 H3

. A5 B1 C8 D4 E2 F7 G3 H6

. A5 B1 C8 D6 E3 F7 G2 H4

. A5 B2 C4 D6 E8 F3 G1 H7

. A5 B2 C4 D7 E3 F8 G6 H1

. A5 B2 C6 D1 E7 F4 G8 H3

. A5 B2 C8 D1 E4 F7 G3 H6

. A5 B3 C1 D6 E8 F2 G4 H7

. A5 B3 C1 D7 E2 F8 G6 H4

. A5 B3 C8 D4 E7 F1 G6 H2

. A5 B7 C1 D3 E8 F6 G4 H2

. A5 B7 C1 D4 E2 F8 G6 H3

. A5 B7 C2 D4 E8 F1 G3 H6

. A5 B7 C2 D6 E3 F1 G4 H8

. A5 B7 C2 D6 E3 F1 G8 H4

. A5 B7 C4 D1 E3 F8 G6 H2

. A5 B8 C4 D1 E3 F6 G2 H7

. A5 B8 C4 D1 E7 F2 G6 H3

. A6 B1 C5 D2 E8 F3 G7 H4

. A6 B2 C7 D1 E3 F5 G8 H4

. A6 B2 C7 D1 E4 F8 G5 H3

. A6 B3 C1 D7 E5 F8 G2 H4

. A6 B3 C1 D8 E4 F2 G7 H5

. A6 B3 C1 D8 E5 F2 G4 H7

. A6 B3 C5 D7 E1 F4 G2 H8

. A6 B3 C5 D8 E1 F4 G2 H7

. A6 B3 C7 D2 E4 F8 G1 H5

. A6 B3 C7 D2 E8 F5 G1 H4

. A6 B3 C7 D4 E1 F8 G2 H5

. A6 B4 C1 D5 E8 F2 G7 H3

. A6 B4 C2 D8 E5 F7 G1 H3

. A6 B4 C7 D1 E3 F5 G2 H8

. A6 B4 C7 D1 E8 F2 G5 H3

. A6 B8 C2 D4 E1 F7 G5 H3

. A7 B1 C3 D8 E6 F4 G2 H5

. A7 B2 C4 D1 E8 F5 G3 H6

. A7 B2 C6 D3 E1 F4 G8 H5

. A7 B3 C1 D6 E8 F5 G2 H4

. A7 B3 C8 D2 E5 F1 G6 H4

. A7 B4 C2 D5 E8 F1 G3 H6

. A7 B4 C2 D8 E6 F1 G3 H5

. A7 B5 C3 D1 E6 F8 G2 H4

. A8 B2 C4 D1 E7 F5 G3 H6

. A8 B2 C5 D3 E1 F7 G4 H6

. A8 B3 C1 D6 E2 F5 G7 H4

. A8 B4 C1 D3 E6 F2 G7 H5

[root@dsp-centos--6_9 jvmg]#

五、笔者碰到的问题

　　1、java.lang.RuntimeException: time is more than 10 years from present

　　　　修改jdk/src/share/classes/java/util/CurrencyData.properties，将日期改为十年以内，JDK的Bug。

　　108行改为： AZ=AZM;2009-12-31-20-00-00;AZN，接下来的377、439、529、555行类似修改保存，重新编译。

2、/usr/local/openjdk7-debug/jaxws/build/xml_generated/build-drop-jaf_src.xml:96: Redirection detected from https to http. Protocol switch unsafe, not allowed.

　　原因是jdk7-jaf-2010_08_19.zip这个包下载不了导致的，解决方案：

将以下三个文件下载后置于OpenJDK解压后根目录下的drop目录下，

并在环境变量中加入配置：export ALT_DROPS_DIR=/usr/local/src/openjdk7/drop # 注意目录Path

jdk7-jaf-2010_08_19.zip，下载地址：https://netix.dl.sourceforge.net/project/jdk7src/input-archives/jdk7-jaf-2010_08_19.zip

jdk7-jaxws2_2_4-b03-2011_05_27.zip，下载地址：http://download.java.net/glassfish/components/jax-ws/openjdk/jdk7/jdk7-jaxws2_2_4-b03-2011_05_27.zip

jaxp145_01.zip，下载地址：http://download.java.net/jaxp/1.4.5/jaxp145_01.zip

以下是操作过程的命令：

mkdir /usr/local/src/openjdk7/drop
export ALT_DROPS_DIR=/usr/local/src/openjdk7/drop
cd /usr/local/src/openjdk7/drop
wget http://download.java.net/jaxp/1.4.5/jaxp145_01.zip
wget https://netix.dl.sourceforge.net/project/jdk7src/input-archives/jdk7-jaf-2010_08_19.zip
wget http://download.java.net/glassfish/components/jax-ws/openjdk/jdk7/jdk7-jaxws2_2_4-b03-2011_05_27.zip

六、参考资料：

　　《深入理解Java虚拟机：JVM高级特性与最佳实践》

　　[深入理解Java虚拟机]第一章实战 自己编译JDK

　　ubuntu13 编译openjdk7的问题并解决

　　java-编译openJdk

　　openjdk7 源码下载

JDK源码下载

OpenJDK8 Windows编译

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