在学习使用Hudson进行持续集成时，总是报这样的错误：
can't open C:\Program Files\Java\jdk1.5.0\lib\tzmappings.
Started by user anonymous
Updating svn://127.0.0.1/test/quickstart/trunk
At revision 886
no change for svn://127.0.0.1/test/quickstart/trunk since the previous build
Parsing POMs
[trunk] $ java -cp "C:\Documents and Settings\QGD\.hudson\plugins\maven-plugin\WEB-INF\lib\maven-agent-1.372.jar;E:\Program Files\Apache Software Foundation\apache-maven-2.2.1\boot\classworlds-1.1.jar" hudson.maven.agent.Main "E:\Program Files\Apache Software Foundation\apache-maven-2.2.1" "C:\Documents and Settings\QGD\.hudson\war\WEB-INF\lib\remoting-1.372.jar" "C:\Documents and Settings\QGD\.hudson\plugins\maven-plugin\WEB-INF\lib\maven-interceptor-1.372.jar" 1198 "C:\Documents and Settings\QGD\.hudson\plugins\maven-plugin\WEB-INF\lib\maven2.1-interceptor-1.2.jar"
<===[HUDSON REMOTING CAPACITY]===>���channel started
Executing Maven: -B -f C:\Documents and Settings\QGD\.hudson\jobs\A test project\workspace\trunk\pom.xml clean test
ZoneInfo: C:\Program Files\Java\jdk1.5.0\lib\zi\ZoneInfoMappings (系统找不到指定的路径。)
ZoneInfo: C:\Program Files\Java\jdk1.5.0\lib\zi\ZoneInfoMappings (系统找不到指定的路径。)
ZoneInfo: C:\Program Files\Java\jdk1.5.0\lib\zi\ZoneInfoMappings (系统找不到指定的路径。)
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building quickstart
[INFO] task-segment: [clean, test]
[INFO] ------------------------------------------------------------------------
[INFO] [clean:clean {execution: default-clean}]
[INFO] Deleting directory C:\Documents and Settings\QGD\.hudson\jobs\A test project\workspace\trunk\target
[INFO] [resources:resources {execution: default-resources}]
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] [compiler:compile {execution: default-compile}]
[INFO] Compiling 1 source file to C:\Documents and Settings\QGD\.hudson\jobs\A test project\workspace\trunk\target\classes
[HUDSON] Archiving C:\Documents and Settings\QGD\.hudson\jobs\A test project\workspace\trunk\pom.xml to C:\Documents and Settings\QGD\.hudson\jobs\A test project\modules\cn.ac.ceode.xtwh$quickstart\builds\2010-08-18_19-56-56\archive\cn.ac.ceode.xtwh\quickstart\0.0.1-SNAPSHOT\pom.xml
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
Unable to locate the Javac Compiler in:
C:\Program Files\Java\jdk1.5.0\..\lib\tools.jar
Please ensure you are using JDK 1.4 or above and
not a JRE (the com.sun.tools.javac.Main class is required).
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable.
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2 seconds
[INFO] Finished at: Wed Aug 18 11:57:02 GMT 2010
[INFO] Final Memory: 8M/14M
[INFO] ------------------------------------------------------------------------
channel stopped
can't open C:\Program Files\Java\jdk1.5.0\lib\tzmappings.
Finished: FAILURE
尽管我设定了JAVA_HOME变量的值，但是每次Hudson显示的系统只java.home 都是 C:\Program Files\Java\jre6\
不得已在Hudson的 Global properties -> Environment variables 种手动添加了java.home 为 C:\Program Files\Java\jdk1.6.0_13。但是类似的错误仍在继续。
正在一筹莫展时，发现Maven的java home 也不是JAVA_HOME的，而是其下的jre文件夹： Java home: C:\Program Files\Java\jdk1.6.0_13\jre
照这个值将Hudson的 java.home改为 C:\Program Files\Java\jdk1.6.0_13\jre，即可
上网查了一下，没找到他们之间的详细区别，以后再碰到时再探究原因吧