From jetty-start-8.1.0.RC5-sources\org\eclipse\jetty\start\start.config
# This file controls what file are to be put on classpath or command line.
#
# Format is as follows:
#
# Each line contains entry in the format:
#
# SUBJECT [ [!] CONDITION [AND|OR] ]*
#
# where SUBJECT:
# ends with ".class" is the Main class to run.
# ends with ".xml" is a configuration file for the command line
# ends with "/" is a directory from which to add all jar and zip files.
# ends with "/*" is a directory from which to add all unconsidered jar and zip files.
# ends with "/**" is a directory from which to recursively add all unconsidered jar and zip files.
# Containing = are used to assign system properties.
# Containing ~= are used to assign start properties.
# Containing /= are used to assign a canonical path.
# all other subjects are treated as files to be added to the classpath.
#
# ${name} is expanded to a start property
# $(name) is expanded to either a start property or a system property.
# The start property ${version} is defined as the version of the start.jar
#
# Files starting with "/" are considered absolute, all others are relative to
# the home directory.
#
# CONDITION is one of:
# always
# never
# available classname # true if class on classpath
# property name # true if set as start property
# system name # true if set as system property
# exists file # true if file/dir exists
# java OPERATOR version # java version compared to literal
# nargs OPERATOR number # number of command line args compared to literal
# OPERATOR := one of "<",">","<=",">=","==","!="
#
# CONTITIONS can be combined with AND OR or !, with AND being the assume
# operator for a list of CONDITIONS.
#
# Classpath operations are evaluated on the fly, so once a class or jar is
# added to the classpath, subsequent available conditions will see that class.
#
# The configuration file may be divided into sections with option names like:
# [ssl,default]
#
# Clauses after a section header will only be included if they match one of the tags in the
# options property. By default options are set to "default,*" or the OPTIONS property may
# be used to pass in a list of tags, eg. :
#
# java -jar start.jar OPTIONS=jetty,jsp,ssl
#
# The tag '*' is always appended to the options, so any section with the * tag is always
# applied.
#
# add a property defined classpath
${path}.path property path
# 把在java -jar start.jar这个执行命令定义的path变量的值加入到classpath中去
# 譬如运行 java -jar start.jar -Dpath=..\mylib
# ..\mylib是会被加入到classpath中去的
# 那么为什么是${path}.path，而不是简单的${path}？
# 首先，写成${path}.path，是因为jetty会做相应的解析
# if (subject.toLowerCase().endsWith(".path"))
# {
# // classpath (jetty.class.path?) to add to runtime classpath
# String cn = expand(subject.substring(0,subject.length() - 5));
# if (cn != null && cn.length() > 0)
# {
# debug(" PATH=" + cn);
# addClasspathPath(options,cn);
# }
# continue;
# }
# 输出是这样的：
# T ${path}.path property path
# PATH=..\mylib
# 其实，如果写出${path}，效果是一样的，只不过处理起来稍有不同
# T ${path} property path
# CLASSPATH+=K:\dev\mylib
# add a property defined library directory
${lib}/** exists ${lib}
# 命令行如果设置了lib参数，就把lib下面所有的jar和zip加入到classpath
# 默认的是不设的
#==================================================
# jetty.home 的设置
#==================================================
# Try different settings of jetty.home until the start.jar is found.
jetty.home=. ! exists $(jetty.home)/start.jar
jetty.home=.. ! exists $(jetty.home)/start.jar
jetty.home=jetty-distribution/src/main/resources ! exists $(jetty.home)/start.jar
jetty.home=../jetty-distribution/src/main/resources ! exists $(jetty.home)/start.jar
jetty.home=. ! exists $(jetty.home)/start.jar
jetty.home/=$(jetty.home) exists $(jetty.home)/start.jar
# 上面这段是关于jetty.home的查找
# 默认情况下，jetty.home先设置为当前目录，也就是运行java -jar start.jar的目录：
_jettyHome = System.getProperty("jetty.home",".");
先是判断这个文件的存在$(jetty.home)/start.jar
如果不存在，$(jetty.home)会被设置到当前目录
T jetty.home=. ! exists $(jetty.home)/start.jar
jetty.home=.
如果$(jetty.home)还没找到，就把$(jetty.home)设置到父目录
F jetty.home=.. ! exists $(jetty.home)/start.jar
设置到jetty-distribution/src/main/resources
F jetty.home=jetty-distribution/src/main/resources ! exists $(jetty.home)/start.jar
设置到../jetty-distribution/src/main/resources
F jetty.home=../jetty-distribution/src/main/resources ! exists $(jetty.home)/start.jar
设置回当前目录
F jetty.home=. ! exists $(jetty.home)/start.jar
然后设置$(jetty.home)。在本例中，第一次判断之后，jetty.home就一直设置正确了
T jetty.home/=$(jetty.home) exists $(jetty.home)/start.jar
jetty.home/=.==K:\dev\jetty-hightide-8.1.0.RC5
# jetty.home也可以通过命令行指定，譬如：
java -jar D:\dev\jetty-distribution-8.1.0.RC5\start.jar -Djetty.home=D:\dev\jetty-distribution-8.1.0.RC5\bin DEBUG=true --dry-run
#================================================================
# The main class to run
org.eclipse.jetty.xml.XmlConfiguration.class
${start.class}.class property start.class
你可以让start.jar运行你自己的类，譬如：
T org.eclipse.jetty.xml.XmlConfiguration.class
CLASS=org.eclipse.jetty.xml.XmlConfiguration
T ${start.class}.class property start.class
CLASS=test.Hello
java -jar D:\dev\jetty-distribution-8.1.0.RC5\start.jar -Djetty.home=D:\dev\jetty-distribution-8.1.0.RC5\ DEBUG=true -Dstart.class=test.Hello
输出：
WARNING: System properties and/or JVM args set. Consider using --dry-run or --exec
main.class=test.Hello
test.Hello null
Hello!
D:\dev>
# The default configuration files
$(jetty.home)/etc/jetty.xml nargs == 0
./jetty-server/src/main/config/etc/jetty.xml nargs == 0 AND ! exists $(jetty.home)/etc/jetty.xml
# Default OPTIONS if not specified on the command line
OPTIONS~=default,* ! property OPTIONS
# Add a resources directory if it is there
[All,resources,default]
$(jetty.home)/resources/
# Add jetty modules
[*]
$(jetty.home)/lib/jetty-util-$(version).jar ! available org.eclipse.jetty.util.StringUtil
$(jetty.home)/lib/jetty-io-$(version).jar ! available org.eclipse.jetty.io.Buffer
[Server,All,xml,default]
$(jetty.home)/lib/jetty-xml-$(version).jar ! available org.eclipse.jetty.xml.XmlParser
[Server,All,server,default]
$(jetty.home)/lib/servlet-api-3.0.jar ! available javax.servlet.ServletContext
$(jetty.home)/lib/jetty-http-$(version).jar ! available org.eclipse.jetty.http.HttpParser
$(jetty.home)/lib/jetty-continuation-$(version).jar ! available org.eclipse.jetty.continuation.Continuation
$(jetty.home)/lib/jetty-server-$(version).jar ! available org.eclipse.jetty.server.Server
[Server,All,security,default]
$(jetty.home)/lib/jetty-security-$(version).jar ! available org.eclipse.jetty.security.LoginService
[Server,All,servlet,default]
$(jetty.home)/lib/servlet-api-3.0.jar ! available javax.servlet.ServletContext
$(jetty.home)/lib/jetty-servlet-$(version).jar ! available org.eclipse.jetty.servlet.ServletHandler
[Server,All,webapp,default]
$(jetty.home)/lib/jetty-webapp-$(version).jar ! available org.eclipse.jetty.webapp.WebAppContext
[Server,All,deploy,default]
$(jetty.home)/lib/jetty-deploy-$(version).jar ! available org.eclipse.jetty.deploy.ContextDeployer
[Server,All,servlets,default]
$(jetty.home)/lib/jetty-servlets-$(version).jar ! available org.eclipse.jetty.servlets.WelcomeFilter
[All,rewrite]
$(jetty.home)/lib/jetty-rewrite-$(version).jar ! available org.eclipse.jetty.rewrite.handler.RewriteHandler
[All,jmx]
$(jetty.home)/lib/jetty-jmx-$(version).jar ! available org.eclipse.jetty.jmx.MBeanContainer
[All,ajp]
$(jetty.home)/lib/jetty-ajp-$(version).jar ! available org.eclipse.jetty.ajp.Ajp13Connection
[All,plus,jndi]
$(jetty.home)/lib/jetty-jndi-${version}.jar ! available org.eclipse.jetty.jndi.ContextFactory
$(jetty.home)/lib/jetty-plus-${version}.jar ! available org.eclipse.jetty.plus.jndi.NamingEntry
$(jetty.home)/lib/jndi/** exists $(jetty.home)/lib/jndi
[All,annotations]
$(jetty.home)/lib/jetty-annotations-$(version).jar ! available org.eclipse.jetty.annotations.AnnotationFinder
$(jetty.home)/lib/annotations/** exists $(jetty.home)/lib/jndi
[All,setuid]
$(jetty.home)/lib/jetty-setuid-$(version).jar ! available org.eclipse.jetty.setuid.SetUID
$(jetty.home)/lib/setuid/**
[All,policy]
$(jetty.home)/lib/jetty-policy-$(version).jar ! available org.eclipse.jetty.policy.JettyPolicy
[All,Client,client]
$(jetty.home)/lib/jetty-http-$(version).jar ! available org.eclipse.jetty.http.HttpParser
$(jetty.home)/lib/jetty-client-$(version).jar ! available org.eclipse.jetty.client.HttpClient
[All,websocket]
$(jetty.home)/lib/jetty-websocket-$(version).jar ! available org.eclipse.jetty.websocket.WebSocket
[Client]
$(jetty.home)/lib/jetty-http-$(version).jar ! available org.eclipse.jetty.http.HttpParser
[All,websocket]
$(jetty.home)/lib/jetty-websocket-$(version).jar ! available org.eclipse.jetty.websocket.WebSocket
[All,overlay,overlays]
$(jetty.home)/lib/jetty-overlay-deployer-$(version).jar ! available org.eclipse.jetty.overlay.OverlayedAppProvider
# Add ext if it exists
[Server,All,default,ext]
$(jetty.home)/lib/ext/**
# Add all other sub-directories in /lib/ as options in a dynamic way
[All,=$(jetty.home)/lib/**]