Jetty9 NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet

第一次使用Jetty9时，出现的问题

第一次使用Jetty9时，出现的问题当现在好Jetty9后（可以在官方网站上下载，当前的最新版为Revision 9.1.0-SNAPSHOT），之后解压到本地，不用配置，看解压后目录文件：

在jetty的根目录也就是${JETTY_HOME},打开cmd，或打开cmd后，切换到${JETTY_HOME}下，
>java -jar start.jar

这样就可以启动Jetty服务器了，但是，你在页面中是访问不到的，比如输入http://localhost:8080，是得不到任何的返回结果的，为什么呢?请看下面的摘录：

You can point a browser at this server athttp://localhost:8080.Since release 9.1.0, the jetty distribution does not deploy any demo web applications, so to see a more interesting demonstration of the server you need to run from the demo-base directory as follows:

意思是说：从9.1.0版本开始，不是默认的部署示例应用，需要自己去启动

> cd $JETTY_HOME/demo-base/
> java -jar ../start.jar

将路径切换到demo-base目录下：

D:\JAVA\jetty-distribution-9.1.0.v20131115>cd demo-base

这样的话你就可以在浏览器中看到示例页面了。

再看看官网的介绍：

Creating a new Jetty Base

The demo-base directory described above is an example of the jetty.base mechanism added in Jetty 9.1. A jetty base allows the configuration and web applications of a server instance to be stored separately from the jetty distribution, so that upgrades can be done with minimal disruption. Jetty's default configuration is based on two properties:

jetty.homeThe property that defines the location of the jetty distribution, its libs, default modules and default XML files (typically start.jar, lib, etc)

jetty.baseThe property that defines the location of a specific instance of a jetty server, its configuration, logs and web applications(typically start.ini, start.d, logs and webapps)

这说明要部署应用，都需要自己的BASE，从上面部署demo时就可以看出来。

但是，问题出来了：

当我新建好mybase文件夹后，将以前做好的web app放到该目录的webapps后，在启动etty时，出现以下问题：

2013-11-27 12:05:22.981:INFO:oejw.StandardDescriptorProcessor:main: NO JSP Suppo
rt for /, did not find org.apache.jasper.servlet.JspServlet
2013-11-27 12:05:23.012:INFO:oejsh.ContextHandler:main: Started o.e.j.w.WebAppCo
ntext@1c86116{/,file:/D:/JAVA/jetty-distribution-9.1.0.v20131115/mybase/webapps/
ROOT/,AVAILABLE}{D:\JAVA\jetty-distribution-9.1.0.v20131115\mybase\webapps\ROOT}

2013-11-27 12:05:23.075:INFO:oejw.StandardDescriptorProcessor:main: NO JSP Suppo
rt for /MMS1.0, did not find org.apache.jasper.servlet.JspServlet

就是那个NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet，

经过查询，说明文档说的是JSP需要编译，单是Jetty不会默认的保存，编译需要JDK，如果System中也就是系统没有装JDK的话，需要在配置文当中开启使用自己的编译器，但是我有啊，java、javac都能使用，再查说是要加参数：

java -jar jetty.jar OPTIONS=Server,jsp

但是用了，还是没用，最后擦看文档，有个命令可以查看环境：

D:\JAVA\jetty-distribution-9.1.0.v20131115\mybase>java -jar ../start.jar --version

Jetty Server Classpath:
-----------------------
Version Information on 11 entries in the classpath.
Note: order presented here is how they would appear on the classpath.
      changes to the --module=name command line options will be reflected here.
0:                    3.1.0 | ${jetty.home}\lib\servlet-api-3.1.jar
1:                  3.1.RC0 | ${jetty.home}\lib\jetty-schemas-3.1.jar
2:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-http-9.1.0.v20131115.jar
3:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-server-9.1.0.v20131115.jar
4:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-xml-9.1.0.v20131115.jar
5:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-util-9.1.0.v20131115.jar
6:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-io-9.1.0.v20131115.jar
7:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-security-9.1.0.v20131115.jar
8:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-servlet-9.1.0.v20131115.jar
9:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-webapp-9.1.0.v20131115.jar
10:          9.1.0.v20131115 | ${jetty.home}\lib\jetty-deploy-9.1.0.v20131115.jar

我一看，是不是少了编译JSP的jar，试着添加：

D:\JAVA\jetty-distribution-9.1.0.v20131115\mybase>java -jar ../start.jar --add-to-start=jsp

WARNING: jsp             initialised in ${jetty.base}\start.ini (appended)
WARNING: jsp             enabled in     ${jetty.base}\start.ini
WARNING: server          enabled in     ${jetty.base}\start.ini

这一看，添加过了，我才记起，刚才在start.ini中打开了一(ˇˍˇ）想项配置：

--Dorg.apache.jasper.compiler.disablejsr199=true

这块原先是被注释掉的，可以打开，然后再base目录下的start.ini中出现了一行：

#
# Initialize module jsp
#
--module=jsp

# JSP Configuration
# To use an non-jdk compiler for JSP compilation uncomment next line
# -Dorg.apache.jasper.compiler.disablejsr199=true

我记得原先好像没有出现，现在有了，在他的下面也有那个开启jsp编译的选项，但是被注释点了，不知道是咋弄好的，这时候，可以正常启动了。打开浏览器可以正常访问了。

。。。。。。。

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Jetty9 NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet

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