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