本文将带你了解WEBAPP开发maven-jetty-plugin保存文件报错：请求的操作无法在使用用户映射区域打开的文件上执行，希望本文对大家学WEBAPP有所帮助。

使用jetty-maven-plugin   在eclipse中进行运行调试,碰到无法编辑保存webapp下的文件

提示:请求的操作无法在使用用户映射区域打开的文件上执行

解决方法:

从   jetty 7   开始,jar存放在maven仓库中的路径为org/eclise/jetty/jetty-webapp

打开对应的版本的jar包
修改jar中的org/mortbay/jetty/webapp/webdefault.xml文件

Java代码

  useFileMappedBuffer       

  true        

改好后放回jar包

另一种办法是将webdefault.xml   提取出来,修改后放在给定位置,然后配置jetty插件的信息

Java代码

    src/test/resources/webdefault.xml    

对于jetty9之后的版本可以这样改：

把webdefault.xml文件复制到src/main/resources/目录下，修改useFileMappedBuffer的值为false。然后修改pom.xml如下：

                org.eclipse.jetty

                jetty-maven-plugin

                9.2.12.M0

                        src/main/resources/webdefault.xml

                    /

                    2

参考：

Configuring Your WebApp

These   configuration parameters apply to your webapp. They are common to almost all   goals.

webApp

Represents   an extension to the class org.eclipse.jetty.webapp.WebAppContext.   You can use any of the setter methods on this object to configure your   webapp. Here are a few of the most useful ones:

contextPath

The context path for your webapp. By default, this is set   to /.

descriptor

The path to the web.xml file for   your webapp.

defaultsDescriptor

The path to a webdefault.xml file   that will be applied to your webapp before the web.xml. If you don‘t supply one, Jetty uses a   default file baked into the jetty-webapp.jar.

overrideDescriptor

The path to a web.xml file that   Jetty applies after reading your web.xml. You can use this   to replace or add configuration.

tempDirectory

The path to a dir that Jetty can use to expand or copy jars and   jsp compiles when your webapp is running. The default is${project.build.outputDirectory}/tmp.

baseResource

The path from which Jetty serves static resources. Defaults   to src/main/webapp.

resourceBases

Use instead of baseResource if   you have multiple dirs from which you want to serve static content. This is   an array of dir names.

baseAppFirst

Defaults to "true". Controls whether any overlaid   wars are added before or after the original base resource(s) of the webapp.   See the section on overlaid wars for more   information.

contextXml

The   path to a context xml file that is applied to your webapp AFTER   the webApp element.

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