Cannot change version of project facet Dynamic web

目录[-]

• 问题描述
• 解决这个问题的步骤如下：
• 1.把Servlet改成3.0，打开项目的web.xml
• 2.修改项目的设置，在Navigator下打开项目.settings目录下的org.eclipse.jdt.core.prefs
• 3. 打开org.eclipse.wst.common.component 
• 4. 打开org.eclipse.wst.common.project.facet.core.xml  
• 最后的效果如图：

问题描述

        用Eclipse创建Maven结构的web项目的时候选择了Artifact Id为maven-artchetype-webapp，由于这个catalog比较老，用的servlet还是2.3的，而一般现在都是用3.0，在Project Facets里面修改Dynamic web module为3.0的时候就会出现Cannot change version of project facet Dynamic web module to 3.0，如图：

其实在右边可以看到改到3.0需要的条件以及有冲突的facets，4

解决这个问题的步骤如下：

1.把Servlet改成3.0，打开项目的web.xml

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<? xml  version = "1.0"  encoding = "UTF-8" ?>
< web-app  xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
    xmlns = "http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id = "schedule-console"  version = "3.0" >

2.修改项目的设置，在Navigator下打开项目.settings目录下的org.eclipse.jdt.core.prefs

把1.5改成1.7

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eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
org.eclipse.jdt.core.compiler.compliance=1.7
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
org.eclipse.jdt.core.compiler.source=1.7

3. 打开org.eclipse.wst.common.component 

本文件不用修改

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<? xml  version = "1.0"  encoding = "UTF-8" ?>< project-modules  id = "moduleCoreId"  project-version = "1.5.0" >
    < wb-module  deploy-name = "xband-schedule-console" >
        < wb-resource  deploy-path = "/"  source-path = "/target/m2e-wtp/web-resources" />
        < wb-resource  deploy-path = "/"  source-path = "/src/main/webapp"  tag = "defaultRootSource" />
        < wb-resource  deploy-path = "/WEB-INF/classes"  source-path = "/src/main/java" />
        < wb-resource  deploy-path = "/WEB-INF/classes"  source-path = "/src/main/resources" />
        < dependent-module  archiveName = "xband-schedule-core-1.0-SNAPSHOT.jar"  deploy-path = "/WEB-INF/lib"  handle = "module:/resource/xband-schedule-core/xband-schedule-core" >
            < dependency-type >uses</ dependency-type >
        </ dependent-module >
        < property  name = "java-output-path"  value = "/xband-schedule-console/target/classes" />
        < property  name = "context-root"  value = "schedule-console" />
    </ wb-module >
</ project-modules >

4. 打开org.eclipse.wst.common.project.facet.core.xml  

把1.5改成1.7

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<? xml  version = "1.0"  encoding = "UTF-8" ?>
< faceted-project >
  < fixed  facet = "wst.jsdt.web" />
  < installed  facet = "jst.web"  version = "3.0" />
  < installed  facet = "wst.jsdt.web"  version = "1.0" />
  < installed  facet = "java"  version = "1.7" />
</ faceted-project >

最后的效果如图：