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Cannot change version of project facet Dynamic web

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

<?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

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

<?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="http://www.mamicode.com/xband-schedule-console/target/classes"/>
        <property name="context-root" value="http://www.mamicode.com/schedule-console"/>
    </wb-module>
</project-modules>

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

把1.5改成1.7

<?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:技术分享

Cannot change version of project facet Dynamic web