解决Cannot change version of project facet Dynamic web module to 3.0

我们用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，而一般现在至少都是2.5，在Project Facets里面修改Dynamic web module为2.5的时候就会出现Cannot change version of project facet Dynamic web module to 3.0

 

其实在右边可以看到改到2.5需要的条件以及有冲突的facets，解决这个问题的步骤如下：

1.把Servlet改成2.5，打开项目的web.xml，改之前：

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app>  <display-name>Archetype Created Web Application</display-name></web-app>

改后：

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"    xmlns="http://java.sun.com/xml/ns/javaee"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">      <display-name>Archetype Created Web Application</display-name></web-app>

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

eclipse.preferences.version=1org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabledorg.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5org.eclipse.jdt.core.compiler.compliance=1.5org.eclipse.jdt.core.compiler.problem.assertIdentifier=errororg.eclipse.jdt.core.compiler.problem.enumIdentifier=errororg.eclipse.jdt.core.compiler.problem.forbiddenReference=warningorg.eclipse.jdt.core.compiler.source=1.5

把1.5改成1.6

eclipse.preferences.version=1org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabledorg.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6org.eclipse.jdt.core.compiler.compliance=1.6org.eclipse.jdt.core.compiler.problem.assertIdentifier=errororg.eclipse.jdt.core.compiler.problem.enumIdentifier=errororg.eclipse.jdt.core.compiler.problem.forbiddenReference=warningorg.eclipse.jdt.core.compiler.source=1.6

打开org.eclipse.wst.common.component

<?xml version="1.0" encoding="UTF-8"?><project-modules id="moduleCoreId" project-version="1.5.0">    <wb-module deploy-name="test">        <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"/>        <property name="context-root" value="test"/>        <property name="java-output-path" value="/test/target/classes"/>    </wb-module></project-modules>

把project-version="1.5.0"改成project-version="1.6.0"

 

<?xml version="1.0" encoding="UTF-8"?><project-modules id="moduleCoreId" project-version="1.6.0">    <wb-module deploy-name="test">        <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"/>        <property name="context-root" value="test"/>        <property name="java-output-path" value="/test/target/classes"/>    </wb-module></project-modules>

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

<?xml version="1.0" encoding="UTF-8"?><faceted-project>  <fixed facet="wst.jsdt.web"/>  <installed facet="java" version="1.5"/>  <installed facet="jst.web" version="2.3"/>  <installed facet="wst.jsdt.web" version="1.0"/></faceted-project>

把<installed facet="java" version="1.5"/>改成<installed facet="java" version="1.6"/>，把  <installed facet="jst.web" version="2.3"/>改成  <installed facet="jst.web" version="2.5"/>

<?xml version="1.0" encoding="UTF-8"?><faceted-project>  <fixed facet="wst.jsdt.web"/>  <installed facet="java" version="1.6"/>  <installed facet="jst.web" version="2.5"/>  <installed facet="wst.jsdt.web" version="1.0"/></faceted-project>

都改好之后在打开看看，已经把Dynamic web module改成了3.0