解决Cannot change version of project facet Dynamic w

摘要: 解决Cannot change version of project facet Dynamic web module to 2.5

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 2.5



解决步骤如下：

1. 修改web.xml

修改前如下：

<!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>

修改后如下

<?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



修改前如下：

eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5
org.eclipse.jdt.core.compiler.compliance=1.5
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=1.5

把1.5改成1.6，修改后如下

eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
org.eclipse.jdt.core.compiler.compliance=1.6
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=1.6

还是以上目录，修改org.eclipse.wst.common.component

修改前如下

<?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"，修改后如下

<?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>

还是以上目录，修改org.eclipse.wst.common.project.facet.core.xml

修改前如下

<?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>

修改后如下

<?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>

修改后成后再打开，已经把Dynamic web module改成了2.5，如图