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

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 2.5，如图：



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：

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<!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：

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<?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

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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

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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

打开org.eclipse.wst.common.component

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<?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"

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<?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

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<?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"/>

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<?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2.5



好了，大功搞成，这是一种解决办法，但是治标不治本，更高级的就是自定义catalog，然后安装到本地，再创建的时候啥都有了，比如把现在流行的s(struts2)sh，ssi，s(springmvc)sh 创建catalog，包括包结构，部分代码啥的都有，下次写吧。