解决Cannot change version of project facet Dynamic

咱们用Eclipse建立Maven结构的web项目的时候选择了Artifact Id为maven-artchetype-webapp，因为这个catalog比较老，用的servlet仍是2.3的，而通常如今至少都是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：

其实在右边能够看到改到2.5须要的条件以及有冲突的facets，解决这个问题的步骤以下：

1.把Servlet改为2.5，打开项目的web.xml，改以前：

 

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1. <!DOCTYPE web-app PUBLIC  
2.  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"  
3.  "http://java.sun.com/dtd/web-app_2_3.dtd" >  
4.   
5. <web-app>  
6.   <display-name>Archetype Created Web Application</display-name>  
7. </web-app>  

<!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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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <web-app version="2.5"  
3.     xmlns="http://java.sun.com/xml/ns/javaee"  
4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
5.     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  
6.     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  
7.       
8.   <display-name>Archetype Created Web Application</display-name>  
9. </web-app>  

<?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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1. eclipse.preferences.version=1  
2. org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled  
3. org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5  
4. org.eclipse.jdt.core.compiler.compliance=1.5  
5. org.eclipse.jdt.core.compiler.problem.assertIdentifier=error  
6. org.eclipse.jdt.core.compiler.problem.enumIdentifier=error  
7. org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning  
8. org.eclipse.jdt.core.compiler.source=1.5  

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改为1.6

 

 

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1. eclipse.preferences.version=1  
2. org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled  
3. org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6  
4. org.eclipse.jdt.core.compiler.compliance=1.6  
5. org.eclipse.jdt.core.compiler.problem.assertIdentifier=error  
6. org.eclipse.jdt.core.compiler.problem.enumIdentifier=error  
7. org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning  
8. org.eclipse.jdt.core.compiler.source=1.6  

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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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <project-modules id="moduleCoreId" project-version="1.5.0">  
3.     <wb-module deploy-name="test">  
4.         <wb-resource deploy-path="/" source-path="/target/m2e-wtp/web-resources"/>  
5.         <wb-resource deploy-path="/" source-path="/src/main/webapp" tag="defaultRootSource"/>  
6.         <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/java"/>  
7.         <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/resources"/>  
8.         <property name="context-root" value="test"/>  
9.         <property name="java-output-path" value="/test/target/classes"/>  
10.     </wb-module>  
11. </project-modules>  

<?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"改为project-version="1.6.0"
 

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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <project-modules id="moduleCoreId" project-version="1.6.0">  
3.     <wb-module deploy-name="test">  
4.         <wb-resource deploy-path="/" source-path="/target/m2e-wtp/web-resources"/>  
5.         <wb-resource deploy-path="/" source-path="/src/main/webapp" tag="defaultRootSource"/>  
6.         <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/java"/>  
7.         <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/resources"/>  
8.         <property name="context-root" value="test"/>  
9.         <property name="java-output-path" value="/test/target/classes"/>  
10.     </wb-module>  
11. </project-modules>  

<?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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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <faceted-project>  
3.   <fixed facet="wst.jsdt.web"/>  
4.   <installed facet="java" version="1.5"/>  
5.   <installed facet="jst.web" version="2.3"/>  
6.   <installed facet="wst.jsdt.web" version="1.0"/>  
7. </faceted-project>  

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

 

 

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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <faceted-project>  
3.   <fixed facet="wst.jsdt.web"/>  
4.   <installed facet="java" version="1.6"/>  
5.   <installed facet="jst.web" version="2.5"/>  
6.   <installed facet="wst.jsdt.web" version="1.0"/>  
7. </faceted-project>  

<?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>

都改好以后在打开看看，已经把Dynamic web module改为了2.5

 

好了，大功搞成，这是一种解决办法，可是治标不治本，更高级的就是自定义catalog，而后安装到本地，再建立的时候啥都有了，好比把如今流行的s(struts2)sh，ssi，s(springmvc)sh 建立catalog，包括包结构，部分代码啥的都有，下次写吧。