使用Maven遇到的问题，完美解决

1、导入Maven项目出错 org.apache.maven:maven-archiver:pom:2.5…
这个问题是我再将Maven项目从笔记本拷到台式机的时候出现的问题，原因是连不上http://repo1.maven.org/maven2这个仓库，在pom.xml文件加入如下配置

    1. <repositories>  
    2.     <repository>  
    3.       <snapshots>  
    4.         <enabled>false</enabled>  
    5.       </snapshots>  
    6.       <id>central</id>  
    7.       <name>Maven Repository Switchboard</name>  
    8.       <url>http://repo2.maven.org/maven2</url>  
    9.     </repository>  
    10.   </repositories>  

maven-clean,然后maven-update，ok！
2、Cannot change version of project facet Dynamic web module to 2.5
这个是我从网上下载demo的时候，出现的问题，原因是catalog比较老，用的servlet还是2.3的，按照下面步骤就可以解决
1.把Servlet改成2.5，打开项目的web.xml，改之前：

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>  

改后：

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>  

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

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  

把1.5改成1.6

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  

打开org.eclipse.wst.common.component

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>  

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

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>  

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

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>  

把改成，把 改成

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>  

待续。。。。