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

1、打开新建的servlet文件例如（hibernate.cfg.xml）修改头文件为

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

2、打开项目所在目录下的.settings文件夹

2.1修改项目的设置，打开项目.settings目录下的org.eclipse.jdt.core.prefs（打开工具例如NOTEPAD ）

把1.5改成1.8，例如：

1 eclipse.preferences.version=1
2 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
3 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
4 org.eclipse.jdt.core.compiler.compliance=1.8
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=1.8

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2.2打开org.eclipse.wst.common.project.facet.core.xml

把<installed facet="java" version="1.5"/>改成<installed facet="java" version="1.8"/>，把 <installed facet="jst.web" version="2.3"/>改成 <installed facet="jst.web" version="3.0"/>

1 <?xml version="1.0" encoding="UTF-8"?>
2 <faceted-project>
3   <fixed facet="wst.jsdt.web"/>
4   <installed facet="jst.web" version="3.0"/>
5   <installed facet="wst.jsdt.web" version="1.0"/>
6   <installed facet="jboss.m2" version="1.0"/>
7   <installed facet="java" version="1.8"/>
8   <installed facet="jst.cdi" version="1.0"/>
9 </faceted-project>

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3、打开存放依赖的pom.xml文件，修改最下面的

<build>
<finalName>D5.22hotai</finalName>

</build>

为

 1  <build>
 2     <finalName>D5.22hotai</finalName>
 3      <plugins>  
 4         <plugin>  
 5             <groupId>org.apache.maven.plugins</groupId>  
 6             <artifactId>maven-compiler-plugin</artifactId>  
 7             <version>3.3</version>  
 8             <configuration>  
 9                 <!-- 指定source和target的版本 -->                 
10                 <source>1.8</source>  
11                 <target>1.8</target>  
12             </configuration>  
13         </plugin>  
14     </plugins>  
15   </build>