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Cannot change version of project facet Dynamic Web Module to 3.0 requires Java 1.6 or newer 解决方案

古月无语 2023-05-11 阅读 74

Eclipse Maven 开发一个 jee 项目时,编译时遇到以下错误

Description Resource Path Location Type

Dynamic Web Module 3.0 requires Java 1.6 or newer. bdp line 1 Maven Java EE Configuration Problem


Description Resource Path Location Type

One or more constraints have not been satisfied. bdp line 1 Maven Java EE Configuration Problem

如图:

Cannot change version of project facet Dynamic Web Module to 3.0 requires Java 1.6 or newer 解决方案_maven


但是 Eclipse 明明已经将编译级别设置为 1.7:

Cannot change version of project facet Dynamic Web Module to 3.0 requires Java 1.6 or newer 解决方案_maven_02


这是由于你的 Maven 编译级别是 jdk1.5 或以下,而你导入了 jdk1.6 以上的依赖包:查看 Eclipse 的 Navigator 视图下该项目的 .classpath 文件:


<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/J2SE-1.5">  
<attributes>  
<attribute name="maven.pomderived" value="true"/>  
</attributes>  
</classpathentry>

解决办法
使用 maven-compiler-plugin 将 maven 编译级别改为 jdk1.6 以上:

<build>  
<plugins>  
<!-- define the project compile level -->  
<plugin>  
<groupId>org.apache.maven.plugins</groupId>  
<artifactId>maven-compiler-plugin</artifactId>  
<version>2.3.2</version>  
<configuration>  
<source>1.7</source>  
<target>1.7</target>  
</configuration>  
</plugin>  
</plugins>  
</build>

dynamic web module 版本之间的区别:

Servlet 3.0

December 2009

JavaEE 6, JavaSE 6

Pluggability, Ease of development, Async Servlet, Security, File Uploading

Servlet 2.5

September 2005

JavaEE 5, JavaSE 5

Requires JavaSE 5, supports annotations

Servlet 2.4

November 2003

J2EE 1.4, J2SE 1.3

web.xml

错误Cannot change version of project facet Dynamic Web Module to 3.0:
在项目右键属性的Project facts中把Dynamci Web Module设置为3.0,如果报错则直接修改项目文件:工程.settings目录下的org.eclipse.wst.common.project.facet.core.xml,同时把web.xml开头设置由2.5改成3.0为:

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_3_0.xsd" version="3.0" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">


然后执行项目右键Maven的Update Project...即可。



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