Maven， eclipse， servlet api 3.1.0.Eclipse抱怨"cannot change version of project facet Dynamic Web Modul

Question

我使用maven simple webapp原型创建了一个webapp，然后添加了以下依赖项:

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>

我还将web.xml文件更改为使用3.1版本:

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
        http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">

我将java编译器版本更改为1.8。Eclipse现在报错:

Cannot change version of project facet Dynamic Web Module to 3.1.
One or more constraints have not been satisfied.

知道如何消除这个错误吗?

Answer 1

你可以试试:在您的项目目录中。

.settings/org.eclipse.jdt.core。设置为1.8

eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8  
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.8
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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=1.8

.settings/org.eclipse.wst.common.project.facet.core.xml
改变jst。Web版本为3.1,Java版本为1.8

<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<fixed facet="wst.jsdt.web"/>
<installed facet="wst.jsdt.web" version="1.0"/>
<installed facet="jst.web" version="3.1"/>
<installed facet="java" version="1.8"/>
</faceted-project>

然后再次导入项目。希望对大家有所帮助