Cannot change version of project facet Dynamic web module to 2.5
2018-03-27 21:35
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在Eclipse中新建了一个web项目,但是项目上报错,有红色小叉叉,但是展开项目,子项目上并没有报错,单是这样看的话找不到错误在哪里。打开Markers窗口,提示pom.xml文件有错,但是无论怎么改都不起作用,这个问题让人很无语,知道有错,但却不知道该怎么改。不过,在伟大的江江同学的帮助下,最后终于解决了。原来是这样的:我们用Eclipse创建Maven结构的web项目的时候选择了Artifact Id为maven-artchetype-webapp,由于这个catalog比较老,用的servlet还是2.3的,而一般现在至少都是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:首先在出错文件上右击:
找到Porject Facets,把Dynamic Web Module的版本改为2.5。
貌似很简单嘛,但是,这个时候往往是不允许修改的,我们在修改这里之前,还要做一些准备工作才行。那么,都需要做哪些准备工作呢?第一、打开项目的web.xml,把Servlet改成2.5修改之前:
[html] view plain copy<!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>
修改之后:[html] view plain copy<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">
第二、修改项目的设置,在Navigator下打开项目.settings目录下的org.eclipse.jdt.core.prefs
修改为[html] view plain copyeclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
org.eclipse.jdt.core.compiler.compliance=1.7
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=1.7
打开org.eclipse.wst.common.component,将project-version修改为1.7.0[html] view plain copy<?xml version="1.0" encoding="UTF-8"?>
<project-modules id="moduleCoreId" project-version="1.7.0">
开org.eclipse.wst.common.project.facet.core.xml,<installed facet="java" version="1.7"/>, <installed facet="jst.web" version="2.5"/>[html] view plain copy<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<fixed facet="wst.jsdt.web"/>
<installed facet="wst.jsdt.web" version="1.0"/>
<installed facet="java" version="1.7"/>
<installed facet="jst.web" version="2.5"/>
<installed facet="jst.jaxrs" version="1.1"/>
<installed facet="jst.jsf" version="2.0"/>
</faceted-project>
好了,准备工作完成,再打开看看,是不是已经把Dynamic web module改成了2.5
总结:虽然完成了,但是这种方法很麻烦,应该还有其他更加简便且治本的方法,应该可以预先设置,还应该再找找的。先解决问题再说。
找到Porject Facets,把Dynamic Web Module的版本改为2.5。
貌似很简单嘛,但是,这个时候往往是不允许修改的,我们在修改这里之前,还要做一些准备工作才行。那么,都需要做哪些准备工作呢?第一、打开项目的web.xml,把Servlet改成2.5修改之前:
[html] view plain copy<!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>
修改之后:[html] view plain copy<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">
第二、修改项目的设置,在Navigator下打开项目.settings目录下的org.eclipse.jdt.core.prefs
修改为[html] view plain copyeclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
org.eclipse.jdt.core.compiler.compliance=1.7
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=1.7
打开org.eclipse.wst.common.component,将project-version修改为1.7.0[html] view plain copy<?xml version="1.0" encoding="UTF-8"?>
<project-modules id="moduleCoreId" project-version="1.7.0">
开org.eclipse.wst.common.project.facet.core.xml,<installed facet="java" version="1.7"/>, <installed facet="jst.web" version="2.5"/>[html] view plain copy<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<fixed facet="wst.jsdt.web"/>
<installed facet="wst.jsdt.web" version="1.0"/>
<installed facet="java" version="1.7"/>
<installed facet="jst.web" version="2.5"/>
<installed facet="jst.jaxrs" version="1.1"/>
<installed facet="jst.jsf" version="2.0"/>
</faceted-project>
好了,准备工作完成,再打开看看,是不是已经把Dynamic web module改成了2.5
总结:虽然完成了,但是这种方法很麻烦,应该还有其他更加简便且治本的方法,应该可以预先设置,还应该再找找的。先解决问题再说。
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