Jakarta EE 10与Eclipse EE兼容性及JSF 4.0支持启用问题

背景问题 #

Eclipse IDE for Enterprise Java and Web Developers（2024-12版本）是否兼容Jakarta EE 10？在创建动态Web项目时，遇到JSF 4.0支持缺失的问题，疑似遗漏了相关配置。

项目生成的配置文件 #

.classpath 文件 #

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21"/>
    <classpathentry kind="src" path="src/main/java"/>
    <classpathentry kind="con" path="org.jboss.ide.eclipse.as.core.server.runtime.runtimeTarget/WildFly 27.0 Runtime">
        <attributes>
            <attribute name="owner.project.facets" value="jst.web;jst.jsf"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>
    <classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
    <classpathentry kind="output" path="build/classes"/>
</classpath>

.project 文件 #

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
    <name>reproduction</name>
    <comment></comment>
    <projects>
    </projects>
    <buildSpec>
        <buildCommand>
            <name>org.eclipse.jdt.core.javabuilder</name>
            <arguments>
            </arguments>
        </buildCommand>
        <buildCommand>
            <name>org.eclipse.wst.common.project.facet.core.builder</name>
            <arguments>
            </arguments>
        </buildCommand>
        <buildCommand>
            <name>org.eclipse.wst.validation.validationbuilder</name>
            <arguments>
            </arguments>
        </buildCommand>
    </buildSpec>
    <natures>
        <nature>org.eclipse.jem.workbench.JavaEMFNature</nature>
        <nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature>
        <nature>org.eclipse.wst.common.project.facet.core.nature</nature>
        <nature>org.eclipse.jdt.core.javanature</nature>
        <nature>org.eclipse.wst.jsdt.core.jsNature</nature>
    </natures>
</projectDescription>

JSF页面验证问题 #

生成的index.xhtml页面，无论是使用旧的Java EE命名空间（http://java.sun.com/jsf/*）还是符合JSF 4.0标准的Jakarta EE命名空间（jakarta.faces.*），Eclipse均提示“找不到facelet标签库”，代码补全功能也无法正常工作。页面代码如下：

<!-- this part is generated by Eclipse, and not JSF 4.0 compilant:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core">

not the below correct, nor the above incorrect URLs can get Eclipse to find the tag library; it gives the error: "Can't find the facelet tag library." And code completion doesn't work.

-->
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE html>
<html lang="en" 
      xmlns:h="jakarta.faces.html"
      xmlns:f="jakarta.faces.core"
      xmlns:ui="jakarta.faces.facelets">

<f:loadBundle basename="resources.application" var="msg"/>

<head>
    <title><h:outputText value="#{msg.welcomeTitle}" /></title>
</head>

<body>
<h3><h:outputText value="#{msg.welcomeHeading}" /></h3>
<p><h:outputText value="#{msg.welcomeMessage}" /></p>
</body>
</html>

核心限制 #

当前Eclipse的项目特性设置中，JSF版本最高仅支持到2.3，无法选择对应Jakarta EE 10的JSF 4.0版本，导致页面无法被正常验证。

求助问题 #

1. Jakarta EE 10是否兼容Eclipse IDE for Enterprise Java and Web Developers？
2. 如何在Eclipse中启用JSF 4.0支持？

内容的提问来源于stack exchange，提问作者zebalu