JSF如何在我的应用程序中显示pom.xml版本

我正试图在JSF中重写一个遗留应用程序，而其他被重写的应用程序在页脚中发布了maven版本。

我正试图弄清楚他们是如何做到的，到目前为止，我已经弄清楚他们在做什么：

页脚.xhtml

<h:outputText id="fullBuildString" value="#{ApplicationInfo.fullBuildString}" />

ApplicationInfoBacking.java

public class ApplicationInfoBacking {
    private String             buildTime;
    private String             iteration;
    private String             version;
    private String             inception;
    private String             fullBuildString;
    @PostConstruct
    public void init() {
        fullBuildString = generateFullBuildString();
    }
    public String getBuildTime() {
        return buildTime;
    }
    public void setBuildTime(final String buildTime) {
        this.buildTime = buildTime;
    }
    public String getIteration() {
        return iteration;
    }
    public void setIteration(final String iteration) {
        this.iteration = iteration;
    }
    public String getVersion() {
        return version;
    }
    public void setVersion(final String version) {
        this.version = version;
    }
    public String getInception() {
        return inception;
    }
    public void setInception(final String inception) {
        this.inception = inception;
    }
    /**
     * @return ApplicationName vVersion (Iteration) BuildTime
     */
    public String getFullBuildString() {
        return fullBuildString;
    }
    public String generateFullBuildString() {
        if ((version == null) || "".equals(version.trim())) {
            version = "Unknown version";
        }
        if ((iteration == null) || "".equals(iteration.trim())) {
            iteration = "Unknown iteration";
        }
        if ((buildTime == null) || "".equals(buildTime.trim())) {
            buildTime = "Unknown build time";
        }
        final StringBuilder build = new StringBuilder();
        build.append("v. ").append(version);
        if (!Phase.PRODUCTION.equals(PlatformUtil.getPhase()) && !Phase.BETA.equals(PlatformUtil.getPhase())) {
            build.append(" (").append(iteration).append(")");
            build.append(" ").append(buildTime);
        }
        return build.toString();
        }
}

faces-config.xml

<managed-bean>
        <managed-bean-name>ApplicationInfo</managed-bean-name>
        <managed-bean-class>path.to.class.ApplicationInfoBacking</managed-bean-class>
        <managed-bean-scope>application</managed-bean-scope>
        <managed-property>
            <property-name>buildTime</property-name>
            <value>#{initParam.buildTime}</value>
        </managed-property>
        <managed-property>
            <property-name>iteration</property-name>
            <value>#{initParam.iteration}</value>
        </managed-property>
        <managed-property>
            <property-name>version</property-name>
            <value>#{initParam.version}</value>
        </managed-property>
        <managed-property>
            <property-name>inception</property-name>
            <value>#{initParam.inception}</value>
        </managed-property>
    </managed-bean>

web.xml

<context-param>
        <param-name>buildTime</param-name>
        <param-value>${buildNumber}</param-value>
    </context-param>
    <context-param>
        <param-name>iteration</param-name>
        <param-value>${iteration}</param-value>
    </context-param>
    <context-param>
        <param-name>version</param-name>
        <param-value>${pom.version}</param-value>
    </context-param>

这是我加载应用程序时实际显示的内容：

v. ${pom.version}

由于某种原因，${pom.version}没有被解释。

有人知道为什么吗？