创建Seam自定义EL函数时出错

Question

我尝试在seam 2.2中创建一个自定义el函数，方法如下http://seamframework.org/Documentation/CreatingCustomELFunctions

标签库内容为:

<?xml version="1.0"?>
<!DOCTYPE facelet-taglib PUBLIC "-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN" "facelet-taglib_1_0.dtd">
<facelet-taglib>
     <library-class>org.el.func.FnLibrary</library-class>
</facelet-taglib>

但是在运行时，得到以下解析错误:

SEVERE [compiler] Error Loading Library: vfszip:/home/anand/jboss-5.1.0.GA/server/default/deploy/stagebitz.ear/stagebitz.jar/META-INF/elfunctions.taglib.xml
java.io.IOException: Error parsing [vfszip:/home/anand/jboss-5.1.0.GA/server/default/deploy/stagebitz.ear/stagebitz.jar/META-INF/elfunctions.taglib.xml]: 

Caused by: org.xml.sax.SAXException: Error Handling [vfszip:/home/anand/jboss-5.1.0.GA/server/default/deploy/stagebitz.ear/stagebitz.jar/META-INF/elfunctions.taglib.xml@4,57] <library-class>
at com.sun.facelets.compiler.TagLibraryConfig$LibraryHandler.endElement(TagLibraryConfig.java:271)

使用JSF 1.2

在web.xml中使用以下参数。

 <context-param>
      <param-name>javax.faces.FACELETS_LIBRARIES</param-name>
      <param-value>
        /WEB-INF/elfunctions.taglib.xml
    </param-value>
   </context-param>

Answer 1

映射isEmpty的示例:

<!DOCTYPE facelet-taglib PUBLIC
        "-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN"
        "http://java.sun.com/dtd/facelet-taglib_1_0.dtd">
<facelet-taglib>
     <namespace>yournamespace</namespace>
    <function>
        <function-name>functionname</function-name>
        <function-class>fullclanmae</function-class>
        <function-signature>java.lang.Boolean isEmpty(java.util.Set)</function-signature>
    </function>
</facelet-taglib>

把它放在你的类路径中，它将与web.xml中的任何内容一起工作