Servlets 调用ServletContextGetResourcePath（）时位于org.zkoss.less.ZKLessServlet.initLessResource的java.lang.NullPointerException

我正在使用ZK7，ZKLess

<?xml version="1.0" encoding="UTF-8"?>
    <web-app id="WebAppId" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
        xsi="http://www.w3.org/2001/XMLSchema-instance"
        schemalocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
      <display-name>SAMPLE</display-name>       
        <servlet>
            <servlet-name>zkLess</servlet-name>
            <servlet-class>org.zkoss.less.ZKLessServlet</servlet-class>
            <init-param>
                <param-name>org.zkoss.less.LessResource</param-name>
                <param-value>/css/less/*</param-value><!-- specify to the folder that contains *.less -->
            </init-param>
            <init-param>
                <param-name>org.zkoss.less.OutputFormat</param-name>
                <param-value>.css.dsp</param-value><!-- specify output file suffix, default .css.dsp -->
            </init-param>
            <init-param>
                <param-name>org.zkoss.less.CompressOutput</param-name>
                <param-value>true</param-value><!-- compress output, default true -->
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>zkLess</servlet-name>
            <url-pattern>*.less</url-pattern><!-- specify to folder that contains *.less -->
        </servlet-mapping>
       <distributable/>
     </web-app>

---

可能还会显示代码。我正在尝试将less filesample.less编译为sample.css.dsp，我在web.xml中为其添加了以下代码。我在应用程序启动时遇到了错误。你能附加完整的堆栈跟踪吗？@Kenju:你能停止机器人编辑吗？您编辑的几篇文章存在的问题不仅仅是空指针异常部分。这看起来太像声誉收获了。如果这里有任何机器人审批人以某种方式阅读了此评论，请停止滥用审查系统，因为您可以审查严重违反的访问要求。这简直是疯了。

SEVERE: Servlet /IPSMWeb threw load() exception
java.lang.NullPointerException
    at org.zkoss.less.ZKLessServlet.initLessResource(ZKLessServlet.java:121)
    at org.zkoss.less.ZKLessServlet.init(ZKLessServlet.java:90)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1190)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1010)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4957)
    at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5284)
    at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5279)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)