Java Apache Commons SCXML-找不到JexlContext

我是SCXML新手，甚至连最简单的应用程序都启动不了。当我尝试启动它时，我得到以下异常。但是我有一个库

commons-scxml-0.9.jar

，其中类位于类路径上。有什么想法吗

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/jexl/JexlContext
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.apache.commons.scxml.env.AbstractStateMachine.<init>(AbstractStateMachine.java:103)
at main.StateMachineImpl.<init>(StateMachineImpl.java:8)
at main.Main.main(Main.java:6)

Caused by: java.lang.ClassNotFoundException: org.apache.commons.jexl.JexlContext
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 15 more

事件

public enum Event {

    START("event.start"), STOP("event.stop");

    private String event;

    private Event(String event) {
        this.event = event;
    }

    public String getEvent() {
        return event;
    }

    public void setEvent(String event) {
        this.event = event;
    }

}

StateMachineImpl

public class StateMachineImpl extends AbstractStateMachine {

    public StateMachineImpl() {
        super(StateMachineImpl.class.getClassLoader().getResource("state-machine-cfg.xml"));
    }

    public void off() {
        System.out.println("StateMachine is OFF");
    }

    public void running() {
        System.out.println("StateMachine is RUNNING");
    }

}

状态机cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
    initialstate="off">

    <state id="off">
        <transition event="event.start" target="running" />
    </state>

    <state id="running">
        <transition event="event.stop" target="off" />
    </state>

</scxml>

添加到类路径。根据版本0.9中的项目，您还需要（不包括传递Dependencies）：

• commons日志记录

• commons消化池

• commons beanutils

• commons el

---

可以在此处找到所有SCXML依赖项jar：

---

谢谢。我只需要添加

commons日志

，

commons jexl

和

xalan

库。我最喜欢pom.xml解决方案，这是一个很好的工作。

<?xml version="1.0" encoding="UTF-8"?>
<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
    initialstate="off">

    <state id="off">
        <transition event="event.start" target="running" />
    </state>

    <state id="running">
        <transition event="event.stop" target="off" />
    </state>

</scxml>

<dependency>
    <groupId>commons-scxml</groupId>
    <artifactId>commons-scxml</artifactId>
    <version>0.9</version>
</dependency>
<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.1.1</version>
</dependency>
<dependency>
    <groupId>commons-jexl</groupId>
    <artifactId>commons-jexl</artifactId>
    <version>1.1</version>
</dependency>
<dependency>
    <groupId>xalan</groupId>
    <artifactId>xalan</artifactId>
    <version>2.7.1</version>
</dependency>