java - jpl 库不适用于 java maven 项目

Question

我在项目中使用 jpl 库时遇到问题。

奇怪的是，在一个旧项目中，这是一个普通的 Java 应用程序，通过遵循此解决方案 JPL/SWI Prolog configuration failure 可以很好地与 jpl 库一起工作.该解决方案提到我必须配置我的环境变量才能使库与 Java 对话。

另一方面，我的新项目是maven项目。首先，我包含了 Maven 的以下依赖项。

    <dependency>
        <groupId>jpl</groupId>
        <artifactId>jpl</artifactId>
        <version>7.4.0</version>
        <type>jar</type>
    </dependency>

但我遇到了以下异常:

Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: org.jpl7.fli.Prolog.current_query()Lorg/jpl7/fli/qid_t; at org.jpl7.fli.Prolog.current_query(Native Method) at org.jpl7.Query.close(Query.java:540) at org.jpl7.Util.textToTerm(Util.java:130) at org.jpl7.Query.(Query.java:185) at com.michalistourism.core.PrologHandler.RunGorgias(PrologHandler.java:47) at com.persistence.TourismSession.RunPrologFile(TourismSession.java:281) at com.michalistourism.tourismassistant.ChatBoxPanel.btnDoNowActionPerformed(ChatBoxPanel.java:109) at com.michalistourism.tourismassistant.ChatBoxPanel.access$100(ChatBoxPanel.java:22) at com.michalistourism.tourismassistant.ChatBoxPanel$2.actionPerformed(ChatBoxPanel.java:74) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6533) at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6298) at java.awt.Container.processEvent(Container.java:2236) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466) at java.awt.Container.dispatchEventImpl(Container.java:2280) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

这是我抛出上述异常的代码片段。

    public PrologReaderCollection RunGorgias(List<Context> contexts) { 

    JPL.init();

    String filename = prologFilePath;

    filename = filename.replace('\\', '/');
    String t1 = "consult('" + filename + "')";
    PrologReaderCollection output = new PrologReaderCollection();
    Integer count =1;

    for(Context cont : contexts) {
        Query q1 = new Query(t1);
        //Query q1 = new Query("consult",new Term[] {new Atom(t1)});
        if (q1.hasNext()) {
            String Request = "prove([" + cont.getName().toLowerCase() + "(" + cont.getParameters() + ")],Expl).";
            q1 = new Query(Request);
            while (q1.hasNext()) {
                    Map<String, Term> map = q1.nextSolution();
                    String expl = map.get("Expl").toString();
                    PrologReader pr = new PrologReader("Solution " + count + " for " + cont.getName().toLowerCase() + ":\n"  + expl + "\n\n",cont.getSet(),cont.getName().toLowerCase());
                    output.add(pr);
                    count += 1;

                    if(count > 3) {
                        break;
                    }
            }
        }
        count = 1;
    }

    return output;
}

然后我尝试添加一个指向 jpl jar 的 maven 依赖项，我在以前的 Java 项目中使用了它，其中 jar 文件位于项目 lib 文件夹中。

    <dependency>
        <groupId>jpl</groupId>
        <artifactId>jpl</artifactId>
        <version>7.4.0</version>
        <scope>system</scope>
        <systemPath>${basedir}/lib/jpl.jar</systemPath>
    </dependency> 

本例中的新异常如下:

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/jpl7/JPL at com.michalistourism.core.PrologHandler.RunGorgias(PrologHandler.java:37) at com.persistence.TourismSession.RunPrologFile(TourismSession.java:281) at com.michalistourism.tourismassistant.ChatBoxPanel.btnDoNowActionPerformed(ChatBoxPanel.java:109) at com.michalistourism.tourismassistant.ChatBoxPanel.access$100(ChatBoxPanel.java:22) at com.michalistourism.tourismassistant.ChatBoxPanel$2.actionPerformed(ChatBoxPanel.java:74) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6533) at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6298) at java.awt.Container.processEvent(Container.java:2236) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466) at java.awt.Container.dispatchEventImpl(Container.java:2280) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) Caused by: java.lang.ClassNotFoundException: org.jpl7.JPL at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 41 more

有什么我可以做的吗？

Answer 1

我通过引用 jpl 的 7.0.1 版本而不是 7.4.0 版本的 maven 设法找到了解决我的问题的方法，并且成功了!显然我需要旧版本的库。

<dependency>
     <groupId>jpl</groupId>
     <artifactId>jpl</artifactId>
     <version>7.0.1</version>  
</dependency>