私はちょうどjmathplotを始めていると私はこの例外メッセージ

Question

私は アプリケーションに グラフをプロットしたい

を得たので、私はjmathplot.jarをダウンロードして自分のプロジェクトにこれを追加しました。

私は私のフレームにフィールドを追加します。

private PlotPanel plot = new Plot2DPanel(); 

私は、コンパイル時に厄介な長い例外メッセージが表示されます。

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/math/io/StringPrintable at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.math.plot.canvas.PlotCanvas.(PlotCanvas.java:491) at org.math.plot.canvas.Plot2DCanvas.(Plot2DCanvas.java:25) at org.math.plot.Plot2DPanel.(Plot2DPanel.java:47) at Frame1.initialize(Frame1.java:39) at Frame1.(Frame1.java:31) at Frame1$1.run(Frame1.java:18) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$500(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: org.math.io.StringPrintable at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 32 more

何が起こっていますか？

EDIT

OK。私はjmathio.jarを輸入しました。今、私はエラーを得た：

java.lang.NullPointerException 
    at javax.swing.ImageIcon.<init>(Unknown Source) 
    at org.math.plot.components.PlotToolBar.<init>(PlotToolBar.java:61) 
    at org.math.plot.PlotPanel.addPlotToolBar(PlotPanel.java:149) 
    at org.math.plot.PlotPanel.<init>(PlotPanel.java:59) 
    at org.math.plot.PlotPanel.<init>(PlotPanel.java:67) 
    at org.math.plot.Plot2DPanel.<init>(Plot2DPanel.java:31) 
    at Frame1.<init>(Frame1.java:10) 
    at Frame1$1.run(Frame1.java:19) 
    at java.awt.event.InvocationEvent.dispatch(Unknown Source) 
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
    at java.awt.EventQueue.access$500(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) 
    at java.awt.EventQueue.dispatchEvent(Unknown Source) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.run(Unknown Source) 

Answer 1

、あなたのクラスパスに https://github.com/yannrichet/jmathio/blob/master/dist/jmathio.jar jarファイルを含める必要があります。 jmathplot.jarはjmathio.jarに依存します。したがって、これをダウンロードしてクラスパスに入れてください。