Java Gate embedded

Question

I am trying to use Gate embedded to extract some entities. I included the jar files from the bin and lib folder this is the code:

    Out.prln("Initialising GATE...");
    Properties props = System.getProperties();
    props.setProperty("gate.home", "/Applications/GATE_Developer_8.2");
    SwingUtilities.invokeAndWait(new Runnable() { 
        public void run() {
            MainFrame.getInstance().setVisible(true);
            try {
                Factory.newDocument("This is a document");
            } catch (ResourceInstantiationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();

but I always get the following exception. Does anyone know what I am doing wrong? Thanks

Exception in thread "main" java.lang.reflect.InvocationTargetException
    at java.awt.EventQueue.invokeAndWait(EventQueue.java:1312)
    at java.awt.EventQueue.invokeAndWait(EventQueue.java:1287)
    at javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1348)
    at gate.Gate.main(Gate.java:25)
Caused by: java.lang.NoSuchMethodError: gate.Gate.getUserConfig()Lgate/util/OptionsMap;
    at gate.swing.XJFileChooser.getLocations(XJFileChooser.java:140)
    at gate.swing.XJFileChooser.<init>(XJFileChooser.java:70)
    at gate.gui.MainFrame.<init>(MainFrame.java:493)
    at gate.gui.MainFrame.getInstance(MainFrame.java:352)
    at gate.gui.MainFrame.getInstance(MainFrame.java:348)
    at gate.Gate$1.run(Gate.java:27)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:301)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:749)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:702)
    at java.awt.EventQueue$3.run(EventQueue.java:696)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:719)
    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)

Answer 1

You have this error because the class is in the classpath but its version doesn't match with your need. The class is found but you invoke a method which doesn't exist in the version of this class.

I think that you should use a more recent version of the GATE library.

For example this version https://gate.ac.uk/releases/gate-3.1-build2270-ALL/doc/javadoc/ contains the gate.Gate class providing the public method OptionsMap getUserConfig().

Answer 2

When looking on the stack trace, I think your main class is named gate.Gate - the same name as the central class of the GATE library. And this conflict of names causes the problem.

Just rename your class or change its package and the error should be gone.