Problems with javax.speech

[Tanthalas]

OK, so I'm wanting to mess around with Java's speech capabilities - see what can be done.  I've found FreeTTS, and I grabbed the JSAPI.jar file out of their distribution.  I stole a few HelloWorld programs from the Java Speech API Programmer's Guide, put them into IDEA, added the JSAPI.jar as an external JAR library and hit "Run."  On both programs I get a NullPointException when allocate() is called on the synthesizer and recogniser created by javax.speech.Central.  The synthesis program is shown below.  No syntax errors inside IDEA or Eclipse.  When I try to compile from the command line, the compile succeeds, but at runtime I get a NoClassDefFoundError on javax.speech.EngineModeDesc, despite it being part of the included JAR.

The heck?  Anyone got any ideas as to why this is happening?  Can't find anything on Google.

TIA

Code:

import javax.speech.*;
import javax.speech.synthesis.*;
import java.util.Locale;

public class HelloWorld {
public static void main(String args[]) {
try {
// Create a synthesizer for English
Synthesizer synth = Central.createSynthesizer(
new SynthesizerModeDesc(Locale.ENGLISH));

// Get it ready to speak
synth.allocate();
synth.resume();

// Speak the "Hello world" string
synth.speakPlainText("Hello, world!", null);

// Wait till speaking is done
synth.waitEngineState(Synthesizer.QUEUE_EMPTY);

// Clean up
synth.deallocate();
} catch (Exception e) {
e.printStackTrace();
}
}
}