problems with minim and processing - audio

Question

trying to create a sound sampler that can play a recorded sample at different frequencies/rates and am using TickRate to change the rate of playback, similar to the TickRate example. when i run i get a NullPointerException here player.patch(rateControl).patch(out); but can't figure out why, any ideas why?
import ddf.minim.*;
import ddf.minim.analysis.*;
import ddf.minim.signals.*;
import ddf.minim.ugens.*;
import ddf.minim.spi.*;
Minim minim;
AudioOutput out;
AudioSample sample1;
AudioInput in;
AudioRecorder recorder;
boolean recorded;
FilePlayer player;
TickRate rateControl;
void setup()
{
size(512, 200, P3D);
minim = new Minim(this);
in = minim.getLineIn(Minim.STEREO, 512);
recorder = minim.createRecorder(in, "myrecording2.wav");
rateControl = new TickRate(1.f);
out = minim.getLineOut(Minim.STEREO, 512);
player.patch(rateControl).patch(out);
textFont(createFont("Arial", 12));
}
void draw()
{
if ( recorder.isRecording() )
{
fill(255,255,255);
text("Now recording, press the r key to stop recording.", 5, 310);
}
else if ( !recorded )
{
fill(255,255,255);
text("Press the r key to start recording.", 5, 315);
}
else
{
fill(255,255,255);
text("Press the q key to save the recording to disk as a sample.", 5, 315);
}
for(int i = 0; i < out.bufferSize() - 1; i++)
{
float x1 = map(i, 0, out.bufferSize(), 0, width);
float x2 = map(i+1, 0, out.bufferSize(), 0, width);
line(x1, 50 + out.left.get(i)*50, x2, 50 + out.left.get(i+1)*50);
line(x1, 150 + out.right.get(i)*50, x2, 150 + out.right.get(i+1)*50);
}
}
void keyReleased()
{
if ( !recorded && key == 'r' )
{
if ( recorder.isRecording() )
{
recorder.endRecord();
recorded = true;
}
else
{
recorder.beginRecord();
}
}
if ( recorded && key == 'q' )
{
player = new FilePlayer( recorder.save() );
sample1 = minim.loadSample( "myrecording.wav" , 512 );
if ( sample1 == null ) println("didn't get sample");
}
}
void keyPressed()
{
if ( key == 's' )
{
sample1.trigger();
}
else if ( key == 'd' )
{
rateControl.value.setLastValue(3.0f);
sample1.trigger();
}
}

Answer 1

You only set player equal to something in the keyReleased() function. So when setup() is run, player still has the default null value.
Taking a step back, you should get into the habit of debugging your code. When you get a NullPointerException, try printing out the value of every variable on that line. You'll find which one is null, and then you can figure out why.