NullPointerException after Synth.start() with deviceIds about jsyn HOT 8 CLOSED

I tried but could not reproduce this error. Maybe you have different devices.

Here is the output I get by running the attached file as a unit test.

java.version = 1.8.0_45, java.vendor = Oracle Corporation, os.arch = x86_64
INPUT device = 0, channels = 2
OUTPUT device = 0, channels = 2
Aug 01, 2016 8:52:13 AM com.jsyn.engine.SynthesisEngine start
INFO: Pure Java JSyn from www.softsynth.com, rate = 96000, RT, V16.7.5 (build 459, 2015-11-02)
2016-08-01 08:52:13.679 java[17005:13887572] 08:52:13.679 WARNING: 140: This application, or a library it uses, is using the deprecated Carbon Component Manager for hosting Audio Units. Support for this will be removed in a future release. Also, this makes the host incompatible with version 3 audio units. Please transition to the API's in AudioComponent.h.
Aug 01, 2016 8:52:15 AM com.jsyn.engine.SynthesisEngine run
INFO: JSyn synthesis thread in finally code.
java.version = 1.8.0_45, java.vendor = Oracle Corporation, os.arch = x86_64
Aug 01, 2016 8:52:16 AM com.jsyn.engine.SynthesisEngine start
INFO: Pure Java JSyn from www.softsynth.com, rate = 96000, RT, V16.7.5 (build 459, 2015-11-02)
INPUT device = 0, channels = 2
OUTPUT device = 0, channels = 2
java.version = 1.8.0_45, java.vendor = Oracle Corporation, os.arch = x86_64
INPUT device = 0, channels = 2
OUTPUT device = 0, channels = 2
Aug 01, 2016 8:52:18 AM com.jsyn.engine.SynthesisEngine run
INFO: JSyn synthesis thread in finally code.
#0: Default Audio Device, 2 inputs, 2 outputs
#1: Built-in Microphone, 2 inputs, 0 outputs
#2: Built-in Output, 0 inputs, 2 outputs
#3: Port Built-in Microphone, 0 inputs, 0 outputs
#4: Port Built-in Output, 0 inputs, 0 outputs

TestSynth.java.txt

BTW, I notice you have two calls to start() in your error log. I tried starting twice but it still worked.

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So the issue, I think, was in the 2nd call to start (in some cases, the engine apparently needed to be restarted, I'm not sure why), which used the following code:

Synth.stop();
Synth.start(flag, rate, inDevID, inDevChNum, outDevID, outDevChNum);

which appears to cause the NullPointerException. When I changed this code to:

Synth.stop();
Synth.terminate();

Synth.initialize();
Synth.start(flag, rate, inDevID, inDevChNum, outDevID, outDevChNum);

things again work ok...

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Thanks! I modified my test and can now reproduce the crash. It appears that JavaSound streams can take 1200 msec to close! But I was only waiting for 1000 msec. So there was a race condition.

Instead of start-stop-start-stop I has start-start-stop-stop.

The delayed stop() clobbered the stream created by the second start. I know how to fix this. Thanks for reporting it.

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Now I need to update the downloadable JAR files.

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The new JAR files are posted on the JSyn site. Please let me know if they fix the problem for you.

http://www.softsynth.com/jsyn/developers/download.php

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Question: what is the proper sequence for restarting the synth engine? Synth.stop, then Synth.start OR Synth.stop, Synth.terminate, Synth.initialize, Synth.start?

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You should be able to Synth.stop() then Synth.start(). If not then it is a bug.

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I think this is fixed now. If not then let me know and I will reopen it.

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