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POCMU-Sphinx : NullPointerException at recognizer.allocate()
 

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    <p>I've been trying to set up CMU-Sphinx4 on my PC in order to make an application using speech Recognition. I was able to setup most of the parts and configuration and trying to run the HelloWorld application provided by Sphinx, but stuck with <code>NullPointerExcetption</code> at <code>recognizer.allocate();</code>.</p> <p>Complete Stack Trace :</p> <pre><code>12:34:45.501 WARNING dictionary Missing word: &lt;sil&gt; 12:34:45.517 WARNING jsgfGrammar Can't find pronunciation for &lt;sil&gt; 12:34:45.517 WARNING dictionary Missing word: &lt;sil&gt; 12:34:45.517 WARNING jsgfGrammar Can't find pronunciation for &lt;sil&gt; Exception in thread "main" java.lang.NullPointerException at edu.cmu.sphinx.linguist.flat.SentenceHMMState.collectStates(SentenceHMMState.java:635) at edu.cmu.sphinx.linguist.flat.FlatLinguist.compileGrammar(FlatLinguist.java:452) at edu.cmu.sphinx.linguist.flat.FlatLinguist.allocate(FlatLinguist.java:304) at edu.cmu.sphinx.decoder.search.SimpleBreadthFirstSearchManager.allocate(SimpleBreadthFirstSearchManager.java:646) at edu.cmu.sphinx.decoder.AbstractDecoder.allocate(AbstractDecoder.java:87) at edu.cmu.sphinx.recognizer.Recognizer.allocate(Recognizer.java:168) at com.cmu.sphinx.HelloWorld.main(HelloWorld.java:42) </code></pre> <p><strong>Code:</strong></p> <pre class="lang-java prettyprint-override"><code> package com.cmu.sphinx; import edu.cmu.sphinx.frontend.util.Microphone; import edu.cmu.sphinx.recognizer.Recognizer; import edu.cmu.sphinx.result.Result; import edu.cmu.sphinx.util.props.ConfigurationManager; public class HelloWorld { public static void main(String[] args) { ConfigurationManager cm; if (args.length &gt; 0) { cm = new ConfigurationManager(args[0]); } else { cm = new ConfigurationManager(HelloWorld.class.getResource("helloworld.config.xml")); } Recognizer recognizer = (Recognizer) cm.lookup("recognizer"); recognizer.allocate(); // start the microphone or exit if the program if this is not possible Microphone microphone = (Microphone) cm.lookup("microphone"); if (!microphone.startRecording()) { System.out.println("Cannot start microphone."); recognizer.deallocate(); System.exit(1); } System.out.println("Say: (Good morning | Hello) ( Bhiksha | Evandro | Paul | Philip | Rita | Will )"); // loop the recognition until the programm exits. while (true) { System.out.println("Start speaking. Press Ctrl-C to quit.\n"); Result result = recognizer.recognize(); if (result != null) { String resultText = result.getBestFinalResultNoFiller(); System.out.println("You said: " + resultText + '\n'); } else { System.out.println("I can't hear what you said.\n"); } } } } </code></pre> <p><strong>Config File :</strong></p> <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!-- Sphinx-4 Configuration file --&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- an4 configuration file --&gt; &lt;!-- ******************************************************** --&gt; &lt;config&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- frequently tuned properties --&gt; &lt;!-- ******************************************************** --&gt; &lt;property name="logLevel" value="WARNING"/&gt; &lt;property name="absoluteBeamWidth" value="-1"/&gt; &lt;property name="relativeBeamWidth" value="1E-80"/&gt; &lt;property name="wordInsertionProbability" value="1E-36"/&gt; &lt;property name="languageWeight" value="8"/&gt; &lt;property name="frontend" value="epFrontEnd"/&gt; &lt;property name="recognizer" value="recognizer"/&gt; &lt;property name="showCreations" value="false"/&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- word recognizer configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="recognizer" type="edu.cmu.sphinx.recognizer.Recognizer"&gt; &lt;property name="decoder" value="decoder"/&gt; &lt;propertylist name="monitors"&gt; &lt;item&gt;accuracyTracker &lt;/item&gt; &lt;item&gt;speedTracker &lt;/item&gt; &lt;item&gt;memoryTracker &lt;/item&gt; &lt;/propertylist&gt; &lt;/component&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The Decoder configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="decoder" type="edu.cmu.sphinx.decoder.Decoder"&gt; &lt;property name="searchManager" value="searchManager"/&gt; &lt;/component&gt; &lt;component name="searchManager" type="edu.cmu.sphinx.decoder.search.SimpleBreadthFirstSearchManager"&gt; &lt;property name="logMath" value="logMath"/&gt; &lt;property name="linguist" value="flatLinguist"/&gt; &lt;property name="pruner" value="trivialPruner"/&gt; &lt;property name="scorer" value="threadedScorer"/&gt; &lt;property name="activeListFactory" value="activeList"/&gt; &lt;/component&gt; &lt;component name="activeList" type="edu.cmu.sphinx.decoder.search.PartitionActiveListFactory"&gt; &lt;property name="logMath" value="logMath"/&gt; &lt;property name="absoluteBeamWidth" value="${absoluteBeamWidth}"/&gt; &lt;property name="relativeBeamWidth" value="${relativeBeamWidth}"/&gt; &lt;/component&gt; &lt;component name="trivialPruner" type="edu.cmu.sphinx.decoder.pruner.SimplePruner"/&gt; &lt;component name="threadedScorer" type="edu.cmu.sphinx.decoder.scorer.ThreadedAcousticScorer"&gt; &lt;property name="frontend" value="${frontend}"/&gt; &lt;/component&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The linguist configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="flatLinguist" type="edu.cmu.sphinx.linguist.flat.FlatLinguist"&gt; &lt;property name="logMath" value="logMath"/&gt; &lt;property name="grammar" value="jsgfGrammar"/&gt; &lt;property name="acousticModel" value="wsj"/&gt; &lt;property name="wordInsertionProbability" value="${wordInsertionProbability}"/&gt; &lt;property name="languageWeight" value="${languageWeight}"/&gt; &lt;property name="unitManager" value="unitManager"/&gt; &lt;/component&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The Grammar configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="jsgfGrammar" type="edu.cmu.sphinx.jsgf.JSGFGrammar"&gt; &lt;property name="dictionary" value="dictionary"/&gt; &lt;property name="grammarLocation" value="resource:/com/cmu/sphinx/"/&gt; &lt;property name="grammarName" value="hello"/&gt; &lt;property name="logMath" value="logMath"/&gt; &lt;/component&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The Dictionary configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="dictionary" type="edu.cmu.sphinx.linguist.dictionary.FastDictionary"&gt; &lt;property name="dictionaryPath" value="resource:/edu/cmu/sphinx/model/acoustic/WSJ_8gau_13dCep_16k_40mel_130Hz_6800Hz/dict/cmudict.0.6d"/&gt; &lt;property name="fillerPath" value="resource:/edu/cmu/sphinx/model/acoustic/WSJ_8gau_13dCep_16k_40mel_130Hz_6800Hz/dict"/&gt; &lt;property name="addSilEndingPronunciation" value="false"/&gt; &lt;property name="allowMissingWords" value="false"/&gt; &lt;property name="unitManager" value="unitManager"/&gt; &lt;/component&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The acoustic model configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="wsj" type="edu.cmu.sphinx.linguist.acoustic.tiedstate.TiedStateAcousticModel"&gt; &lt;property name="loader" value="wsjLoader"/&gt; &lt;property name="unitManager" value="unitManager"/&gt; &lt;/component&gt; &lt;component name="wsjLoader" type="edu.cmu.sphinx.linguist.acoustic.tiedstate.Sphinx3Loader"&gt; &lt;property name="logMath" value="logMath"/&gt; &lt;property name="unitManager" value="unitManager"/&gt; &lt;property name="location" value="resource:/edu/cmu/sphinx/model/acoustic/WSJ_8gau_13dCep_16k_40mel_130Hz_6800Hz"/&gt; &lt;property name="modelDefinition" value="etc/WSJ_clean_13dCep_16k_40mel_130Hz_6800Hz.4000.mdef"/&gt; &lt;property name="dataLocation" value="cd_continuous_8gau/"/&gt; &lt;/component&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The unit manager configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="unitManager" type="edu.cmu.sphinx.linguist.acoustic.UnitManager"/&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The frontend configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="frontEnd" type="edu.cmu.sphinx.frontend.FrontEnd"&gt; &lt;propertylist name="pipeline"&gt; &lt;item&gt;microphone &lt;/item&gt; &lt;item&gt;preemphasizer &lt;/item&gt; &lt;item&gt;windower &lt;/item&gt; &lt;item&gt;fft &lt;/item&gt; &lt;item&gt;melFilterBank &lt;/item&gt; &lt;item&gt;dct &lt;/item&gt; &lt;item&gt;liveCMN &lt;/item&gt; &lt;item&gt;featureExtraction &lt;/item&gt; &lt;/propertylist&gt; &lt;/component&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The live frontend configuration --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="epFrontEnd" type="edu.cmu.sphinx.frontend.FrontEnd"&gt; &lt;propertylist name="pipeline"&gt; &lt;item&gt;microphone &lt;/item&gt; &lt;item&gt;dataBlocker &lt;/item&gt; &lt;item&gt;speechClassifier &lt;/item&gt; &lt;item&gt;speechMarker &lt;/item&gt; &lt;item&gt;nonSpeechDataFilter &lt;/item&gt; &lt;item&gt;preemphasizer &lt;/item&gt; &lt;item&gt;windower &lt;/item&gt; &lt;item&gt;fft &lt;/item&gt; &lt;item&gt;melFilterBank &lt;/item&gt; &lt;item&gt;dct &lt;/item&gt; &lt;item&gt;liveCMN &lt;/item&gt; &lt;item&gt;featureExtraction &lt;/item&gt; &lt;/propertylist&gt; &lt;/component&gt; &lt;!-- ******************************************************** --&gt; &lt;!-- The frontend pipelines --&gt; &lt;!-- ******************************************************** --&gt; &lt;component name="dataBlocker" type="edu.cmu.sphinx.frontend.DataBlocker"&gt; &lt;!--&lt;property name="blockSizeMs" value="10"/&gt;--&gt; &lt;/component&gt; &lt;component name="speechClassifier" type="edu.cmu.sphinx.frontend.endpoint.SpeechClassifier"&gt; &lt;property name="threshold" value="13"/&gt; &lt;/component&gt; &lt;component name="nonSpeechDataFilter" type="edu.cmu.sphinx.frontend.endpoint.NonSpeechDataFilter"/&gt; &lt;component name="speechMarker" type="edu.cmu.sphinx.frontend.endpoint.SpeechMarker" &gt; &lt;property name="speechTrailer" value="50"/&gt; &lt;/component&gt; &lt;component name="preemphasizer" type="edu.cmu.sphinx.frontend.filter.Preemphasizer"/&gt; &lt;component name="windower" type="edu.cmu.sphinx.frontend.window.RaisedCosineWindower"&gt; &lt;/component&gt; &lt;component name="fft" type="edu.cmu.sphinx.frontend.transform.DiscreteFourierTransform"&gt; &lt;/component&gt; &lt;component name="melFilterBank" type="edu.cmu.sphinx.frontend.frequencywarp.MelFrequencyFilterBank"&gt; &lt;/component&gt; &lt;component name="dct" type="edu.cmu.sphinx.frontend.transform.DiscreteCosineTransform"/&gt; &lt;component name="liveCMN" type="edu.cmu.sphinx.frontend.feature.LiveCMN"/&gt; &lt;component name="featureExtraction" type="edu.cmu.sphinx.frontend.feature.DeltasFeatureExtractor"/&gt; &lt;component name="microphone" type="edu.cmu.sphinx.frontend.util.Microphone"&gt; &lt;property name="closeBetweenUtterances" value="false"/&gt; &lt;/component&gt; &lt;!-- ******************************************************* --&gt; &lt;!-- monitors --&gt; &lt;!-- ******************************************************* --&gt; &lt;component name="accuracyTracker" type="edu.cmu.sphinx.instrumentation.BestPathAccuracyTracker"&gt; &lt;property name="recognizer" value="${recognizer}"/&gt; &lt;property name="showAlignedResults" value="false"/&gt; &lt;property name="showRawResults" value="false"/&gt; &lt;/component&gt; &lt;component name="memoryTracker" type="edu.cmu.sphinx.instrumentation.MemoryTracker"&gt; &lt;property name="recognizer" value="${recognizer}"/&gt; &lt;property name="showSummary" value="false"/&gt; &lt;property name="showDetails" value="false"/&gt; &lt;/component&gt; &lt;component name="speedTracker" type="edu.cmu.sphinx.instrumentation.SpeedTracker"&gt; &lt;property name="recognizer" value="${recognizer}"/&gt; &lt;property name="frontend" value="${frontend}"/&gt; &lt;property name="showSummary" value="true"/&gt; &lt;property name="showDetails" value="false"/&gt; &lt;/component&gt; &lt;!-- ******************************************************* --&gt; &lt;!-- Miscellaneous components --&gt; &lt;!-- ******************************************************* --&gt; &lt;component name="logMath" type="edu.cmu.sphinx.util.LogMath"&gt; &lt;property name="logBase" value="1.0001"/&gt; &lt;property name="useAddTable" value="true"/&gt; &lt;/component&gt; &lt;/config&gt; </code></pre> <p><strong>Grammar</strong></p> <pre><code>#JSGF V1.0; /** * JSGF Grammar for Hello World example */ grammar hello; public &lt;greet&gt; = (Good morning | Hello) ( Bhiksha | Evandro | Paul | Philip | Rita | Will ); </code></pre>
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