Error when using StanfordCoreNLP

Question

I'm trying to use Stanford CoreNLP as a library in my java program. I use IntelliJ as the IDE. I was trying to test the library, so I wrote this code:

import edu.stanford.nlp.pipeline.StanfordCoreNLP;

import java.util.Properties;

/**
 * Created by Benjamin on 15/5/4.
 */
public class SentimentAnaTest {
    public static void main(String[] args) {
        Properties props = new Properties();
        props.setProperty("annotators", "tokenize, ssplit, pos, lemma, ner, parse, dcoref");
        StanfordCoreNLP pipeline = new StanfordCoreNLP(props);
    }
}

and it shows the error like this:

Adding annotator tokenize
TokenizerAnnotator: No tokenizer type provided. Defaulting to PTBTokenizer.
Adding annotator ssplit
Adding annotator pos
Exception in thread "main" java.lang.RuntimeException: edu.stanford.nlp.io.RuntimeIOException: Unrecoverable error while loading a tagger model
    at edu.stanford.nlp.pipeline.AnnotatorFactories$4.create(AnnotatorFactories.java:292)
    at edu.stanford.nlp.pipeline.AnnotatorPool.get(AnnotatorPool.java:85)
    at edu.stanford.nlp.pipeline.StanfordCoreNLP.construct(StanfordCoreNLP.java:289)
    at edu.stanford.nlp.pipeline.StanfordCoreNLP.<init>(StanfordCoreNLP.java:126)
    at edu.stanford.nlp.pipeline.StanfordCoreNLP.<init>(StanfordCoreNLP.java:122)
    at SentimentAnaTest.main(SentimentAnaTest.java:12)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: edu.stanford.nlp.io.RuntimeIOException: Unrecoverable error while loading a tagger model
    at edu.stanford.nlp.tagger.maxent.MaxentTagger.readModelAndInit(MaxentTagger.java:770)
    at edu.stanford.nlp.tagger.maxent.MaxentTagger.<init>(MaxentTagger.java:298)
    at edu.stanford.nlp.tagger.maxent.MaxentTagger.<init>(MaxentTagger.java:263)
    at edu.stanford.nlp.pipeline.POSTaggerAnnotator.loadModel(POSTaggerAnnotator.java:97)
    at edu.stanford.nlp.pipeline.POSTaggerAnnotator.<init>(POSTaggerAnnotator.java:77)
    at edu.stanford.nlp.pipeline.AnnotatorImplementations.posTagger(AnnotatorImplementations.java:59)
    at edu.stanford.nlp.pipeline.AnnotatorFactories$4.create(AnnotatorFactories.java:290)
    ... 10 more
Caused by: java.io.IOException: Unable to resolve "edu/stanford/nlp/models/pos-tagger/english-left3words/english-left3words-distsim.tagger" as either class path, filename or URL
    at edu.stanford.nlp.io.IOUtils.getInputStreamFromURLOrClasspathOrFileSystem(IOUtils.java:481)
    at edu.stanford.nlp.tagger.maxent.MaxentTagger.readModelAndInit(MaxentTagger.java:765)
    ... 16 more

I read a solution here but couldn't figure out what the problem was, because I added the library from the Maven Central Repository which already included the "stanford-corenlp-3.5.2-models.jar".

From the error message it seemed like the program was trying to load a file from edu/stanford/nlp/models/pos-tagger/english-left3words/english-left3words-distsim.tagger so I download the tagger file from here and put it into /edu/stanford/nlp/models/pos-tagger/english-left3words/english-left3words-distsim.tagger. However it still didn't work.

Can someone tell me whats this error is about and help me to solve it? Thank you!

Answer 1

I had the same problem. Fixed using:

<dependencies>
<dependency>
    <groupId>edu.stanford.nlp</groupId>
    <artifactId>stanford-corenlp</artifactId>
    <version>3.5.2</version>
</dependency>
<dependency>
    <groupId>edu.stanford.nlp</groupId>
    <artifactId>stanford-corenlp</artifactId>
    <version>3.5.2</version>
    <classifier>models</classifier>
</dependency>
</dependencies>

or for SBT:

"edu.stanford.nlp" % "stanford-corenlp" % "3.5.2",
"edu.stanford.nlp" % "stanford-corenlp" % "3.5.2" classifier "models",

Answer 2

The tagger file has to be placed into your project root.

project
-- src --> SentimentAnaTest
-- english-left3words/english-left3words-distsim.tagger

Tested in Eclipse project.