Warum löst dieser Code, wie ein Shapefile mit geotools liest, diese Ausnahme aus?

Question

Ich lese Attribute aus einem Shapefile mit Geotools 10.1. Ich verstehe nicht, warum eine Ausnahme nach Drucken aller Features Attribut ausgelöst.

Dies ist der Beispielcode:

import java.io.File; 
import java.io.IOException; 
import java.io.Serializable; 
import java.util.HashMap; 
import java.util.Map; 

import org.geotools.data.DataStore; 
import org.geotools.data.DataStoreFinder; 
import org.geotools.data.FeatureSource; 
import org.geotools.feature.FeatureCollection; 
import org.geotools.feature.FeatureIterator; 
import org.opengis.feature.simple.SimpleFeature; 

public class LayerBusinessTest { 


public static void main(String[] args) throws IOException { 

    File file = new File("../../setup/test/shp/sscc/SSCC2010_WGS84.shp"); 
    Map<String, Serializable> map = new HashMap<>(); 
    map.put("url", file.toURI().toURL()); 

    DataStore dataStore = DataStoreFinder.getDataStore(map); 
    String typeName = dataStore.getTypeNames()[0]; 

    FeatureSource source = dataStore.getFeatureSource(typeName); 

    FeatureCollection collection = source.getFeatures(); 
    FeatureIterator<SimpleFeature> results = collection.features(); 
    try { 
     while (results.hasNext()) { 
      SimpleFeature feature = (SimpleFeature) results.next(); 
      String code = feature.getAttribute("Codigo_SSC").toString(); 
      System.out.println(code); 
     } 
    } finally { 
     results.close(); 
    } 

} 

}

Ausnahme:

Exception in thread "main" java.lang.IllegalArgumentException: Expected requestor org.geotools.data.shapefile.dbf.DbaseFileReader@2ac9b619 to have locked the url but it does not hold the lock for the URL 
    at org.geotools.data.shapefile.files.ShpFiles.unlockRead(ShpFiles.java:429) 
    at org.geotools.data.shapefile.files.FileChannelDecorator.implCloseChannel(FileChannelDecorator.java:149) 
    at java.nio.channels.spi.AbstractInterruptibleChannel.close(AbstractInterruptibleChannel.java:115) 
    at org.geotools.data.shapefile.dbf.DbaseFileReader.close(DbaseFileReader.java:279) 
    at org.geotools.data.shapefile.ShapefileFeatureReader.close(ShapefileFeatureReader.java:248) 
    at org.geotools.data.store.ContentFeatureCollection$WrappingFeatureIterator.close(ContentFeatureCollection.java:154) 
    at LayerBusinessTest.main(LayerBusinessTest.java:39) 

Answer 1

Es ist dataStore.dispose(); vor Abfahrt erforderlich auszuführen.