Dlaczego ten kod jak odczytać plik kształtu za pomocą geotools zgłasza ten wyjątek?

Question

Czytam atrybuty z pliku kształtu za pomocą geotools 10.1. Nie rozumiem, dlaczego zgłasza wyjątek po wydrukowaniu wszystkich atrybutów funkcji.

To jest przykładowy kod:

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(); 
    } 

} 

}

Wyjątek:

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

Jest to konieczne, wykonać dataStore.dispose(); przed wyjściem.