Re: Error org.apache.jena.tdb.transaction.TDBTransactionException: Not in a transaction

[Rob Vesse]

It's because you are trying to close the model after you've committed the 
transaction so the error message is quite correct in that you are no longer in 
a transaction at that point

Put the dataset.commit() after the model.close() line and it will work

Rob

On 02/03/2020, 16:16, "Diptendu Dutta" <dutta.dipte...@gmail.com> wrote:

    I have the following code
    
    public class JenaProcessor {
    
    static Dataset dataset = null;
    static String ns = "http://www.lke.com/lke.owl#";;
    
    static {
    try {
    dataset = TDBFactory.createDataset("C:\\Users\\Diptendu\\Desktop\\lke");
    }
    catch(Exception ex) {
    ex.printStackTrace();
    }
    }
    
    static public void clearKnowledgeGraph(String corpus_file_id) {
    dataset.begin(ReadWrite.WRITE) ;
    Model model = null;
    try {
    model = dataset.getNamedModel(corpus_file_id);
    model.removeAll();
    dataset.commit();
    if( model != null ) model.close();
    }
    catch(Exception ex) {
    ex.printStackTrace();
    }
    finally {
           dataset.end();
    }
    }
    }
    
    model.close() is causing the error TDBTransactionException: Not in a
    transaction
    
    org.apache.jena.tdb.transaction.TDBTransactionException: Not in a
    transaction
    at
    
org.apache.jena.tdb.transaction.DatasetGraphTransaction.get(DatasetGraphTransaction.java:138)
    at
    
org.apache.jena.tdb.transaction.DatasetGraphTransaction.getDatasetGraphToQuery(DatasetGraphTransaction.java:84)
    at
    
org.apache.jena.tdb.store.GraphTxnTDB.getDatasetGraphTDB(GraphTxnTDB.java:51)
    at org.apache.jena.tdb.store.GraphTDB.sync(GraphTDB.java:128)
    at org.apache.jena.tdb.store.GraphTDB.close(GraphTDB.java:133)
    at org.apache.jena.rdf.model.impl.ModelCom.close(ModelCom.java:1494)
    at knowledgegraph.JenaProcessor.clearKnowledgeGraph(JenaProcessor.java:120)
    
    What do I need to do?
    
    Regards,
    
    Diptendu Dutta