Main.java

import com.j256.ormlite.dao.Dao;
import com.j256.ormlite.dao.DaoManager;
import com.j256.ormlite.field.DatabaseField;
import com.j256.ormlite.jdbc.JdbcConnectionSource;
import com.j256.ormlite.table.DatabaseTable;
import com.j256.ormlite.table.TableUtils;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

import java.io.File;
import java.nio.file.FileSystems;
import java.util.List;

/**
 * @since 2016-07-15 04:12
 */
public class Main {
    @DatabaseTable(tableName = "a")
    public static class A {
        @DatabaseField(generatedId = true, columnName = "id")
        private long id;

        @DatabaseField(columnName = "value", persisterClass = StringPropertyPersister.class)
        private final StringProperty value;

        protected A() {
            value = new SimpleStringProperty();
        }

        public A(String token) {
            value = new SimpleStringProperty(token);
        }

        public String getValue() { return value.get(); }
        public StringProperty valueProperty() { return value; }
    }

    private static void initDB() throws Exception {
        final File path = FileSystems.getDefault().getPath(System.getProperty("user.home"), "Desktop", "test").toFile();
        final String DATABASE_URL = "jdbc:h2:" + path.getAbsolutePath();

        Class.forName("org.h2.Driver");

        connectionSource = new JdbcConnectionSource(DATABASE_URL);
        connectionSource.initialize();

        TableUtils.createTableIfNotExists(connectionSource, A.class);
    }

    private static void insertMockData() throws Exception {
        Dao<A, Integer> dao = DaoManager.createDao(connectionSource, A.class);
        dao.executeRaw("INSERT INTO a (id, value) VALUES (NULL, NULL)");
    }

    private static List<A> fetchResults() throws Exception {
        Dao<A, Integer> dao = DaoManager.createDao(connectionSource, A.class);
        return dao.queryForAll();
    }

    private static JdbcConnectionSource connectionSource;

    public static void main(String[] args) throws Exception {
        initDB();
        insertMockData();

        List<A> results = fetchResults();
        for (A result : results) {
            System.out.println(result.getValue()); // throws NullPointerException
        }
    }
}