Unsafe code in OpenRefine

gistfile1.java

import com.google.refine.expr.CellTuple;
import com.google.refine.expr.Evaluable;
import com.google.refine.jython.JythonEvaluable;
import com.google.refine.model.Cell;
import com.google.refine.model.Project;
import com.google.refine.model.Row;
import org.testng.Assert;
import org.testng.annotations.Test;

import java.util.Properties;

/**
 * @author mgalushka
 */
public class JythonThreadUnsafe {

    @Test
    public void testJythonContextSafety() {
        Properties props = new Properties();

        Project project = new Project();

        Row row = new Row(2);
        row.setCell(0, new Cell("one", null));
        row.setCell(1, new Cell("1", null));

        props.put("columnName", "_ - value");
        props.put("true", "true");
        props.put("rowIndex", "0");
        props.put("value", 1);
        props.put("project", project);
        props.put("call", "some cell");
        props.put("false", "false");
        props.put("cells", new CellTuple(project, row));
        props.put("PI", "3.141592653589793");
        props.put("row", row);

        // Evaluate expression first time
        Evaluable eval1 = new JythonEvaluable("a = value\nreturn a * 2");
        Long value1 = (Long) eval1.evaluate(props);

        // Just create some other(!!) non-related evaluable...
        new JythonEvaluable("a = value\nreturn a * 3");

        // Repeat same evaluation - obviously the result MUST be the same
        Long value2 = (Long) eval1.evaluate(props);

        // Check if 1st value == 2nd value
        Assert.assertEquals(value1, value2);
    }

}