Java.sql.SQLException: Io exception: End of TNS data channel

Question

Hello folks,
Has amyone encountered this exception? If so, could you please shed some light for what might be going wrong?
Here is my confuguration:
400MB RAM
1.2GHTz processor
Win2K Pro
Oracle server 9.0.1
JDBC Thin driver (libs for 9.0.1)
Scenario:
My Java code uses Oracle Spatial to insert SDO_GEOMETRY objects into my DB model.
I have a config file where I store my connection properties, e.g.,
<DBConnection name="twatest">
<JDBCDriver>oracle.jdbc.driver.OracleDriver</JDBCDriver>
<URL>jdbc:oracle:thin:@saturn:1521:saturn</URL>
<Username>user1</Username>
<Password>twatest</Password>
</DBConnection>
We have 2 schemas defined: user1 and twatest.
The problem first occured when I switched from user1 to twatest. Consequent attempt to run the process as user user1 failed! The Java SQL statements do not use schemas (so they default, I suppose, to the default schema for that particular user, in our case being user1-->user1, twatest-->twatest).
The problem happens in the following Java class (search for "HERE" to see where exactly the problem occurs):
package com.vividsolutions.twatest;
import java.util.*;
import java.sql.*;
import oracle.sql.*;
import oracle.sdoapi.OraSpatialManager;
import oracle.sdoapi.geom.*;
import oracle.sdoapi.adapter.*;
import oracle.sdoapi.sref.*;
import com.vividsolutions.twatest.parser.*;
import com.vividsolutions.twatest.config.*;
import com.vividsolutions.twatest.model.*;
* This class is responsible for loading lakes into the SDO Oracle Spatial DB.
public class LakeLoader
static boolean initialized = false;
private static GeometryFactory gF;
private static SRManager srManager;
private static SpatialReference sref;
private static GeometryAdapter sdoAdapter;
public static void loadLake(EdgedLake slake, Connection conn) throws Exception {
com.vividsolutions.jts.geom.Envelope e = slake.getEnvelope();
if (e == null) {
System.out.println("Invalid envilope (feature ID="+slake.getFeatureId()+")! Ignoring...");
return; // ignore lake - it's invalid (no envilope)
if (!initialized) {
initialize(conn);
initialized = true;
Geometry geom;
STRUCT str;
// insert Lake
String lakeQuery = "INSERT INTO lake " +
"(lake_id, area, bounding_box, name, instantiation_date) " +
"VALUES(?,?,?,?,?)";
PreparedStatement ps = conn.prepareStatement(lakeQuery);
int lakeId = getId(Lake.ID, conn);
ps.setInt(1, lakeId);
ps.setDouble(2, Double.parseDouble(slake.getArea()));
// Creates a 2-D rectangle (special case of Polygon geometry).
geom = gF.createRectangle(e.getMinX(), e.getMinY(), e.getMaxX(), e.getMaxY());
ps.setObject(3, sdoAdapter.exportGeometry(STRUCT.class, geom));
ps.setString(4, slake.getName());
ps.setTimestamp(5, new Timestamp(new java.util.Date().getTime()));
ps.executeUpdate(); // <-- HERE I got: java.sql.SQLException: Io exception: End of TNS data channel
//ps.close();
String ringQuery = null;
int ringId = 0;
List shellEdges = slake.getShellEdges();
if (shellEdges != null && shellEdges.size() > 0) { // if there is valid shell, insert it...
// insert shell Rings
ringQuery = "INSERT INTO ring (ring_id, lake_id, type) VALUES(?,?,?)";
ps = conn.prepareStatement(ringQuery);
ringId = getId(Ring.ID, conn);
ps.setInt(1, ringId);
ps.setInt(2, lakeId);
ps.setString(3, Ring.SHELL);
ps.executeUpdate();
//ps.close();
// insert shell ring Edges
insertEdges(shellEdges, lakeId, Ring.SHELL, ringId, conn);
List holeEdges = slake.getHoleEdges();
if (holeEdges != null && holeEdges.size() > 0) { // if there are valid holes, insert them...
// insert hole Rings
ringQuery = "INSERT INTO ring (ring_id, lake_id, type) VALUES(?,?,?)";
ps = conn.prepareStatement(ringQuery);
ringId = getId(Ring.ID, conn);
ps.setInt(1, ringId);
ps.setInt(2, lakeId);
ps.setString(3, Ring.HOLE);
ps.executeUpdate();
//ps.close();
// insert hole ring Edges
insertEdges(holeEdges, lakeId, Ring.HOLE, ringId, conn);
ps.close();
private static void insertEdges(List edges, int lakeId, String ringType,
int ringId, Connection conn) throws Exception {
if (!initialized) {
initialize(conn);
initialized = true;
Geometry geom;
STRUCT str;
// insert shell ring Edges
String edgeQuery = "INSERT INTO edge " +
"(edge_id, lake_id, ring_type, ring_id, edge_sequence, shape) " +
"VALUES(?,?,?,?,?,?)";
int edge_sequence = 0;
for (Iterator it=edges.iterator(); it.hasNext(); ) {
Edge edge = (Edge)it.next();
geom = gF.createLineString(LakeFactory.edgeToArray2D(edge)); // 2-dimensional coordinates
PreparedStatement ps = conn.prepareStatement(edgeQuery);
int edgeId = getId(Edge.ID, conn);
ps.setInt(1, edgeId);
ps.setInt(2, lakeId);
ps.setString(3, ringType);
ps.setInt(4, ringId);
ps.setInt(5, edge_sequence++);
ps.setObject(6, sdoAdapter.exportGeometry(STRUCT.class, geom));
ps.executeUpdate();
ps.close();
* @param key This can be: "lake", "ring", or "edge".
* @param conn The connection to use.
* @return the unique ID corresponding to the given key.
public static int getId(String key, Connection conn) {
int id = -1;
try {
String query = "SELECT "+key+"_SEQUENCE.NEXTVAL FROM DUAL";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
id = rs.getInt(1);
stmt.close();
} catch(SQLException sqle) {
sqle.printStackTrace();
return id;
private static void initialize(Connection conn) throws Exception {
gF = OraSpatialManager.getGeometryFactory();
// Set spatial reference system in which the geometries will be created
srManager = OraSpatialManager.getSpatialReferenceManager(conn);
sref = srManager.retrieve(8307);
gF.setSpatialReference(sref);
sdoAdapter = OraSpatialManager.getGeometryAdapter("SDO", "8.1.6",
null, STRUCT.class, null, conn);
public static void main(String args[]) throws Exception
String[] xmlLakeFiles = {
"lakes101to1400.xml",
"lakes1401to10000.xml",
"lakes10001to20000.xml",
"lakes20001to30000.xml",
"lakes30001to40000.xml",
"lakes40001to50000.xml",
"lakes50001to60000.xml"
PropertyManager pm = new PropertyManager();
int numberOfLoadedLakes = 0;
try {
pm.initialize();
Map modelMap = (Map)pm.get(XMLConfigFile.MODEL_MAP);
LakeModel lakeModel = (LakeModel)modelMap.get(LREConcreteLakeModel.NAME);
Connection connection = ConnectionManager.getConnection();
lakeModel.setConnection(connection);
for (int i=0; i<xmlLakeFiles.length; i++) {
long then = System.currentTimeMillis();
System.out.println("Loading lake "+xmlLakeFiles[i]+"...");
numberOfLoadedLakes = lakeModel.loadModel(xmlLakeFiles);
long now = System.currentTimeMillis();
System.out.println("Loaded "+numberOfLoadedLakes+" lakes!");
System.out.println("Execution time: "+(now-then)/1000+" seconds!");
System.out.println("Loading lake "+xmlLakeFiles[i]+"...done!");
connection.close();
} catch(Exception e) {
e.printStackTrace();
My client class calls LakeLoader.loadLake() method in a loop to load a bunch of Lake objects into the DB. The first lake in the list is created without problems, but when the 2-nd lake is being inserted, I get an exception at the preparedStatement.executeUpdate() statement. This happens consistently.
I tried to find information on this on the net, but seems that this problem only happened when people dealt with LOBs?!
Thank you very much!
Georgi

Answer 1

Suresh -- I'd probably log a TAR with Oracle support for this question if you definitely need it resolved. Support have access to all manner of existing cases, so this may be something they have seen before.
cheers
-steve-