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https://issues.apache.org/jira/browse/DERBY-3243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12563767#action_12563767
]
Kathey Marsden commented on DERBY-3243:
---------------------------------------
So we do send and receive a 4 byte int, but we have this check in the
locator(int column) method of NetCursor which says the highest bit will be set
if it is not a locator, but it is not the highest bit that we are checking, so
we end up using only two bytes for our locator.
Perhaps in the case of lob value we are reading the extended length indicator
which will be 0x800x. I'm not sure if that's what's going on though. I did
try against a 10.2 server to see if the check is necessary for sending lobs by
value and found that indeed it is.
Removing the check in 10.4 and just returning the locator gets us through the
repro.
It seems like maybe instead of this check we should be able to tell by the drda
type whether we have a locator or a value.
private int locator(int column)
{
int locator = get_INTEGER(column);
// If Lob value was sent instead of locator, highest bit will be set
// Zero is not a valid locator, it indicates a zero length value
if (((locator & 0x8000) == 0x8000) || (locator == 0)) {
return Lob.INVALID_LOCATOR;
} else {
return locator;
}
}
> (jdbc net client) exception during normal iteration through "ResultSet" of
> "select * from t"
> --------------------------------------------------------------------------------------------
>
> Key: DERBY-3243
> URL: https://issues.apache.org/jira/browse/DERBY-3243
> Project: Derby
> Issue Type: Bug
> Components: JDBC
> Affects Versions: 10.3.2.1
> Environment: ------------------ Java Information ------------------
> Java Version: 1.4.2_03
> Java Vendor: Sun Microsystems Inc.
> Java home: C:\Programme\Java\j2re1.4.2_03
> Java classpath: derbyclient.jar
> OS name: Windows XP
> OS architecture: x86
> OS version: 5.1
> Java user name: cbdqok
> Java user home: C:\Dokumente und Einstellungen\cbdqok
> Java user dir: D:\users\cbdqok\privat\osj\lib_derby_net\lib
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.4
> --------- Derby Information --------
> JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
> [D:\users\cbdqok\privat\osj\lib_derby_net\lib\derbyclient.jar] 10.3.1.4 -
> (561794)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> ------------------------------------------------------
> Reporter: Oliver Seidel
> Priority: Critical
> Attachments: derby-3243_fix_double_hashmap_entry_diff.txt,
> derby-3243_fix_double_hashmap_entry_diff2.txt,
> derby-3243_fix_double_hashmap_entry_stat.txt
>
>
> Thanks again to the DERBY developers.
> For my convenience I use the client/server variant of DERBY. This is where
> the error occurs. I have temporarily alleviated the problem for my case by
> using the embedded version.
> I'm forced to use outlook and have built a program which siphons the messages
> into a derby database (phase 1 -- table has two varchar fields and a clob).
> When reading them back (phase 2 -- simple select of all records in no
> particular order, all 3 attributes), it has developed an exception. This is
> a result of data volume. I have reduced the problem to a single
> demonstration program.
> This behaviour, and the fact that the error is not a "DERBY Exception", but a
> proper exception coming back from the JDBC call, leads me to the diagnosis
> that it is a derby network client jdbc problem.
> The problem has been reproduced once by Bryan Pendleton:
> http://www.nabble.com/IndexOutOfBoundsException-t4926228.html
> I'll try to attach the code "error.java"; it can also be found on:
> http://www.os10000.net/error.java
> Please use as follows:
> javac -classpath derby.jar:derbynet.jar error.java
> java -cp .:derby.jar:derbynet.jar error
> It will create a directory "test_db" and fill it with approx 120mb data.
> Then you will observe the failure.
> /* -*- Mode:Java; c-basic-offset:8 -*- */
> //
> --------------------------------------------------------------------------------
> public class error {
> //
> ------------------------------------------------------------------------
> public static final int port = 1527;
> public static final String host = "127.0.0.1";
> //
> ------------------------------------------------------------------------
> public static void log(String x) { System.out.println(x); };
> //
> ------------------------------------------------------------------------
> public static void log_stacktrace(Exception e) {
> java.io.StringWriter sw = new java.io.StringWriter();
> java.io.PrintWriter pw = new java.io.PrintWriter(sw);
> e.printStackTrace(pw);
> log(sw.toString());
> };
> //
> ------------------------------------------------------------------------
> public static void start_server() {
> try {
> org.apache.derby.drda.NetworkServerControl server =
> new
> org.apache.derby.drda.NetworkServerControl(java.net.InetAddress.getByName(host),port);
> server.start(null);
> try { java.lang.Thread.sleep(5000); } catch (Exception
> e) { };
> log("started DERBY on host "+host+" port
> "+Integer.toString(port)+".");
> } catch (Exception e) {
> log_stacktrace(e);
> };
> };
> //
> ------------------------------------------------------------------------
> public static java.sql.Connection con()
> throws java.sql.SQLException, java.lang.ClassNotFoundException {
> Class.forName("org.apache.derby.jdbc.ClientDriver");
> String x_dbse = "test_db";
> String x_user = ";user=os10000";
> String x_pass = ";password=ding";
> String x_crte = ";create=true";
> String x_msgs = ";retrieveMessagesFromServerOnGetMessage=true";
> String connect =
> "jdbc:derby://"+host+":"+port+"/"+x_dbse+x_user+x_crte+x_msgs;
> return java.sql.DriverManager.getConnection(connect);
> };
> //
> ----------------------------------------------------------------------
> public static String getclob(java.sql.Clob b) {
> java.io.CharArrayWriter caw = new java.io.CharArrayWriter();
> try {
> java.io.Reader rd = b.getCharacterStream();
> char cb[] = new char[4096];
> int off=0, bts = rd.read(cb);
> while (bts>0) { caw.write(cb,off,bts); off+=bts;
> bts=rd.read(cb); };
> rd.close();
> } catch(Exception e) {};
> String res = caw.toString();
> caw.close();
> return res;
> };
> //
> ----------------------------------------------------------------------
> public static class myclob implements java.sql.Clob {
> String v;
> public myclob(String z) { v=z; };
> public java.io.InputStream getAsciiStream() { return new
> java.io.ByteArrayInputStream(v.getBytes()); };
> public java.io.Reader getCharacterStream() { return new
> java.io.CharArrayReader(v.toCharArray()); };
> public String getSubString(long pos, int length) { return
> v.substring((int)pos,(int)(pos+length)); };
> public long length() { return v.length(); };
> public long position(java.sql.Clob pattern, long start) {
> return 0; };
> public long position(String pattern, long start) { return 0; };
> public java.io.OutputStream setAsciiStream(long pos) {
> new java.sql.SQLException("setAsciiStream not
> implemented."); return null; };
> public java.io.Writer setCharacterStream(long pos) {
> new java.sql.SQLException("setCharacterStream not
> implemented."); return null; };
> public int setString(long pos, String s) {
> new java.sql.SQLException("setString not
> implemented."); return -1; };
> public int setString(long pos, String s, int offset, int len) {
> new java.sql.SQLException("setString not
> implemented."); return -1; };
> public void truncate(long len) {
> new java.sql.SQLException("truncate not implemented.");
> };
> };
> public static java.sql.Clob putclob(String x) { return new myclob(x); };
>
> //
> ------------------------------------------------------------------------
> public static String getLob(java.sql.ResultSet rs, int arg)
> throws java.sql.SQLException { return getclob(rs.getClob(arg));
> };
> public static void setLob(java.sql.PreparedStatement ps, int arg,
> String val)
> throws java.sql.SQLException { ps.setClob(arg,putclob(val)); };
> //
> ------------------------------------------------------------------------
> public static String clean_string(String x) {
> return
> x.replaceAll("[\0\r\\\\]","").replaceAll("'","\\\"").replaceAll(",+",",");
> };
> //
> ------------------------------------------------------------------------
> public static String make_string(int digits) {
> double dl = (Math.random()) *
> (Math.pow(10.0,digits*Math.random()));
> int len = (int) dl;
> byte buf[] = new byte[len];
> while (len>0) {
> double db = 256*Math.random();
> buf[--len] = (byte)db;
> };
> return clean_string(new String(buf));
> };
> //
> ------------------------------------------------------------------------
> public static void update(java.sql.Connection c, String cmd)
> throws java.sql.SQLException {
> c.createStatement().execute(cmd);
> };
> //
> ------------------------------------------------------------------------
> public static final int entries=100000;
> public static void fill_db(java.sql.Connection c)
> throws java.sql.SQLException {
> try { update(c,"drop table mail_raw"); } catch (Exception e) {};
> try { update(c,"create table mail_raw ( msg varchar(999), att
> varchar(100), val clob )"); }
> catch (Exception e) { log_stacktrace(e); };
> java.sql.PreparedStatement pstmt = null;
> try { pstmt = c.prepareStatement("insert into mail_raw values (
> ?, ?, ? )"); }
> catch (Exception e) { log_stacktrace(e); };
> for (int i=0; i<entries; i++) {
> pstmt.setString(1,make_string(3));
> pstmt.setString(2,"5 body");
> setLob(pstmt,3,make_string(4));
> pstmt.executeUpdate();
> if (i%100==0) log("step "+i+"/"+entries);
> };
> };
> //
> ------------------------------------------------------------------------
> public static void dump_db(java.sql.Connection c)
> throws java.sql.SQLException {
> log("performing dump.");
> java.sql.ResultSet rs =
> c.createStatement().executeQuery("select * from mail_raw");
> while (rs.next()) {
> String msg = rs.getString(1);
> String att = rs.getString(2);
> String val = getLob(rs,3);
> };
> };
> //
> ------------------------------------------------------------------------
> public static void main(String args[]) {
> start_server();
> try {
> java.sql.Connection c = con();
> fill_db(c);
> dump_db(c);
> } catch (Exception e) { log_stacktrace(e); };
> };
> //
> ------------------------------------------------------------------------
> };
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