JDBC deadlock on DriverSapDB.connect

Hi,
Today i get a JDBC dealock that i must shutdown and restart my application, i get the follow stack when investiganting the problem:
"http-80-exec-15" daemon prio=10 tid=0x0000000056fa8800 nid=0x4860 runnable [0x000000004292f000..0x0000000042930c90]
   java.lang.Thread.State: RUNNABLE
     at java.net.SocketInputStream.socketRead0(Native Method)
     at java.net.SocketInputStream.read(SocketInputStream.java:129)
     at com.sap.dbtech.rte.comm.BasicSocketComm.receiveData(BasicSocketComm.java:577)
     at com.sap.dbtech.rte.comm.BasicSocketComm.receive(BasicSocketComm.java:666)
     at com.sap.dbtech.rte.comm.JdbcCommunication.execute(JdbcCommunication.java:41)
     at com.sap.dbtech.jdbc.ConnectionSapDB.execute(ConnectionSapDB.java:536)
     - locked <0x00002aaafff16398> (a com.sap.dbtech.jdbc.ConnectionSapDB)
     at com.sap.dbtech.jdbc.ConnectionSapDB.execute(ConnectionSapDB.java:461)
     at com.sap.dbtech.jdbc.ConnectionSapDB.doConnect(ConnectionSapDB.java:398)
     at com.sap.dbtech.jdbc.ConnectionSapDB.<init>(ConnectionSapDB.java:109)
     at com.sap.dbtech.jdbc.DriverSapDB.connect(DriverSapDB.java:222)
     - locked <0x00002aaac64a7f48> (a com.sap.dbtech.jdbc.DriverSapDB)
     at java.sql.DriverManager.getConnection(DriverManager.java:582)
     at java.sql.DriverManager.getConnection(DriverManager.java:185)
"http-80-exec-122" daemon prio=10 tid=0x0000000059065800 nid=0x4bac waiting for monitor entry [0x000000004a6ac000..0x000000004a6add90]
   java.lang.Thread.State: BLOCKED (on object monitor)
     at com.sap.dbtech.jdbc.DriverSapDB.connect(DriverSapDB.java:197)
     - waiting to lock <0x00002aaac64a7f48> (a com.sap.dbtech.jdbc.DriverSapDB)
     at com.sap.dbtech.jdbcext.DataSourceSapDBBase.openPhysicalConnection(DataSourceSapDBBase.java:333)
     at com.sap.dbtech.jdbcext.DataSourceSapDB.getConnection(DataSourceSapDB.java:40)
This is only one thread have many more but with same Stack.
JDBC version is 7.6.03.07
JVM version is:
java version "1.6.0_06"
Java(TM) SE Runtime Environment (build 1.6.0_06-b02)
Java HotSpot(TM) 64-Bit Server VM (build 10.0-b22, mixed mode)
any idea how to avoid this?
KR Clóvis.
Edited by: Clovis Wichoski on May 28, 2008 1:30 PM

Hi,
i found some interesting message from Alexander Schröder in follow archive:
http://www.mail-archive.com/maxdb AT lists.mysql.com/msg03533.html
cut:
Hello,
you might want to look at LOCKSTATISTICS whether there are row locks
and the DELETE wants to have a tab exclusive lock on that table.
If a lot of rows needs to be locked, MaxDB may decided to lock
the complete table, which of course may wait if there are other
row locks by other sessions on that table. You may increase the
MAXLOCKS database parameter, to increase the number of possible
individual row locks.
Regards
Alexander Schröder
SAP DB, SAP Labs Berlin
that post appears to have the same scenario that i have here, then there is a way to log when a table is locked by complete? and because what if just one table is locked, no other JDBC connection can be made? for example, to query another table? appears that we have a "Connection lock" and dont a "Table lock".
anyone can help with this?
best regards.
Clóvis

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Hi. Remove the semicolon from your SQL string:     stmt.executeUpdate("CREATE TABLE Authorr(col1 CHAR(10))");Joe

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We are pretty sure this has to be a problem with JDBC running on a disk-less machine. We have some ODBC applications that run fine on these disk-less machines and we can run the java applications fine on a machine with a disk that has the same architecture as the one without.
We have tried to turn on JDBC logging by using the ojdbc5_g.jar and setting oracle.jdbc.Trace=true, but have had no success, we have also tried doing it programatically by setting DriverManager.setLogger() and setting it to System.out, but haven't seen anything new.
We are using the oracle:thin driver and are running on red hat 5.0 with Java 1.5 and a 64 bit architecture, against Oracle 11g . Does anyone have any thoughts on what is going on?
Edited by: user538801 on Aug 11, 2009 12:15 PM

We found it, it was a pretty obscure issue. The JDBC getConnection() method makes a call to the random number generator. This call hangs due to the system entropy being 0 on the disk-less blades, when the JVM starts up it waits on the first call to the random number generator for the system entropy to get above a certain threshold which it doesn't do.
The solution was to use a different random number generator, by default the JVM uses/dev/random which requires sufficient entropy to seed the first call, we changed it to /dev/urandom by setting java.security.egd which is slightly less random, but does not hang on the first call.

[b]Config JDBC for JSP to connect to OracleDB[/b]

I use iWS6.0 and JDK1.2 to enable JSP.
To use JDBC Driver to connect to OracleDB, I simply set CLASSPATH to the location of classes12.zip, and I have tested in java command-line, it worked fine.
To let JSP work with JDBC, I edit file jvm12.conf so that the jvm.classpath to location of classes12.zip, but it doesn't work.
Could someone guide me to the solution, or some document to read.

Class.forName("COM.ibm.db2.jdbc.app.DB2Driver");Modify these lines as this, checking whtr the driver is available in the correspopnding package...
Class.forName("COM.ibm.db2.jdbc.net.DB2Driver");
i suppose that this works out well.

JDBC deadlock on DriverSapDB.connect

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