JTDS - java.sql.SQLException: I/O Error: Connection reset by peer: socket write error

Question

I'm using jTDS is an open source 100% pure Java (type 4) JDBC 3.0 driver for Microsoft SQL Server (2012).

Tomcat 7 - I have Connection Pool configuration below

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/webapp">
    <Resource name="jdbc/dbname" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000" removeAbandoned="true" removeAbandonedTimeout="60"
               username="abc" password="abc" driverClassName="net.sourceforge.jtds.jdbc.Driver"
               url="jdbc:jtds:sqlserver://localhost;databaseName=dbname;SelectMethod=Cursor"/>
</Context>

Sometimes, I'm getting the below exception - Unable to get an connection from sql server. I don't know the reason why?

java.sql.SQLException: I/O Error: Connection reset by peer: socket write error at net.sourceforge.jtds.jdbc.TdsCore.executeSQL(TdsCore.java:1052) at net.sourceforge.jtds.jdbc.JtdsStatement.executeSQLQuery(JtdsStatement.java:465) at net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeQuery(JtdsPreparedStatement.java:777) at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93) at at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662) Caused by: java.net.SocketException: Connection reset by peer: socket write error at java.net.SocketOutputStream.socketWrite0(Native Method) at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92) at java.net.SocketOutputStream.write(SocketOutputStream.java:136) at java.io.DataOutputStream.write(DataOutputStream.java:90) at net.sourceforge.jtds.jdbc.SharedSocket.sendNetPacket(SharedSocket.java:671) at net.sourceforge.jtds.jdbc.RequestStream.putPacket(RequestStream.java:560) at net.sourceforge.jtds.jdbc.RequestStream.flush(RequestStream.java:508) at net.sourceforge.jtds.jdbc.TdsCore.executeSQL(TdsCore.java:1039) ... 8 more 17-Apr-2015 12:00:54 ERROR PatientProcessor:614 - SQLException java.sql.SQLException: Already closed. at org.apache.tomcat.dbcp.dbcp.PoolableConnection.close(PoolableConnection.java:84) at org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:181) at at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662

Answer 1

Probably Check the following conditions:

1. Check whether the socket or the resource pool port is not closed before the execution of the SQL statement.
2. Check whether connection is not reset by any other process
3. Check whether the port is not being used by or locked other process or other execution.
4. Check whether the there is any available port in the pool of connections.