JTDS

Question

我正在使用 jTDS 是用于 Microsoft SQL Server (2012) 的开源 100% 纯 Java (type 4) JDBC 3.0 驱动程序。

Tomcat 7 - 我有下面的连接池配置

<?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>

有时，我会遇到以下异常 - 无法从 sql 服务器获得连接。不知道是什么原因？

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

大概检查以下条件：

检查SQL语句执行前socket或资源池端口是否未关闭
检查连接是否未被任何其他进程重置
检查端口是否未被其他进程或其他执行使用或锁定。
检查连接池中是否有可用端口。

Answer 2

我终于找到了这个错误的原因。这是因为，在重新启动数据库服务器后，tomcat 服务器没有重新启动（因此即使在重新启动数据库时它仍然存在）。因此池中的连接变得无效。因此，当网页第一次尝试创建数据库连接时会提示此错误，并且在下一次尝试时它将从连接池中获取有效连接，因为应用程序服务器识别其连接无效，因此它会获取新连接池。

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

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

java

sql-server

sql-server-2012