DBCP 설정 방법 원문은 다음을 참고 하자. 
http://commons.apache.org/dbcp/configuration.html


예시>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" p:driverClassName="com.mysql.jdbc.Driver"
p:url="jdbc url"
p:username="user"
p:password="password"
p:initialSize="5" 
p:maxActive="200" 
p:minIdle="100" 
p:testOnBorrow="true"
p:testWhileIdle="true" 
p:testOnReturn="true" 
p:validationQuery="select 1" />

p:testWhileIdle="true" 는 장시간 DB 작업이 없을 경우에도 지속적으로 validationQuery를 전송하여 연결이끊기는 것을 방지한다. 

p:testOnBorrow="true" 는 커넥션 풀에서 커넥션을 가져올때 커넥션이 유효한지 검사한다.

p:testOnReturn="true" 는 커넥션 풀에 커넥션을 반환할때 커넥션이 유효한지 검사한다.


자꾸만 DB 관련 에러가 나길래 보았더니 아무래도 데이터 소스 관련 설정 문제 인거 같아 위와같이 수정하니, 아직까지 에러가 나진 않는다. 에러가 다음과 같다면 한번쯤 생각해 보시길. 

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.dao.DataAccessResourceFailureException: PreparedStatementCallback; SQL [select * from table where field=?]; Communications link failure due to underlying exception:
java.net.SocketException: Broken pipe
	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.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2637)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1554)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
	at com.mysql.jdbc.Connection.execSQL(Connection.java:3176)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1153)
	at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1266)
	at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93)
	at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:643)
	at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:586)
	at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:636)
	at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:665)
	at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:673)
	at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:716)
	at com.embian.dao.UserDao.getUser(UserDao.java:23)
	at com.embian.controller.AuthController.doAuth(AuthController.java:28)
	at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:717)
	at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:165)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:378)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:366)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:552)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
	at java.lang.Thread.run(Thread.java:619)




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