Oddly enough these are probably best explained in the commons-pool
project (http://jakarta.apache.org/commons/pool) which was a spin-off
of DBCP.
maxWait is the maximum amount of time to wait for an object if the pool
is full and there are no more objects (connections) to borrow.
Essentially you're making a thread wait for an object to return to the
pool from another borrow.
timeBetweenEvictionRunsMillis is the number of milliseconds to wait
between runs of a background thread that tests all the object in the
pool, removing those that aren't valid anymore. In a connection pool it
runs the validationQuery, removing the connection if the query fails.
You can look at this page for an official explanation:
http://commons.apache.org/pool/api-1.3/org/apache/commons/pool/impl/GenericObjectPool.html
--David
[EMAIL PROTECTED] wrote:
who can explain me the use of parameters: maxWait and
timeBetweenEvictionRunsMillis, maybe with an example please? I read the api of
it but can't understand the use of them... thanks
On 8/12/07, fusion35 <[EMAIL PROTECTED]> wrote:
context.xml :
<?xml version="1.0" encoding="UTF-8"?>
<!-- The contents of this file will be loaded for each web application -->
<Context path="/PAF" reloadable="true" crossContext="true">
<Resource auth="Container" defaultAutoCommit="false"
driverClassName="com.mysql.jdbc.Driver" maxActive="0" maxWait="1000"
name="jdbc/PAFDB" password="root" timeBetweenEvictionRunsMillis="60000"
type="javax.sql.DataSource" url="jdbc:mysql://localhost:3306/pafdb"
username="root"/>
</Context>
The log of error is as under :
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection,
pool error Timeout waiting for idle object
at
org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:104)
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at bsh.Reflect.invokeMethod(Unknown Source)
at bsh.Reflect.invokeObjectMethod(Unknown Source)
at bsh.Name.invokeMethod(Unknown Source)
at bsh.BSHMethodInvocation.eval(Unknown Source)
at bsh.BSHPrimaryExpression.eval(Unknown Source)
at bsh.BSHPrimaryExpression.eval(Unknown Source)
at bsh.BSHAssignment.eval(Unknown Source)
at bsh.BSHBlock.evalBlock(Unknown Source)
at bsh.BSHBlock.eval(Unknown Source)
at bsh.BSHBlock.eval(Unknown Source)
at bsh.BSHTryStatement.eval(Unknown Source)
at bsh.BSHBlock.evalBlock(Unknown Source)
at bsh.BSHBlock.eval(Unknown Source)
at bsh.BshMethod.invokeImpl(Unknown Source)
at bsh.BshMethod.invoke(Unknown Source)
at bsh.BshMethod.invoke(Unknown Source)
at bsh.Name.invokeLocalMethod(Unknown Source)
at bsh.Name.invokeMethod(Unknown Source)
at bsh.BSHMethodInvocation.eval(Unknown Source)
at bsh.BSHPrimaryExpression.eval(Unknown Source)
at bsh.BSHPrimaryExpression.eval(Unknown Source)
at bsh.Interpreter.eval(Unknown Source)
at bsh.Interpreter.eval(Unknown Source)
at
org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:80)
at
org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:283)
at org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:727)
at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:170)
at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138)
at
org.zkoss.zk.ui.impl.EventProcessingThreadImpl.process0(EventProcessingThreadImpl.java:452)
at
org.zkoss.zk.ui.impl.EventProcessingThreadImpl.run(EventProcessingThreadImpl.java:370)
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:825)
at
org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
... 35 more
Data Source : [EMAIL PROTECTED]
Conn before : null
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection,
pool error Timeout waiting for idle object
at
org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:104)
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at bsh.Reflect.invokeMethod(Unknown Source)
at bsh.Reflect.invokeObjectMethod(Unknown Source)
at bsh.Name.invokeMethod(Unknown Source)
at bsh.BSHMethodInvocation.eval(Unknown Source)
at bsh.BSHPrimaryExpression.eval(Unknown Source)
at bsh.BSHPrimaryExpression.eval(Unknown Source)
at bsh.BSHAssignment.eval(Unknown Source)
at bsh.BSHBlock.evalBlock(Unknown Source)
at bsh.BSHBlock.eval(Unknown Source)
at bsh.BSHBlock.eval(Unknown Source)
at bsh.BSHTryStatement.eval(Unknown Source)
at bsh.BSHBlock.evalBlock(Unknown Source)
at bsh.BSHBlock.eval(Unknown Source)
at bsh.BshMethod.invokeImpl(Unknown Source)
at bsh.BshMethod.invoke(Unknown Source)
at bsh.BshMethod.invoke(Unknown Source)
at bsh.Name.invokeLocalMethod(Unknown Source)
at bsh.Name.invokeMethod(Unknown Source)
at bsh.BSHMethodInvocation.eval(Unknown Source)
at bsh.BSHPrimaryExpression.eval(Unknown Source)
at bsh.BSHPrimaryExpression.eval(Unknown Source)
at bsh.Interpreter.eval(Unknown Source)
at bsh.Interpreter.eval(Unknown Source)
at
org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:80)
at
org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:283)
at org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:727)
at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:170)
at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138)
at
org.zkoss.zk.ui.impl.EventProcessingThreadImpl.process0(EventProcessingThreadImpl.java:452)
at
org.zkoss.zk.ui.impl.EventProcessingThreadImpl.run(EventProcessingThreadImpl.java:370)
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:825)
at
org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
... 35 more
--
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