Sorry Eric,
i would not confuse you :)
if have different functions to execute PreparedStatements
I am using oc4j and the struts config was the easiest and quickest way to provide a
clean access to the
database i thought. Trying your configuration i have to adopt my source to access the
datasource via
jndi, because the struts config can not handle the DataSourceFactory. :(
Okay, i will try it and keep you informed. Thank you anyway for your help and your
informations
Regards Mirko
Mit freundlichen Grüßen
Mirko Wolf
-----------------------------------------------------------------------------------------------------------------------------------------
panta rhei systems gmbh
budapester straße 31
10787 berlin
tel +49.30.26 01-14 17
fax +49.30.26 01-414 13
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Well, I am a little confused that the first piece of code you included
invokes an executeStatement method that takes a String parameter, but
the second piece of code shows an executeStatement method that takes a
List parameter. But, I assume there is another, similar,
executeStatement method, that takes a String parameter.
Your code looks good to me, I should have looked at it more closely
before I responded.
Here is the data source configuration in my Tomcat xml config file
(${catalina_home}/conf/Catalina/localhost/MyWar.xml):
<Resource name="jdbc/OracleDB" auth="container" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/OracleDB">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@myhost:1521:mydbinstance</value>
</parameter>
<parameter>
<name>username</name>
<value>eweber</value>
</parameter>
<parameter>
<name>password</name>
<value>changeit</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>20</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>10</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>-1</value>
</parameter>
</ResourceParams>
This is with Oracle 10. I don't use the struts data source configuration
but rather use Tomcat's and just do a JNDI lookup on the DataSource at
startup, caching the DataSource reference to use from then on. But
perhaps some of those other parameters that you configure could lead to
a problem (I have no evidence of this).
http://www.junlu.com/msg/46934.html
http://www.cryer.co.uk/brian/oracle/SYMdilu.htm#RemedySharedPoolExhausted
Maybe try my param set, maybe try my version of DBCP if it is different
from yours.
Erik
PANTA-RHEI WOLF wrote:
>Hi there, i have a very strange behaviour using DBCP. I have a small set of JSPs
>talking to an oracledatabase. after a while
>it looks if my application hang. 2 till 3 minutes later it seems to work fine again.
>When i have a look in my logfile, i can see
>the following exception. I do not know what happen exactly, can anyone help me please?
>
>Below you is the Exception, the datasource-config and a snippet from my application.
>
>Is it correct closing each connection after using it?
>
>Thank you in advance
>
>Mirko
>
>
>
>The Exception is the following:
>
>04/08/24 15:51:59 org.apache.commons.dbcp.SQLNestedException: Cannot get a
>connection, pool exhausted 04/08/24 15:51:59 at
>org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:103)
>04/08/24 15:51:59 at
>org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
>04/08/24 15:51:59 at
>de.orb.quick.model.CommunicationLayer.executeStatement(CommunicationLayer.java:86)
>04/08/24 15:51:59 at
>de.orb.quick.model.TreeDataBean.getResult(TreeDataBean.java:57) 04/08/24 15:51:59
>at _javascript._jspService(javascript.jsp:12)
> ... bla bla bla... 04/08/24 15:51:59 at
>com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
> 04/08/24 15:51:59 at java.lang.Thread.run(Thread.java:534) 04/08/24 15:51:59
>Caused by: java.util.NoSuchElementException: Timeout waiting for idle object 04/08/24
>15:51:59 at
>org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:756)
> 04/08/24 15:51:59 at
>org.apache.commons.dbcp.AbandonedObjectPool.borrowObject(AbandonedObjectPool.java:74)
>04/08/24 15:51:59 at
>org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95)
>04/08/24 15:51:59 ... 62 more
>
>The datasource Configuration in struts-config.xml:
>
> <data-source type="org.apache.commons.dbcp.BasicDataSource">
> <set-property property="driverClassName"
> value="oracle.jdbc.driver.OracleDriver" />
> <set-property property="url" value="jdbc:oracle:thin:@host:1521:SID" />
> <set-property property="username" value="user" />
> <set-property property="password" value="pass" />
> <set-property property="initialSize" value="5" />
> <set-property property="maxActive" value="40" />
> <set-property property="maxIdle" value="5" />
> <set-property property="testOnBorrow" value="true" />
> <set-property property="maxWait" value="120000" />
> <set-property property="defaultAutoCommit" value="false" />
> <set-property property="validationQuery" value="select sysdate from dual" />
> <set-property property="removeAbandoned" value="true" />
> </data-source>
>
>
>the application snippet:
>// -----------------------------------------------------------------
> public ArrayList getResult(UserBean userBean) {
> ArrayList data = new ArrayList();
> ResultSet rset = null;
> int counter = 0;
>
> try {
> rset = executeStatement( "my sql statement" );
> if(rset != null){
> while( rset.next() ) {
>
> .. do something with the result
>
> }
> }
> } catch (Exception ex) {
> ex.printStackTrace();
> } finally {
> try {
> if (rset!= null && rset.getStatement() != null &&
> rset.getStatement().getConnection() != null) { // Close resultset & statements
> rset.getStatement().getConnection().close();
> }
> } catch (Exception ignored) { }
> }
> return data;
> }
>
>// -----------------------------------------------------------------
> public ResultSet executeStatement( List parameter ) {
> ResultSet rset = null;
> CallableStatement cstmt = null;
> try {
>
> Connection connection = dataSource.getConnection();
> String dbBuffer = new StringBuffer( parameter.get(0).toString() );
>
> if (connection != null) {
> cstmt = connection.prepareCall( dbBuffer );
> rset = cstmt.executeQuery();
> }
> } catch (SQLException ex) {
> ex.printStackTrace();
> }
> return rset;
> }
>
>
>
>
>
>Mit freundlichen Grüßen
>
>Mirko Wolf
>
>-----------------------------------------------------------------------------------------------------------------------------------------
>panta rhei systems gmbh
>budapester straße 31
>10787 berlin
>tel +49.30.26 01-14 17
>fax +49.30.26 01-414 13
>[EMAIL PROTECTED]
>www.panta-rhei.de
>
>Diese Nachricht ist vertraulich und ausschliesslich für den Adressaten bestimmt.
>Jeder Gebrauch durch Dritte ist verboten. Falls Sie die Daten irrtuemlich erhalten
>haben, nehmen Sie bitte Kontakt mit dem Absender auf und loeschen Sie die Daten auf
>jedem Computer und Datentraeger. Der Absender ist nicht verantwortlich für die
>ordnungsgemaesse, vollstaendige oder verzoegerungsfreie Übertragung dieser Nachricht.
>
>This message is confidential and intended solely for the use by the addressee. Any
>use of this message by a third party is prohibited. If you received this message in
>error, please contact the sender and delete the data from any computer and data
>carrier. The sender is neither liable for the proper and complete transmission of the
>information in the message nor for any delay in its receipt.
>
>
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