Re: JNDI/Tomcat question from newbie
Personally, I'd just keep a reference to the datasource around maybe as a class instance variable. It doesn't constitute a connection in and of itself -- just a way of getting one from the pool. Connections on the other hand should be explicitly closed as soon as they aren't needed anymore in any method that get's one. --David Hyatt, Gordon wrote: Hello All, I'm a newbie to database pooling via JNDI and I have a JNDI/Tomcat question (more of a best practices/most scalable/fastest performance/least resource consumption type of question). Each time the JNDI resource (pooled database connection) is needed, should a complete JNDI lookup be performed or can part of the lookup be cached? For example, should the code be: code Context initCtx = new InitialContext (); Context envCtx = (Context)initCtx.lookup (java:comp/env); ds = (DataSource)envCtx.lookup (jdbc/data_source_name); /code or can the java:comp/env Context be saved as an attribute in the servlet context and a (synchronized) code segment like the following be used to obtain the DataSource? code Context ctx = (Context)ctxFromServletContext.lookup (); ds = (DataSource)ctx.lookup (jdbc/data_source_name); /code Thus far, I haven't read anything about which method is acceptable/preferred or if one method yields significant performance benefit. Since, according to the docs a Context is not guaranteed to be synchronized against concurrent access by multiple threads, I assume that the first code segment above should be synchronized, especially if it is in a static method. Thanks in advance, Gord - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- === David Smith Network Operations Supervisor Department of Entomology College of Agriculture Life Sciences Cornell University 2132 Comstock Hall Ithaca, NY 14853 Phone: 607.255.9571 Fax: 607.255.0939 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: JNDI - TOMCAT
Don't use docs based on 4.1 when running 5.5. Use the 5.5 docs. The way JNDI resources are declared in 5.5 changed as compared to previous versions. The archives in the tomcat user list also talk about this too. http://jakarta.apache.org/tomcat/tomcat-5.5-doc/index.html -Tim Kane Wilson wrote: Hi List , This is actually problem with JNDI . I'm tring to connect to mysql database via JNDI in tomcat 5.5.9. First of all i installed tomcat 5.5.9 in my windows 2000 advance server machine and accrding to guide of http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html url , I have done every thng according to the article. my sql connector is mysql-connector-java-3.1.10-bin.jar C:\Tomcat\common\lib after all the steps get done , i pointed to the test.jsp but i got an error saying , DataSource invalid: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null' === so then i surf the internet to findout a soloution , there are plenty of such issues and some closest solutions with crerating .war files , changing some parameters like that . http://www.theserverside.com/tss?service=direct/0/DiscussionThread/threadViewer.bookmark.linksp=l29795 but , i would like to ask from directly from jakarta.apache.org/tomcat , do u have sudgested a solution for this matter / problem ? is it a bug in that particular version ( 5.5.9 ) ? do i have to switched for another version ? is that problem of curruption of mysql connector ? can i findout any one who has already solved this issue ? I read well FAQ's rules and regulations . i agreed with that . and i think , this issue has discussed couple of times in this list. but i cant findout exactly how could be the solution was ! . Please help me , it's really appreciate if u guys can consider this problem deeply . Thanx in advance for Tomcat and the LIST , Kane. - Start your day with Yahoo! - make it your home page - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: JNDI - TOMCAT ------ success
Tim , it was success. thanx million. earlier i referred 5.0 docs. anyway it was my fault. again i would like to thank you Tim. It is great help Kane. Tim Funk [EMAIL PROTECTED] wrote: Don't use docs based on 4.1 when running 5.5. Use the 5.5 docs. The way JNDI resources are declared in 5.5 changed as compared to previous versions. The archives in the tomcat user list also talk about this too. http://jakarta.apache.org/tomcat/tomcat-5.5-doc/index.html -Tim Kane Wilson wrote: Hi List , This is actually problem with JNDI . I'm tring to connect to mysql database via JNDI in tomcat 5.5.9. First of all i installed tomcat 5.5.9 in my windows 2000 advance server machine and accrding to guide of http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html url , I have done every thng according to the article. my sql connector is mysql-connector-java-3.1.10-bin.jar C:\Tomcat\common\lib after all the steps get done , i pointed to the test.jsp but i got an error saying , DataSource invalid: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null' === so then i surf the internet to findout a soloution , there are plenty of such issues and some closest solutions with crerating .war files , changing some parameters like that . http://www.theserverside.com/tss?service=direct/0/DiscussionThread/threadViewer.bookmark.linksp=l29795 but , i would like to ask from directly from jakarta.apache.org/tomcat , do u have sudgested a solution for this matter / problem ? is it a bug in that particular version ( 5.5.9 ) ? do i have to switched for another version ? is that problem of curruption of mysql connector ? can i findout any one who has already solved this issue ? I read well FAQ's rules and regulations . i agreed with that . and i think , this issue has discussed couple of times in this list. but i cant findout exactly how could be the solution was ! . Please help me , it's really appreciate if u guys can consider this problem deeply . Thanx in advance for Tomcat and the LIST , Kane. - Start your day with Yahoo! - make it your home page - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: JNDI + Tomcat + Oracle 9i Database
Hi [difficult name ommited],
I had this problem a couple of weeks ago.
try changing the url to capitals !
nameURL/name
This fixed an identical problem for me.
Thanks,
Mehdi Nejad
Sebastião Carlos
Santos To: [EMAIL PROTECTED]
[EMAIL PROTECTED]cc:
.com.br Subject: JNDI + Tomcat + Oracle 9i
Database
25/02/2003 15:02
Please respond to
Tomcat Users
List
I am trying to configure JNDI to access Oracle 9i R1,
according to JNDI Datasource HOW-TO,
however I am not obtaining a lot of success when I go
to establish the connection.
In the end of this e-mail I will list some fragments of the configuration
of server.xml,
web.xml and of my class java that I am using to accomplish the connection
test.
The reference $CATALINA_HOME/common/lib/*. jar is in CLASSPATH of the
system
Fragment of configuration of server.xml
...
Resource name=jdbc/sged auth=Container
type=javax.sql.DataSource/
ResourceParams name=jdbc/sged
parameternamefactory/name
valueorg.apache.commons.dbcp.BasicDataSourceFactory/value/parameter
parameternamedriverClassName/name
valueoracle.jdbc.driver.OracleDriver/value/parameter
parameternameurl/name
valuejdbc:oracle:[EMAIL PROTECTED]:1521:XXX/value/parameter
parameternameusername/namevaluescott/value/parameter
parameternamepassword/namevaluej/value/parameter
parameternamemaxActive/namevalue20/value/parameter
parameternamemaxIdle/namevalue10/value/parameter
parameternamemaxWait/namevalue1/value/parameter
parameternameremoveAbandoned/namevaluetrue/value/parameter
parameternameremoveAbandonedTimeout/namevalue60/value/parameter
parameternamelogAbandoned/namevaluetrue/value/parameter
/ResourceParams
...
File /web/WEB-INF/web.xml
?xml version=1.0 encoding=ISO-8859-1?
!DOCTYPE web-app PUBLIC
-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN
http://java.sun.com/dtd/web-app_2_3.dtd;
web-app
descriptionOracle Database Connection/description
resource-ref
descriptionPool/description
res-ref-namejdbc/sged/res-ref-name
res-typejavax.sql.DataSource/res-type
res-authContainer/res-auth
/resource-ref
welcome-file-list
welcome-fileindex.html/welcome-file
welcome-fileindex.jsp/welcome-file
welcome-fileindex.htm/welcome-file
/welcome-file-list
/web-app
Method of the class java that makes the connection test
public String obtem_dados()
{
Connection conn = null;
Statement stmt = null;
ResultSet rset = null;
resultado = new StringBuffer();
try
{
Context initContext = new InitialContext();
Context envContext = (Context)initContext.lookup
(java:/comp/env);
DataSource ds = (DataSource)envContext.lookup
(jdbc/sged);
conn = ds.getConnection();
stmt = conn.createStatement();
rset = stmt.executeQuery(SELECT COUNT(*) FROM
V$SESSION);
if (rset.next())
{
resultado.append(Número de Conexões - );
resultado.append(rset.getString(1));
resultado.append(br);
}
}
catch (java.lang.Exception e)
{
Re: JNDI + Tomcat + Oracle 9i Database
When I made the change of the nameurl / name for nameURL / name I started to receive the following error message Cannot create JDBC driver of class 'oracle.jdbc.driver.OracleDriver' it goes connect URL 'null' Going back to the configuration nameurl / name Cannot create JDBC driver of class 'oracle.jdbc.driver.OracleDriver' it goes connect URL 'jdbc:oracle:[EMAIL PROTECTED]:1521:GED' Taking advantage of the opportunity, which driver JDBC should use, ojdbc14.jar (for the jdk 1.4) or classes12.zip, that should have the name according to the documentation changed for classes12.jar Sebastião Carlos Santos Oracle Database Administrator Universidade Federal de Uberlândia - UFU Gratificação de Estímulo à Docência - GED - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: JNDI + Tomcat + Oracle 9i Database
Kris, I believe that I went badly interpreted or I wrote of less in the e-mail. I don't see him/it why of installing the customer of Oracle 9i in the application servant for the simple fact most of the time, after the installation routines we have to specify the files. zip and. jar copied in the installation for ORACLE_HOME in CLASSPATH of the system, which in other words it would be the same thing of using the drivers jdbc supplied separately. I didn't have the intention of contradicting the positioning for you put. Respectfully, Sebastião Carlos Santos Oracle Database Administrator Universidade Federal de Uberlândia - UFU Gratificação de Estímulo à Docência - GED
RE: JNDI + Tomcat + Oracle 9i Database
This issue has been asked and answered again and again in the mailing list of tomcat, struts, and commons. Consider that Oracle is so populate, setup should be pretty straightforward. My advice is to make sure that you have read carefully the tomcat datasource documentation. My environment is J2sdk 1.4.1_01 = 1.4 Tomcat 4.1.18 Apache 2.0.44 Tomcat Connector 2.0.3 Red Hat Linux 7.2 (prod) Windows 2000 (dev) Oracle 8.1.7 classes12.jar = 1.2 1. Below is part of my context. Do not invent the resource type, driver, and factory. I saw someone use a different factory or driver think they are going to utilize Oracle's pooling. It is smart but it is wrong in this case. To prove it is wrong, read Tomcat source code. Resource name=jdbc/abcd auth=Container type=javax.sql.DataSource/ ResourceParams name=jdbc/abcd parameter namedriverClassName/name valueoracle.jdbc.driver.OracleDriver/value /parameter parameter nameurl/name valuejdbc:oracle:thin:@oratest.int.abcd.com:1521:PROD/value /parameter 2. Also in my app's web.xml resource-ref descriptionOracle Datasource/description res-ref-namejdbc/abcd/res-ref-name res-typejavax.sql.DataSource/res-type res-authContainer/res-auth /resource-ref Do not put commons-dbcp and pooling jars in your app's WEB-INF/lib, use Tomcat's (in common/lib). 3. Initialize the connection pool and get connection: Context initContext = new InitialContext(); Context envContext = (Context) initContext.lookup(java:comp/env); DataSource dataSource = (DataSource) envContext.lookup(jdbc/abcd); dataSource.getConnection() Don't do anything other than point 3 to get the connection or driver. I have had two problems before: - null driver: renamed classes12.zip to classes12.jar and put it ONLY in commons/lib. - cannot connect: use a real url other than Microsoft's name, so oratest won't work on linux while oratest.mydomain.com works. - cast exception: use commons dbcp and pooling in commons/lib. Regards, PQ This Guy Thinks He Knows Everything This Guy Thinks He Knows What He Is Doing -Original Message- From: Sebastião Carlos Santos [mailto:[EMAIL PROTECTED] Sent: February 25, 2003 1:37 PM To: [EMAIL PROTECTED] Subject: Re: JNDI + Tomcat + Oracle 9i Database When I made the change of the nameurl / name for nameURL / name I started to receive the following error message Cannot create JDBC driver of class 'oracle.jdbc.driver.OracleDriver' it goes connect URL 'null' Going back to the configuration nameurl / name Cannot create JDBC driver of class 'oracle.jdbc.driver.OracleDriver' it goes connect URL 'jdbc:oracle:[EMAIL PROTECTED]:1521:GED' Taking advantage of the opportunity, which driver JDBC should use, ojdbc14.jar (for the jdk 1.4) or classes12.zip, that should have the name according to the documentation changed for classes12.jar Sebastião Carlos Santos Oracle Database Administrator Universidade Federal de Uberlândia - UFU Gratificação de Estímulo à Docência - GED - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
