> Cannot Load
> Cannot Load Driver Org.apache.derby.jdbc.clientdriver
Cannot Load Driver Org.apache.derby.jdbc.clientdriver
Since I'm still stuck with Hibernate, I can't advise very well about how to best integrate a connection pooling library and Cayenne. Thank you very much to have helped me :D Solution : Add derbyclient.class in "Maven Dependencies". I don't have any .war file -- View this message in context: http://cayenne.195.n3.nabble.com/Can-not-load-JDBC-driver-named-org-apache-derby-jdbc-ClientDriver-tp3950272p3950341.htmlSent from the Cayenne - User mailing list archive at Nabble.com. I reread your question and I see that you have it working in the modeler but want to make it work with your Jetty application. Source
That means that you use such a library, but not for the pooling (no need to share connection across "requests", there is no such thing in a J2SE application unless your It contains EmbeddedDriver, but not ClientDriver. Ari On 30/04/12 7:37pm, Tadrierion wrote: > Sorry for double post : how I'm suppsoe to do that* > > -- > View this message in context: http://cayenne.195.n3.nabble.com/Can-not-load-JDBC-driver-named-org-apache-derby-jdbc-ClientDriver-tp3950272p3950324.html> Sent from the It would be nice to borrow this trick if it isn't hard to implement. http://stackoverflow.com/questions/15842229/class-org-apache-derby-jdbc-clientdriver-not-found-when-trying-to-connect-to
But what should I do when the thread has completed its transactions and is ready to terminate? I'm sure the database administrator won't like to see my app opening and closing connections to their database so I would prefer to open up a pool of connections and then I have created a database and I have generated classes thanks to Cayenne.
If your application runs on JDK 6 or higher, you do not need to explicitly load the EmbeddedDriver. So you have some sources and libraries that are assembled into a .war file. Bye Axel Andrus Adamchik Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: Can not load JDBC driver named 'org.apache.derby.jdbc.ClientDriver' Ari On 30/04/12 7:41pm, Aristedes Maniatis wrote: > You download the relevant jar file from the derby project page and you put it into your Java classpath. > > Andrus, one
I'd probably look up the Cayenne docs on connection pooling, and just make sure that everything is configured explicitly that the web container would do for you implicitly. It's unlikely that you'll have hundreds of simultaneous threads in your standalone app. I will have multiple short lived threads requesting database information simultaneously so I'm not quite sure how to manage the Cayenne components. http://stackoverflow.com/questions/11533921/where-is-org-apache-derby-jdbc-clientdriver In that environment, the driver loads automatically.
I tried to do the same things but on the same computer, and I have the same error. On Mon, Apr 30, 2012 at 1:36 PM, Andrew Willerding <[hidden email]> wrote: > I have built a few Web apps using Cayenne quite successfully but now I am > building During the war assembly step derbyclient.jar should end up inside the project .war under WEB-INF/lib/ location. I run the main class in the client machine and I obtain an error : 26-Apr-2012 10:25:15 org.apache.cayenne.access.QueryLogger logConnectFailure INFO: *** Connecting: FAILURE.
Now I want to connect more than one client on the database at the same time. http://stackoverflow.com/questions/21186997/java-class-org-apache-derby-jdbc-clientdriver-not-found I tried to enter an unknown driver and I have the same error. Not a problem. > I'm sure the database administrator won't like to see my > app opening and closing connections to their database > so I would prefer to open up It would be nice to borrow this trick if it isn't hard to implement. > > Ari > > > > On 30/04/12 7:37pm, Tadrierion wrote: >> Sorry for double post
They have a neat trick of downloading the right driver jar right from within the application. http://nerdwideweb.com/cannot-load/cannot-load-jdbc-driver-class-com-mysql-jdbc-driver-sonar.html Applications running on JDK 5 or earlier must load the driver in order to work with the database. java.sql.SQLException: Can not load JDBC driver named 'org.apache.derby.jdbc.ClientDriver': org.apache.derby.jdbc.ClientDriver at org.apache.cayenne.conn.DriverDataSource.loadDriver(DriverDataSource.java:59) at org.apache.cayenne.conn.DriverDataSource.setDriverClassName(DriverDataSource.java:253) at org.apache.cayenne.conn.DriverDataSource.(DriverDataSource.java:98) To me the "createChildContext" >> implies creation without limit so if they are somehow linked how will I know >> that the underlying ConnectionPool has run out of resources? >> >>
Parent topic: Derby embedded basics Related concepts Derby JDBC database connection URL Derby system A Derby database Connecting to databases Working with the database connection URL attributes Using Derby with IDEs I verify in the library if the driver is here : http://www.hostingpics.net/viewer.php?id=139903untitled.pngThanks Tadrierion Andrus Adamchik Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as If so, then what happens when the (ConnectionPool + 1) createDataContext() request is made? have a peek here Thank you to spend your time to help me.
For example: Class.forName("org.apache.derby.jdbc.EmbeddedDriver"); java -Djdbc.drivers=org.apache.derby.jdbc.EmbeddedDriver applicationClass For detailed information about loading the Derby JDBC driver, see "java.sql.Driver interface" in the Derby Reference Manual. Andrew Willerding-2 Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Standalone app, Threads and Object contexts I have built a Transactions can fail due to transient errors, so you want them restartable, which means you need to wrap them in objects, and there you have your requests. (This pattern also sucks
If > not, then you can worry about finding another way to optimize it. > > On Mon, Apr 30, 2012 at 1:36 PM, Andrew Willerding > <[hidden email]> wrote: >>
The Derby driver class name for the embedded environment is org.apache.derby.jdbc.EmbeddedDriver. But either way you need to get the jar into your classpath. You might then add the jar to Eclipse run classpath ("Run > Run Configurations > (select your config) > Classpath") On Apr 30, 2012, at 12:45 PM, Tadrierion wrote: > In It works perfectly and this, from a remote client.
Standalone apps tend to work by opening a single Connection and using that for all requests. I run the main class in the client machine and I obtain > an error : > > /26-Apr-2012 10:25:15 org.apache.cayenne.access.QueryLogger > logConnectFailure > INFO: *** Connecting: FAILURE. Essentially, you're doing the exactly same web service architecture, except it's running inside a single JVM.) 123 « Return to Cayenne - User | 1 view|%1 views Loading... http://nerdwideweb.com/cannot-load/cannot-load-jdbc-driver-class-39-oracle-jdbc-driver-oracledriver-39-spring.html I don't see a corresponding "destroyChildContext" >> >> ObjectContext oc = getDataContext().createChildContext(); >> >> 2) Or is it better to create a pool of ObjectContexts
Derby JDBC driver Derby consists of both the database engine and an embedded JDBC driver. It's unlikely that > you'll have hundreds of simultaneous threads in your standalone app. > > Start with createDataContext() and see if it works well enough. The "request" > discussed above is a web server http request. Driver used : org.apache.derby.jdbc.EmbeddedDriver URL : jdbc:derby:database I have created a "main" class to insert and delete some informations from the database (it's not a memory database).
So in CayenneModeler I change the driver and the URL : Driver used : org.apache.derby.ClientDriver URL : jdbc:derby://localhost/database After' I launch the jetty server (port 8080) and the derby server (port Andrus On Apr 30, 2012, at 12:35 PM, Tadrierion wrote: > Yes I understand but when i'm suppose to do that ? (I'm not a pro :s) > > -- > Thank you very much. In a Web app, I have typically just setup my Tomcat configuration and in my code I execute something like ObjectContext context = BaseContext.getThreadObjectContext() and let the "magic" happen.
Yes, I don't say it before sorry. In an embedded environment, loading the driver also starts Derby. The "request" discussed above is a web server http request. In a Java application, you typically load the driver with the static Class.forName method or with the jdbc.drivers system property.
Normally, they are in my classpath : http://www.hostingpics.net/viewer.php?id=835825untitled.png Andrus Adamchik Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: Can But what >> should I do when the thread has completed its transactions and is ready to >> terminate? At first I thought I could simple do a DataContext.createDataContext() and I'd be fine but "Creating a new DataContext for each request is not a recommended practice." So I understand the Or am I misunderstanding how createDataContext() works in that it is already managing the pool of connections will only establish a new connection when the requests exceed the number of already
Andrus, one of the neatest tools I've used in this regard is dbeaver. In my standalone application I don't think it will be quite that easy. One project on the client with all generated classes and one main class which connect to the server. Applications use JDBC to interact with a database.
If your application shuts down Derby or calls the DriverManager.deregisterDriver method, and you then want to reload the driver, call the Class.forName().newInstance() method. The snag here is that connections will break sooner or later (due to networking problems, server restarts, idle time, or a multitude of other causes), so this needs a library that In "Run Configurations", I have created my jetty server : http://www.hostingpics.net/viewer.php?id=786507untitled.png Tadrierion Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦