Thank you very much. Standalone apps tend to work by opening a single Connection and using that for all requests. 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. Thank you very much to have helped me :D > > Solution : Add derbyclient.class in "Maven Dependencies". > > Thank you very much. > > Bye > > Axel > http://apicsa.net/cannot-load/cannot-load-jdbc-driver-class-org-apache-derby-jdbc-clientdriver.html
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 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 If so, then what happens when the (ConnectionPool + 1) createDataContext() request is made? 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 http://stackoverflow.com/questions/15842229/class-org-apache-derby-jdbc-clientdriver-not-found-when-trying-to-connect-to
Thanks, Andrew Mike Kienenberger Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: Standalone app, Threads and Object contexts > I don't see a corresponding "destroyChildContext" ObjectContext oc = getDataContext().createChildContext(); 2) Or is it better to create a pool of ObjectContexts that I have to 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.
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). 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. 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 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) > > -- >
I tried to enter an unknown driver and I have the same error. 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? 4) Or am I If not, then you can worry about finding another way to optimize it. 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
It would be nice to borrow this trick if it isn't hard to implement. 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. 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 Tadrierion Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: Can not load JDBC driver named 'org.apache.derby.jdbc.ClientDriver' I'm sorry, it's
If your application runs on JDK 6 or higher, you do not need to explicitly load the EmbeddedDriver. 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 Derby JDBC driver Derby consists of both the database engine and an embedded JDBC driver. Since I'm still stuck with Hibernate, I can't advise very well about how to best integrate a connection pooling library and Cayenne.
In that environment, the driver loads automatically. http://apicsa.net/cannot-load/cannot-load-jdbc-driver-class-oracle-jdbc-driver-oracledriver.html 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 ♦ ♦ Free forum by Nabble Edit this page Try derbyclient.jar instead: ~/opt/db-derby-10.5.3.0-bin/lib: jar tvf derby.jar |grep ClientDriver (no output) ~/opt/db-derby-10.5.3.0-bin/lib: jar tvf derbyclient.jar |grep ClientDriver 6948 Mon Aug 10 13:16:38 FEST 2009 org/apache/derby/jdbc/ClientDriver.class Andrus On Apr 30, 2012,
I don't see a corresponding "destroyChildContext" >> >> ObjectContext oc = getDataContext().createChildContext(); >> >> 2) Or is it better to create a pool of ObjectContexts 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 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 click site Start with createDataContext() and see if it works well enough.
In an embedded environment, loading the driver also starts Derby. 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. Connection pooling libraries do that as a side effect.
It works perfectly and this, from > a remote client. > > Now I want to connect more than one client on the database at the same time. > So in I will have multiple short lived threads requesting database information simultaneously so I'm not quite sure how to manage the Cayenne components. 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 Yes, I don't say it before sorry.
It works perfectly and this, from a remote client. Applications running on JDK 5 or earlier must load the driver in order to work with the database. One Database on the server. navigate to this website One > Database on the server. > One project on the client with all generated classes and one main class > which connect to the server. > > I launch two
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... 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 I launch two servers : Jetty Server and Derby Server. I assume your project follows a standard Java web app structure.
The "request" > discussed above is a web server http request. 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 But what should I do when the thread has completed its transactions and is ready to terminate? The "request" discussed above is a web server http request.
But what >> should I do when the thread has completed its transactions and is ready to >> terminate? 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? >> >> BTW I've been working on a J2SE application for the last three years, and it's probably really a good idea to design the application around "requests" or "transactions". It's unlikely that you'll have hundreds of simultaneous threads in your standalone app.
On Apr 30, 2012, at 12:29 PM, Tadrierion wrote: > I'm sorry but I work on Windows XP :s > > I verify and yes, derby.jar don't contain ClientDriver > > Andrus, one of the neatest tools I've used in this regard is dbeaver. 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. They have a neat trick of downloading the right driver jar right from within the application.
Applications use JDBC to interact with a database. They have a neat trick of downloading the right driver jar right from within the application. 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. 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'
It contains EmbeddedDriver, but not ClientDriver. I have no problem building the pool solution but I just need to understand the best way to utilize the Cayenne components and not duplicate or over-build what may already exist.