I have been working on project and when i made the jar file and executed it, everything works fine but when the sql connector is called,It gives an error saying mysql driver not found.
I have included mysql connector jar file in the project build path. MySQL function works fine when executed in Eclipse.
Please Make sure that the Jar file and the Lib directory Containing the Connector Jar are in the same location like this
Myjarfile.jar
libdirectory
Myconnectorjar.jar
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I'm trying to connect to a database using Derby in Java (using NetBeans), bIt i keep getting this error when I try to create a new database:
An error occurred while crating the database java.lang.ClassNotFoundException; org.apache.derby.jdbc.ClientDriver.
I've tried using Derby 10.16.1.1 and Derby 10.14.2.1.
The error message you are seeing suggests that the class org.apache.derby.jdbc.ClientDriver is not being found by the class loader at runtime. This class is necessary for connecting to a Derby database.
There are few possible causes:
The Derby jdbc driver is not in the class path of your project or application.
The version of jdbc driver jar file isn’t correct version for the version of Derby you are using. Please, check versions.
There is a comprehensive derby documentation where you can find more info and step-by-step guide.
In order to add org.apache.derby.jdbc.ClientDriver to your class path you can do few things, depending on your development environment:
If you're using an IDE like Netbeans, you can add the JAR file to the project's build path by IDE UI, for example, that thread explains how to do so.
If you're building your project with a build tool like Maven or Gradle, you can add the JAR file as a dependency in your project's pom.xml file or build.gradle file. You can read more about that approach here and here
If you're running your project from the command line, you can add the jar file to the classpath by specifying it as a command-line argument when running your project's main class. For example, if the jar file is located in /lib/derby-jdbc.jar, the command would be:
java -cp /lib/derby-jdbc.jar YourMainClass
I've added mysql connector jar file, but class not found exception still arises.
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Your error clearly says that the MySql connector jar is not placed in the correct folder. The correct folder is WEB-INF/lib. So place your jar in this folder.
You have your eclipse project referencing the mysql library. This allows the compiler, in eclipse, to find the classes when compiling. However, you do not have the library as part of your web app when you publish it to your tomcat server. You need to remove the library from the project, and copy the jar file into your app's WEB-INF/lib directory.
java.lang.classnotfoundexception com.mysql.jdbc.MySql issued by WebAppClassLoader. This tells that you need to include MySql connector jar in your web path under WEB-INF/lib directory.
I having some problems; I have Completed My Java Database Project in net-beans. I also use Java DB or Derby, mins embedded database for back-end. I run my Project and it is successfully runs and it works properly with derby database. I set the database location in my project.
Then, I have created a Project JAR file. This jar file present on my project sub-folder that is, dist folder and then I have run it. And it work but I have coped the jar file and paste another directory it runes but is not connect with derby database and also copied whole project and paste another directory. Yet it does not work, only jar file is worked but database is not work.
I also want to create an exe file of my project and run on another computer without having any kind of software on user machine. How I can build the database in my project. how I can attach database file in my project.
Can you tell me, what I do? And also help if, I am use a MySQL then I have need all above requirements. What will happen to me?
Looks like jar file generated by you doesn't include dependencies.
To generate a jar file with dependencies while building a jar:
Select "Extract required libraries into generated JAR" as you do the export.
Select "Extract required libraries into generated JAR" as you do the export.
You can use this runnable jar file as executable.
I created a simple web application in eclipse which connect to sql server. I downloaded the sql driver and added it to build path like this:
Build Path->Configure Build Path->Add External JARs.
When I run my application on Tomcat I get exception: ClassNotFoundException. I think that I know what it reason is (the folder WEB-INF->lib of my application is empty). When I put jar file of driver in WEB-INF->lib - everything is good. How I can add jar file(sql driver) to folder WEB-INF->lib of my application using eclipse?
Putting the JDBC driver JAR in [Tomcat-install-root]/lib will solve your problem, and you can do that outside of Eclipse.
I have a library that contains functionality to connect to on oracle database. When I export this library (as a JAR) and use it in the main project, it gives an exception when loading the driver with class.forname. It obviously cannot find the ojdbc driver. I included this driver in the build path and as exported library.
I tested and used the driver directly from the main project, and it work, it connects to oracle db.
Thanks.
The problem is that your driver is a jar file, and when you export the app as a jar file, that driver will be a jar file in a jar file. For that scenario you either need a special classloader or put the driver jar file in the classpath of your main program.
Explore your exportedjar by using WinRar and check if it contains a jar under jar.