This question already has answers here:
Connect Java to a MySQL database
(14 answers)
Closed 4 years ago.
This question might have asked here number of times . After doing some google search for the above error and doing some update, I can't understand why I'm still getting that error. I've already put my driver-- mysql-connector-java-5.1.5-bin in the classpath:
Java_Home\jre\lib\
Java_Home\jre\lib\ext\
Java_Home\lib
and the code which I'm using to connect to mysql database is:
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mail","root","");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select message_body from deadletter");
String dbtime;
while (rs.next()) {
dbtime = rs.getString(1);
System.out.println(dbtime);
}
con.close();
}
catch (SQLException e) {
System.out.println("Connection Failed! Check output console");
e.printStackTrace();
}
}
and the complete stacktrace of the above exception is:
java.lang.ClassNotFoundException: com.mysql.jdbc:Driver
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at mail.main(mail.java:114)
Now, what's wrong I'm doing here?
If you're facing this problem with Eclipse, I've been following many different solutions but the one that worked for me is this:
Right click your project folder and open up Properties.
From the right panel, select Java Build Path then go to Libraries tab.
Select Add External JARs to import the mysql driver.
From the right panel, select Deployment Assembly.
Select Add..., then select Java Build Path Entries and click Next.
You should see the sql driver on the list. Select it and click first.
And that's it! Try to run it again! Cheers!
I too struggled with the same problem and finally got the solution for it.
Just copy the MySql-Connector.jar into Tomcat's lib folder, and then remove the jar from the webapp's lib folder, and then, run the project.
The most common cause is that you have some conflict in where your classes are loaded from. For example if you have 2 locations and one has JDBC drivers and the other one not then if your classloader loads from the 1st location and some class from the 1st location wants to use the driver - the driver is not there. So look for the duplicate JARs that are using your driver
I have the same problem
but I found this after a long search:
http://www.herongyang.com/JDBC/MySQL-JDBC-Driver-Load-Class.html
But I made some change. I put the driver in the same folder as my ConTest.java file,
and compile it, resulting in ConTest.class.
So in this folder have
ConTest.class
mysql-connector-java-5.1.14-bin.jar
and I write this
java -cp .;mysql-connector-java-5.1.14-bin.jar ConTest
This way if you not use any IDE just cmd in windows or shell in linux.
this ans is for eclipse user......
first u check the jdbc jar file is add in Ear libraries....
if yes...then
check...in web Content->web Inf folder->lib
and past here jdbc jar file in lib folder.....
1) Download connector from here https://www.mysql.com/products/connector/
2) Select JDBC driver for mysql
3) click on Platform Independent (Architecture Independent), ZIP Archive
4) Download the file and unzip it
5) (For Eclipse)Click Project->properties-> Java Build Path->Libraries
(For Netbeans) right click libraries on left bar-> add jar
6) Click on add external jar
7) select mysql-connector-java-5.1.40-bin.jar
8) Done!
If you are using NetBeans follow the following steps:
Right click on 'Libraries' and select 'Add Library..'
Scroll down the list of 'Global Libraries' and select 'MySQL JDBC Driver' and click on 'Add Library'.
What did you put exactly in lib, jre/lib or jre/lib/ext? Was it the jar mysql-connector-java-5.1.5-bin.jar or something else (like a directory)?
By the way, I wouldn't put it in lib, jre/lib or jre/lib/ext, there are other ways to add a jar to the classpath. You can do that by adding it explicitly the CLASSPATH environment variable. Or you can use the -cp option of java. But this is another story.
In NetBeans,
right click on libraries, select properties
select rub tab
there you need to add the mysql-connector-java.jar and apply
You should download MariaDB connector.
Then:
Expand your project.
Right-click on Libraries.
Select Add Jar/Folder.
Add mariadb-java-client-2.0.2.jar which you just downloaded.
Ok, i find solution changing the path of mysql-conector-java.jar to the follow path:
ProjectName/WebContent/Web-inf/lib/mysql-conector-java.jar
So you need to add the conector to project again and delete the previous one.
Most of the possible solution has been covered above. From my experience of this issue, i have placed the mysql-connector-jar in the /WEB-INF/lib folder of the webapp module and it worked fine for me.
In netbean
Right click on your project, then you click on Libraries, then Run tab, add library, then select mysql connector
In IntelliJ
Do as they say in eclipse
"If you're facing this problem with Eclipse, I've been following many different solutions but the one that worked for me is this:
Right click your project folder and open up Properties.
From the right panel, select Java Build Path then go to Libraries tab.
Select Add External JARs to import the mysql driver.
From the right panel, select Deployment Assembly.
Select Add..., then select Java Build Path Entries and click Next.
You should see the sql driver on the list. Select it and click first.
And that's it! Try to run it again! Cheers!"
Here we have to add the jar file in Project Structure -> Libraries -> +(add)
I keep the mysql-connector jar with my project rather than in Javahome. As a result, you can be sure it can be found by being sure its in the local classpath. A big upside is that you you can more the project to another machine and not have to worry about (or forget) to set this up again. I personally like including it in version control.
Ok..May be i can also contribute my solution..
Right click on project -properties -->Deployment assembly...there you need to add the mysql-connector-java.jar and apply it...which makes your prject configured with web-Libraries that has this sql connector...This worked for me..
I hope this works for you guys as well
The only thing that worked for me was downloading the mysql-connector-java-5.0.8-bin.jar directly from the MySQL website:
http://dev.mysql.com/downloads/connector/j/3.1.html
Then if you're using Eclipse paste this mysql-connector-java-5.0.8-bin.jar in the WEB-INF lib folder
If doesn't works try with any of the solutions posted in this link:
http://javarevisited.blogspot.com/2012/03/jdbc-javalangclassnotfoundexception.html
I experienced the same error after upgrading my java to 1.8.0_101. Try this:
i. Remove the mysql.jar fro your buildpath.
ii. Clean the server and project
iii. Add the jar file back to the build path.
Worked for me.
Just copy the MySQL JDBC drive jar file and paste it to Tomcat or whatever is the server's lib folder. It works for me.
just copy and paste the mysqlconnector jar to your project folder and then build path it will definitely work.
see to it that the argument of Class. forName method is exactly "com. mysql. jdbc. Driver".
If yes then see to it that mysql connector is present in lib folder of the project. if yes then see to it that the same mysql connector . jar file is in the ClassPath variable (system variable)..
This question already has answers here:
java.lang.ClassNotFoundException: org.postgresql.Driver
(2 answers)
Closed 9 years ago.
I'm making a simple JDBC program in java SE 7 but after compiling program it's giving "java.lang.ClassNotFoundException: org.postgreasql.Driver" error i followed this link http://docs.oracle.com/javase/7/docs/technotes/guides/jdbc/ but not getting yet so please help.
possibly you may not be setting the path of jdbc driver
follow the steps
Right click on your project
click buildpath->configure Build Path
click libraries tab
Click add external jars and give the path of driver
This:
org.postgreasql.Driver
should likely be
org.postgresql.Driver
THe name of the driver is wrong also. Should be org.postgresql.Driver iso org.postgreasql.Driver. So maybe a typo in your java code where you do Class.forname()
You would have to add the JAR file to your classpath for org.postgresql.Driver, You can download it from HERE .
You have to add the jdbc jar file on your build path. Firstly you have to download the jar from the link you provided. Then add it to build path.
If you use eclipse: Right click on your project at the package explorer->Configure Build Path->Libraries->Add external jar->select your jar.
Please check your connection String url or connection driver and run code.
I am trying to create a Java web app project in Netbeans that uses many external JAR files.
I have created a lib folder and put all the JAR files there and I've added those Jar files to the build path. However I am still getting Package XYZ does not exist error in Netbeans.
What am I doing wrong here? How can i resolve this error? Is there some way to verify if my JARs are included or not?
Right click on your project and goto Source/Binary fromat >> Select a lower version of JDK if you have selected a higher version already. Else try choosing other version see if that makes a difference.
Today I am doing Connectivity of SqlServer using JTDS driver. But when I run program
I found Below error
Java.lang.ClassNotFoundException: net.sourceforge.jtds.jdbc.Driver
Caused by: java.lang.ClassNotFoundException: net.sourceforge.jtds.jdbc.Driver in loader dalvik.system.PathClassLoader[/data/app/com.kmkm.lll-2.apk]
I already search on this topic and I found answer as
java -classpath .:jtds.jar MyApp
but I am confuse how and where I run this command?
Why this error comes?
I had the same problem with my Android app in Eclipse. What worked for me was to export the external jars with my app.
If you have already added the jtds-1.2.5 driver, good. Otherwise:
Right click on the Project > Properties > Libraries Tab
Add the jtds-1.2.5.jar file by clicking on "Add External JARs"
Next, in the Order and Export tab (Right next to Libraries in the Java Build Path window) check the box for jtds-1.2.5.jar (and any other external jars you might have).
This will export the .jar containing the driver with the .apk file.
If you are using eclipse, Try this steps
Right click on your project
Click Build Path > Configure Build Path...
Choose Libraries tag and click Add External JARs...
Point your jtds.jar and click OK.
Rebuild and run again.
If you use a third party library, make sure you have all its required dependencies, if it requires any.
This question already has answers here:
How to add JAR libraries to WAR project without facing java.lang.ClassNotFoundException? Classpath vs Build Path vs /WEB-INF/lib
(5 answers)
Closed 1 year ago.
I am adding an external jar file to my Web server Application based on Java Servlets in Eclipse IDE. But when i tried to add that jar file an error occured as "An internal error occurred during updating tag library index . Path Must Include project and resource name:/<jar file name>". Please let me know which path the application asks or there is any specific directory where i have to put that jar file or any file where i have to update the location of jar file.
Thanks
Steps to add external jar
1.Right click on your project
2.Click on the Properties
3.Click on Java Build Path
4.Go to Libraries Tab and click on the Add External Jar button
5.Select the jar file from your local directory
6.Press OK button
JARs should go into your /WEB-INF/lib directory.