Eclipse - Java.Lang.Classnotfoundexception

Eclipse - java.lang.ClassNotFoundException

I've come across that situation several times and, after a lot of attempts, I found the solution.

Check your project build-path and enable specific output folders for each folder. Go one by one though each source-folder of your project and set the output folder that maven would use.

For example, your web project's src/main/java should have target/classes under the web project, test classes should have target/test-classes also under the web project and so.

Using this configuration will allow you to execute unit tests in eclipse.

Just one more advice, if your web project's tests require some configuration files that are under the resources, be sure to include that folder as a source folder and to make the proper build-path configuration.

Eclipse java.lang.ClassNotFoundException

Since you're using Eclipse, you can right click on your project and within the context menu select: "Build Path" -> "Configure Build Path..."

Click on the Libraries tab and then click the "Add JARs..." button and add the jar file that contains your embedded driver.

JUNIT Test class in Eclipse - java.lang.ClassNotFoundException

ConfigurationManagerTest is not being found on your classpath. Ensure that the ConfigurationManagerTest.class file is available on your classpath.

It might not exist if it wasn't successfully compiled or if it's being created in a directory that you haven't told the Eclipse project should be on the classpath.

Assuming that you've put your test classes in a separate folder, make sure that it shows up in the "Package Explorer" view (rather than the "Navigator" view).

Under the project properties, "Java Build Path" and the "Source" tab, you can also see if the source folder is included for building as well as where the .class files are generated.

Class Not Found Exception after cleaning project in Eclipse

Are you sure there are no build errors in any of your classes? If there are errors, eclipse would could run the previous error free version (according to some settings you provide). Build errors can also lead to the class files not being generated after a project clean.

java.lang.NoClassDefFoundError when I add external JARs using Eclipse IDE

Actually I figured out that I add the external jar file to the module path but not the class path. So the Eclipse IDE didn't throw any error but at run time Java threw java.lang.NoClassDefFoundError. After I have added the jar to the class path, it's OK. It's in: right click the project -> Properties -> Java Build Path -> Libraries -> Classpath -> Add external JARs.