The Spring Project JUnit test error ClassNotFoundException resolved,

The MyEclipse item has a red exclamation point and each package is displayed as normal. With JUnit test part can run, partial error, error is as follows:

Class not found N_JDBC. Userdaotest
Java.lang.ClassNotFoundException:n_jdbc. Userdaotest
At Java.net.urlclassloader$1.run (urlclassloader.java:200)
At java.security.AccessController.doPrivileged (Native Method)
At Java.net.URLClassLoader.findClass (urlclassloader.java:188)
At Java.lang.ClassLoader.loadClass (classloader.java:307)
At Sun.misc.launcher$appclassloader.loadclass (launcher.java:301)
At Java.lang.ClassLoader.loadClass (classloader.java:252)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClass (remotetestrunner.java:693)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClasses (remotetestrunner.java:429)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests (remotetestrunner.java:452)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests (remotetestrunner.java:683)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run (remotetestrunner.java:390)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main (remotetestrunner.java:197)

Solve:

Under Window----->preferences---->java---->compiler---->building page:

Modify the following two properties: Error---->warning

Modified to:

It's working again, and the reason is not clear.

The Spring Project JUnit test error ClassNotFoundException resolved,