Javac cannot find or load the main class Com.sun.tools.javac.Main ecplise when configuring the JDK, 1 (to select the directory of the JDK D:\JDK\jdk_64\jdk, do not select the level of the JRE), 2 ( This error has the potential to be an environment variable, and it may be that you do not have tools in your project this package, because the project does not have this package, because this package is the JDK comes with the package, so I think this package does not need to be added manually. Last Test, this package is to be added to the project manually. Get rid of unused work space 1. Remove unused work space
In eclipse, some workspace are no longer used, and can be edited by editing the file org.eclipse.ui.ide.prefs under the Eclipse_home\configuration\.settings file.
Find "recent_workspaces=" sentence, the following value is the path of workspace, multiple paths with "\ n" separated, to delete which workspace to delete the corresponding path.
Javac cannot find or load the main class Com.sun.tools.javac.Main,
