1. Try to modify the security settings of java configuration and adjust the parameters to normal. Try to switch to a lower version of jdk, uninstall jdk8, re-download jdk 1.6 installation configuration environment variables, and reopen successfully.
2. Try to uninstall jdk8 and download it again.
3. Re-downloading won't solve the problem. Try to replace the earlier version of jdk, uninstall jdk8, and download the jdk 1.6 installation configuration environment variable again.