arduino IDE doesn't want to stard because of a Javax.jmdns error

Hi everybody,

I’m a newbie in arduino prototyping. I have downloaded arduino IDE 1.8.2 and i’ve installed it (using the installer downoadable via the website). But when i run it, it displays a prompt box saying “a Java Exception has occured”. When i execute arduino_debug.exe it outputs the following:

c:\Program Files (x86)\Arduino>arduino_debug.exe
Exception in thread “main” java.lang.NoClassDefFoundError: javax/jmdns/ServiceLi
stener
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14
2)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at cc.arduino.packages.DiscoveryManager.(DiscoveryManager.java:47)

at processing.app.BaseNoGui.(BaseNoGui.java:50)
at processing.app.Base.(Base.java:77)
Caused by: java.lang.ClassNotFoundException: javax.jmdns.ServiceListener
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
… 15 more

Does anyone knows how should i do to resolve the problem?

Thankx in advance

problem solved!!! its source was Comodo Internet Security. It has blocked all the executable stuff of arduino IDE. I added the application to the trusted apps and it has started :slight_smile: thx anyway