Where is jarsigner?

For posterity's sake, if you are trying to actually use jarsigner to sign a jar file (such as that of an applet) with a keystore, you'll need to reference jarsigner while running the command from the folder that your keystore is in:

cd "C:\Program Files\Java\jre(version#)\bin"

then

"C:\Program Files\Java\jdk(version#)\bin\jarsigner.exe" -keystore mykeystore (PATH TO YOUR .JAR)\MyJarFile.jar alias

The above might be obvious, but it took me a few tries because I was trying to call jarsigner while inside the JDK folder, which had no knowledge of where my keystore was (in the jre directory!), so I hope this will help those who would like to see a usable syntax for that situation.

It's in the bin folder of your java JDK install (Java SE). If you only have the JRE installed you probably don't have it.

If you are on Mac or Linux, just go to the terminal and type in:

whereis jarsigner

It will give you the location of the jarsigner

%JAVA_HOME%\bin\jarsigner

You can find jarsigner there. Install jdk first.