尝试使用JarSigner.exe签名apk文件时出现NoClassDefFoundError

Question

I try to sign an android application using the file JarSigner.exe (In windows).

What I did was creating a designated dir in which I placed the JarSigner.exe along with all the other files in JRE\\bin.

Of course I also put there the keystore file.

I openned a cmd window (as an administrator) and changed dir to the designated dir I created.

There I gave the command:

jarsigner -keystore myKeystore myApp.apk myself

The result was as follows:

Exception in thread "Main Thread" java.lang.NoClassDefFoundError: sun/security/t
ools/JarSigner
Caused by: java.lang.ClassNotFoundException: sun.security.tools.JarSigner
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: sun.security.tools.JarSigner.  Program will exit.

Does someone know why does it happen, or how can I fix it?

Answer 1

What I did was creating a designated dir in which I placed the JarSigner.exe along with all the other files in JRE

That was your mistake. What you should have done was adjust the PATH to include the JDK bin directory, or provide the full path to jarsigner,exe when running it.

Answer 2

you must be add tools.jar to your classpath you can look this link for more information

how you can add JAR in to Classpath in Java