Generating Keypair and a certificate

Question

I'm writting an applet to digitaly sign acrobat reader documents.
To sign this document i need:
- a private key
- a certificate
I'm generating both public and private key by the following code:
// Generate a 1024-bit RSA key pair
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
keyGen.initialize(1024);
KeyPair keypair = keyGen.genKeyPair();
PrivateKey privateKey = keypair.getPrivate();
PublicKey publicKey = keypair.getPublic();
To test the application i don't want to use a certificate authority, i just want to get a certificate from the public key with:
the user name
the revocation date
etc...
without using command line
thank you

Answer 1

different implementation have different convinent approaches in from of utility methods or classes doing this, if you don't want to take the work of putting the extensions and the key together and get it signed yourself.
Look at the bouncycastle provider for example (www.bouncycastle.org) for the class org.bouncycastle.jce.X509V3CertificateGenerator