package ca.uhn.hl7v2.examples.hoh;
   
   import ca.uhn.hl7v2.hoh.hapi.server.HohServlet;
   import ca.uhn.hl7v2.hoh.sign.BouncyCastleCmsMessageSigner;
   import ca.uhn.hl7v2.hoh.util.KeystoreUtils;
   import jakarta.servlet.ServletConfig;
   import jakarta.servlet.ServletException;
   
   //START SNIPPET: servlet 
  public class SignatureServlet extends HohServlet {
  
  	@Override
  	public void init(ServletConfig theConfig) throws ServletException {
  		
  		//Create a message signer and pass it to the servlet
  		BouncyCastleCmsMessageSigner signer = new BouncyCastleCmsMessageSigner();
  		try {
  			signer.setKeyStore(KeystoreUtils.loadKeystore("/path/to/keystore/keystore.jks", "store_password"));
  		} catch (Exception e) {
  			throw new ServletException(e);
  		}
  		signer.setKeyAlias("keyalias");
  		signer.setAliasPassword("key_password");
  		setSigner(signer);
  	
  		// ... also provide a message handler ...
  		
  	}
  
  }
  //END SNIPPET: servlet