Thanks for your help.
I already find the solution.
I only need no add the following code to my class:
String keystoreLocation = "/QIBM/ProdData/Java400/jdk14/lib/security/cacerts";
System.setProperty("javax.net.ssl.trustStore", keystoreLocation);
System.setProperty("javax.net.ssl.KeyStore", keystoreLocation);
System.setProperty("javax.net.ssl.trustStorePassword", "MY_PASS");
System.setProperty("javax.net.ssl.keyStorePassword", "MY_PASS");
System.setProperty("java.protocol.handler.pkgs", "com.ibm.net.ssl.internal.www.protocol");
and the tme reduce from 20 minutes to +/- 10 seconds.