apache ftpserver 使用 ssl启动时报错，求解决

[code="java"]public class FtpServerTest {
public static void main(String[] args) {
try {
FtpServerFactory serverFactory= new FtpServerFactory();
ListenerFactory factory=new ListenerFactory();
factory.setPort(21);
SslConfigurationFactory ssl = new SslConfigurationFactory();
File keystoreFile=new File("D:\up\ftpserver.jks");
ssl.setKeystoreFile(keystoreFile);
ssl.setKeyPassword("password");
SslConfiguration sc=ssl.createSslConfiguration();
factory.setSslConfiguration(sc);
factory.setServerAddress("127.0.0.1");
factory.setImplicitSsl(true);
serverFactory.addListener("default", factory.createListener());
//serverFactory.setUserManager(ftpService.userManager());
FtpServer server = serverFactory.createServer();

        server.start();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

}
启动时一直报错
log4j:WARN No appenders could be found for logger (org.apache.ftpserver.ssl.SslConfigurationFactory).
log4j:WARN Please initialize the log4j system properly.
org.apache.ftpserver.FtpServerConfigurationException: DefaultSsl.configure()
at org.apache.ftpserver.ssl.SslConfigurationFactory.createSslConfiguration(SslConfigurationFactory.java:364)
at FtpServerTest.main(FtpServerTest.java:22)
Caused by: java.lang.NullPointerException
at org.apache.ftpserver.ssl.SslConfigurationFactory.loadStore(SslConfigurationFactory.java:305)
at org.apache.ftpserver.ssl.SslConfigurationFactory.createSslConfiguration(SslConfigurationFactory.java:326)
... 1 more

[/code]

[quote]
[code="java"]
KeyStore store = KeyStore.getInstance(storeType);
store.load(fin, storePass.toCharArray());
这里报异常
[/code]
[/quote]
具体是哪个对象空了，我想也应该能调试出来的。

你可以调试一下，看看这里的空指针异常是指什么对象空了，然后再一步一步分析。