commons.net.ftp.FTPClient为什么不能取出linux服务上的ftp文件列表?

import org.apache.commons.net.ftp.*;FTPClient client = new FTPClient();
client.connect(sms_url);
boolean islogin = client.login(sms_user, sms_pwd);
FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
client.changeWorkingDirectory(sms_path);
client.setFileTransferMode(FTPClient.STREAM_TRANSFER_MODE);
client.setFileType(FTPClient.BINARY_FILE_TYPE);
//以上运行都正确FTPFile[] ftpFile=client.listFiles("message");就抛下面异常：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/oro/text/regex/MalformedPat
ternException
        at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createUnixFTPEntryP
arser(DefaultFTPFileEntryParserFactory.java:169)
        at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createFileEntryPars
er(DefaultFTPFileEntryParserFactory.java:94)
        at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2358)
        at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2141)
        at jpkj.stat.movement.NoteFilterDaily.ftpFromSMS(NoteFilterDaily.java:76)
        at jpkj.stat.movement.NoteFilterDaily.main(NoteFilterDaily.java:92)
请按任意键继续 . . .