我在使用schemaCrawler和Oracle Database 10g时遇到了这个异常，有谁知道这是什么意思？
Avertissement: JDBC driver does not support retrieving functions java.lang.AbstractMethodError:
oracle.jdbc.driver.OracleDatabaseMetaData.getFunctions(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/sql/ResultSet; at
schemacrawler.crawl.RoutineRetriever.retrieveFunctions(RoutineRetriever.java:159) at
schemacrawler.crawl.SchemaCrawler.crawlRoutines(SchemaCrawler.java:178) at
schemacrawler.crawl.SchemaCrawler.crawl(SchemaCrawler.java:457) at
work.SchemaCrawlerUtility.getDatabase(SchemaCrawlerUtility.java:20)