hibernate错误

log4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
net.sf.hibernate.MappingException: Error reading resource: mypack/Test1.hbm.xml
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:318)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:976)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:928)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:856)
at mypack.BusinessService.<clinit>(BusinessService.java:15)
Caused by: net.sf.hibernate.MappingException: duplicate import: Customer1
at net.sf.hibernate.cfg.Mappings.addImport(Mappings.java:85)
at net.sf.hibernate.cfg.Binder.bindClass(Binder.java:126)
at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:221)
at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1229)
at net.sf.hibernate.cfg.Configuration.add(Configuration.java:249)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:285)
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:315)
... 4 more
Exception in thread "main" java.lang.NullPointerException
at mypack.BusinessService.saveCustomer(BusinessService.java:46)
at mypack.BusinessService.test(BusinessService.java:185)
at mypack.BusinessService.main(BusinessService.java:211)
怎么出现的？
Exception in thread "main" java.lang.UnsupportedOperationException: The user must supply a JDBC connection
at net.sf.hibernate.connection.UserSuppliedConnectionProvider.getConnection(UserSuppliedConnectionProvider.java:32)
at net.sf.hibernate.impl.BatcherImpl.openConnection(BatcherImpl.java:278)
at net.sf.hibernate.impl.SessionImpl.connect(SessionImpl.java:3264)
at net.sf.hibernate.impl.SessionImpl.connection(SessionImpl.java:3244)
at net.sf.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:40)
at net.sf.hibernate.transaction.JDBCTransactionFactory.beginTransaction(JDBCTransactionFactory.java:19)
at net.sf.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:2195)
at mypack.BusinessService.saveCustomer(BusinessService.java:49)
at mypack.BusinessService.test(BusinessService.java:185)
at mypack.BusinessService.main(BusinessService.java:211)
这两个错误都不知道怎么解决