[Building Sakai] Build src sakai error

[Phuc Bui]

Dear all, 
I have a problem when building sakai source 2.5.4 (download form sakai'site)
-----------------------
[INFO]
------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO]
------------------------------------------------------------------------
[INFO] Compilation failure
C:\Users\QuocTan\Desktop\THESIS\SAKAI\sakai-src-2.5.4\sam\samigo-services\sr
c\java\org\sak
aiproject\spring\DataSourceWrapperAutoCommit.java:[36,7]
org.sakaiproject.spring.DataSourc
eWrapperAutoCommit is not abstract and does not override abstract method
isWrapperFor(java
.lang.Class<?>) in java.sql.Wrapper
-----------------------
What is the problem ? I have built it once successfully, but now, this error
exist ???
Can you tell me why ?

Thanks
Phuc Bui