我正在使用带有 JSF、EJB 和 JPA 的 Netbeans 创建一个登录界面。当我尝试部署项目时,它会引发以下异常:
Internal Exception: java.sql.SQLException:
Error in allocating a connection. Cause: Connection could not be allocated because: User id length (0) is outside the range of 1 to 255.
Error Code: 0. Please see server.log for more details.
C:\Users\Dell\Desktop\assignmenttask2\nbproject\build-impl.xml:1033: The module has not been deployed.
See the server log for details.
这是如何引起的,我该如何解决?