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有什麼可能導致此問題？我在嘗試連接到數據庫時遇到PSQLException
堆棧跟蹤：
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
root cause
javax.servlet.ServletException: org.postgresql.util.PSQLException: Protocol error. Session setup failed.
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:905)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:834)
org.apache.jsp.login_005fsave_jsp._jspService(login_005fsave_jsp.java:149)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
root cause
org.postgresql.util.PSQLException: Protocol error. Session setup failed.
org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:381)
org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:94)
org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:65)
org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:116)
org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:30)
org.postgresql.jdbc3.Jdbc3Connection.<init>(Jdbc3Connection.java:24)
org.postgresql.Driver.makeConnection(Driver.java:369)
org.postgresql.Driver.connect(Driver.java:245)
java.sql.DriverManager.getConnection(DriverManager.java:664)
java.sql.DriverManager.getConnection(DriverManager.java:208)
org.apache.jsp.login_005fsave_jsp._jspService(login_005fsave_jsp.java:107)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)