求助，我在弄一个jsp的添加内容进数据库，页面500报错

HTTP Status 500 - An exception occurred processing JSP page /admin/control/add.jsp at line 14
type Exception reportmessage An exception occurred processing JSP page /admin/control/add.jsp at line 14description The server encountered an internal error that prevented it from fulfilling this request.exceptionorg.apache.jasper.JasperException: An exception occurred processing JSP page /admin/control/add.jsp at line 1411:  jdbc j=new jdbc();
12:  Connection conn=j.getConnection();
13:  Statement stm=conn.createStatement();
14:  stm.executeUpdate(sql);
15:  out.print("<script>alert('娣诲姞鎴愬姛');location.href='../insert.jsp'</script>");
16: 
17: 
Stacktrace:
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:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root causejavax.servlet.ServletException: java.sql.SQLException: Field 'tp' doesn't have a default value
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:912)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:841)
org.apache.jsp.admin.control.add_jsp._jspService(add_jsp.java:88)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root causejava.sql.SQLException: Field 'tp' doesn't have a default value
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2677)
com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1748)
com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1665)
org.apache.jsp.admin.control.add_jsp._jspService(add_jsp.java:78)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.40 logs.Apache Tomcat/7.0.40