So I'm starting a web application and I want to use JSP pages (I've used them before) to access dynamically to the database and retrieve data from different tables.
I have by now a basic DatabaseHelper class, an App class that only tests the DB helper connection and a simple query, and a jsp file. The problem I'm facing is that the Database connection works great if run from the App.java class, but if I run it from the JSP file it will throw a SQLException saying it didn't find a suitable driver. (I'll leave code and error message below)
I've tried different options I've read here in StackOverflow and other pages: I put the driver in the server's classpath, in the WEB-INF/lib, in the project's build path as external JAR (this one works for the Java app class mentioned before)...
And here is the environment:
Database: Microsoft SQL Server 2017
Driver: sqljdbc42.jar
Server: Glassfish 4.0
IDE: Eclipse Oxygen.3
So any hint on how can I solve this problem and use the Database helper from the jsp file will be happily welcome.
Thanks!
Error message:
[2018-03-28T12:39:48.883+0200] [glassfish 4.0] [SEVERE] [] [pl.mais.db.DBHelper] [tid: _ThreadID=21 _ThreadName=http-listener-1(3)] [timeMillis: 1522233588883] [levelValue: 1000] [[
java.sql.SQLException: No suitable driver found for jdbc:sqlserver://localhost;databaseName=campus_db;user=******;password=*****
at java.sql.DriverManager.getConnection(DriverManager.java:689)
at java.sql.DriverManager.getConnection(DriverManager.java:270)
at pl.mais.db.DBHelper.open(DBHelper.java:41)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:58)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:748)
]]
App.java
package pl.mais.general;
import pl.mais.db.DBHelper;
public class App {
public static void main (String[] args) {
DBHelper db = new DBHelper();
db.open();
db.testSelectFaculties();
db.close();
}
}
DBHelper.java
package pl.mais.db;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author sergi
*
*/
public class DBHelper {
// JDBC driver name and database URL
private final String JDBC_DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
private final String DB_URL = "jdbc:sqlserver://localhost;databaseName=campus_db;";
// Database credentials
private static final String DB_USER = "*****";
private static final String DB_PASS = "*****";
private Connection conn = null;
private Statement stmt = null;
public DBHelper() {
try {
Class.forName(JDBC_DRIVER);
} catch (Exception e) {
e.printStackTrace();
}
}
public void open() {
try {
String connectionUrl = DB_URL + "user=" + DB_USER + ";password=" + DB_PASS;
//System.out.println("Connecting to database...");
conn = DriverManager.getConnection(connectionUrl);
//System.out.println("Creating statement...");
stmt = conn.createStatement();
} catch (SQLException ex) {
Logger.getLogger(DBHelper.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void close() {
try {
stmt.close();
conn.close();
} catch (SQLException ex) {
Logger.getLogger(DBHelper.class.getName()).log(Level.SEVERE, null, ex);
}
}
public String[] testSelectFaculties() {
try {
// Create and execute an SQL statement that returns some data.
String SQL = "SELECT * FROM faculties";
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(SQL);
ArrayList<String> results = new ArrayList<String>();
// Iterate through the data in the result set and display it.
while (rs.next()) {
results.add(rs.getString(1) + " - " + rs.getString(2));
System.out.println(rs.getString(1) + " - " + rs.getString(2));
}
return (String[])results.toArray();
}
catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
index.jsp
<%@page import="pl.mais.db.DBHelper"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
DBHelper db = new DBHelper();
db.open();
String[] faculties = db.testSelectFaculties();
db.close();
for (int i = 0; i < faculties.length; i++) {
%>
<h2>
<%=
faculties[i]
%>
</h2>
<%
}
%>
</body>
</html>
Making the JDBC Driver JAR Files Accessible:
To integrate the JDBC driver into a GlassFish Server domain, copy the JAR files into the domain-dir/lib directory, then restart the server. This makes classes accessible to all applications or modules deployed on servers that share the same configuration.
Source: Oracle documentation.