Tomcat + mysql servlet

Hi all, I've got some problems to access mysql database while running a servlet with tomcat...can anyone help me?

Perhaps. What are the problems? Can you post the code that isn't working?

Similar Messages

How to combinate JSP+Tomcat+mysql??

Hi,guys. My question is as the above subject.
I have installed JDK, Tomcat, mysql, and my OS is WinXP, I am trying to develop a JSP site in my computer.
For JDK, the commands javac, java, ...... work OK;
For Tomcat, http://localhost:8080 works OK, meaning the cat page appears.
For mysql, I can login, and sql statements work OK;
And I download mysql-connector-java-3.1.8a.
What I should do further to combinate JSP+Tomcat+mysql, so my JSP site can work? Any advice?
I need help.
Thanks in advance!

Thanks,duffymo!
As you said, I am learning more about those things.
Actually I am trying to open a JSP webpage to show the connection JSP+Tomcat+mysql works OK.
I copied the mysql-connector-java-3.1.8-bin.jar to ...Tomcat 5.0\common\lib,
created a datebase, named test in MySQL, and wrote a JSP as the below:
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page language="java" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%@ page import="java.sql.*" %>
<%
//driver
String driverName="com.mysql.jdbc.Driver";
//username
String userName="test";
//code
String userPasswd="123";
//database
String dbName="test";
//table name
String tableName="mytab";
//connection string
String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPasswd;
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection connection=DriverManager.getConnection(url);
Statement statement = connection.createStatement();
String sql="SELECT * FROM "+tableName;
ResultSet rs = statement.executeQuery(sql);
ResultSetMetaData rmeta = rs.getMetaData();
int numColumns=rmeta.getColumnCount();
// output
out.print("id");
out.print("|");
out.print("num");
out.print("<br>");
while(rs.next()) {
out.print(rs.getString(1)+" ");
out.print("|");
out.print(rs.getString(2));
out.print("<br>");
out.print("<br>");
out.print("successful!");
rs.close();
statement.close();
connection.close();
%>
How can I test the connection JSP+Tomcat+mysql works OK?
Thanks again!

Tomcat Java Servlets, how to log System.out.println() messages

I have recently installed a new (x86) Mac OS Xserve, and am porting some Java application Servlets from an existing older Mac OSX server. All the servlets were working (I am connecting via port 9006). I have carefully used the old JDK 1.4 compiler, edited my server.xml (for port 9006) and web.xml files, etc. The Tomcat example servlets work fine, and all my (other) servlets work fine, with one exception, where I get the typically vague "java.io.IOException: Server returned HTTP response code: 500" message.
Trouble is, I cannot get the Java System.out.prinln statements to go to the Tomcat/logs/ log files (they are all there and updating with Tomcat HttpServlet messages), in order to properly debug.
Is there a server.xml value somewhere I can make the change?
On another minor (possibly related) point, does anyone know what the path info ='null' means in the Tomcat access log? e.g.,
StandardContext[/my_servlets]: Mapped to servlet 'myServlet' with servlet path '/myServlet' and path info 'null'
It is the only other suspicious message I get in all the logs.
One other point: my java application that fails uses threads. All the individual classes that use the threads work when run interactively, but as soon as I call them from final Serlet class that extends HttpServlet, I get a null pointer exception. Is there something unique about the Tomcat 4.1 threading that could be causing it?
I want to avoid upgrading to Tomcat 5 at this point, if I can avoid it. My applications are modest in scope, and the last time I upgraded to Tomcat 5, it took me days to get it working properly, and I lost all access to it from the Server Admin application.

I have found a solution: Via the Tomcat Admin web page I set the Context field "Swallow Output" to "true".

Tomcat / MySQL problem

Simple Tomcat / MySQL code works well on the development server (Windows) but crashes on the production server (Linux).
It finds and loads the driver, then fails to create a connection with
java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve)Driver is mysql-connector-java-3.0.14-production-bin.jar in ${catalina.home}/common/lib.
MySQL is version 3.23.58.
Tomcat version 4.1.29.
Java version 1.4.2_02.
Operating system is RedHat 9 with Plesk 7.
This looks like a Tomcat security issue but catalina.policy grants all permissions to ${catalina.home}/common/lib/-.
Granting specific permissions has made no difference:
grant codeBase "file:${catalina.home}/common/lib/mysql-connector-java-3.0.14-production-bin.jar" {
permission java.net.SocketPermission "localhost:3306", "listen,connect,accept,resolve";
};The code is straight from the Java tutorial, presented three ways:
1. in a bean, called from a JSP
2. inline in a JSP
3. in a JAR, as an executable class
All of these work in Windows. Only No 3 works in Linux (which suggests the issue is not with Java security). Other JSP pages work fine.
I have not found a MySQL driver preinstalled on the system. I first added mysql-connector-java-3.1.10-bin.jar but this failed because it could not read charset mappings. I have
now reverted to mysql-connector-java-3.0.14-production-bin.jar. Adding the JAR in application/WEB-INF/lib does not help.
I wonder if there is a class loader issue but I cannot find any other JARs that conflict.
Could Tomcat be trying to connect on a different port? It makes no difference whether or not the port number (3306) is included in the URL.
Granting permissions for IP addresses and domain names makes no difference (so far). Besides, the error message is specific about localhost.
Can anyone help, please?
Many thanks
Robin

Spot on! I am not at all clear whether the root cause of the problem is Tomcat, MySQL, Java or whatever ... Until I understand more, everything is suspect.
I have been asking myself what can cause this Access denied / SocketPermission error?
- mis-configuration of the permission: codebase, url, port ?
- in the wrong policy file? catalina.policy or java.policy ?
- faulty installation of something?
- incompatible versions ?
The code all works well on the development machine, which runs Windows 2000. Running it on the Linux machine causes problems.
I do not have full control of the configuration of the Linux machine but I am able to restart Tomcat when needed.
Some specific questions:
I know from the stack trace which Java function is being called:
java.sql.DriverManager.getConnection()The MySQL driver is checking for socket permission when it tries to get a connection and throws:
java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve) - How do I tell what parameters are being passed to getConnection() without installing the source code?
- How do I tell for sure which policy file governs the check?
Many thanks
Robin

Tomcat ?& servlet

Hi,
I am new to tomcat and servlet and dont know how to execute servlets in tomcat3.3. I have saved my servlet files in webapps\examples\web-inf\classes but when I try to run the servlet in browser I get the error messgae page not found. Please help
thanks

have u configured your servlet in web.xml in ..\webapps\examples\web-inf ?? you need to add your servlet name and servlet class at least there? see the web.xml file provided in ..examples\web-inf
regards,
Padmanava

How to create ShoppingCart By Using mysql+Servlet+Html

Hi everyone:
I am working on a project using Jbuilder, which is a shopping site.
The functions are:
1, Access database and display all kinds of products in a table
2, Add the item you want into a Temporary Cart
3, Remove unwanted items from cart
4, Confirm the order
I can only use mysql + Servlet + Html.
I am at the step of display everything from the database, but i don't have any idea how to do the rest of the functions.
i have read lots of information, it seems that i need to use session tracking, and connection pool stuff.
Can any one give me some suggestions about how to design this project and how to implement it, and what kinds of thing i need to aware of.
cheers
Lin

Hi,
i have idea about ur app in different env i.e. in different servers but i don't know how it will impl in jbuilder.i will send u link of whole shop app and also u can refer the wrox books and site.

Tomcat loading servlet ..twice..

Hello,
I have a web application in which I am facing one wiered pbm. I see tomcat loading servlet twice , on which my application logic is failing and quits.
Getting below error in log file.
My findings : One thing I did was , inside comp folder I made a copy of website folder and renamed it to website_old. Now both folders contains servlet.jar. Will it be causing a pbm???
==========================================================
Jan 29, 2009 10:48:34 AM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(.\comp\website_old\WEB-INF\lib\servlet.jar) - jar no
t loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
==========================================================
Ani

One more findings :
I have
Server.xml has an entry of below
<Context docBase="C:\Program Files\Avaya/comp/website" path="/website" reloadable="false" crossContext="true" />
So tomcat should look for website folder in the specified directory, but in the C:\Program Files\Avaya/comp directory, there are two directories , website and website_old.
Why tomcat is searching for C:\Program Files\Avaya/comp/website_old application if it gets the C:\Program Files\Avaya/comp/website . ??
I have tomcat6.
Any reason??

Problem in jdbc-tomcat-mysql connection

hi everybody
i m in serious problem since last 15-20 days. i m trying hard to make the connection jdbc-mysql using tomcat with the help of a jsp test page but every time i am facing almost the similar probems listed below in detail:
to make sure that the jdrivers's .jar (mysql-connector-java-3.1.7-bin.jar) available for such connections working fine i have tried the above said connection without using tomcat....which is working fine...for this i have created a dummy database with a dummy table ..and written some queries in the .java file of my code which upon running inserts the specified values in the defined(dummy) database.
this is the confirmation that the classpath etc..are ok in regard to the mysql-connector-java-3.1.7-bin.jar
now i have placed a copy of this .jar file in to the commons/lib directory of the tomcat web server(which is suppossed to be the place for such external jars)
after doing so i have followed 2 methods :
method 1st:........
i have made aone more jar file from the following .java file....
import javax.naming.*;
import javax.sql.*;
import java.sql.*;
public class TestSQLLoad
String user = "Not Connected";
String pwd = "no pwd";
int id = -1;
public void init() {
try{
Context ctx = new InitialContext();
if(ctx == null ) {
throw new Exception("Boom - No Context");
DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/TestDB");
if (ds != null) {
Connection conn = ds.getConnection();
if(conn != null) {
user = "Got Connection "+conn.toString();
Statement stmt = conn.createStatement();
String q = "select name, password, id from user";
ResultSet rst = stmt.executeQuery(q);
if(rst.next()) {
user=rst.getString(1);
pwd=rst.getString(2);
id = rst.getInt(3);
conn.close();
}catch(Exception e) {
e.printStackTrace();
public String getUser() {
return user;
public String getPassword() {
return pwd;
public int getID()
return id;
after compiling it at the cmd prompt i made a .jar file from the .class of it and named it MySQLLoad.jar...then i placed it also in to the commons/lib directory where the mysql-connector-java-3.1.7-bin.jar was already placed.
then i have changed the server.xml and web.xml files from the conf directory of the tomcat as given here:
server.xml



<Server port="8005" shutdown="SHUTDOWN">

<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />

<GlobalNamingResources>

<Environment name="simpleValue" type="java.lang.Integer" value="30"/>

<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>


<Service name="Catalina">


<Connector
port="80" maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />

     



<Connector port="8009"
enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />






<Engine name="Catalina" defaultHost="localhost">




<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>







<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">









<Context path="/testdb" docBase="TOMCAT_HOME/webapps/tomcat-docs/testdb"
debug="5" reloadable="true" crossContext="true" >
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_DBTest_log." suffix=".txt"
timestamp="true"/>
<Resource name="jdbc/TestDB"
auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/TestDB">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>

<parameter>
<name>maxActive</name>
<value>10</value>
</parameter>

<parameter>
<name>maxIdle</name>
<value>5</value>
</parameter>

<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>

<parameter>
<name>username</name>
<value>root</value>
</parameter>
<parameter>
<name>password</name>
<value>mysql</value>
</parameter>

<parameter>
<name>driverClassName</name>
<value>com.mysql.jdbc.Driver</value>
</parameter>

<parameter>
<name>url</name>
<value>jdbc:mysql://localhost/testdb?autoReconnect=true</value>
</parameter>
</ResourceParams>
</Context>
</Host>
</Engine>
</Service>
</Server>
and the other xml file i.e
web.xml is here:
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
















































<servlet>
<servlet-name>default</servlet-name>
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/TestDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<init-param>
<param-name>listings</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>












<servlet>
<servlet-name>invoker</servlet-name>
<servlet-class>
org.apache.catalina.servlets.InvokerServlet
</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>










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Look at the URl below:
How to connect to Microsoft SQL server with Type 4 JDBC driver
http://www.java-tips.org/content/view/615/29/

JSP/Tomcat/MySQL

Hello JSP developers!
I have a problem trying to connect to MySQL database when I am doing a JSP or a servlet. I think the problem has to be with Tomcat, because when I do a java application with a database connection works perfectly, so there must be Tomcat.
I am working with Java j2sdk1.4.0 and Netbean as my IDE. When I compile the JSP under the IDE does not give me any errors but when I try to see the result with Tomcat 4.0 does not seem to recognize the mm.mysql driver and gives me the following errors:
Generated servlet error:
D:\Apache Tomcat 4.0\work\localhost\_\JspMySQL$jsp.java:75: Class org.apache.jsp.Connection not found.
Generated servlet error:
D:\Apache Tomcat 4.0\work\localhost\_\JspMySQL$jsp.java:76: Class org.apache.jsp.ResultSet not found.
ResultSet results;
It gives me more errors, related to the connection. If you are willing to help me I can send you the exception report that Tomcat generates.
I would really appreciate if you help me about this issue, because I am beginnig to get frustated.
Thanks!!!!

It appears that your JspMySQL.jsp does not import the java.sql package. Try adding the following line at the top of the JSP:
<%@ page import="java.sql.*" %>

Data Sources (Tomcat) - mysql

I tried setting up a Data Source in Tomcat to use a mysql driver, but couldn't get it to work (my Servet wasn't able to find it using a context lookup). I got told by someone that Tomcat had a problem with Data Sources.
So I placed the mm.mysql.jar file into Tomcat's /common/lib/ and am now using the drivers directly like this;
ClassLoader cl = this.getClass().getClassLoader();
Class.forName("org.gjt.mm.mysql.Driver", true, cl).newInstance();
conn = DriverManager.getConnection("jdbc:mysql://xxx.xxx.no/dbname?user=xxx&password=xxxx");It works fine,
but I'm wondering if this will cause problems for me later? What about connection pooling etc. that I had to specify when setting up the data source in Tomcat.

PROGRESS !!
Initial problem
To set up a connection with DataSource by following
JWSDP-1.0 tutorial on Servlet's
I set up a connection with DriverManager by following
http://www-106.ibm.com/developerworks/java/library/j-banner/?dwzone=java
I set up a connection with DataSource by following
-- TOMCAT 4.1.12 > DOCUMENTATION > JNDI DataSource Howto
My guessing thought is that the root cause might be a mysql-configuration theme ..
for example, to configure
"javauser@localhost identified by 'javadude' "
actually GIVES acces,but if you try
c:>mysql -u javauser -pjavadude
I get denied acces ..!?

Error in Tomcat with Servlet

Hi,
I made a webapplication in JBuilder. When I run the project it runs just fine, even when I type the URL http://localhost:8080/webshop/file.shtml in explorer. Very simple.
I installed the project war file in tomcat with the manager and tomcat made a webshop dir in web-app. This dir contains all the files needed for Tomcat to run a web-app
I configured the web.xml, it looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>dbservlet</servlet-name>
<servlet-class>webwinkel.DBServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>dbservlet</servlet-name>
<url-pattern>/dbservlet</url-pattern>
</servlet-mapping>
</web-app>
But the web-app doens't run online. When I try to reach the servlet I get a 404. Tomcat can't find the servlet. Am I forgetting something here, if it runs local in JBuilder shouldn't it just as easy run on a webserver?
please help I'm desperate
Susan

looks like you should be pointing to the following url to get to your servlet:
http ://localhost:8080/webshop/dbservlet
Is this what you or your form is pointing to? Are you able to get to /file.shtml but not the servlet?

Creator Tomcat MySQL Deployment Table Not being filled by DB

Hi All,
I am deploying a Creator app called test3.war which uses a MySQL db called RemoteFocalPoint.
When I try to browse to the url : http://65.99.196.145:8080/test3/ The page wont load I have also had the error JasperException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
I can get the table to be filled from the RemoteFocalPoint db on a sun pointbase server running locally with the following parameters :
Data Source Name : RemoteFocalPoint
User ID : root
Password ; ****************
Data base URL jdbc:mysql://65.99.196.145/RemoteFocalPoint
Driver Class : org.gjt.mm.mysql.Driver
Validation table : Validation
I have installed Tomcat Administrator for the production Tomcat (v5.5) environment.
The settings I have on Tomcat Administrator for http://65.99.196.145:8080/test3/ are
JNDI Name: jdbc/RemoteFocalPoint
Data Source URL: jdbc:mysql://localhost/RemoteFocalPoint
JDBC Driver Class: org.gjt.mm.mysql.Driver
User name jim
Password *****************
Max. Active Connections: 4
Max. Idle Connections: 2
Max. Wait for Connection: 5000
Validation Query: SELECT ALL VALIDATION.Test FROM VALIDATION
If anyone could shed any light on this I would be grateful. There is a lot of contradictory information on the web about this issue.
Regards
Jim Ascroft

I think that his has been answered better than I can elsewhere in the forum and
on the web. It's something that people frequently run into.
But effectively, I think you need to edit a <project>/web/META-INF/context.xml
file, adding something like this:
(replace "oms" with your project name).
Unfortnately, posting xml just doesn't work for me, but you ought to be able to google
for context.xml, tomcat, resource and maybe database.
I believe Dion Almaer has a post in his blog about it.
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/oms" >
<Resource
        auth="Container"
        description="Nrg database"
        name="postgres/nrgdb"
        type="javax.sql.DataSource"
        driverClassName="org.postgresql.Driver"
        url="jdbc:postgresql://localhost/nrgdb"
        username="dms"
        password=""
        maxIdle="2"
        maxWait="5000"
        validationQuery="select * from users;"
        maxActive="4"
        removeAbandoned="true"
        removeAbandonedTimeout="30"
        logAbandoned="true"
    />
<WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>META-INF/context.xml</WatchedResource>
</Context>

Using Weblogic ACL from Tomcat in Servlet/SJP

Hi all,
I'm trying to use weblogic ACL from a servlet in a remote Servlet/JSP
container (Tomcat). I've managed to log a user as decribed is the
"examples.security.acl.Client exemple" but what i need now is to be able to
get back the user group and/or permissions. Does anyone have done this
before ? I've look in the Weblogic documentation center but I did not manage
to found any exemple.
Thank you in advance.
Frederic

Sorry, but I believe you are going to be limited to the information
available through the JNDI interface and the interfaces of the EJB's that
you deploy to the weblogic EJB container. The ACL information is intended
for use only within the scope of the server environment. So, even though you
are running as a Servlet/JSP you're running in the Tomcat container which is
actually outside the weblogic Servlet/JSP or EJB container(s), in essance
you're running under the same access limitiations as an EJB client app.
BTW, you do realize that the weblogic 6.0 server does include a very nice
Servlet/JSP container?
Alfred Wallace <[email protected]> wrote in message
news:3a9fbc66$[email protected]..
Hi all,
I'm trying to use weblogic ACL from a servlet in a remote Servlet/JSP
container (Tomcat). I've managed to log a user as decribed is the
"examples.security.acl.Client exemple" but what i need now is to be ableto
get back the user group and/or permissions. Does anyone have done this
before ? I've look in the Weblogic documentation center but I did notmanage
to found any exemple.
Thank you in advance.
Frederic

Tomcat recompiling servlets

While I am still making changes to a servlet code, how can I make a servlet reload every time I test it?
Mani

http://tomcat.apache.org/tomcat-5.5-doc/config/context.html
Check out the "reloadable" attribute. That's as close as you can get.

Tomcat and servlet

hi to all... i've configured my tomcat 6.0 for the deployment of servlet but i always get a 404 error, servlet not available...
environment variables:
classpath has been pointed to servlet-api.jar ans jsp-api.jar
java_home set to point to jdk folder
configuration of tomcat:
conf/web.xml: uncomment servlet/* and its corresponding servlet mapping
conf/context.xml: set reloadable="true"
still when i do all of this nothing works! even my html pages! error page not found...
whats the problem?
plz help with the configuration of tomcat
heartful thx

I am having the same problem. I tried exactly like an example of a book.
Then i read this thread and I tried to load the examples that come with tomcat.
http://localhost:8080/servlet-examples/servlet/HelloWorldExample
And it�s not working. It works only .html files, for example:
http://localhost:8080 -> opens the tomcat homepage
http://localhost:8080/jspbook/index.html ->opens my example
my project looks like this(inside the webapps) /jspbook/ WEB-INF ; build.xml ; index.html
/jspbook/WEB-INF/ web.xml ; classes
/jspbook/WEB-INF/classes/com/jspbook/HelloWorld.java
My web.xml got:
<servlet>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>com.jspbook.HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
Then I try to acess it
http://localhost:8080/jspbook/hello
and I get 404. the resource is no available
Who can help me?

Tomcat + mysql servlet

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