Connecting to MySQL from another machine.
I use following code to connect to my database.it works
String databaseUrl = "jdbc:mysql://localhost:3306/test";
but when i use
String databaseUrl = "jdbc:mysql://192.168.0.205:3306/test";{
it gives error (192.168.0.205 being my ip address)
error
message from server : "Host TRAIN5" is not allowed to connect to this MySQL server.
Is that because of my connection string?
It is because of your configuration. It has to do with user permission.
Read the MySQL manual, again (you have read it, haven't you?), and pay close attention to user administration and the "GRANT" statement.
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Connect to mysql in another machine
Hi, there,
I have two database. One is oracle in my local machine, another is mysql in another machine. Now, I made a jsp program to control the two database concurrently. When I connect to mysql, I got errors:
Internal Servlet Error:
javax.servlet.ServletException: Server configuration denies access to data source
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:459)
at jspForOracle._0002fjspForOracle_0002fmodiProcess_0002ejspmodiProcess_jsp_1._jspService(_0002fjspForOracle_0002fmodiProcess
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:177)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:166)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
at java.lang.Thread.run(Thread.java)
My local machine is : Redhat7.1, tomcat and oracle
Mysql machine is : Slackware, tomcat and mysql
I can ping and ssh the mysql machine. And I grant the mysql table for the permission to access the table. But still the same thing. What the problem?
Thank you in advance
peterin your error message:
javax.servlet.ServletException: Server configuration denies access to data source
The server being referred to is the mysql server. Mysql has uid and password like all db's, but in addition, it has security that is sensitive to the source of the connection. Just because you have a valid uid and password doesn't mean that you will be able to connect from anywhere.
This data is in the user table of the mysql database, which is included by default in every mysql installation. What you need to do is edit the privileges of the user account that you're using to connect to mysql from the jsp. There is some good documetation on user administration here:
http://www.mysql.com/documentation/mysql/bychapter/ -
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i can connect with :
sqlplus system/pass@xe
listener and tnsnames are fine
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If your external CD/DVD reader/writer does not support booting your Mac from an OS X install disc and your Mac has Firewire ports and supports Firewire Target Disk mode, you can connnect another Mac with a Firewire port that includes a working CD/DVD module and also supports Firewire Target Disk mode and install a new OS on your Mac from this Mac.
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Dear experts
Is it possible to use APEX for XE from another machine i.e. in the browser address bar can i type http://192.168.0.12:8080/APEX? It does not work for me. would really appreciate any pointers on this
Thanks a lot
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~Dietmar. -
Can you run fcsvr_client from another machine?
has anyone tried running fcsvr_client from another machine:
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can't seem to figure out what they want for a user and pass. i keep getting the following error:
CODE = E_LOGIN, DESC = no valid user identified for this action, SRC_FILE = PmsTask_SearchEntity.C, SRC_LINE = 189
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Thank You
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Re-formatting / erasing a corrupted hard disk from another machine?
Hi there,
I have a macbook pro that was running 10.6.3. The hard disk fell over and for some reason the DVD won't be recognised. When I boot my macbook I get a grey screen with a flashing folder with a question mark in it. I tried to boot to disk utility without luck (pressing command + R didn't bring up the DU). How do I go about reformatting / erasing the disk using another machine (I have another macbook pro running 10.7.5)? I assume once that is done then either the DVD will work properly or I can install from the internet?
Thanks!If you are getting the flashing ? mark then either the drive has failed or the cable that goes from the drive to the logic board has failed. In either case that failed part will need to be replaced.
If the drive failed it has failed and the data on it is irretrievable. You should take the drive out of the older Mac and connect it to the newer Mac with a SATA to USB adapter. If you can read the drive that way then you can copy the data off it and the drive itself hasn't failed, the cable has.
Your Mac running 10.6.x Snow Leopard doesn't have access to the newer Recovery HD system like Mac's running Lion or Mt Lion.
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Python ldap write access (acl) from another machine?
i've downloaded and installed:
http://python-ldap.sourceforge.net/
and used this example code:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/303336
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The search works fine, but add and delete return this error:
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It would appear that the default acl for * doesn't allow for other computers to have write access?
access to *
by set="user/uid & [cn=admin,cn=groups,dc=test,dc=mydomain,dc=com]/memberUid" write
by dn.exact="cn=test.mydomain.com$,cn=computers,dc=test,dc=mydomain,dc=com" write
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by * read
What I don't understand about acls is: are the 'by' lines all additive? if I was to add a new acl like the one below, will that give other computers, when authenticated as someone in the admin group, write access?
It would appear that the default acl for * doesn't allow for other computers to have write access? or commenting out the dn=exact and sockurl?
access to *
by set="user/uid & [cn=admin,cn=groups,dc=test,dc=mydomain,dc=com]/memberUid" write
by * read
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You can check these few text-book style troubleshooting steps :-
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Can't import photos from another machine???
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All the images are in Jpeg format!they are in my iPhoto Library
How did they get there? iPhoto will not import pics from the active iPhoto Library Folder - a protection against duplication. There is never a need for the user to enter that folder and anytime you do you risk damaging your Library.
Regards
TD -
Error when connecting to portal from some machines
Hi all,
Can anyone help me with this.
I get this jserver error when connecting to portal from some
client machines.
I works fine from the others. Any ideas?
This is the error I get:
[08/01/2002 17:41:57:618 GMT+00:00] page/Timeout occurred,
label=73 url=http://odeceixe:81/pls/portal30/!
PORTAL30.wwpro_app_provider.execute_portlet time=15828ms
[08/01/2002 17:41:57:618 GMT+00:00] page/ContentFetcher
Unexpected Exception, name=content-fetcher5
java.io.EOFException: Premature EOF encountered
at HTTPClient.StreamDemultiplexor.read
(StreamDemultiplexor.java, Compiled Code)
at HTTPClient.RespInputStream.read(RespInputStream.java,
Compiled Code)
at java.io.InputStream.read(InputStream.java:95)
at java.io.InputStreamReader.fill
(InputStreamReader.java:163)
at java.io.InputStreamReader.read
(InputStreamReader.java:239)
at oracle.webdb.page.ContentFetcher.run
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Can't connect to MySQL from Oracle 11g R1
Hello Oracle's guru.
Sorry for my English it's not my native langauge
Enviroments: Oracle 11g R1, Windows 7, ODBC Driver 5.1.8
I have a some problem with creation gateway to connection to MySQL, and I hope somebody can help me.
So,
1) ODBC name - MYSQLDSN
2) initMYSQLDSN.ora
# This is a sample agent init file that contains the HS parameters that are
# needed for the Database Gateway for ODBC
# HS init parameters
HS_FDS_CONNECT_INFO = MYSQLDSN
HS_FDS_TRACE_LEVEL = 0
3) listener.ora
# listener.ora Network Configuration File: E:\app\voxa\product\11.1.0\db_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=
(SID_NAME=MYSQLDSN)
(ORACLE_HOME=E:\app\voxa\product\11.1.0\db_1)
(PROGRAM=dg4odbc)
4) tnsnames.ora
# tnsnames.ora Network Configuration File: E:\app\voxa\product\11.1.0\db_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
CXWH =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = CXWH)
MYSQLDSN =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))
(CONNECT_DATA =(SID = MYSQLDSN))
(HS = OK)
Then I trying to connect to MySQL using sql*plus:
C:\Windows\system32>sqlplus
SQL*Plus: Release 11.1.0.6.0 - Production on Ср Июн 1 12:13:39 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
login: system
pass:
Connect to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> create public database link MYSQLDSN
2 connect to DEMO identified by "DEMO" using 'MYSQLDSN';
Channel was created
SQL> select * from items@MYSQLDSN;
select * from items@MYSQLDSN
Error in line 1:
ORA-28500: connection with ORACLE with other system return message:
[MySQL][ODBC 5.1 Driver][mysqld-5.5.12]You have an error in your SQL syntax;
check the manual that corresponds to your MySQL server version for the right
syntax to use near
'"ITEMS_KEY",A1."ITEM_NAME",A1."ITEM_CATEGORY",A1."ITEM_VENDOR",A1."ITEM_SKU",A1
.' at line 1
ORA-02063: предшествующий 2 lines из MYSQLDSN
If I trying create new ODBC mobule via OWB, I had next error:
[MySQL][ODBC 5.1 Driver][mysqld-5.5.12]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '"DUAL"' at line 1
ORA-02063: предшествующий 2 lines из OWB_56
What I do wrong? Please help meHi,
You can download the 11.1.0.7 patchset from My Oracle Support -
support.oracle.com
as patch 6890831.
Once logged in click on 'Patches and Updates' and enter the patch number as 6890831 and choose whichever platform you are running.
the readme explains how to apply the patch to an existing 11.1.0.6 install.
The url you posted is only for complete product installs, but 11.1.0.7 is only a patchset that must be applied to an existing install.
Regards,
Mike -
Connecting to MySQL from Sun One Studio
Hi,
I am trying to connect to the MySQL from the Sun One Studio 5. I followed these steps.
1. I downloaded the MySQL software and installed on my local computer, it was successful.
2. I got the drivers [b][b][b]mysql-connector-java-3.0.8-stable-bin.jar and placed it in the <stdudio5>/lib/ext/ directory.
3. And I successfully got through that one also, and in the database section it showed me the icon for connecting to mysql database. I gave the url, username, and password. It worked fine.
4. Then I created the connection pool, JDBC resource, and Persistence manager for my server instance. It was also successful.
5. When I built a cmp bean accessing the table in mySQL database, it is giving me these errors.
If you notice these error, it is asking for vendor type. But i don't have any option to choose the vendor type when i configured the database resources.
Can soem body suggest some other method and clear this error. I am struggling with this since a week.
Thank you.
[[b]09/Oct/2003:11:12:31] WARNING ( 3476): Cannot get database metadata: database product name.
java.sql.SQLException: com.sun.enterprise.repository.J2EEResourceException
java.lang.ClassNotFoundException: org.gjt.mm.mysql.jdbc2.optional.MysqlDataSource
at com.sun.enterprise.resource.SystemJdbcDataSource.internalGetConnection(SystemJdbcDataSource.java:252)
at com.sun.enterprise.resource.SystemJdbcDataSource.getConnection(SystemJdbcDataSource.java:154)
at com.sun.jdo.spi.persistence.support.sqlstore.ejb.TransactionHelperImpl.getConnection(TransactionHelperImpl.java:171)
at com.sun.jdo.spi.persistence.support.sqlstore.ejb.EJBHelper.getConnection(EJBHelper.java:169)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getDBName(SQLPersistenceManagerFactory.java:781)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getFromPool(SQLPersistenceManagerFactory.java:709)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getPersistenceManager(SQLPersistenceManagerFactory.java:598)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:770)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:660)
at JAdminEntityBeans.JobinfoBean_1956195957_ConcreteImpl.jdoGetPersistenceManager(JobinfoBean_1956195957_ConcreteImpl.java:1479)
at JAdminEntityBeans.JobinfoBean_1956195957_ConcreteImpl.ejbFindByTitle(JobinfoBean_1956195957_ConcreteImpl.java:541)
at JAdminEntityBeans.JobinfoBean_1956195957_ConcreteImpl_RemoteHomeImpl.findByTitle(JobinfoBean_1956195957_ConcreteImpl_RemoteHomeImpl.java:175)
at JAdminEntityBeans._JobinfoHome_Stub.findByTitle(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.forte4j.j2ee.ejbtest.webtest.InvocableMethod$MethodIM.invoke(InvocableMethod.java:231)
at com.sun.forte4j.j2ee.ejbtest.webtest.EjbInvoker.getInvocationResults(EjbInvoker.java:96)
at com.sun.forte4j.j2ee.ejbtest.webtest.DispatchHelper.getForward(DispatchHelper.java:189)
at jasper.dispatch_jsp._jspService(_dispatch_jsp.java:136)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)
[09/Oct/2003:11:12:31] INFO ( 3476): Bean Jobinfo method ejbFindByTitle: problems running JDOQL query.
com.sun.jdo.api.persistence.support.JDOFatalInternalException: Failed to get the vendor type for the data store.
NestedException: java.sql.SQLException: com.sun.enterprise.repository.J2EEResourceException
java.lang.ClassNotFoundException: org.gjt.mm.mysql.jdbc2.optional.MysqlDataSource
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getDBName(SQLPersistenceManagerFactory.java:802)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getFromPool(SQLPersistenceManagerFactory.java:709)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getPersistenceManager(SQLPersistenceManagerFactory.java:598)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:770)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:660)
at JAdminEntityBeans.JobinfoBean_1956195957_ConcreteImpl.jdoGetPersistenceManager(JobinfoBean_1956195957_ConcreteImpl.java:1479)
at JAdminEntityBeans.JobinfoBean_1956195957_ConcreteImpl.ejbFindByTitle(JobinfoBean_1956195957_ConcreteImpl.java:541)
at JAdminEntityBeans.JobinfoBean_1956195957_ConcreteImpl_RemoteHomeImpl.findByTitle(JobinfoBean_1956195957_ConcreteImpl_RemoteHomeImpl.java:175)
at JAdminEntityBeans._JobinfoHome_Stub.findByTitle(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.forte4j.j2ee.ejbtest.webtest.InvocableMethod$MethodIM.invoke(InvocableMethod.java:231)
at com.sun.forte4j.j2ee.ejbtest.webtest.EjbInvoker.getInvocationResults(EjbInvoker.java:96)
at com.sun.forte4j.j2ee.ejbtest.webtest.DispatchHelper.getForward(DispatchHelper.java:189)
at jasper.dispatch_jsp._jspService(_dispatch_jsp.java:136)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)The AS7 error suggests that you have not set up the server startup classpath to include the driver jar. The steps to do this are included in the article mentioned in Chris's reply, namely:
http://developers.sun.com/tools/javatools/tips/tip03-08-22.html
Note especially the part starting with Step 3 under the section "Enabling the JDBC Driver in the IDE."
-Jane -
Problem to connect to mysql from servlet using a javabean
Hi,
I'm new here and beginner on java to.
I have problem to connect to MySql database, by a connection javabean.
It's the following: a HTML page calls a servlet and this servlet imports the package connection javabean.
It has no problem when I establish the connection inside the servlet, with all its methods (public and private). But i want to separate the code connection from servlet.
Detail: there is no problem, using the javabean to connect to MS Access database.
I put "mysql-connector-java-3.1.12-bin.jar" file inside WEB-INF/lib application and common/lib directories.
I set the classpath:
SET CLASSPATH=%CATALINA_HOME%\COMMON\LIB\mysql-connector-java-3.1.12-bin.jar;%CLASSPATH%
I think that the servlet cannot create an instance of javabean, because passed by catch exception of the servlet init method.
But I don't know why.
Please Why?
Below there are the fragment of errors, servlet code e javabean code.
Thank you.
Zovao.
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
at CadServletFileBeanConexArq.doPost(CadServletFileBeanConexArq.java:47)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:716)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
Note: The line 47 is calling insertIntoDB javabean method.
========///////////////===============
// Here is the servlet CadServletFileBeanConexArq.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.sql.*;
import conJdbc.*;
public class CadServletFileBeanConexArq extends HttpServlet {
public ConexPed connect = null;
private String driver = "com.mysql.jdbc.Driver";
private String URL = "jdbc:mysql://localhost:3306/cadastro";
public void init( ServletConfig config )
throws ServletException
super.init( config );
try
connect = new ConexPed(driver, URL, "monty", "some_pass");
catch ( Exception e )
e.printStackTrace();
connect = null;
public void doPost( HttpServletRequest req,
HttpServletResponse res )
throws ServletException
boolean success = true;
String email, nome, sobrenome, produto, valor;
email = req.getParameter( "Email" );
nome = req.getParameter( "Nome" );
sobrenome = req.getParameter( "Sobrenome" );
produto = req.getParameter( "Produto" );
valor = req.getParameter( "Valor" );
res.setContentType( "text/html" );
if ( email.length() > 0 && nome.length() > 0 && sobrenome.length() > 0 && valor.length() > 0 )
/* inserting data */
success = connect.insertIntoDB(
"'" + email + "','" + nome + "','" + sobrenome + "','" + produto + "'", Double.parseDouble(valor) );
//closing connection
public void destroy()
connect.fecharConexao();
=============///////////////============
Here is the JavaBean.
package conJdbc;
import java.sql.*;
public class ConexPed
public Connection connection;
public Statement statement;
public ConexPed (String driver, String urlServidor, String user, String password)
try
Class.forName(driver);
connection = DriverManager.getConnection(urlServidor,user,password);
catch (ClassNotFoundException ex)
System.out.println("N�o foi poss�vel encontrar a classe do Driver: " + driver);
catch (SQLException ex)
System.out.println("N�o foi poss�vel conectar ao servidor");
try
statement = connection.createStatement();
catch (SQLException ex)
System.out.println("N�o foi poss�vel criar a statement");
*Inserting data to database
public synchronized boolean insertIntoDB( String stringtoinsert, double valor)
try
statement.executeUpdate( "INSERT INTO pedido values (" + stringtoinsert + " , " + valor + ");" );
catch ( Exception e ) {
System.err.println(
"ERROR: Problemas ao adicionar nova entrada" );
e.printStackTrace();
return false;
return true;
* Close statement.
public void fecharStatement()
try
statement.close();
catch (SQLException ex)
ex.printStackTrace();
* close database
public void fecharConexao()
try
connection.close();
catch (SQLException ex)
ex.printStackTrace();
}Hi,
I'm new here and beginner on java to.
I have problem to connect to MySql database, by a connection javabean.
It's the following: a HTML page calls a servlet and this servlet imports the package connection javabean.
It has no problem when I establish the connection inside the servlet, with all its methods (public and private). But i want to separate the code connection from servlet.
Detail: there is no problem, using the javabean to connect to MS Access database.
I put "mysql-connector-java-3.1.12-bin.jar" file inside WEB-INF/lib application and common/lib directories.
I set the classpath:
SET CLASSPATH=%CATALINA_HOME%\COMMON\LIB\mysql-connector-java-3.1.12-bin.jar;%CLASSPATH%
I think that the servlet cannot create an instance of javabean, because passed by catch exception of the servlet init method.
But I don't know why.
Please Why?
Below there are the fragment of errors, servlet code e javabean code.
Thank you.
Zovao.
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
at CadServletFileBeanConexArq.doPost(CadServletFileBeanConexArq.java:47)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:716)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
Note: The line 47 is calling insertIntoDB javabean method.
========///////////////===============
// Here is the servlet CadServletFileBeanConexArq.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.sql.*;
import conJdbc.*;
public class CadServletFileBeanConexArq extends HttpServlet {
public ConexPed connect = null;
private String driver = "com.mysql.jdbc.Driver";
private String URL = "jdbc:mysql://localhost:3306/cadastro";
public void init( ServletConfig config )
throws ServletException
super.init( config );
try
connect = new ConexPed(driver, URL, "monty", "some_pass");
catch ( Exception e )
e.printStackTrace();
connect = null;
public void doPost( HttpServletRequest req,
HttpServletResponse res )
throws ServletException
boolean success = true;
String email, nome, sobrenome, produto, valor;
email = req.getParameter( "Email" );
nome = req.getParameter( "Nome" );
sobrenome = req.getParameter( "Sobrenome" );
produto = req.getParameter( "Produto" );
valor = req.getParameter( "Valor" );
res.setContentType( "text/html" );
if ( email.length() > 0 && nome.length() > 0 && sobrenome.length() > 0 && valor.length() > 0 )
/* inserting data */
success = connect.insertIntoDB(
"'" + email + "','" + nome + "','" + sobrenome + "','" + produto + "'", Double.parseDouble(valor) );
//closing connection
public void destroy()
connect.fecharConexao();
=============///////////////============
Here is the JavaBean.
package conJdbc;
import java.sql.*;
public class ConexPed
public Connection connection;
public Statement statement;
public ConexPed (String driver, String urlServidor, String user, String password)
try
Class.forName(driver);
connection = DriverManager.getConnection(urlServidor,user,password);
catch (ClassNotFoundException ex)
System.out.println("N�o foi poss�vel encontrar a classe do Driver: " + driver);
catch (SQLException ex)
System.out.println("N�o foi poss�vel conectar ao servidor");
try
statement = connection.createStatement();
catch (SQLException ex)
System.out.println("N�o foi poss�vel criar a statement");
*Inserting data to database
public synchronized boolean insertIntoDB( String stringtoinsert, double valor)
try
statement.executeUpdate( "INSERT INTO pedido values (" + stringtoinsert + " , " + valor + ");" );
catch ( Exception e ) {
System.err.println(
"ERROR: Problemas ao adicionar nova entrada" );
e.printStackTrace();
return false;
return true;
* Close statement.
public void fecharStatement()
try
statement.close();
catch (SQLException ex)
ex.printStackTrace();
* close database
public void fecharConexao()
try
connection.close();
catch (SQLException ex)
ex.printStackTrace();
}
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