I am learning Apache 9.0 web server and Oracle 11g DB within Eclipse EE environment.
When I simply connect using
conn = DriverManager.getConnection(url, "name", "pw");
I can connect to Oracle DB and send SQL and receive result. (everything works.)
But when I try to connect with this method below, I get error.
public class JdbcUtil {
public static Connection getConnection() {
Connection con = null;
try {
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
DataSource ds = (DataSource) envCtx.lookup("jdbc/OracleDB");
System.out.println("ds = " + ds);
con = ds.getConnection();
System.out.println("con = " + con);
con.setAutoCommit(false);
System.out.println("DB connect success! Util");
} catch (Exception e) {
System.out.println("DB connect failure! Util");
e.printStackTrace();
}
return con;
}
Error message is
javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp].
at org.apache.naming.NamingContext.lookup(NamingContext.java:833)
at org.apache.naming.NamingContext.lookup(NamingContext.java:174)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:163)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at db.JdbcUtil.getConnection(JdbcUtil.java:14)
at service.mListService.memberList(mListService.java:15)
at controller.mListController.doProcess(mListController.java:45)
So the error is at Context envCtx = (Context) initCtx.lookup("java:comp/env");
But sometimes error is at DataSource ds = (DataSource) envCtx.lookup("jdbc/OracleDB");
This is my context.xml in META-INF (of my current project)
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource
name = "jdbc/OracleDB"
auth = "Container"
type = "javax.sql.DataSource"
username = "NAME"
password = "PW"
driverClassName = "oracle.jdbc.driver.OracleDriver"
factory = "org.apache.tomcat.dbcp.dbcp2.BasicDataSourceFactory"
url = "jdbc:oracle:thin:#127.0.0.1:1521:xe"
maxActive ="500"
maxIdle = "100"
/>
</Context>
This is my web.xml in WEB-INF/lib (of my current project)
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0">
<display-name>MemberBoard</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<resource-ref>
<description>Connection</description>
<res-ref-name>jdbc/OracleDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
I didn't touch xml files in my tomcat 9.0 server.
Related
Good day, respective all!
My environment:
Tomcat 8.5 under windows 64-bit
All needed jars are placed into $CATALINA_HOME/lib
It is my first attempt to write servlet using ConnectionPool.
After "googling"I made an entry inside $CATALINA_HOME/conf/server.xml:
<context docbase="msgsend" path="/msgsend" reloadable="true">
<context docbase="ssr" path="/ssr" reloadable="true">
<Resource
name="jdbc/OrServlet"
auth="Container"
type="javax.sql.DataSource"
user="STERN"
username="STERN"
password="pwdxxx"
driverClassName="oracle.jdbc.OracleDriver"
url="jdbc:oracle:thin:STERN/pwdxxx#XEPDB1"
/>
</context>
I included following into WEb-INF/web.xml:
<resource-ref>
<description>just a test</description>
<res-ref-name>jdbc/OrServlet</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
When I try to connect to Oracle in traditional way:
try {
cn = DriverManager.getConnection(
"jdbc:oracle:thin:#XEPDB1", "STERN", "pwdxx");
}
catch (Exception e) { }
everything works fine.
But when I try to connect through context:
Connection cn = null;
DataSource ds = null;
try
{
Context initCtx = new InitialContext();
Context envCtx = (Context)initCtx.lookup("java:comp/env");
ds = (DataSource)envCtx.lookup("jdbc/OrServlet");
cn = ds.getConnection();
}
catch(NamingException n) {}
catch(SQLException s) {out.println(ds.getClass().getName()+" exception "+s);
;}
I get :
**exception java.sql.SQLException: Cannot create JDBC driver of class '' for connect URL 'null'**
and ds.getClass().getName() in exception handler returns:
org.apache.tomcat.dbcp.dbcp2.BasicDataSource
which is distinct from javax.sql.DataSource as declared in
and .
And it seems to me that ds = (DataSource)envCtx.lookup("jdbc/OrServlet")
doesn't wvwn try to look inside Resource section.
What I missed?
Any help will be very appreciated.
Regards,
Andrew.
I'm unable to figure out why JNDI JDBC data source is failing
context.xml in META-INF
<?xml version="1.0" encoding="UTF-8"?>
<Context reloadable="true">
<Resource auth="Container"
name="jdbc/BigByte"
type="javax.sql.DataSource"
driverClassName="com.ibm.as400.access.AS400JDBCDriver"
url="jdbc:as400://****.****/****;prompt=false;sort=language;sort language=ENU;sort weight=shared"
username="****"
password="****"
maxIdle="10"
maxActive="200"
maxWait="5"
removeAbandoned="true"
removeAbandonedTimeout="1200" />
</Context>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" 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">
*
*
*
<resource-ref>
<description>Big Byte DB Connection</description>
<res-ref-name>jdbc/BigByte</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
</web-app>
my test
DataSource ds = null;
try {
Context initCtx = new InitialContext();
NamingEnumeration<NameClassPair> list = initCtx.list("");
while (list.hasMore()) {
System.out.println(list.next().getName());
}
Context envCtx = (Context)initCtx.lookup("java:comp/env");
ds = (DataSource)envCtx.lookup("jdbc/BigByte");
Connection con = ds.getConnection();
PreparedStatement ps = con.prepareStatement(
"select * from XAAQREV1 where AQABVN = ?");
ps.setString(1, "*****");
ResultSet rs = ps.executeQuery();
while (rs.next()) {
String uid = rs.getString("AQABVN");
System.out.println(uid);
}
} catch (NamingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
My console output
2017-09-28 10:13:26,482/: [http-nio-8080-exec-10/:ERROR] - Cannot find the class org/apache/naming/LocalStrings.class
2017-09-28 10:13:26,619/: [http-nio-8080-exec-10/:ERROR] - Cannot find the class org/apache/naming/LocalStrings_en.class
2017-09-28 10:13:26,775/: [http-nio-8080-exec-10/:ERROR] - Cannot find the class org/apache/naming/LocalStrings_en_US.class
2017-09-28 10:13:28,091/: [http-nio-8080-exec-10/:ERROR] - Cannot find the class org/apache/juli/JdkLoggerConfig.class
javax.naming.NameNotFoundException: Name [java:comp/env] is not bound in this Context. Unable to find [java:comp].
at org.apache.naming.NamingContext.lookup(NamingContext.java:824)
at org.apache.naming.NamingContext.lookup(NamingContext.java:172)
at javax.naming.InitialContext.lookup(Unknown Source)
at webx0001.XAC3DFR_ObFnc.ObRun(XAC3DFR_ObFnc.java:189)
...
When I step through my test, the NamingEnumeration list has no elements.
What are the console messages about missing classes about?
What am I missing?
I was not missing anything.
My project uses a Custom ClassLoader that breaks Tomcat JNDI.
I verified that with a simple servlet in a simple project.
My requirement is H2 database should get started while deploying my war file in embedded mode. For that I created class(DbSetup) in my java project. I mentioned the same class in web.xml . Then I implemented contextInitialized(ServletContextEvent sce) method. In that method I am making connection to h2 db to which I made connection while deploying war. While getting war file, I am getting exception like " No suitable class found for jdbc:h2:~/test1. Could you please how to approach this problem? I am binding h2-1.4.192.jar with my war. I also copied the same jar to class path.
web.xml :
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>CEMDBWS</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<listener>
<listener-class>org.h2.server.web.DbStarter</listener-class>
</listener>
<context-param>
<param-name>db.url</param-name>
<param-value>"jdbc:h2:~/test1"</param-value>
</context-param>
<context-param>
<param-name>db.user</param-name>
<param-value>sa</param-value>
</context-param>
<context-param>
<param-name>db.password</param-name>
<param-value>sa</param-value>
</context-param>
<listener>
<listener-class>DbSetup</listener-class>
</listener>
<servlet>
<servlet-name>JSON TO SQL Rest API</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>JSON TO SQL Rest API</servlet-name>
<url-pattern>/Request/*</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>-1</session-timeout>
<tracking-mode>COOKIE</tracking-mode>
</session-config>
<mime-mapping>
<extension>json</extension>
<mime-type>application/json</mime-type>
</mime-mapping>
my class:
try
{
Connection connection = null;
final String DB_CONNECTION = "jdbc:h2:~/test1";
final String DB_USER = "sa";
Class.forName(org.h2.Driver);
final String DB_PASSWORD = "sa";
connection = DriverManager.getConnection(DB_CONNECTION, DB_USER, DB_PASSWORD);
return connection;
} catch (SQLException e) {
LOGGER.error("Error while getting DB connection", e);
return connection;
} catch (ClassNotFoundException e) {
LOGGER.error("Error while loading Driver", e.getMessage());
}
return connection
Am building a small Jersey (1.9) REST Service and having a Java class as sub-resource where I connect to local database (Postgres 9.3).
For the datasource I have already add the entries in Context.xml:
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/userProfile">
<Resource
auth="Container"
driverClassName="org.postgresql.Driver"
maxActive="100"
maxIdle="30"
maxWait="10000"
name="jdbc/apiUserProfile"
password="postgres"
type="javax.sql.DataSource"
url="jdbc:postgresql://localhost:5432/apiUserProfile"
username="postgres"/>
</Context>
When I run the application and call the following resource:
http://localhost:8084/userProfile/rest/user/conn
the page is blank - no content- and the tomcat (8.0) on netbeans (8.1) is throwing Error: Null Pointer Exception
javax.naming.NameNotFoundException: Name [jdbc/apiUserProfile] is not bound in this Context. Unable to find [jdbc].
at org.apache.naming.NamingContext.lookup(NamingContext.java:818)
at org.apache.naming.NamingContext.lookup(NamingContext.java:166)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:157)
at javax.naming.InitialContext.lookup(InitialContext.java:411)
at net.rest.dao.DbConn.apiUserProfileConn(DbConn.java:23)
at net.rest.service.userProfile.returnDatabaseStatus(userProfile.java:51)
I also already have the JAR files in the librairies:
lib/mysql-connector-java-5.1.39-bin.jar
lib/postgresql-9.3-1100-jdbc4.jar
and here is the sub-resource class for the datasource connection:
package net.rest.dao;
import javax.naming.*;
import javax.sql.*;
public class DbConn {
private static DataSource DbConn = null;
private static Context context = null;
public static DataSource apiUserProfileConn() throws Exception {
if(DbConn != null){
return DbConn;
}
try {
if(context == null){
context = new InitialContext();
}
DbConn = (DataSource) context.lookup("jdbc/apiUserProfile");
}
catch (Exception e) {
e.printStackTrace();
}
return DbConn;
}
}
Any Idea pls. how to fix this..
Many Thanks
a.kasbi
The issue is resolved now.. the Apache Tomcat Doc was very helpful:
http://localhost:8080/docs/jndi-datasource-examples-howto.html
http://localhost:8080/docs/jndi-datasource-examples-howto.html#PostgreSQL
The solution for me was adding the following into context.xml under: META-INF
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/apiRest">
<Resource name="jdbc/apiUserProfile" auth="Container"
type="javax.sql.DataSource" driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://127.0.0.1:5432/apiUserProfile"
username="postgres" password="postgres" maxTotal="20" maxIdle="10"
maxWaitMillis="-1"/>
</Context>
and the following in web.xml:
<resource-ref>
<description>postgreSQL Datasource example</description>
<res-ref-name>jdbc/apiUserProfile</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
The lookup argument in the java Class for the Datasource connection:
...
DbConn = (DataSource) context.lookup("java:/comp/env/jdbc/apiUserProfile");
...
Thanks
I have a very simple database in postgres and i have used hibernate to "connect" to it. Everything works fine, i tested the database with hibernate and no problems so far.
Here is my DAO
#Repository("clientsBasicDao")
#Transactional
public class ClientsBasicDaoImpl implements ClientsBasicDao {
private Log log = LogFactory.getLog(ClientsBasicDaoImpl.class);
private SessionFactory sessionFactory;
private Session session;
public SessionFactory getSessionFactory() {
return sessionFactory;
}
#Resource(name="sessionFactory")
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
session = sessionFactory.openSession();
}
#SuppressWarnings("unchecked")
#Transactional(readOnly=true)
public List<ClientsBasic> findAllClients() throws HibernateException{
return session.createQuery("from ClientsBasic").list();
}
public ClientsBasic findClientById(int id) throws HibernateException {
return (ClientsBasic) session.
getNamedQuery("ClientsBasic.findById").setParameter("id", id).uniqueResult();
}
public ClientsBasic findClientByEmail(String email) throws HibernateException{
return (ClientsBasic) session.
getNamedQuery("ClientsBasic.findByEmail").setParameter("email", email).uniqueResult();
}
#SuppressWarnings("unchecked")
public List<ClientsBasic> findDirectClients() throws HibernateException{
return session.getNamedQuery("ClientsBasic.findDirectClients").list();
}
#SuppressWarnings("unchecked")
public List<ClientsBasic> findIndirectClients() throws HibernateException{
return session.getNamedQuery("ClientsBasic.findIndirectClients").list();
}
public ClientsBasic save(ClientsBasic client) throws HibernateException {
Transaction tx = null;
tx = session.beginTransaction();
session.saveOrUpdate(client);
tx.commit();
log.info("Client saved with id: " + client.getClientId());
return client;
}
public void delete(ClientsBasic client) throws HibernateException {
Transaction tx = null;
tx = session.beginTransaction();
Set<Resources> res = client.getClientResources();
if(res.size() > 0){ //there are client access resources for this client
Iterator<Resources> it = res.iterator();
while(it.hasNext()){
Resources resource = it.next();
resource.getClientsBasics().remove(client);
}
}
session.delete(client);
tx.commit();
log.info("Client deleted with id: " + client.getClientId());
}
}
Now, i am trying to learn restful web services so after some tutorials i tried my own implementation. It works, except when i try to use the method that connects to the database.
#RestController
public class GreetingController {
private static final String template = "Hello, %s!";
private final AtomicLong counter = new AtomicLong();
//http://localhost:8080/TestProject/greeting
// or
//http://localhost:8080/TestProject/greeting?name=stackoverflow
#RequestMapping("/greeting")
public #ResponseBody String greeting(
#RequestParam(value="name", required=false, defaultValue="World") String name) {
return new Greeting(counter.incrementAndGet(),
String.format(template, name)).toString();
}
//http://localhost:8080/TestProject/testing
#RequestMapping("/testing")
public #ResponseBody String home(){
return "Welcome, the server is now up and running!";
}
//http://localhost:8080/TestProject/client?id=1
#RequestMapping("/client")
public #ResponseBody String client( //FAILS HERE
#RequestParam(value="id", required=true) String id){
ClientServiceBackend cb = new ClientServiceBackend();
return cb.findClient(Integer.parseInt(id));
}
}
and here is the error
HTTP Status 500 - Handler processing failed; nested exception is java.lang.NoClassDefFoundError: org/hibernate/HibernateException
org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.NoClassDefFoundError: org/hibernate/HibernateException
org.springframework.web.servlet.DispatcherServlet.triggerAfterCompletionWithError(DispatcherServlet.java:1284)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:965)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)
javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
My web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>test</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>rest</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>rest</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
and dispatcher:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<context:component-scan base-package="com.project.rest" />
<mvc:annotation-driven />
</beans>
like i said, i am trying to learn rest and this is my 2nd week with spring, so this is all kinda new to me, but i would expect this to work since the database is working fine!
NOTE: I am deploying this on Tomcat v7
can someone please give a hand here?
Thank you :-)
EDIT:
I added the hibernate jar to the tomcat classpath, and now the error is
The matching wildcard is strict, but no declaration can be found for element 'tx:annotation-driven'.