How do I see MySql connection URL from openshift? I need it to use it in hibernate.cfg.xml
When I log onto my account online I only see the username and password.
On open shift the database is already available in JNDI. It's name is jdbc/MySQLDS.
To use this 'datasource' in hibernate, your hibernate.cfg.xml should look something like this:
<!-- Database connection settings -->
<property name="hibernate.connection.datasource">java:comp/env/jdbc/MySQLDB</property>
<!-- SQL dialect -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Mapped annotated entity-->
<mapping class="org.hibernate.tutorial.domain.Event"/>
</session-factory>
To help you even mote please tell us if you are using JbossEWS 1.0, 2.0, JBoss AS6, JBoss EAP. Is your app scale, etcetera.
Related
I'm trying to port my web-app created on Windows, using Hibernate, XAMPP for Apache tomcat and mysql server, to Linux, using Docker. I've deployed my war file under webapps folder on tomcat container, linked to mysql container ... the fact is that my web app is very very slow: i.e., the first feature is login/register form: on Linux, there is latency about minutes!
I've created containers with the following commands:
docker run -d --name mysql-phpmyadmin -p 127.0.0.1:8686:80 -p 127.0.0.1:3306:3306 grzesiekb/mysql-phpmyadmin
docker run -d -p 8484:8080 -p 8007:8009 --name tomcat8-linked --link mysql-phpmyadmin:mysqlphp tomcat:8.0-jre8
This is my hibernate.cfg.xml file:
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- queste configurazioni sono per il testing in locale -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://mysqlphp:3306/at_db</property>
<property name="hibernate.connection.username">root</property>
<property name="connection.password">mysql_pass</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="show_sql">false</property>
<!--<property name="hibernate.hbm2ddl.auto">create-drop</property> se al posto di update metto create, mi cancella il db e lo rifa -->
<property name="hbm2ddl.auto">update</property>
<!-- Entity -->
<mapping class="com.ATBoscoCastellano.Entity.ClientUser" />
<mapping class="com.ATBoscoCastellano.Entity.GenericUser" />
<mapping class="com.ATBoscoCastellano.SessionManagement.SessionToken" />
<mapping class="com.ATBoscoCastellano.Entity.Post" />
<!-- <mapping class="it.boscus.StarFoods.entity.ExampleEmbeddableIDClass2" /> -->
</session-factory>
</hibernate-configuration>
And this is what I see from tomcat logs:
20-Feb-2017 07:48:15.869 SEVERE [http-apr-8080-exec-3] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [com.ATBoscoCastellano.servlets.UserSessionServlet] in context with path [/AtApplicazione1] threw exception
org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:115)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
....
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 232,149,705 milliseconds ago. The last packet sent successfully to the server was 232,149,705 milliseconds ago. is longer than the server configured
value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this probl
em.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:983)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3644)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2452)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2617)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2546)
at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4873)
at org.hibernate.engine.jdbc.connections.internal.PooledConnections.poll(PooledConnections.java:76)
at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:187)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:386)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:84)
... 34 more
Caused by: java.net.SocketException: Broken pipe (Write failed)
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)
at java.net.SocketOutputStream.write(SocketOutputStream.java:155)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
I've tried adding autoReconnect=true on Url in hibernate, but still doesn't work. In my mysql my.cnf there is no wait_timeout line.
I have to tell that web-app works, but i attend a lot of time (tens of minutes) after my servlet (that interacts via hibernate with mysql container) works. This servlet, that manages login/register form, checks from the db the eventual presence of the inserted credentials.
I have tomcat container based on tomcat8.0-jre8 official docker image;
From mysql -V I have
root#1c53f40b63d3:/var/log/mysql# mysql -V
mysql Ver 14.14 Distrib 5.5.42, for debian-linux-gnu (x86_64) using readline 6.3
I really don't know why on Windows it works perfectly, but here not. My servlet remain in "pending" state ... i really want to know why there is so spending in time and how to solve it.
I try to move from mysql-java-client to mariadb-java-client. I use HikariCP pool and I use default MySQL configuration provide from HikariCP website.
If I use default mysql client, works fine, but with mariadb I need to remove this params:
<!-- Works with both clients -->
<property name="hibernate.connection.provider_class">com.zaxxer.hikari.hibernate.HikariConnectionProvider</property>
<!-- Works with mysql-java-client, not with mariadb-java-client -->
<property name="hibernate.hikari.dataSource.cachePrepStmts">true</property>
<property name="hibernate.hikari.dataSource.prepStmtCacheSize">250</property>
<property name="hibernate.hikari.dataSource.prepStmtCacheSqlLimit">2048</property>
<property name="hibernate.hikari.dataSource.useServerPrepStmts">true</property>
I don't known if I need to specified these params or are optional.
Unfortunately, not currently supported by the MariaDB JDBC driver.
I am preparing some application with usage of JPA 2.0, Hibernate as provider, MySQL 5 as database, which will be deployed on JBoss AS 7.0.2.I have already configured some basics in persistence.xml and I came into some kind of trouble. I have noticed that some people also defines some specific DataSource on JBoss Management Console level.
My question is. Do I really need to worry about some DataSource or anything like that in Hibernate application?I thought it is important in old JDBC approach.In some books, where examples are shown, there is no such configuration in persistence.xml or hibernate.cfg.xml
Do I have to place mysql connector into JBOSS_HOME/standalone/deployments directory to use MySQL in my application?Here is content of my persistence.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="SomeApp">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/somedb" />
<property name="hibernate.connection.username" value="" />
<property name="hibernate.connection.password" value="" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
</properties>
</persistence-unit>
</persistence>
Well, you can either access the database by:
providing the url/driver/password/etc. information in the persistence.xml using your jpa-provider properties (in your case hibernate.connection.*) or the JPA 2.0 standardised javax.persistence.jdbc.* ones - this basically looks like the example you've posted,
creating a Data Source in the ApplicationServer and just referring to it in the persistence.xml (through it's JNDI name you provide during creation) which might look similar to this (without the XML schema definition for the sake of brevity) :
<persistence>
<persistence-unit name="SomeApp">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>jdbc/myDB</jta-data-source>
</persistence-unit>
</persistence>
What you're actually doing right now (with these properties) is using the JDBC.
I would definitely go with the creation of the Data Source in the ApplicationServer rather than providing it in the properties in persistence.xml. It allows you to dynamically change the end-database, it's type, credentials, manage connection pools, etc. without even touching your descriptor.
It's also safer, as the credentials are not written in the plain file left on your server.
As a side note, please remember that the javax.persistence.jdbc.* properties are a JPA provider must requirement for the Java SE environment, but it's optional for Java EE.
Hope that helps!
Do I have to place mysql connector into
JBOSS_HOME/standalone/deployments directory to use MySQL in my
application?
Yes you need to put Mysql J/connector for use it as JDBC Driver. Your application server (JBOss, Weblogic, Glassfish, etc) doesn't provide it because depend of the RDBMS that you are using (in this case Mysql) and the version of it.
In the case of JBoss 7 the JDBC driver can be installed into the container in one of two ways: either as a deployment or as a core module. For the pros/cons of both modes an detailed explanatio you can check the following documentation: http://community.jboss.org/wiki/DataSourceConfigurationInAS7
I getting an error when running my program. the error is: org.hibernate.HibernateException: JDBC Driver class not found: com.mysql.jdbc.Driver.
The driver is there...I am not sure what it causing this. Any suggestions?
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/registrar</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<mapping resource="com/ths/entity/Course.hbm.xml"/>
<mapping resource="com/ths/entity/Student.hbm.xml"/>
<mapping resource="com/ths/entity/Enrollment.hbm.xml"/>
</session-factory>
</hibernate-configuration>
The driver is there...I am not sure what it causing this.
The driver is not there. The error is simple: the Java VM couldn't find your driver. So, double-check the classpath. If you are deploying a web-application, make sure your driver is in the server's lib, and not in WEB-INF/lib.
You may have that jar in project but class loader is unable to find that as class loader does not check each and every folder of project. If it is a web application then you need to put jar file in WEB-INF/LIB.
If it is a standalone application then you need to add jar file in build path.
you can check class path during run time to see whether folder (where jar exist) is considered in class path or not.
I am not sure what was causing this. I was trying this on my work computer. I tried it at home and it worked fine. Must just be a setting.
I am a beginer with visual studio 2008 (C#), mysql and NHibernate.
I have problems with mysql connector as I don't know how to add reference to it.
In my project I have:
/lib/mysql-connector-net-6.1.4-src/
(downloaded from http://dev.mysql.com/downloads/mirror.php?id=387799#mirrors)
Now I right click on my project -> addReference -> browse -> What now?
Should I also edit my hibernate configuration?
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
<session-factory>
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
<property name="connection.driver_class">NHibernate.Driver.MySqlDataDriver</property>
<property name="connection.connection_string">Server=localhost;database=Pets;Database=pets,User ID=root,Password=;</property>
<property name="dialect">NHibernate.Dialect.MySQL5Dialect</property>
<property name="proxyfactory.factory_class"> NHibernate.ByteCode.LinFu.ProxyFactoryFactory, NHibernate.ByteCode.LinFu </property>
<property name="show_sql">false</property>
</session-factory>
</hibernate-configuration>
Thanks
You need to add a reference to the MySQL connector DLL that corresponds to the version of .NET you are targeting.
From the link provided, it seems like you downloaded the source code for the MySQL connector, so you'll either need to build this code and take the desired DLL out of the /bin folder afterwards or download a full installer (which will include the binaries) from the second link here:
http://dev.mysql.com/downloads/connector/net/6.1.html
Once you add this DLL to your project, you'll need to edit that NHibernate configuration to update the "connection.connection_string" property with the connection string for your database.
Hope this helps. There is some more documentation available here:
http://dev.mysql.com/doc/refman/5.1/en/connector-net.html