We are using the bellow properties in our persistence.xml file.
<properties>
<property name="javax.persistence.jdbc.driver" value="oracle.jdbc.driver.OracleDriver" />
<property name="javax.persistence.jdbc.dialect" value="org.hibernate.dialect.OracleDialect" />
<property name="javax.persistence.jdbc.url" value="jdbc:oracle:thin:#XYZDB01:78111:TATAD1" />
<property name="javax.persistence.jdbc.user" value="admin" />
<property name="javax.persistence.jdbc.password" value="admin#123" />
<property name="javax.persistence.jdbc.Schema" value="CSMVC" />
</properties>
But I want to externalize the dynamic properties from persistence.xml something like bellow.
<properties>
<property name="javax.persistence.jdbc.driver" value="${db.driver}" />
<property name="javax.persistence.jdbc.dialect" value="${db.dialect}" />
<property name="javax.persistence.jdbc.url" value="${db.url}" />
<property name="javax.persistence.jdbc.user" value="${db.user}" />
<property name="javax.persistence.jdbc.password" value="${db.password}" />
<property name="javax.persistence.jdbc.Schema" value="${db.schema}" />
</properties>
Note: We are using openJpa as the JPA provider.
Normally, you would define your datasource in your container and have JPA look it up via JNDI. Are you running JPA in Spring/TomEE/Tomcat/Wildfly/Liberty or anything else?
Related
I'm having problems with a server in Spring 4 and Mysql with Hibernate, Every first connection it is answering me org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
My properties.xml is:
<persistence-unit name="defaultPersistenceUnit"
transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url"
value="jdbc:mysql://mysql.******?reconnect=true" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="****" />
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.event.merge.entity_copy_observer"
value="allow" />
<property name="c3p0.acquire_increment" value="1" />
<property name="c3p0.idle_test_period" value="100" />
<property name="c3p0.max_size" value="100" />
<property name="c3p0.max_statements" value="0" />
<property name="c3p0.min_size" value="10" />
<property name="c3p0.timeout" value="100" />
<property name="hibernate.c3p0.preferredTestQuery" value="SELECT 1" />
</properties>
</persistence-unit>
Someone is having the same problem or knows a solution?
Thanks in advance!!!
Try with the following JDBC url
jdbc:mysql://localhost:3306/poc
poc is schema name
I am trying to connect Postgres and mysql simultaneously in JPA with Ejb following is my persistence.xml and I am deploying the code in wildfly 10
<persistence 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"
version="2.0">
<persistence-unit name="pl4smsMYSQL-persistence">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<!-- <shared-cache-element>ENABLE_SELECTIVE</shared-cache-element> -->
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/newtable" />
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="root" />
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.hbm2ddl.auto" value="validate" />
<!-- Configuring Connection Pool -->
<property name="hibernate.c3p0.min_size" value="5" />
<property name="hibernate.c3p0.max_size" value="20" />
<property name="hibernate.c3p0.timeout" value="500" />
<property name="hibernate.c3p0.max_statements" value="50" />
<property name="hibernate.c3p0.idle_test_period" value="2000" />
<!-- <property name="hibernate.hbm2ddl.auto" value="create"/> -->
<!-- <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/newtable" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="root" />
<property name="hibernate.listeners.envers.autoRegister"
value="false" />
<property name="hibernate.id.new_generator_mappings" value="true" />
<property name="hibernate.cache.use_second_level_cache"
value="false" />
<property name="show_sql" value="true"/>
<property name="hibernate.c3p0.min_size" value="50" /> <property
name="hibernate.c3p0.max_size" value="100" /> <property name="hibernate.c3p0.timeout"
value="100" /> <property name="hibernate.c3p0.idle_test_period" value="1"
/> <property name="hibernate.cache.use_query_cache" value="false" /> <property
name="javax.persistence.sharedCache.mode" value="ENABLE_SELECTIVE" /> <property
name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory"
/> <property name="hibernate.cache.provider_class" value="net.sf.ehcache.hibernate.SingletonEhCacheProvider"
/> <property name="hibernate.cache.use_query_cache" value="true" /> <property
name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory"
/> <property name="net.sf.ehcache.configurationResourceName" value="/ehcache.xml"
/>
<property name="hibernate.enable_lazy_load_no_trans" value="true" />
uncomment generate_statistics line to generate cache statistics
<property name="hibernate.generate_statistics" value="true" />
<property name="eclipselink.jdbc.batch-writing" value="JDBC" /> <property
name="eclipselink.jdbc.batch-writing.size" value="20" />
<property name="hibernate.hbm2ddl.auto" value="create"/> -->
</properties>
</persistence-unit>
<persistence-unit name="pl4sms-persistence">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<!-- <shared-cache-element>ENABLE_SELECTIVE</shared-cache-element> -->
<properties>
<property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
<property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/pl4smstest" />
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="password" />
<property name="hibernate.listeners.envers.autoRegister"
value="false" />
<property name="hibernate.id.new_generator_mappings" value="true" />
<property name="hibernate.cache.use_second_level_cache"
value="false" />
<!-- <property name="hibernate.c3p0.min_size" value="50" /> <property
name="hibernate.c3p0.max_size" value="100" /> <property name="hibernate.c3p0.timeout"
value="100" /> <property name="hibernate.c3p0.idle_test_period" value="1"
/> <property name="hibernate.cache.use_query_cache" value="false" /> <property
name="javax.persistence.sharedCache.mode" value="ENABLE_SELECTIVE" /> <property
name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory"
/> <property name="hibernate.cache.provider_class" value="net.sf.ehcache.hibernate.SingletonEhCacheProvider"
/> <property name="hibernate.cache.use_query_cache" value="true" /> <property
name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory"
/> <property name="net.sf.ehcache.configurationResourceName" value="/ehcache.xml"
/>
<property name="hibernate.enable_lazy_load_no_trans" value="true" />
uncomment generate_statistics line to generate cache statistics
<property name="hibernate.generate_statistics" value="true" />
<property name="eclipselink.jdbc.batch-writing" value="JDBC" /> <property
name="eclipselink.jdbc.batch-writing.size" value="20" />
<property name="hibernate.hbm2ddl.auto" value="create"/> -->
</properties>
</persistence-unit>
</persistence>
and this is the pom.xml I am using
<dependency>
<groupId>org.apache.openejb</groupId>
<artifactId>tomee-embedded</artifactId>
<version>1.0.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>6.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.3.Final</version>
</dependency>
I am able to connect to postgres , but for mysql its giving wrong username and password error , i tried connecting mysql with commad prompt its get connected with same username and password. I tried removing Postgres connection and connected using only mysql still it gives the same error.
follwing is the error I am getting
Throwable while attempting to get a new connection: null: javax.resource.ResourceException: IJ031084: Unable to create connection
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:336)
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.getLocalManagedConnection(LocalManagedConnectionFactory.java:343)
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:278)
at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.createConnectionEventListener(SemaphoreArrayListManagedConnectionPool.java:1289)
at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.getConnection(SemaphoreArrayListManagedConnectionPool.java:492)
at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getSimpleConnection(AbstractPool.java:627)
at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:599)
at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:579)
at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:430)
at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:737)
at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:162)
at org.jboss.as.connector.subsystems.datasources.WildFlyDataSource.getConnection(WildFlyDataSource.java:74)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:139)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcServicesImpl.java:279)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:124)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:857)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:425)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:849)
at org.jboss.as.jpa.hibernate4.TwoPhaseBootstrapImpl.build(TwoPhaseBootstrapImpl.java:44)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:154)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:117)
at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:665)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:182)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
at org.jboss.threads.JBossThread.run(JBossThread.java:320)
Caused by: org.h2.jdbc.JdbcSQLException: Wrong user name or password [28000-173]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:331)
at org.h2.message.DbException.get(DbException.java:171)
at org.h2.message.DbException.get(DbException.java:148)
at org.h2.message.DbException.get(DbException.java:137)
at org.h2.engine.Engine.validateUserAndPassword(Engine.java:302)
at org.h2.engine.Engine.createSessionAndValidate(Engine.java:147)
at org.h2.engine.Engine.createSession(Engine.java:122)
at org.h2.engine.Engine.createSession(Engine.java:28)
at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:313)
at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:105)
at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:90)
at org.h2.Driver.connect(Driver.java:73)
at org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory.createLocalManagedConnection(LocalManagedConnectionFactory.java:312)
... 32 more
A better idea will be to create two datasources in WildFly and then reference them in your persistence.xml files:
<persistence-unit name="pl4smsMYSQL-persistence" transaction-type="JTA">
<jta-data-source>java:jboss/datasources/MySqlDS</jta-data-source>
...
</persistence-unit>
<persistence-unit name="pl4sms-persistence" transaction-type="JTA">
<jta-data-source>java:jboss/datasources/PostgreSqlDS</jta-data-source>
...
</persistence-unit>
The great majority of your configuration properties then become redundant.
This will also have the benefit that your servers will be independently configured for each environment so you won't need different application builds for test and production.
Note that you can then also remove the driver jars from your application as they are separately deployed to the server.
I am using hibernate 4.2 and working on J2ee6 with tomee 1.7.4 . I need to write multi-tenant code, which can connect to various databases on demand. I tried doing this by creating multiple persistence units in persistence.xml, but during server startup tomee tries to validate connection to all persistence units(all of them might not be available during testing).
I tried to find some setting that tells tomee to skip validation of the connections at startup, but couldn't find one. So instead of creating entitymanager from persistence unit, I started using the function
javax.persistence.Persistence.createEntityManagerFactory(String persistenceUnitName, Map properties)
and my persistence xml did not had any properties. This helped me solve this problem, but my caching stopped working when i moved to this model, it was working previously.
Can any one suggest some way in which i can ask tomee to skip validating persistence units at startup, or i can enable caching in the other way that i found.
My previous persistence.xml looked like
<?xml version="1.0" encoding="UTF-8" ?><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"
version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="localDB" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<properties>
<property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.format_sql" value="false" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/xxxxxx?autoReconnect=true" />
<property name="hibernate.connection.username" value="xxxxx" />
<property name="hibernate.connection.password" value="xxxxx" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.c3p0.acquire_increment" value="1"/>
<property name="hibernate.c3p0.max_size" value="40"/>
<!-- it must be set to LESS than the wait_timout setting for the mysql server (this setting defaults to 28800 secs (8 hours)) -->
<property name="hibernate.c3p0.idle_test_period" value="28680" />
<property name="hibernate.c3p0.preferredTestQuery" value="select 1;" />
<property name="hibernate.c3p0.timeout" value="60000"/>
<property name="hibernate.connection.zeroDateTimeBehavior" value="convertToNull"/>
<property name="hibernate.c3p0.debugUnreturnedConnectionStackTraces " value="true"/>
<property name="debugUnreturnedConnectionStackTraces " value="true"/>
<property name="hibernate.cache.use_second_level_cache" value="true" />
<property name="hibernate.cache.use_query_cache" value="true" />
<property name="hibernate.cache.region.factory_class" value="com.mc.hibernate.memcached.MemcachedRegionFactory" />
<property name="hibernate.memcached.operationTimeout" value = "40000"/>
<property name="hibernate.memcached.connectionFactory" value = "KetamaConnectionFactory"/>
<property name="hibernate.memcached.hashAlgorithm" value = "HashAlgorithm.FNV1_64_HASH"/>
<property name="hibernate.memcached.servers" value = "xxxxx:xxxx"/>
<property name="hibernate.cache.region_prefix" value=""/>
</properties>
</persistence-unit>
<persistence-unit name="production" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<properties>
<property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.format_sql" value="false" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql://xxxxx:3306/thewalkindb?autoReconnect=true" />
<property name="hibernate.connection.username" value="xxxx" />
<property name="hibernate.connection.password" value="xxxxx" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.c3p0.acquire_increment" value="1"/>
<property name="hibernate.c3p0.max_size" value="15"/>
<!-- it must be set to LESS than the wait_timout setting for the mysql server (this setting defaults to 28800 secs (8 hours)) -->
<property name="hibernate.c3p0.idle_test_period" value="28680" />
<property name="hibernate.c3p0.preferredTestQuery" value="select 1;" />
<property name="hibernate.c3p0.timeout" value="60000"/>
<property name="hibernate.connection.zeroDateTimeBehavior" value="convertToNull"/>
<property name="hibernate.c3p0.debugUnreturnedConnectionStackTraces " value="true"/>
<property name="debugUnreturnedConnectionStackTraces " value="true"/>
<property name="hibernate.cache.use_second_level_cache" value="true" />
<property name="hibernate.cache.use_query_cache" value="true" />
<property name="hibernate.cache.region.factory_class" value="com.mc.hibernate.memcached.MemcachedRegionFactory" />
<property name="hibernate.memcached.operationTimeout" value = "40000"/>
<property name="hibernate.memcached.connectionFactory" value = "KetamaConnectionFactory"/>
<property name="hibernate.memcached.hashAlgorithm" value = "HashAlgorithm.FNV1_64_HASH"/>
<property name="hibernate.memcached.servers" value = "xxxxxxxx"/>
<property name="hibernate.cache.region_prefix" value=""/>
</properties>
</persistence-unit>
this works with caching , but it doesnot gives me flexibility to skip validation at tomee startup
My new persistence xml which does not honours caching, but allows me the flexibility is as follows
<?xml version="1.0" encoding="UTF-8" ?>
<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"
version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="localDB" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<properties></properties>
</persistence-unit>
<persistence-unit name="production" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<properties>
</properties>
</persistence-unit>
I am populating all the properties in a map and calling the function
javax.persistence.Persistence.createEntityManagerFactory(String persistenceUnitName, Map properties), but somehow it does not honours caching.
I don't get the link between validation and caching. If you do a facade to the entity manager tenant aware you just have caching per entity manager which means you will not check local cache for production persistence unit.
If you want a single entity manager - =you'll get a single JPA cache in this mode which will merge local and production - you can use dynamic routing: http://tomee.apache.org/examples-trunk/dynamic-datasource-routing/README.html instead of dynamic persistence units.
I'm having troubles when generating sequences for an oracle databese running under the same instance than other one, with the same data structure. Here is a fragment of my persistence.xml where I define different schemas according to the persistence unit:
<persistence-unit name="oracle_development" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.archive.autodetection" value="class" />
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy" />
<property name="hibernate.connection.charSet" value="UTF-8" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.format_sql" value="false" />
<property name="hibernate.connection.autocommit" value="false" />
<property name="hibernate.ejb.entitymanager_factory_name"
value="o11g" />
<property name="hibernate.default_schema" value="devdatabase"/>
</properties>
</persistence-unit>
<persistence-unit name="oracle_production" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.archive.autodetection" value="class" />
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy" />
<property name="hibernate.connection.charSet" value="UTF-8" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.format_sql" value="false" />
<property name="hibernate.connection.autocommit" value="false" />
<property name="hibernate.ejb.entitymanager_factory_name"
value="o11g" />
<property name="hibernate.default_schema" value="proddatabase"/>
</properties>
</persistence-unit>
Well, the tables are generated perfectly, once the table names in creating commands include the default schema as qualifier. But sequences are not generated in the 'proddatabase' if they're already created on 'devdatabase', in example... Any help?
The hibernate.hbm2ddl.auto=”update” is convenient but less flexible if you plan on adding functions or executing some custom scripts.
So, the most flexible approach is to generate the DDL scripts with "org.hibernate.tool.ant.HibernateToolTask" and then use a component to execute the scripts on context startup. The destroy scripts are called when the Spring context is closed.
The second approach is much more flexible, especially if you want to mix JPA Entity Model with jOOQ Table Model.
Needless to say that this is only an Integration testing concern since for the production environment we use Flyway. So, you shouldn't rely on Hibernate for managing your database schema, because it's riskier, less flexible and it doesn't play well with CI and CD.
I am using JPA 2.0, Hibernate 3 Annotation Version, the problem is that i am confusing in Persistence.xml & DispatcherServlet
My persistence.xml file contains:
<?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="Hello" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>models.student</class>
<properties>
<property name="hibernate.show_sql" value="true" />
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://127.0.0.1:3306/test"/>
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="admin" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLInnoDBDialect"/>
</properties>
</persistence-unit>
</persistence>
In my dispatcher servlet file I have following Beans:
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test" />
<property name="username" value="root" />
<property name="password" value="admin" />
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="Hello" />
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
<property name="showSql" value="true" />
<property name="generateDdl" value="true" />
</bean>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
Question is: why do we need to put all properties (DriverClassName, URL, UserName, Password) in both persistence.xml and in DataSource bean in DispatcherServlet?
I am learning and it is confusing me, please help.
Actually you have double configuration here.
You need either persistence.xml or bean definitions.
Take a look here