I'm trying to write a Java EE application that uses JPA to access a database. Until now I just used the #Entity annotation and left everything else to the default state (for example the persistence.xml file was using _TimerPool as the jta-data-source, and I didn't create any db).
So I wanted to try and use an actual database. I went into the Services screen, JavaBD > Create new database, set it up with a name and password.
The DB's url: jdbc:derby://localhost:1527/Prova
Then I created the persistence.xml file for my application through Glassfish's wizard:
<persistence-unit name="JobsPU" transaction-type="JTA">
<jta-data-source>java:app/Prova</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.schema-generation.database.action" value="create"/>
<property name="javax.persistence.schema-generation.database.target" value="database-and-scripts"/>
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:derby://localhost:1527/Prova"/>
<property name="javax.persistence.jdbc.user" value="paolo"/>
<property name="javax.persistence.jdbc.password" value="paolo"/>
</properties>
</persistence-unit>
And when I try to deploy I get this exception:
Grave: Exception while preparing the app : Invalid resource : { ResourceInfo : (jndiName=java:app/Prova__pm), (applicationName=Jobs) }
com.sun.appserv.connectors.internal.api.ConnectorRuntimeException: Invalid resource : { ResourceInfo : (jndiName=java:app/Prova__pm), (applicationName=Jobs) }
Seems to be related to the JNDI naming. Of what I honestly don't know, I'm still trying to learn. If I go to Glassfish's console, under the JNDI listing I can't see anything that seems to be related to my database (not in JDBC Connection Pools nor in JDBC Resources). What should I do?
Thank you very much in advance for any help.
To configure PersistenceUnit for EE container you have to use jta-data-source and transaction-type="JTA". For jta-data-source you have to specify JNDI name of JDBC ConnectionPool which have to be configured in EE container (glassfish server in your case). There is tutorial How to set up a JDBC Connection Pool on Glassfish. Also in this case PersistenceUnit properties like
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:derby://localhost:1527/Prova"/>
<property name="javax.persistence.jdbc.user" value="paolo"/>
<property name="javax.persistence.jdbc.password" value="paolo"/>
will be ignored for EE container (see this documentation).
To use this properties you can configure PersistenceUnit for SE environment. Before this i recommend you to read article differences between RESOURCE_LOCAL and JTA persistence contexts.
Configuration for SE application will be look like:
<persistence-unit name="default" transaction-type="RESOURCE_LOCAL">
<provider>
org.eclipse.persistence.jpa.PersistenceProvider
</provider>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:derby://localhost:1527/Prova"/>
<property name="javax.persistence.jdbc.user" value="paolo"/>
<property name="javax.persistence.jdbc.password" value="paolo"/>
</properties>
</persistence-unit>
Related
I need to fill my database on ear startup, so I add javax.persistence.sql-load-script-source tag with reference to the file.
<persistence-unit name="MyPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>java:/jboss/datasource/mydatasource</jta-data-source>
<jar-file>Entities.jar</jar-file>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.schema-generation.database.action" value="create"/>
<property name="eclipselink.logging.logger" value="org.eclipse.persistence.logging.DefaultSessionLog"/>
<property name="eclipselink.logging.level" value="ALL"/>
<property name="eclipselink.logging.level.sql" value="ALL"/>
<property name="javax.persistence.sql-load-script-source" value="META-INF/defaultdata.sql"/>
<property name="javax.persistence.sql-load-script-source" value="META-INF/insertnations.sql"/>
</properties>
</persistence-unit>
It works, but now i want to use two file because i want to separate "most static" data (like nations and regions of the world) from "per-deploy" data (like some configurations).
Using the tag twice not works.
Is there something wrong?
It is possible to do what i want?
The persistence unit is used in a EAR. I use Wildfly and eclipselink 2.5.2 as persistence provider
I have a Java application which uses JDBC in order to connect to a Postgres database and JPA to perform operations on it. I wish to use the JTA transaction type, not the local one. For that, I need to specify a data source.
Despite reading this thread, I still have no idea what to actually put in the xml file, as I have no idea how to retrieve the name of my datasource, and/or where and how to define it.
Connection to the database already works without a problem when I use the RESOURCE-LOCAL transaction type. A lot of threads I skimmed through mentioned defining this in a file called context.xml. Does it have to be this file? As no such file has been auto generated for me when creating the JDBC database connection and I would need to create it manually.
In short, if it is possible to get the following file working by adding
<jta-data-source>something</jta-data-source>, please tell me what that something is, or how do I find out. Otherwise, please tell me how and where to define that something.
<?xml version="1.0" encoding="UTF-8"?> <persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="BankingPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>banking.Splatka</class>
<class>banking.VlastnikKonta</class>
<class>banking.FyzickaTransakce</class>
<class>banking.Klient</class>
<class>banking.PlatebniKarta</class>
<class>banking.Transakce</class>
<class>banking.Uver</class>
<class>banking.Platba</class>
<class>banking.Konto</class>
<class>banking.BankovniPrevod</class>
<class>DB_control.Transakceprevod</class>
<class>banking.Transakceprevod</class>
<class>banking.TransakcePrevod</class>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://xxxxxxxxxx"/>
<property name="javax.persistence.jdbc.password" value="xxxx"/>
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver"/>
<property name="javax.persistence.jdbc.user" value="xxxxxxxxxxx"/>
<property name="javax.persistence.schema-generation.database.action" value="create"/>
</properties> </persistence-unit> </persistence>
<jta-data-source>something</jta-data-source>
something will be the jndi name of your datasource in J2EE enviornment.
When you are referring to any datasource you don't need to put below part in you persistence.xml.
<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://xxxxxxxxxx"/>
<property name="javax.persistence.jdbc.password" value="xxxx"/>
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver"/>
<property name="javax.persistence.jdbc.user" value="xxxxxxxxxxx"/>
I have the following config in the persistence.xml of my jpa app:
<properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:h2:c:/workdir/db/dev;AUTO_SERVER=TRUE"/>
<property name="javax.persistence.jdbc.user" value=""/>
<property name="javax.persistence.jdbc.password" value=""/>
<properties>
I suppose it's called 'Automatic Mixed Mode' and i should be able to access it using the jdbc:h2:file:c:/workdir/db/dev url in the h2 console.
I start the h2 console:
java -jar h2-1.3.172.jar -url jdbc:h2:file:c:/workdir/db/dev
Then i see only INFORMATION_SCHEMA and no tables created by my app.
What's wrong ?
Ok, it's because the jpa app is using a different version of h2 jar. So the fix is to use the same versions of h2 jar everywhere.
I am involved in writing a project which requires servlet->database connection. I am collaborating with another person who have designed a database using HyperSQL (hsqldb), I am now trying to merge my project with his by adding his code to mine.
Further to my issue though. When I copy the code, it works, usually. I have few methods that use the data from the database and compare them with user input.
When attempting to connect to the database, I would randomly succeed or fail, getting the following error ;
Unable to acquire a connection from driver [null]
I of course initialise a driver ;
Class.forName("org.hsqldb.jdbcDriver").newInstance();
Now, when running my method, it sometimes succeeds, and sometimes fails, here is the XML file for the DB;
<?xml version="1.0" encoding="UTF-8"?>
<!--
Creates both the HyperSQL databases using hibernate. No password or username is set.
-->
<persistence version="1.0" 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_1_0.xsd">
<persistence-unit name="monsters" transaction-type="RESOURCE_LOCAL">
<class>databaseManagement.Monster</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
<property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
<property name="hibernate.connection.username" value=""/>
<property name="hibernate.connection.password" value=""/>
<property name="hibernate.connection.url" value="jdbc:hsqldb:monsters"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
</properties>
</persistence-unit>
<persistence-unit name="users" transaction-type="RESOURCE_LOCAL">
<class>databaseManagement.User</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
<property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
<property name="hibernate.connection.username" value=""/>
<property name="hibernate.connection.password" value=""/>
<property name="hibernate.connection.url" value="jdbc:hsqldb:users"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
</properties>
</persistence-unit>
</persistence>
Probably an attempt is made to open the database in a readonly directory.
You need to specify a username for both persistence units. The default username is "SA".
The file path of the database that you specify in the URL is relative. It resolves to the execution directory. As you are developing a web application, you need to specify a directory that can be written to.
One way of doing this is by including a variable in the path, such as "jdbc:hsqldb:file:{$directorypath}/monsters" where the directorypath is the name of the web application's data dirctory, as specified in your web.xml file.
I have a standalone java application, which uses JPA for its persistence.
Right now I have a persistence.xml in META-INF.My application is currently in development.
My question is that if I move from development to the next envirnoment, say QA. I have to modify the persistence.xml and rebuild the jar. Is this the right way to go about it ?
If not,if I move the connection properties to a different file, where should this file be placed?
<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="pu1" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>ClassA</class>
<class>ClassB</class>
<class>ClassC</class>
<class>ClassD</class>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle9Dialect" />
<property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.connection.username" value="username" />
<property name="hibernate.connection.password" value="password" />
<property name="hibernate.connection.url"
value="url" />
<property name="hibernate.max_fetch_depth" value="3" />
<property name="hibernate.archive.autodetection" value="class" />
</properties>
</persistence-unit>
</persistence>
Thanks in advance !
That's a good question. Normally, you put all these environment settings in an external file, say application.properties, and pass the location to it to the JVM when you start your application (e.g. -Dconfig.location=/conf/)
Then you should find a way to get the externalized properties into your EntityManagerFactory. You can't do that in persistence.xml, you can only hard-code things there. But you can do it when creating the entity manager factory by passing vendor properties.
If using a framework like spring, for example, this is easier to do, as spring provides a factory bean for the entity manager. Otherwise you should handle it yourself. Here's the relevant bit from spring:
provider.createEntityManagerFactory(persistenceUnitInfo, getJpaPropertyMap())