I am trying to connect to sql server using JPA and hibernate with an Eclipse Maven project. I've tried moving the persistence.xml file to various locations but it doesn't seem to help.
My persistence.xml file is
<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="Trades" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="javax.persistence.jdbc.url" value="jdbc:sqlserver:/Trades\SQL00;databaseName=Trades" />
<property name="javax.persistence.jdbc.user" value="sa" />
<property name="javax.persistence.jdbc.password" value="dev" />
<property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>
<property name="show_sql" value="true"/>
<property name="hibernate.temp.use_jdbc_metadata_defaults" value="false"/>
</properties>
</persistence-unit>
</persistence>
and my code is as follows and is located in src/main/resources/META-INF
public static void main(String[] args) {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("Trades");
System.out.println();
}
I have attached a screenshot which shows my eclipse set up
I solved this, turned out that Maven must have downloaded corrupt libraries - I was alerted this when I was unable to view the source for some classes in the Hibernates jars. I deleted the jars in my .m2 directory and when the jars were refreshed, it worked fine. A bit of tricky one.
Related
When I am running my unit test I these two errors
org.hibernate.jpa.boot.internal.PersistenceXmlParser doResolve
INFO: HHH000318: Could not find any META-INF/persistence.xml file in the classpath
and
javax.persistence.PersistenceException: No Persistence provider for EntityManager named dbContext
I don't get them both because as you can see in the image en persistence.xml file below this text everything is there that he is complaining about.
and here you have my persistance.xml
<?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="dbContext">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.url" value="{urltodb}"/>
<property name="hibernate.connection.autocommit" value="false"/>
<property name="hibernate.connection.username" value="{myusername}"/>
<property name="hibernate.connection.password" value="{mypassword}"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
<property name="hibernate.connection.CharSet" value="utf8"/>
<property name="hibernate.connection.characterEncoding" value="utf8"/>
<property name="hibernate.connection.useUnicode" value="true"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
</properties>
</persistence-unit>
</persistence>
Your folder structure is completely mixed up:
Your src-Folder is marked as source-folder (blue), so the subfolder main is interpreted as Java-Package
Your resources-folder is within your sources/main-folder That's why Intellij interprets it as package main.resources.META-INF.
(All your real packages start with upper-case. That's not an error, but unusual nevertheless)
How your folder structure should look like:
src/main/java => Mark this as source folder and put all your java packages there
src/main/resources => Mark this as resources folder an put your META-INF there
See also: How to create a test directory in Intellij 13?
I keep getting
java.lang.ClassNotFoundException: Could not load requested class : com.ibm.db2.jcc.DB2Driver
when trying to connect to a DB2 database using Hibernate. The driver jar is referenced as an external library:
Image of Eclipse's "Referenced Library" folder
It also shows up in the classpath:
classpathentry kind="lib" path="C:/Program Files (x86)/IBM/SQLLIB/java/db2jcc.jar"/>
I can also access the class by importing it in the source code. My persistence.xml looks as follows:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="name" transaction-type="RESOURCE_LOCAL">
<description>Persistence Unit</description>
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>MyClass</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.ibm.db2.jcc.DB2Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:db2://url" />
<property name="javax.persistence.jdbc.user" value="user" />
<property name="javax.persistence.jdbc.password" value="password" />
<property name="hibernate.dialect" value="org.hibernate.dialect.DB2Dialect" />
<property name="hibernate.hbm2ddl.auto" value="create" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.format_sql" value="true" />
</properties>
</persistence-unit>
</persistence>
My suspicion why this does not work is that the class is contained in an external library and not as a maven dependency, because when I replace the DB2 driver by net.ucanaccess.jdbc.UcanaccessDriver (which is contained in a Maven package), the class will be found just fine.
Any idea what I am doing wrong here?
when you are using com.ibm.db2.jcc.DB2Driver' make sure db2jcc.jar & db2jcc_license_cu.jar are in your classpath.Please add both the jar in your classpath and give a try.
The problem was that I was using the Maven exec plugin to run the main class. W/o using Maven, it works fine...
I created a Persistence Unit in Netbeans and have since deleted the Persistence.xml file. Now whenever I run my project, I get tonnes of errors like "No Persistence provider for EntityManager named Hi__Score_OldPU". How can I get rid of my Persistence Unit entirely?
That error happen when persistence.xml is at the wrong place (Project-->WebContent-->META-INF-->persistence.xml).
It should be here (src-->META-INF-->persistence.xml)
If that folder doesn't exist you can create a folder "META-INF" at src and put persistence.xml on it.
here my persistence.xml look like this.
`
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="livraria" transaction-type ="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>br.com.k19.modelo.Editora</class>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/K21_livraria_bd"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="root"/>
</properties>
</persistence-unit>
`
I've been searching around and haven't been able to find a working fix. My persistence.xml file is located in /src/META-INF/persistence.xml, which from looking around, this is the correct location for it.
I'm using glassfish as the server, and I keep getting the following:
javax.persistence.PersistenceException: No Persistence provider for EntityManager named pers
Here is my persistence file:
<?xml version="1.0" encoding="UTF-8"?>
<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="pers" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>cs.ee.assignment2.Client</class>
<properties>
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.archive.autodetection" value="class, hbm" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/assignment2" />
<property name="hibernate.connection.password" value="root" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
</properties>
</persistence-unit>
</persistence>
Any ideas on what the problem could be would be greatly appreciated.
Hmm.. make sure you are using PeristenceUnit not context in your entity class: see http://openejb.apache.org/jpa-concepts.html
Switch to "transaction" just to see if it fails too.
Also sometimes the old classes are not unloaded from the server properly if you are doing redeployment, you may have to shut it down and restart after redeploy.
I am trying to change my web-app's JDBC code to JPA using Hibernate as provider. I am using Eclipse IDE. In that i have defined a MySQL data source. I added it in the persistence.xml.
But, I am getting the below error.
6640 [30289364#qtp-7494106-7] ERROR org.hibernate.connection.DatasourceConnectionProvider - Could not find datasource: tamSql
javax.naming.NameNotFoundException; remaining name 'tamSql'
My persistence.xml looks like,
<?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="ExpensePersistentUnit" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<non-jta-data-source>tamSql</non-jta-data-source>
<class>com.pricar.JPAInteg.Role</class>
<class>com.pricar.JPAInteg.User</class>
<class>com.pricar.JPAInteg.Userdetail</class>
<class>com.pricar.JPAInteg.Category</class>
<class>com.pricar.JPAInteg.Expens</class>
<class>com.pricar.JPAInteg.Leavetable</class>
<class>com.pricar.JPAInteg.Permissiontoken</class>
<class>com.pricar.JPAInteg.Roletokenassociation</class>
<class>com.pricar.JPAInteg.UserPK</class>
<properties>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost/officemgmt"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"></property>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.password" value="1234"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.show_sql" value="true"/>
</properties>
Any Suggestions!!!
Thanks in Advance!
You don't need <non-jta-data-source> when your datasource is configured in <properties>. <non-jta-data-source> is needed when datasource is configured in application server configuration and obtained via JNDI.