i want to query a mongodb here my code
Persistence.xml
<?xml version="1.0"?>
<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="primary" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ogm.jpa.HibernateOgmPersistence</provider>
<properties>
<property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.JBossStandAloneJtaPlatform"/>
<property name="hibernate.ogm.datastore.provider" value="mongodb" />
<property name="hibernate.ogm.datastore.database" value="******" />
<property name="hibernate.ogm.datastore.host" value="******" />
<property name="hibernate.ogm.datastore.port" value="******" />
<property name="hibernate.ogm.datastore.username" value="******" />
<property name="hibernate.ogm.datastore.password" value="******" />
</properties>
</persistence-unit>
</persistence>
Flux.java
#Entity
#Table(catalog="f12", schema="public", name="enl_flux_f12_entry")
public class enl_flux_f12_entry{
#Id
public String id;
public String SYS_FluxName;
public byte[] SYS_ReadDateTime;
public String SYS_BaseNameZip;
public Long SYS_Status;
public String SYS_DateCreaERDF;
}
main
public static void main(String[] args) throws ClassNotFoundException{
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory( "primary" );
EntityManager entityManager = entityManagerFactory.createEntityManager();
entityManager.getTransaction().begin();
enl_flux_f12_entry f = entityManager.find(Flux.class, "*id*");
System.out.println(f.id);
entityManager.flush();
entityManager.close();
}
mongodb
{
"_id" : ObjectId("rzerzer"),
"SYS_FluxName" : "zerzerze.xml",
"SYS_ReadDateTime" : Timestamp(6300883749567463, 83),
"SYS_BaseNameZip" : "rferfer.zip",
"SYS_Status" : NumberLong(1),
"SYS_DateCreaERDF" : "2016-03-01T20:38:48Z"
}
The problem is that entityManager.find return always null. Is there any problem in my code?
I think it returns null because something odd in the mapping or in the JSON object and it cannot find the entity you are looking for.
The JSON object you want to get has _id: ObjectId("rzerzer"), this doesn't look right because an ObjectId in MongoDB should be:
The 12-byte ObjectId value consists of:
a 4-byte value representing the seconds since the Unix epoch,
a 3-byte machine identifier,
a 2-byte process id, and
a 3-byte counter, starting with a random value.
Even if the object in the DB is right, it is mapped as a String, so Hibernate OGM does not expect an ObjectId.
The mapping of the id on the entity should be:
#Id
#Type(type = "objectid")
public String id;
or
#Id
public ObjectId id;
Another strange thing is the way you are using find:
enl_flux_f12_entry f = entityManager.find(Flux.class, "*id*");
the find method requires the exact id of the entity. If the mapping is right, this should work entityManager.find(Flux.class, "rzerzer");
If you are not sure about the id value in the db you can also use HQL:
List<Flux> entries = entityManager.createQuery( "from Flux" ).list();
Related
i'm trying to make a simple multitenant example to run, using Eclipselink 2.5.2, and MySQL.
When trying to persist an entity asigned to a tenant id, mysql server throws an error: "Table 'jpatest.tenant1_userdata' doesn't exist". (userdata being the entity, jpatest the database name, and tenant1 the tenant-id)
The table indeed doesn't exist, the database jpatest do exist. I was expecting eclipselink to autogenerate the tables each time i try to persist with a new tenant id.
So the question would be:
How can i force Eclipselink to create the tables?
If that is not possible; How can i create tables at runtime?
Here's the code:
Entity:
#Entity
#Table(name = "userdata")
#Multitenant(value = MultitenantType.TABLE_PER_TENANT)
#TenantTableDiscriminator(type = TenantTableDiscriminatorType.PREFIX, contextProperty = "tenant-id")
public class UserData implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
private static final long serialVersionUID = 1L;
private String name;
.
.
.
persistence.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="MultiTeanantTest" transaction-type="RESOURCE_LOCAL">
<class>UserData</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/jpatest" />
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="" />
<property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
<property name="javax.persistence.schema-generation.create-database-schemas" value="true"/>
<property name="eclipselink.ddl-generation" value="create-tables"/>
</properties>
</persistence-unit>
</persistence>
Main class:
public class Main {
public static void main(String[] args) {
UserData ud = new UserData();
ud.setNombre("John);
Map properties = new HashMap<>();
properties.put("tenant-id", "tenant1");
EntityManagerFactory emf = Persistence.createEntityManagerFactory("MultiTeanantTest", properties );
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
em.persist(ud);
em.getTransaction().commit();
}
}
Hope someone can give me a tip in what i'm doing wrong.
DDL generation will not be supported in a Multitenant Scenario by Eclipselink.
Refer to this link for more information, https://wiki.eclipse.org/EclipseLink/DesignDocs/Multi-Tenancy/TablePerTenant
I'm working on an web application using Hibernate 4, Spring 3. I'm struggling with an issue for days.
In the application I have an entity class named 'User':
#Entity
public class User {
#Id
private int uid;
#Column(unique = true)
private String username;
private String password;
private boolean confirmed;
//... getters and setters
}
This entity class is mapped from a table of db called 'user'.
There is another entity class named 'Confirmation':
#Entity
#NamedQueries({
#NamedQuery(name = "getAllConfirmations", query = "select c from Confirmation c")
})
public class Confirmation {
#Id
private String username;
private boolean confirmed;
//... getters and setters
}
This entity class is mapped from a view of db called 'confirmation'.
create view confirmation
as
select username,confirmed from user
I have a method in my service class to get list of all Confirmation object:
public List<Confirmation> getListOfConfirmations() {
Query query = entityManager.createNamedQuery("getAllConfirmations");
return query.getResultList();
}
Also, there's a method to confirm User objects- set confirmed field 'true':
public int confirmUser(int uid) {
User user = getUser(uid);
if (user != null) {
user.setConfirmed(true);
try {
entityManager.getTransaction().begin();
entityManager.merge(user);
entityManager.getTransaction().commit();
return 1;
} catch (Exception e) {
e.printStackTrace();
}
}
return 0;
}
When I call confirmUser() it works fine and User object and it's row in database would be changed, But when I call getListOfConfirmations() after changes no change would be viewed in the result list.
It seems, by default, hibernate caches query result of views.
Is there any way to prevent hibernate to prevent caches this result.
In addition, I've tried #Cacheable(false) for Confirmation class or set #QueryHint(name = "org.hibernate.cacheable", value = "false") for getAllConfirmations named query, these don't work.
Persistence config:
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
<persistence-unit name="MyPU" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>bob.jpacache.Confirmation</class>
<class>bob.jpacache.User</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost/cachetest"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.connection.password" value="root"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
</properties>
</persistence-unit>
</persistence>
Thanks, in advance, for your help.
#Cacheable refers to the second-level cache and your problem seems to me that it is in the first level cache. I believe that the problem is in the life cycle of your EntityManager (at what time you create a new, at what time you close it), do a simple test: after the change of the User's objects, try call entityManager.clear () and then query your Confirmation object. NOTE: entityManager.clear () must be called on the same EntityManager that will be used to make the query.
Another detail, do not know what his real purpose, but the query has no filter. Thus, whether the User has to confirm or not, will always bring all records of User table.
I'm using Hibernate 4.3.6 and Glassfish 4.0 for my ejb project.
My test Dao class :
#PersistenceContext
private EntityManager entityManager;
public void saveTest(){
Foo testFoo = new Foo();
testFoo.setSomething("test");
entityManager.persist(testFoo);
entityManager.flush();
}
and POJO class Foo.class:
#Entity
#Table(name = "FOO")
public class Foo implements Serializable {
private static final long serialVersionUID = 1L;
private Long id;
private String something;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "T_ID", unique = true, nullable = false, precision = 15, scale = 0)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
#Column(name = "T_SOMETHING", length = 50)
public String getSomething() {
return something;
}
public void setSomething(String something) {
this.adi = something;
}
}
persistence.xml :
<?xml version="1.0" encoding="UTF-8"?>
<persistence 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"
version="2.1">
<persistence-unit name="TestAppUnit" transaction-type="JTA">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<jta-data-source>jdbc/TestApp</jta-data-source>
<class>com.example.test.Foo</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.transaction.jta.platform"
value="org.hibernate.service.jta.platform.internal.SunOneJtaPlatform" />
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle9iDialect" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
</properties>
</persistence-unit>
</persistence>
I can list table data, get data with query and i can remove data from table. But i can't persist or merge.
Exception is:
IllegalArgumentException occurred calling getter of com.example.test.Foo.id
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:192)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:346)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4746)
at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4465)
at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:243)
at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:511)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:100)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:684)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:676)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:671)
....
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:169)
Where am I doing wrong?
This project working on Glassfish 3.1 with persistence.xml version 1.0(jpa) and without this line :
<property name="hibernate.transaction.jta.platform"
value="org.hibernate.service.jta.platform.internal.SunOneJtaPlatform" />
Thanks in advance
I found it. Maybe others they encounter this problem. I wanted to share the solution.
The problem caused from Hibernate and "#PersistenceContext" annotation.
I change to Hibernate version to 4.3.5 and problem solved. Hibernate 4.3.6 and 4.3.7 has same problem. It's caused by different classloaders. Ejb Classloader and web app Classloader is different.
I using using maven simple java project
Im getting the following exception while running the main class
346 INFO [main] openjpa.Runtime - OpenJPA dynamically loaded the class
enhancer. Any classes that were not enhanced at build time
will be enhanced when they are loaded by the JVM.
414 INFO [main] openjpa.Runtime - Starting OpenJPA 2.3.0
<openjpa-2.3.0-r422266:1540826 fatal user error>
org.apache.openjpa.persistence.ArgumentException: The persistence provider is
attempting to use properties in the persistence.xml file to resolve the data
source. A Java Database Connectivity (JDBC) driver or data source class name
must be specified in the openjpa.ConnectionDriverName or
javax.persistence.jdbc.driver property. The following properties are available
in the configuration: "org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl#442ce698".
at org.apache.openjpa.jdbc.schema.DataSourceFactory.newDataSource(DataSourceFactory.java:72)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.createConnectionFactory(JDBCConfigurationImpl.java:849)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDBDictionaryInstance(JDBCConfigurationImpl.java:602)
at org.apache.openjpa.jdbc.meta.MappingRepository.endConfiguration(MappingRepository.java:1518)
at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:535)
at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:460)
at org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:121)
at org.apache.openjpa.conf.MetaDataRepositoryValue.instantiate(MetaDataRepositoryValue.java:68)
at org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:83)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.newMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:967)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.getMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:958)
at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:643)
at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:203)
at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:155)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:226)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:153)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:59)
at org.msharma.JpaImpl.main(JpaImpl.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
My entity clas
#Entity(name ="customer")
public class Customer implements Serializable{
#Id
#Column(name ="cust_id", nullable = false)
#GeneratedValue(strategy = GenerationType.AUTO)
private long custId;
#Column(name = "first_name",length = 50, nullable = false)
private String firstName;
#Column(name = "last_name",length = 50)
private String lastName;
// By default column name is same as attribute name
private String street;
private String appt;
private String city;
#Column(name = "zip_code",length = 50, nullable = false)
private String zipCode;
#Column(name = "cust_type",length = 50, nullable = false)
private String custType;
#Version
#Column(name = "last_updated_time")
private Date updatedTime;
public Customer(){}
// getters and setters
}
This is my persistence.xml
<?xml version="1.0"?>
<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="testjpa" transaction-type="RESOURCE_LOCAL">
<provider>
org.apache.openjpa.persistence.PersistenceProviderImpl
</provider>
<class>org.somepack.Customer</class>
<properties>
<property name="openjpa.ConnectionURL"
value="jdbc:mysql://localhost:3306/test"/>
<property name="openjpa.ConnectionDriverName"
value="com.mysql.jdbc.Driver"/>
<property name="openjpa.ConnectionUserName" value="root"/>
<property name="openjpa.ConnectionPassword" value="pass"/>
<property name="openjpa.Log" value="SQL=TRACE"/>
</properties>
</persistence-unit>
</persistence>
This is my mainClass
public static void main(String[] args) {
try {
EntityManagerFactory entityManagerFactory = Persistence
.createEntityManagerFactory("testjpa");
EntityManager entityManager = entityManagerFactory.createEntityManager();
EntityTransaction entityTransaction = entityManager.getTransaction();
entityTransaction.begin();
Customer customer = new Customer();
//set the properties to the customer object
entityManager.persist(customer);
entityTransaction.commit();
entityManager.close();
entityManagerFactory.close();
}
catch (Exception e){
e.printStackTrace();
}
}
How do I resolve the problem .
I have openjpa, openjpa-persistence-jdbc, mysql-connector-java dependencies in my POM.xml
and my persistence.xml is under src/main/resources
As you said your persistence.xml is under src/main/resources so may be it is unable to read it
you must place it under src/main/resources/META-INF
One more thing add
<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/>
to your persistence.xml.
If you add the openjpa.jdbc.SynchronizeMappings property as shown below OpenJPA will auto-create all your tables, all your primary keys and all foreign keys exactly to match your objects
Add <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" /> to your persistence.xml:
<?xml version="1.0"?>
<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="testjpa" transaction-type="RESOURCE_LOCAL">
<provider>
org.apache.openjpa.persistence.PersistenceProviderImpl
</provider>
<class>org.somepack.Customer</class>
<properties>
<property name="openjpa.ConnectionURL"
value="jdbc:mysql://localhost:3306/test"/>
<property name="openjpa.ConnectionDriverName"
value="com.mysql.jdbc.Driver"/>
<property name="openjpa.ConnectionUserName" value="root"/>
<property name="openjpa.ConnectionPassword" value="pass"/>
<property name="openjpa.Log" value="SQL=TRACE"/>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
</properties>
</persistence-unit>
</persistence>
I'm using datanucleus 3.2.7 from Maven, trying to use the Amazon S3 JPA provider. I can successfully write data into S3, but querying either by using "SELECT u FROM User u" or "SELECT u FROM User u WHERE id = :id" causes a NullPointerException to be thrown when I call query.getResultList().
Using the RDBMS provider, everything works perfectly. Is there something I'm doing wrong?
Main.java
EntityManagerFactory factory = Persistence.createEntityManagerFactory("MyUnit");
EntityManager entityManager = factory.createEntityManager();
Query query = entityManager.createQuery("SELECT u FROM User u", User.class);
List<User> users = query.getResultList(); // Null pointer exception here (This is line 16!)
for(User u:users)
System.out.println(u);
User.java
package test;
import javax.persistence.*;
#Entity
#Table(name = "User")
public class User {
#Id
public String id;
public String name;
public User(String id, String name) {
this.id = id;
this.name = name;
}
public String toString() {
return id+" : "+name;
}
}
persistence.xml
<?xml version="1.0" encoding="UTF-8" ?>
<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_1_0.xsd"
version="1.0">
<persistence-unit name="MyUnit">
<class>test.User</class>
<exclude-unlisted-classes />
<properties>
<properties>
<property name="datanucleus.ConnectionURL" value="amazons3:http://s3.amazonaws.com/" />
<property name="datanucleus.ConnectionUserName" value="xxxxx" />
<property name="datanucleus.ConnectionPassword" value="xxxxx" />
<property name="datanucleus.cloud.storage.bucket" value="my-bucket" />
</properties>
<property name="datanucleus.autoCreateSchema" value="true" />
</properties>
</persistence-unit>
</persistence>
Exception
java.lang.NullPointerException
at org.datanucleus.NucleusContext.isClassWithIdentityCacheable(NucleusContext.java:1840)
at org.datanucleus.ExecutionContextImpl.getObjectFromLevel2Cache(ExecutionContextImpl.java:5287)
at org.datanucleus.ExecutionContextImpl.getObjectFromCache(ExecutionContextImpl.java:5191)
at org.datanucleus.ExecutionContextImpl.findObject(ExecutionContextImpl.java:3137)
at org.datanucleus.store.json.CloudStoragePersistenceHandler.getObjectsOfCandidateType(CloudStoragePersistenceHandler.java:367)
at org.datanucleus.store.json.query.JPQLQuery.performExecute(JPQLQuery.java:94)
at org.datanucleus.store.query.Query.executeQuery(Query.java:1786)
at org.datanucleus.store.query.Query.executeWithMap(Query.java:1690)
at org.datanucleus.api.jpa.JPAQuery.getResultList(JPAQuery.java:194)
at test.Main.main(Main.java:16)
This error appears to be happening as datanucleus deserializes the JSON for an entry. Deleting everything from the bucket returns the empty set without incident. By turning off L2 Caching, I made the exception occur somewhere else. It seems that ExecutionContextImpl.findObject is being given a null id.
datanucleus-json version 3.2.1 likely fixes that, but that's for you to confirm