I made small rest ws to learn rest. With out using EntityManager its run fine. But when i'm using EntityManager it'll give NPE. I'm using jboss-eap-6.2,EJB 3, JPA. After google that error find out EntityManager is null. How to solve this problem.
#Stateless
#Path("/dili")
public class TestResource {
#PersistenceContext(unitName = "AjaxrestPU")
private EntityManager em;
#GET
#Path("{key}")
#Produces("application/xml")
public Customer getMsg(#PathParam("key") int key) {
Customer cu = em.find(Customer.class, 1);
System.out.println("key " + key);
return cu;
}
//return "okkkk";
}
persistance.xml
<persistence-unit name="AjaxrestPU" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:/tutes</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.hbm2ddl.auto" value="create"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
</properties>
</persistence-unit>
Error in boss
13:09:38,862 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default
host].[/Ajaxrest].[org.test.ApplicationConfig]] (http-/127.0.0.1:8080-2) JBWEB0
0236: Servlet.service() for servlet org.test.ApplicationConfig threw exception:
org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException
at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationExcep
ion(SynchronousDispatcher.java:365) [resteasy-jaxrs-2.3.7.Final-redhat-2.jar:2.
.7.Final-redhat-2]
After 2 hrs of searching found answer.
Making empty beans.xml in web-inf. That all.
https://netbeans.org/bugzilla/show_bug.cgi?id=231595
Related
I'm trying to run a simple web application on which I want run some tests on Jakarta EE 9.1(Full platform). I deployed my application on Glassfish 6.2.5. While I was running some code with jpa implementation this exception is thrown(the persistence provider is EclipseLink 3.0.2):
jakarta.persistence.PersistenceException: Exception [EclipseLink-4002]
(Eclipse Persistence Services - 3.0.2.v202107160933):
org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306;create=true Error Code: 0
The persistence.xml is:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_0.xsd"
version="3.0">
<persistence-unit name="GestoreDB" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>testJPA.ValueBeen</class>
<properties>
<property name="jakarta.persistence.schema-generation.action" value="drop-and-create"/>
<property name="jakarta.persistence.schema-generation.scripts.create-target" value="database-and-scripts"/>
<property name="jakarta.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
<property name="jakarta.persistence.jdbc.url" value="jdbc:mysql://localhost:3306;create=true"/>
<property name="jakarta.persistence.jdbc.user" value="root"/>
<property name="jakarta.persistence.jdbc.password" value="myPwd"/>
</properties>
</persistence-unit>
</persistence>
The Entity is(getters and setters omitted):
#Entity
#NamedQuery(name = "ValueBeen.selectTable", query = "select u from ValueBeen u")
public class ValueBeen
{
public ValueBeen(){
}
public ValueBeen(String value)
{
this.value = value;
}
public ValueBeen(int id, String value)
{
this.id = id;
this.value = value;
}
#Id
#GeneratedValue
private int id;
#NotNull
private String value;
...
}
And the WebServlet who perform persistency is:
#WebServlet(name = "helloServlet", value = "/hello-servlet")
public class HelloServlet extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException
{
ValueBeen valueBeen=new ValueBeen("Hello");
//Manager persistence and manager been
EntityManagerFactory managerPersistence = Persistence.createEntityManagerFactory("GestoreDB");
EntityManager entityManager = managerPersistence.createEntityManager();
//Do persistence
EntityTransaction transaction = entityManager.getTransaction();
transaction.begin();
entityManager.persist(valueBeen);
transaction.commit();
//close managers
entityManager.close();
managerPersistence.close();
}
}
I put the jdbc connector jar (Mysql connector 8.0.28) in .\glassfish-6.2.5\glassfish\domains\domain1\lib
As you deploy your app to glassfish container then "transaction-type" in persistence.xml i guess should be "JTA", and property "jakarta.persistence.jdbc.url" is invalid because you do not indicate any database / schema name after ":3306". Glassfish documentation provides instructions and examples how to setup global jdbc connections and those limited to only application scope.
I'm making a Restful web service using netbeans, tomcat, jpa and jax-rs. I have this error since I've add the <class /> tags to my persistence.xml for all of my classes (And I need them to make a select).
The error is : https://gist.github.com/anonymous/bb37c28cdb3dbdf721c5206bfa6369c3
And my persistence.xml is :
<?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="NataRestServicePU" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>model.Media</class>
<class>model.MediaTypeDB</class>
<class>model.Message</class>
<class>model.Observation</class>
<class>model.Session</class>
<class>model.Species</class>
<class>model.User</class>
<class>model.UserType</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3307/natagora?zeroDateTimeBehavior=convertToNull"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="javax.persistence.jdbc.password" value="password"/>
<property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/>
</properties>
</persistence-unit>
</persistence>
And this is the main dao (that worked before, didn't change anything) but without all the CRUD methods (just the read for example)
package dao;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;
public class MainDAO<T> implements IMainDAO<T> {
protected Class<T> clazz;
private final EntityManagerFactory factory;
private static final String PERSISTENCE_UNIT_NAME = "NataRestServicePU";
#PersistenceContext(unitName = "NataRestServicePU")
protected EntityManager entityManager;
public MainDAO(Class<T> type){
clazz = type;
factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
}
public void setClazz(Class<T> clazzToSet) {
this.clazz = clazzToSet;
}
#Override
public T read(int id){
try{
newEntityManager();
return entityManager.find(clazz,id);
}finally{
closeEntityManager();
}
}
protected void closeEntityManager(){
entityManager.close();
}
protected void newEntityManager(){
entityManager = factory.createEntityManager();
}
}
I'm receiving this error:
javax.servlet.ServletException: java.lang.IllegalStateException:
Exception Description: Cannot use an EntityTransaction while using JTA.
While trying to use JPA and JAVAEE, Glassfish.
My persistence.xml file is as follow:
<?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="acmeauction">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/MySQLJDBCResource</jta-data-source>
<class>it.uniroma3.acme.auction.model.User</class>
<class>it.uniroma3.acme.auction.model.Auction</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/acmeauction"/>
<property name="javax.persistence.jdbc.user" value="user"/>
<property name="javax.persistence.jdbc.password" value="password"/>
</properties>
</persistence-unit>
</persistence>
What i'm trying to do is to persist an object (User), in this way:
#ManagedBean
public class UserRepository implements Serializable{
#PersistenceUnit
EntityManagerFactory emf;
#PersistenceContext
private EntityManager em;
private static UserRepository instance;
/**
* Gives back the singleton UserRepository singleton.
*/
public static UserRepository getInstance() {
if (instance==null) {
instance = new UserRepository();
}
return instance;
}
private UserRepository() {
emf = Persistence.createEntityManagerFactory("acmeauction");
em = emf.createEntityManager();
}
/**
* Save and persist a new User.
*/
public void save(User user) {
em.getTransaction().begin();
em.persist(user);
em.getTransaction().commit();
}
}
While if it try to use UserRepository from a simple Java application, it works correctly.
Thanks in advance,
AN
You are not supposed to use em.getTransaction().begin(); nor em.getTransaction().commit();, these instructions are to be used with RESOURCE_LOCAL transaction type.
In your case the transaction is managed by the container, in the first use of the EntitiyManager in your method, the container checks whether there is an active transaction or not, if there is no transaction active then it creates one, and when the method call ends, the transaction is committed by the container. So, at the end your method should look like this:
public void save(User user) {
em.persist(user);
}
The container takes care of the transaction, that is JTA.
As the error states, if you are using JTA for transactions, you need to use JTA.
Either use JTA UserTransaction to begin/commit the transaction, or use a RESOURCE_LOCAL persistence unit and non-jta DataSource.
See,
http://en.wikibooks.org/wiki/Java_Persistence/Transactions
I have a JSF application that uses Eclipse Persistence Services - 2.1.1.v20100817-r8050, and I sometimes get the following error:
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.1.1.v20100817-r8050): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Invalid state, the Connection object is closed.
Error Code: 0
Call: SELECT XXXXX FROM XXXXX
bind => [/Home/Footer/]
Query: ReadAllQuery(name="WWW.find" referenceClass=WWW sql="SELECT XXXXX FROM XXXXX")
I have no idea what is causing it. The exception is thrown in the following function on the "return q.getResultList();" line.
public List<WWW> find(String url) {
}
EntityManager em = getEntityManager();
try {
Query q = em.createNamedQuery("WWW.find");
q.setParameter("url", url);
return q.getResultList();
} finally {
em.close();
}
}
We have SQL Server 2005 and the database isn't down. This is more of a recent thing to consistently happen. Below is the properties that we set in the persistence.xml file. Any comments on what should change in this?
<properties>
<property name="javax.persistence.jdbc.password" value="password"/>
<property name="javax.persistence.jdbc.user" value="user"/>
<property name="javax.persistence.jdbc.driver" value="net.sourceforge.jtds.jdbc.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:jtds:sqlserver://SERVER:1433/DB"/>
<property name="eclipselink.ddl-generation" value="none"/>
<property name="eclipselink.jdbc.timeout" value="20"/>
<property name="eclipselink.jdbc.connections.wait-timeout" value="20"/>
<property name="javax.persistence.query.timeout" value="20"/>
<property name="eclipselink.allow-zero-id" value="true"/>
</properties>
Here is my edited class
public class WWWJpaController {
public WWWWJpaController() {
emf = Persistence.createEntityManagerFactory("properties");
}
public WWWWJpaController(String unitName) {
emf = Persistence.createEntityManagerFactory(unitName);
}
private EntityManagerFactory emf = null;
public EntityManager getEntityManager() {
return emf.createEntityManager();
}
public List<WWW> find(String url) {
EntityManager em = getEntityManager();
try {
Query q = em.createNamedQuery("WWW.find");
q.setParameter("url", url);
return q.getResultList();
}finally{
em.close();
}
}
}
My guess is your database connection has timed out, or your database is down.
You may need to retry the query, or re-connect your session.
How have you configured your connection pooling and what database are you using?
Maybe your aplication server is not able to reconnect to the database, as BalusC pointed out in his comment, this happens every time the backup's done.
You can make your server reconnect as pointed in this link for Jboss
With this 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="ODP_Server_Test"
transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<!-- <non-jta-data-source>osgi:service/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/ODPServerDataSource)</non-jta-data-source> -->
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
<property name="javax.persistence.jdbc.url" value="jdbc:derby:memory:unit-testing;create=true" />
<property name="javax.persistence.jdbc.user" value="" />
<property name="javax.persistence.jdbc.password" value="" />
<property name="eclipselink.ddl-generation" value="drop-and-create-tables" />
<property name="eclipselink.target-database" value="DERBY" />
</properties>
</persistence-unit>
</persistence>
and a simple test:
public class RepositoryTest {
private static Logger logger = LoggerFactory
.getLogger(RepositoryTest.class);
private static EntityManagerFactory emf;
private EntityManager em;
private RepositoryImpl repo = new RepositoryImpl();
#BeforeClass
public static void setUp() {
try {
logger.info("Starting in-memory DB for unit tests");
#SuppressWarnings("unused")
Class<?> cls = org.apache.derby.jdbc.EmbeddedDriver.class;
DriverManager.getConnection(
"jdbc:derby:memory:unit-testing;create=true").close();
} catch (Exception ex) {
ex.printStackTrace();
fail("Exception during database startup.");
}
try {
logger.info("Building JPA EntityManager for unit tests");
emf = Persistence.createEntityManagerFactory("ODP_Server_Test");
} catch (Exception ex) {
ex.printStackTrace();
fail("Exception during JPA EntityManager instantiation.");
}
}
#AfterClass
public static void tearDown() throws SQLException {
logger.info("Shutting down JPA");
if (emf != null) {
emf.close();
}
try {
DriverManager.getConnection(
"jdbc:derby:memory:unit-testing;drop=true").close();
} catch (SQLException ex) {
if (ex.getSQLState().equals("08006")) {
logger.info("DB shut down");
} else {
throw ex;
}
}
fail("DB didn't shut down");
}
#Before
public void setEM() {
em = emf.createEntityManager();
repo.setEntityManager(em);
}
#After
public void flushEM() {
if (em != null) {
em.flush();
em.close();
em = null;
}
}
#Test
public void noBlocksInEmptyDB() {
assertThat(repo.findFunBlock(1), is((FunctionalBlock) null));
}
}
I get
[EL Warning]: 2012-04-17 15:08:18.476--The collection of metamodel types is empty. Model classes may not have been found during entity search for Java SE and some Java EE container managed persistence units. Please verify that your entity classes are referenced in persistence.xml using either <class> elements or a global <exclude-unlisted-classes>false</exclude-unlisted-classes> element
After replacing <exclude-unlisted-classes>false</exclude-unlisted-classes> with a lot of <class> elements, the problem can be fixed, but I'd prefer not to have to remember to edit persistence.xml every time I need to add a new entity or remove an old one. Why doesn't the version with <exclude-unlisted-classes> work?
I had faced similar situation
If I generate JPA metamodel, copy paste it in correct pacakge and check it in to svn, and disable metamodel generation, all junit tests were fine
if i generate metamodel with every build, at junit time - embedded glassfish will find all ejb and metamodel fine, but non ejb junit will fail
I had to do this in my src/test/resources/META-INF/persistence.xml
<persistence-unit name="test-xxx" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<jar-file>file:../classes</jar-file>
<shared-cache-mode>ALL</shared-cache-mode>
<properties>
<property name="eclipselink.target-database" value="org.eclipse.persistence.platform.database.oracle.Oracle11Platform"/>
<property name="eclipselink.logging.timestamp" value="true"/>
<property name="eclipselink.logging.thread" value="true"/>
<property name="eclipselink.logging.level" value="FINE"/>
<property name="eclipselink.logging.parameters" value="true"/>
<property name="eclipselink.logging.logger" value="JavaLogger"/>
<property name="javax.persistence.jdbc.url" value="jdbc:oracle:thin:#localhost:1521:xxx"/>
<property name="javax.persistence.jdbc.password" value="xxx"/>
<property name="javax.persistence.jdbc.driver" value="oracle.jdbc.OracleDriver"/>
<property name="javax.persistence.jdbc.user" value="xxx"/>
</properties>
</persistence-unit>