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How to handle 'IllegalBlockSizeException' when creating EntityManager with EclipseLink version 2.6.4?

I'm using EclipseLink and Java Persistence API to connect to local database, however when I'm creating EntityManager object, I'm getting following error:
[EL Severe]: ejb: 2017-06-04 19:29:55.066--ServerSession(1644987969)--Exception [EclipseLink-7107] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Error encountered during string decryption.
Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-7107] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Error encountered during string decryption.
Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
Error stack trace point at line where I create EntityManager:
private EntityManagerFactory factory;
private EntityManager em;
public JpaDatabaseConnection() {
factory = Persistence.createEntityManagerFactory("blogspace");
em = factory.createEntityManager();
}
I've added eclipselink and java persistence API through Maven Dependencies and JDBC driver to project classpath. This is my persistence.xml file (located in META-INF directory in folder with project packages):
<?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="blogspace" transaction-type="RESOURCE_LOCAL">
<class>pl.furman.server.database.entities.User</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost/blogspace" />
<property name="javax.persistence.jdbc.user" value="blogserver" />
<property name="javax.persistence.jdbc.password" value="123456" />
<!-- EclipseLink should create the database schema automatically -->
<property name="eclipselink.ddl-generation" value="create-tables" />
<property name="eclipselink.ddl-generation.output-mode" value="database" />
</properties>
</persistence-unit>
</persistence>
What is the cause of problem and how it can be solved? I know that JDBC driver itself probably is working correctly because when I intentionally put wrong password into persistence.xml file I'm getting error about failed authorization. Database is set up and working because I can create queries and insert data into database from shell and from eclipse toad extension.
Thank you in advance for help.
Edit: Problem lies in user name and/or password in persistence.xml. When I changed it to user and password of different length, connection works without problems. However still I have no idea why that was happening.

I can confirm the odd behaviour with EclipseLink version 2.6.4, as I reproduced your setup . Here's the full stack trace:
Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:815)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303)
at demo.service.UserService.<init>(UserService.java:14)
at demo.Runner.main(Runner.java:8)
Caused by: Exception [EclipseLink-7107] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Error encountered during string decryption.
Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
at org.eclipse.persistence.exceptions.ValidationException.errorDecryptingPassword(ValidationException.java:894)
at org.eclipse.persistence.internal.security.JCEEncryptor.decryptPassword(JCEEncryptor.java:114)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateLogins(EntityManagerSetupImpl.java:2404)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateSession(EntityManagerSetupImpl.java:2716)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:710)
... 6 more
Caused by: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:934)
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:845)
at com.sun.crypto.provider.DESCipher.engineDoFinal(DESCipher.java:314)
at javax.crypto.Cipher.doFinal(Cipher.java:2165)
at org.eclipse.persistence.internal.security.JCEEncryptor.decryptPassword(JCEEncryptor.java:109)
... 9 more
It seems, this relates to a bug in org.eclipse.persistence.internal.security.JCEEncryptor. While debugging, I found that there are certain password lengths which cause the observed behaviour, e.g. for 123456.
Solution
Now the good part of my answer: This bug was fixed with version 2.6.5-RC1. Moreover, it also works as expected with the latest 2.6.5-RC2 release candidate (available since June 2017). In case you have a Maven project, change the version string of the EclipseLink dependency like so:
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.6.5-RC2</version>
</dependency>
If this is a standalone project, find the latest 2.6.5-RC2 jar file on Maven Central. Just remove the old jar file and put the new one in the application's class path.
Btw, when I changed the PW to 123456789 in the database as well as in persistence.xml it worked even with the bugged version 2.6.4. Odd, isn't it?
Hope it helps.

javax.persistence.PersistenceException by using createEntityManagerFactory

My following code is working on my Windows, but does not working on my Linux Mint. A added all libraries that are relevant.
I get this exception for the createEntityManagerFactory row:
javax.persistence.PersistenceException: Explicit persistence provider error(s) occurred for "JPA_probaPU" after trying the following discovered implementations: org.eclipse.persistence.jpa.PersistenceProvider from provider: org.eclipse.persistence.jpa.PersistenceProvider
My java file:
package jpa_proba;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.eclipse.persistence.exceptions.EntityManagerSetupException;
public class JPA_proba {
public static void main(String[] args) {
try{
EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPA_probaPU");
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
//Integer id, String isbn, String szerzo, String cim, String mufaj, int ar, int elerheto
Konyv k = new Konyv(null, "654654444444", "Kiss Béla", "Hogyan ne csináljunk semmit?", "dráma", 500, 1);
em.persist(k);
em.getTransaction().commit();
}
catch(Exception ex){
System.out.println(ex);
}
}
}
My 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="JPA_probaPU" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>jpa_proba.Konyv</class>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/helix1?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="123456"/>
</properties>
</persistence-unit>
</persistence>
Errors:
Exception in thread "main" javax.persistence.PersistenceException: Explicit persistence provider error(s) occurred for "JPA_probaPU" after trying the following discovered implementations: org.eclipse.persistence.jpa.PersistenceProvider from provider: org.eclipse.persistence.jpa.PersistenceProvider
at javax.persistence.Persistence.createPersistenceException(Persistence.java:244)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:186)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:72)
at jpa_proba.JPA_proba.main(JPA_proba.java:13)
Caused by: Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoad er#5caf905d
Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [JPA_probaPU] failed.
Internal Exception: java.lang.IncompatibleClassChangeError: Implementing class
at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:127)
at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:107)
at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:177)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:152)

You are getting Internal Exception: java.lang.IncompatibleClassChangeError: Implementing class.
This might occur when you have more than one version of same class/jar.

Cannot acquire data source whit PostgreSql. Can't use JPA EntityManager

I have the next problem:
I am doing a project using JPA and Restfull whit netbeasn and postgres, I have the following persistence
<?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="PruebaPersitenciaPU" transaction-type="JTA">
<jta-data-source>data_cotratacion</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties/>
</persistence-unit>
And also the following code using the EntityManager:
#GET
public String crearPersona(
#QueryParam("id") String id,
#QueryParam("name") String name,
#QueryParam("gender") String gender,
#QueryParam("date") String date){
Persona p = new Persona();
p.setId(id);
p.setName(name);
p.setGender(gender);
p.setDate(stringToDate(date));
try {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("PruebaPersitenciaPU");
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
em.persist(p);
em.getTransaction().commit();
return "Usuario Creado "+id;
} catch (Exception e) {
return "Usuario no creado error: "+e;
}
}
but try this sends me this error:
Usuario no creado error: javax.persistence.PersistenceException: Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.ValidationException Exception Description: Cannot acquire data source [data_cotratacion]. Internal Exception: javax.naming.NamingException: Lookup failed for 'data_cotratacion' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: data_cotratacion not found]

Sounds like there is no JDBC datasource configured with the name data_cotratacion. You need to configure this JDBC resource on your application server.
Or you need to create your persistence unit by using the wizard in netbeans go in the menu to File > New File Then select Persistence in the left box and Persistence Unit in the right box.

Generating metamodel classes with JPA 2.1

I have problems using hibernate metamodel generator:
java: Error unmarshalling /META-INF/persistence.xml with exception :
javax.xml.bind.UnmarshalException
- with linked exception:
[org.xml.sax.SAXParseException; lineNumber: 4; columnNumber: 103; cvc-elt.1: Cannot find the declaration of element 'persistence'.]
Here is my persistence.xml:
<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://www.oracle.com/webfolder/technetwork/jsc/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="wespital" transaction-type="JTA">
<jta-data-source>jdbc/wespital</jta-data-source>
</persistence-unit>
</persistence>
It seems that current version (1.2.Final) does not support JPA 2.1 and I didn't find any beta-versions of this generator in the git repository. What other options could be to generate metamodel classes? I use wildfly as app server.

A new version (1.3.0.Final) has been released on August 9, 2013 that should solve your problems.

DataNucleus JPA metamodel generator generates classes suitable for JPA 2.0/2.1, see the DataNucleus docs.

I used metamodel generator from the eclipselink project, it seems to work fine.
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<version>2.5.0</version>
<scope>provided</scope>
</dependency>

Jboss 7 not Creating Persistence Unit

I use Jboss 7 , hibernate 4.1.5 FINAL and Spring 3.1.2 for my application
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: Virtuoso] Unable to build EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:915)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:890)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:74)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.createContainerEntityManagerFactory(PersistenceUnitServiceImpl.java:162)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.start(PersistenceUnitServiceImpl.java:85)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
... 3 more
Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.service.jdbc.connections.spi.ConnectionProvider]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:186)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:150)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:223)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:89)
at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2277)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2273)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:94)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:905)
... 9 more
Caused by: org.hibernate.HibernateException: Could not instantiate connection provider [org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider]
at org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator.instantiateExplicitConnectionProvider(ConnectionProviderInitiator.java:192)
at org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator.initiateService(ConnectionProviderInitiator.java:114)
at org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator.initiateService(ConnectionProviderInitiator.java:54)
at org.hibernate.service.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:69)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:176)
... 22 more
Caused by: java.lang.ClassCastException: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider cannot be cast to org.hibernate.service.jdbc.connections.spi.ConnectionProvider
at org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator.instantiateExplicitConnectionProvider(ConnectionProviderInitiator.java:189)
... 26 more
jboss-deployment-structure.xml
<jboss-deployment-structure>
<deployment>
<exclusions>
<module name="org.hibernate"></module>
</exclusions>
</deployment>
</jboss-deployment-structure>
persistence.xml
<?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="Virtuoso" transaction-type="RESOURCE_LOCAL" >
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<non-jta-data-source>java:jboss/datasources/MySqlDS</non-jta-data-source>
</persistence-unit>
</persistence>
i am not knowing where i am going wrong..My Persistent unit not getting started.

Since you're attempting to use Hibernate 4.x packaged in your application, you should instead be setting the jboss.as.jpa.providerModule property to application in your persistence.xml configuration file.
You're better off replacing the Hibernate 4.0 module in AS7, with a newer version though. That way, you dont need to package a JPA provider in your application.

ejb3 - persistence jar was present in my lib folder which was conflicting with mu hibernate jpa 2.0 jar . so i added scope provided in my pom.xml . after that class cast exception went away.