Alfresco Sessions in threads

[rrino]

Hi i'm new in alfresco and i'm trying to do some tests with uploading files into repository.
Everything was easy until i tried to run several threads with session for each one.
I got Exception  :

Exception in thread "main" javax.jcr.RepositoryException: Only one active session per thread.‍

I've tried it with JackRabbit and there is everything ok - can i do the same with Alfresco?

[mrogers]

Several threads with a session for each should be O.K.   

What you can't do is have several sessions on a single thread since theres a bunch of stuff stored in a thread local slot, including the transaction identifier.

[rrino]

Thanks for Your reply.

Now I'm doing somethig else wrong:/

In main thread i make instance of MyRepository (repository = new MyRepository())in my case:

import java.io.IOException;

import javax.jcr.Repository;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.SimpleCredentials;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyRepository {

  private static final String PASSWORD = "admin";

  private static final String LOGIN = "admin";
  
  private Repository repository;
  
  MyRepository(){
    ApplicationContext context = new ClassPathXmlApplicationContext("classpath:alfresco/application-context.xml");
    repository = (Repository) context.getBean("JCR.Repository");
  }
  

  public Session getSession() throws IOException, RepositoryException {
    System.out.println("Login… Getting new session… ");
    return repository.login(new SimpleCredentials(LOGIN, PASSWORD.toCharArray()));

  }

}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

And here goes two scenerio:

when I in thread Main make

Session session = repository.getSession();

and giva session as a argument to class constructor A (it invokes constructor in B with the session as argument too) everything works ok.

In second case when i give repository as argument of class C extends Thread constructor and in this class i make

Session session = repository.getSession();‍

 

and now give as an class A constructor argument, and when it invokes C with session and run e.g. method session.getRootNode I get exception:

     [java] net.sf.acegisecurity.AuthenticationCredentialsNotFoundException: A v
alid SecureContext was not provided in the RequestContext
     [java]     at net.sf.acegisecurity.intercept.AbstractSecurityInterceptor.cr
edentialsNotFound(AbstractSecurityInterceptor.java:477)
     [java]     at net.sf.acegisecurity.intercept.AbstractSecurityInterceptor.be
foreInvocation(AbstractSecurityInterceptor.java:355)
     [java]     at net.sf.acegisecurity.intercept.method.aopalliance.MethodSecur
ityInterceptor.invoke(MethodSecurityInterceptor.java:77)
     [java]     at org.springframework.aop.framework.ReflectiveMethodInvocation.
proceed(ReflectiveMethodInvocation.java:176)
     [java]     at org.alfresco.repo.security.permissions.impl.ExceptionTranslat
orMethodInterceptor.invoke(ExceptionTranslatorMethodInterceptor.java:49)
     [java]     at org.springframework.aop.framework.ReflectiveMethodInvocation.
proceed(ReflectiveMethodInvocation.java:176)
     [java]     at org.alfresco.repo.audit.AuditComponentImpl.auditImpl(AuditCom
ponentImpl.java:256)
     [java]     at org.alfresco.repo.audit.AuditComponentImpl.audit(AuditCompone
ntImpl.java:191)
     [java]     at org.alfresco.repo.audit.AuditMethodInterceptor.invoke(AuditMe
thodInterceptor.java:69)
     [java]     at org.springframework.aop.framework.ReflectiveMethodInvocation.
proceed(ReflectiveMethodInvocation.java:176)
     [java]     at org.springframework.transaction.interceptor.TransactionInterc
eptor.invoke(TransactionInterceptor.java:107)
     [java] MultiAccessTest stop…5
     [java]     at org.springframework.aop.framework.ReflectiveMethodInvocation.
proceed(ReflectiveMethodInvocation.java:176)
     [java]     at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(J
dkDynamicAopProxy.java:210)
     [java]     at $Proxy21.getCurrentUserName(Unknown Source)
     [java]     at org.alfresco.jcr.util.JCRProxyFactory$SessionConte xtInvocatio
nHandler.invoke(JCRProxyFactory.java:124)
     [java]     at $Proxy84.getRootNode(Unknown Source)
     [java]     at pl.swmind.jcr.test.UploadTest.execute(Unknown Source)
     [java]     at pl.swmind.jcr.test.SingleTest.start(Unknown Source)
     [java]     at pl.swmind.jcr.test.MultiAccessTest.run(Unknown Source)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Probably somewhere there is my stupid mistake but now i don't see it…
What is a problem here?

[rrino]

my stupid mistake of course - in class that extend thread i've tried to get session not in method run like i should but in constructor. I've not noticed it and been looking for mistake in other places:/

[mrogers]

Glad to hear you have fixed it.