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RMI Connection to AEM 6.0 via JCR API

Forum|Forum|10 years ago
October 16, 2015
11 replies
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Hi,

AEM version: 6.0

Tried to make an rmi connection, from java application.

We followed the steps, as exactly as mentioned on the kb (https://helpx.adobe.com/experience-manager/kb/rmi-connection-crx-cq-561.html) and always we are getting the connection refused exception.

Apart from enabling RMI Connection listener, is we have to do anything at server level for enabling RMI?

In the code, we are referring to a parameter crx-application-name, where we have to configure the same?

Kindly advice us on this.

error.log (After enabling rmi listener):

*INFO* [CM Event Dispatcher (Fire ConfigurationEvent: pid=org.apache.sling.jcr.jackrabbit.server.RmiRegistrationSupport)] org.apache.sling.jcr.registration Using RMI Registry port 1199
*INFO* [JcrInstaller.1] org.apache.sling.installer.provider.jcr.impl.JcrInstaller Registering resource with OSGi installer: [InstallableResource, priority=200, id=/apps/system/config/org.apache.sling.jcr.jackrabbit.server.RmiRegistrationSupport.config]

Code Snippet:

public static void main (String[] args){

System.out.println("RMI to CRX Test Connection:");

ClientRepositoryFactory factory = new ClientRepositoryFactory();

Repository repository;

String crxApplicationName = "virtual-crx";

String repoUrl = "//localhost:1199/"+crxApplicationName;

String workspace = "crx.default";

String username = "admin";

char [] password = "admin".toCharArray();

try {

repository = factory.getRepository(repoUrl);

Session s = repository.login(new SimpleCredentials(username,password), workspace);

System.out.println("Workspace: " + s.getWorkspace().getName());

System.out.println("userId: "+s.getUserID());

} catch (Exception e) {

e.printStackTrace();

}

Exception:

RMI to CRX Test Connection:
Exception in thread "main" org.apache.jackrabbit.rmi.client.RemoteRuntimeException: java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
   java.net.ConnectException: Connection refused: connect
   at org.apache.jackrabbit.rmi.client.SafeClientRepository.getRemoteRepository(SafeClientRepository.java:85)
   at org.apache.jackrabbit.rmi.client.SafeClientRepository.<init>(SafeClientRepository.java:56)
   at org.apache.jackrabbit.rmi.client.ClientRepositoryFactory$1.<init>(ClientRepositoryFactory.java:90)
   at org.apache.jackrabbit.rmi.client.ClientRepositoryFactory.getRepository(ClientRepositoryFactory.java:90)
   at com.wbg.connectrepo.connectRepo.main(connectRepo.java:39)
Caused by: java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
   java.net.ConnectException: Connection refused: connect
   at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
   at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
   at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
   at sun.rmi.server.UnicastRef.newCall(Unknown Source)
   at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
   at java.rmi.Naming.lookup(Unknown Source)
   at org.apache.jackrabbit.rmi.client.ClientRepositoryFactory$1.getRemoteRepository(ClientRepositoryFactory.java:95)
   at org.apache.jackrabbit.rmi.client.SafeClientRepository.getRemoteRepository(SafeClientRepository.java:83)
   ... 4 more

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We also tried to make an rmi connection as mentioned on (http://dev.day.com/docs/en/crx/current/developing/accessing_the_crx.html#Accessing a Repository via RMI), in that case also we are getting the same exception

Code Snippet:

public static void main(String[] args) throws Exception{


       System.out.println("Test Rmi Connection.");

   Repository repository = JcrUtils.getRepository("rmi://localhost:1199/crx");

   SimpleCredentials creds = new SimpleCredentials("admin", "admin".toCharArray());
   Session session = null;


   session = repository.login(creds, "crx.default");
   }

Exception:

Exception in thread "main" javax.jcr.RepositoryException: Unable to access a repository with the following settings:
org.apache.jackrabbit.repository.uri: rmi://localhost:1199/crx
The following RepositoryFactory classes were consulted:
org.apache.jackrabbit.jcr2dav.Jcr2davRepositoryFactory: declined
org.apache.jackrabbit.jcr2spi.Jcr2spiRepositoryFactory: declined
org.apache.jackrabbit.commons.JndiRepositoryFactory: declined
org.apache.jackrabbit.rmi.repository.RmiRepositoryFactory: failed
because of RemoteRuntimeException: java.rmi.RemoteException: Failed to look up the RMI resource //localhost:1199/crx; nested exception is:
   java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
   java.net.ConnectException: Connection refused: connect
because of RemoteException: Failed to look up the RMI resource //localhost:1199/crx; nested exception is:
   java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
   java.net.ConnectException: Connection refused: connect
because of ConnectException: Connection refused to host: localhost; nested exception is:
   java.net.ConnectException: Connection refused: connect
because of ConnectException: Connection refused: connect
Perhaps the repository you are trying to access is not available at the moment.
   at org.apache.jackrabbit.commons.JcrUtils.getRepository(JcrUtils.java:223)
   at org.apache.jackrabbit.commons.JcrUtils.getRepository(JcrUtils.java:263)
   at com.wbg.connectrepo.connectRepo.main(connectRepo.java:21)

Thank,

Karthi

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Best answer by ogill

Thanks for the input Opkar!

Use Case: Connect crx remotely to execute query.

Is there any reason why it must be RMI? Could you not create a REST service for this request?

Regards,

Opkar

O

ogill

Adobe Employee

Try this AEM6 article: http://experience-aem.blogspot.de/2015/05/aem-6-sp2-accessing-crx-remotely-using-jcr-remoting-davex.html

Accessing with WebDAV seems possible, but not with RMI. I'd get in touch with Daycare to find out the status of RMI access.

smacdonald2008

Level 10

WHy not use JCR API from the Java client:

String aemUrl = "http://"+url +"/crx/server" ;
//Create a connection to the CQ repository running on local host
Repository repository = JcrUtils.getRepository(aemUrl);

//Create a Session
javax.jcr.Session session = repository.login( new SimpleCredentials("readonly", "readonly".toCharArray()));

This works perfectly from an external Java app.

Premkarthic-7WPAuthor

Level 4

Thanks for the info Opkar Gill.

That will get work well with getting enabled "WEBDAV" on aem environments.

Ideally we won't enable webdav on production environments. So, we chose to go with RMI connection.

Any directions, to fix that issue will be more helpful.

Thanks,

Karthi

Premkarthic-7WPAuthor

Level 4

Hi Scott,

Thanks for the inputs!

But the same won't work, if we disable the WEBDAV on aem environments rite?

So in that case, how we will connect from java app?

Kindly advice us on this pls.

Use Case : Access crx remotely to execute query.

Thanks,

Karthi

O

ogill

Adobe Employee

Hi Karthi,

it doesn't seem like it is currently possible. The last time I tried was with 5.6.1 and seem to remember issues with 6.x

What is it you are trying to do via RMI?

You could contact daycare to see the current status of RMI support.

Regards,

Opkar

Premkarthic-7WPAuthor

Level 4

Opkar Gill wrote...

Hi Karthi,

it doesn't seem like it is currently possible. The last time I tried was with 5.6.1 and seem to remember issues with 6.x

What is it you are trying to do via RMI?

You could contact daycare to see the current status of RMI support.

Regards,

Opkar

Thanks for the input Opkar!

Use Case: Connect crx remotely to execute query.

O

ogill

Accepted solution

Adobe Employee

Thanks for the input Opkar!

Use Case: Connect crx remotely to execute query.

Is there any reason why it must be RMI? Could you not create a REST service for this request?

Regards,

Opkar

smacdonald2008

Level 10

See this community article - its a Java Swing app that connects to AEM and pull in JCR Data:

[img]AAppSwing.png[/img]

https://helpx.adobe.com/experience-manager/using/java-swing-applications.html

Premkarthic-7WPAuthor

Level 4

I went through the article that you shared, in that also they are using same webdav approach Scott.

We disabled webdav on our environments for security reasons.

Is there any other way, to do the same. Please advice us.

In the getRepository method, a Session is created by using the JCR API.

//Retrieve member data from the JCR
public List<members> getRepository(String url)
{

try {

String aemUrl = "http://"+url +"/crx/server" ;

//Create a connection to the CQ repository running on local host
Repository repository = JcrUtils.getRepository(aemUrl);

//Create a Session
javax.jcr.Session session = repository.login( new SimpleCredentials("readonly", "readonly".toCharArray()));

Thanks,

Karthi

Premkarthic-7WPAuthor

Level 4

Hi Scott,

I tried something like below one to register rmi from my java app,

Is there any other way to get the crx repository instead of using jcrUtils (look on stroked line on the below code), because in that it requires to get the webdav enabled.

public static void main(String[] args) throws Exception{


   System.out.println("Test Rmi Connection.");
   Registry reg = LocateRegistry.createRegistry(2020);

   ~~Repository repository = JcrUtils.getRepository("http://locahost:1010/crx/server");~~

   ServerAdapterFactory serverFactory = new ServerAdapterFactory();
   RemoteRepository remote = serverFactory.getRemoteRepository(repository2);
   reg.rebind("crx", remote);

After hosting this we are able to make rmi connection as below one

Repository repos = JcrUtils.getRepository("rmi://localhost:1010/crx");

}

Thanks,

Karthi

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getRepository method

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