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https://issues.apache.org/jira/browse/FTPSERVER-441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marco Bianicni updated FTPSERVER-441:
-------------------------------------

    Description: 
I need to create an FTPServer with custom SslConfiguration and custom 
UserManager.
When i create MyUserManager i obtain the following runtime error:

java.lang.LinkageError: loader constraint violation: when resolving method 
"org.apache.ftpserver.FtpServerFactory.setUserManager(Lorg/apache/ftpserver/ftplet/UserManager;)V"
 the class loader (instance of 
org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) of the current class, 
com/sample/Activator, and the class loader (instance of 
org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) for resolved class, 
org/apache/ftpserver/FtpServerFactory, have different Class objects for the 
type 
rver.FtpServerFactory.setUserManager(Lorg/apache/ftpserver/ftplet/UserManager;)V
 used in the signature

This error is caused because FtpServer-core bundle has 
org.apache.ftpserver.ftplet package but this package is not exported by 
Manifest, and this mvn projects depends from ftplet-api bundle.
MyUserManager uses UserManager exported by ftplet-api.

There are 2 solutions for this:
- add import of org.apache.ftpserver.ftplet;version=1.0.6 and remove this 
package from bundle.
- export org.apache.ftpserver.ftplet and remove compile dependency from maven 
pom

  was:
I need to create an FTPServer with custom SslConfiguration and custom 
UserManager.
When i create MyUserManager i obtain the following runtime error:

java.lang.LinkageError: loader constraint violation: when resolving method 
"org.apache.ftpserver.FtpServerFactory.setUserManager(Lorg/apache/ftpserver/ftplet/UserManager;)V"
 the class loader (instance of 
org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) of the current class, 
com/sample/Activator, and the class loader (instance of 
org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) for resolved class, 
org/apache/ftpserver/FtpServerFactory, have different Class objects for the 
type 
rver.FtpServerFactory.setUserManager(Lorg/apache/ftpserver/ftplet/UserManager;)V
 used in the signature

This error is caused because FtpServer-core bundle has 
org.apache.ftpserver.ftplet package but these package is not exported by 
Manifest, and this mvn projects depends from ftplet-api bundle.
MyUserManager uses UserManager exported by ftplet-api.

There are 2 solutions for this:
- add import of org.apache.ftpserver.ftplet;version=1.0.6 and remove of this 
package from bundle.
- export org.apache.ftpserver.ftplet and remove compile dependency from maven 
pom

    
> Impossibile to create Custom UserManager in OSGI container
> ----------------------------------------------------------
>
>                 Key: FTPSERVER-441
>                 URL: https://issues.apache.org/jira/browse/FTPSERVER-441
>             Project: FtpServer
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.0.6
>         Environment: Karaf OSGI platform, with FtpServer-core bundle Ver 1.06 
> + My bundle that create new FtpServer
>            Reporter: Marco Bianicni
>              Labels: OSGI
>   Original Estimate: 12h
>  Remaining Estimate: 12h
>
> I need to create an FTPServer with custom SslConfiguration and custom 
> UserManager.
> When i create MyUserManager i obtain the following runtime error:
> java.lang.LinkageError: loader constraint violation: when resolving method 
> "org.apache.ftpserver.FtpServerFactory.setUserManager(Lorg/apache/ftpserver/ftplet/UserManager;)V"
>  the class loader (instance of 
> org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) of the current 
> class, com/sample/Activator, and the class loader (instance of 
> org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) for resolved class, 
> org/apache/ftpserver/FtpServerFactory, have different Class objects for the 
> type 
> rver.FtpServerFactory.setUserManager(Lorg/apache/ftpserver/ftplet/UserManager;)V
>  used in the signature
> This error is caused because FtpServer-core bundle has 
> org.apache.ftpserver.ftplet package but this package is not exported by 
> Manifest, and this mvn projects depends from ftplet-api bundle.
> MyUserManager uses UserManager exported by ftplet-api.
> There are 2 solutions for this:
> - add import of org.apache.ftpserver.ftplet;version=1.0.6 and remove this 
> package from bundle.
> - export org.apache.ftpserver.ftplet and remove compile dependency from maven 
> pom

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