Cannot load classes for custom user store

I implemented a custom user store and deployed as sda library into NetWeaver preview SP16. NetWeaver is not able to load those classes when configuring that user store through Visual Administrator. Below is the error message I got,
Unable to register user store!
java.lang.SecurityException: com.sap.engine.services.security.exceptions.BaseSecurityException: Can not instantiate UserContext.
     at com.sap.engine.services.security.server.UserStoreImpl.<init>(UserStoreImpl.java:78)
     at com.sap.engine.services.security.server.UserStoreFactoryCache.registerUserStore(UserStoreFactoryCache.java:120)
     at com.sap.engine.services.security.server.UserStoreFactoryImpl.registerUserStore(UserStoreFactoryImpl.java:150)
     at com.sap.engine.services.security.userstore.RemoteUserStoreFactoryImpl.registerUserStore(RemoteUserStoreFactoryImpl.java:64)
     at com.sap.engine.services.security.userstore.RemoteUserStoreFactoryImplp4_Skel.dispatch(RemoteUserStoreFactoryImplp4_Skel.java:99)
     at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:304)
     at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:193)
     at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:122)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
     at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
Caused by: java.lang.ClassNotFoundException: mypackage.myusercontextimpl
Found in negative cache
Loader Info -
ClassLoader name: [common:library:com.sap.security.api.sda;library:com.sap.security.core.sda;library:security.class;library:webservices_lib;service:adminadapter;service:basicadmin;service:com.sap.security.core.ume.service;service:configuration;service:connector;service:dbpool;service:deploy;service:jmx;service:jmx_notification;service:keystore;service:security;service:userstore]
Parent loader name: [Frame ClassLoader]
References:
   library:com.sap.ip.basecomps
   library:core_lib
   common:library:IAIKSecurity;library:activation;library:mail;library:tcsecssl
   library:servlet
   library:sapxmltoolkit
   library:com.sap.mw.jco
   library:com.sap.util.monitor.jarm
   library:j2eeca
   library:opensql
   interface:security
   interface:log
   interface:shell
   interface:keystore_api
   library:ejb20
   interface:webservices
   library:com.sap.guid
   interface:appcontext
   interface:endpoint_api
   interface:resourceset_api
   interface:resourcecontext_api
   common:service:iiop;service:naming;service:p4;service:ts
   interface:ejbcomponent
   interface:container
   interface:visual_administration
   interface:transactionext
   interface:dsr_ejbcontext_api
   service:timeout
   library:tc~jmx
   interface:cross
   service:file
   service:locking
   library:tcSLUTIL
   service:memory
   library:antlr
   library:jdbdictionary
   library:opensqlextensions
Resources:
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\dbpool\dbpool.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\basicadmin\basicadmin.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_compat.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\adminadapter\adminadapter.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\basicadmin\jstartupimpl.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\jmx_notification\jmx_notification.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\security\security.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\com.sap.security.core.ume.service\com.sap.security.core.ume.service.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_saml_toolkit_api.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_userstore_lib.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\webservices_lib\webservices_lib.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\basicadmin\jstartupapi.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_jaas_test.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\dbpool\sqljimpl.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\com.sap.security.core.sda\com.sap.security.core.tpd.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\com.sap.security.api.sda\com.sap.security.api.perm.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\connector\connectorimpl.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\webservices_lib\saaj-api.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\configuration\configuration.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_saml_jaas.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_saml_xmlbind.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_saml_util.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_csi.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_saml_toolkit_core.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_ssf.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\userstore\userstore.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_https.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_saml_service_api.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\webservices_lib\jaxrpc-api.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\dbpool\opensqllib.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\deploy\deploy.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\security.class\tc_sec_jaas.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\jmx\jmx_sec.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\com.sap.security.api.sda\com.sap.security.api.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\com.sap.security.core.sda\com.sap.security.core.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\jmx\jmx.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\ext\webservices_lib\jaxm-api.jar
   C:\usr\sap\J2E\JC00\j2ee\cluster\server0\bin\services\keystore\keystore.jar
Loading model: {parent,local,references}
     at com.sap.engine.frame.core.load.ReferencedLoader.loadClass(ReferencedLoader.java:348)
     at com.sap.engine.services.security.server.UserStoreImpl.<init>(UserStoreImpl.java:75)
     ... 13 more
     at com.sap.engine.services.security.exceptions.BaseSecurityException.writeReplace(BaseSecurityException.java:349)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:896)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1011)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
     at com.sap.engine.services.rmi_p4.DispatchImpl.throwException(DispatchImpl.java:139)
     at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:306)
     at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:193)
     at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:122)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
     at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)

Hi sheshu0022,
Based on my research, the issue can be occurred due to something get corrupted in the script task. To fix this issue, please copy the code in the task, then rebuild the script task with the same code to test again.
The following similar thread is for your reference:
http://stackoverflow.com/questions/15165760/ssis-script-task-fails-on-server-with-error-cannot-load-script-for-execution
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

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