Hello, We have migrated from version 1.6 to version 4.2 DSpace, DSpace runs 
oracle, the jspui context and solr working properly. But when starting the OAI 
context, it displays the following error when accessing the URL:
http://direccion.com/oai/request
org.apache.solr.client.solrj.impl.HttpClientUtil createClientINFO: Creating new 
http client, 
config:maxConnections=128&maxConnectionsPerHost=32&followRedirects=false[OAI 
2.0] Initializedjava.lang.NullPointerException        at 
java.io.File.<init>(File.java:277)        at 
org.dspace.xoai.util.FileServlet.doGet(FileServlet.java:48)        at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:620)        at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)        
at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)   
     at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)    
    at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)       
 at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)     
   at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
        at 
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
       at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
       at java.lang.Thread.run(Thread.java:745)
please aid, any suggestion is appreciated.
regards                                           
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