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java.lang.NullPointerException: 	at org.dspace.storage.rdbms.DatabaseManager.queryTable(DatabaseManager.java:230)	at org.dspace.storage.rdbms.DatabaseManager.querySingleTable(DatabaseManager.java:381)	at org.dspace.storage.rdbms.DatabaseManager.findByUnique(DatabaseManager.java:546)	at org.dspace.handle.HandleManager.findHandleInternal(HandleManager.java:535)	at org.dspace.handle.HandleManager.resolveToObject(HandleManager.java:322)	at org.dspace.app.webui.servlet.HandleServlet.doDSGet(HandleServlet.java:128)	at org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:119)	at org.dspace.app.webui.servlet.DSpaceServlet.doGet(DSpaceServlet.java:67)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:277)	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:274)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAsPrivileged(Subject.java:536)	at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:309)	at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:169)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:297)	at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:191)	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:187)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:186)	at org.dspace.rdf.negotiation.NegotiationFilter.doFilter(NegotiationFilter.java:59)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:277)	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:274)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAsPrivileged(Subject.java:536)	at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:309)	at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:249)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)	at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:191)	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:187)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:186)	at org.dspace.utils.servlet.DSpaceWebappServletFilter.doFilter(DSpaceWebappServletFilter.java:78)	at sun.reflect.GeneratedMethodAccessor52.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:277)	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:274)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAsPrivileged(Subject.java:536)	at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:309)	at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:249)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)	at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:191)	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:187)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:186)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)