the Dspace 6 is running good and without any problem. but after  login all 
user expect admin got internal system error. this email got in admin mail- 
An internal server error occurred on http://192.168.1.158:8080/jspui:

Date:       8/2/21 1:37 PM
Session ID: B7748B699118F9761E5780DA74BE3F22
User:       Manish Bishnoi ([email protected])
IP address: 192.168.1.94

-- URL Was: http://192.168.1.158:8080/jspui/internal-error
-- Method: GET
-- Parameters were:


Exception:
org.apache.jasper.JasperException: javax.servlet.ServletException: 
org.dspace.plugin.PluginException: 
org.dspace.app.webui.components.RecentSubmissionsException: 
org.dspace.browse.BrowseException: 
org.dspace.discovery.SearchServiceException: Expected mime type 
application/octet-stream but got text/html. <!doctype html><html 
lang="en"><head><title>HTTP Status 400 – Bad Request</title><style 
type="text/css">h1 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
 
h2 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
 
h3 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
 
body 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} 
p 
{font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}
 
a {color:black;} a.name {color:black;} .line 
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP 
Status 400 – Bad Request</h1><hr class="line" /><p><b>Type</b> Exception 
Report</p><p><b>Message</b> Request header is too 
large</p><p><b>Description</b> The server cannot or will not process the 
request due to something that is perceived to be a client error (e.g., 
malformed request syntax, invalid request message framing, or deceptive 
request 
routing).</p><p><b>Exception</b></p><pre>java.lang.IllegalArgumentException: 
Request header is too large
        
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:720)
        
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:462)
        
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:684)
        
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        org.apache.tomcat.util.net
.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        org.apache.tomcat.util.net
.SocketProcessorBase.run(SocketProcessorBase.java:49)
        
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:748)
</pre><p><b>Note</b> The full stack trace of the root cause is available in 
the server logs.</p><hr class="line" /><h3>Apache Tomcat/8.5.39 
(Ubuntu)</h3></body></html>
        at 
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:598)
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:499)
        at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.dspace.utils.servlet.DSpaceWebappServletFilter.doFilter(DSpaceWebappServletFilter.java:78)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:660)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
        at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        at org.apache.tomcat.util.net
.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        at org.apache.tomcat.util.net
.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
Caused by: javax.servlet.ServletException: 
org.dspace.plugin.PluginException: 
org.dspace.app.webui.components.RecentSubmissionsException: 
org.dspace.browse.BrowseException: 
org.dspace.discovery.SearchServiceException: Expected mime type 
application/octet-stream but got text/html. <!doctype html><html 
lang="en"><head><title>HTTP Status 400 – Bad Request</title><style 
type="text/css">h1 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
 
h2 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
 
h3 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
 
body 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} 
p 
{font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}
 
a {color:black;} a.name {color:black;} .line 
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP 
Status 400 – Bad Request</h1><hr class="line" /><p><b>Type</b> Exception 
Report</p><p><b>Message</b> Request header is too 
large</p><p><b>Description</b> The server cannot or will not process the 
request due to something that is perceived to be a client error (e.g., 
malformed request syntax, invalid request message framing, or deceptive 
request 
routing).</p><p><b>Exception</b></p><pre>java.lang.IllegalArgumentException: 
Request header is too large
        
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:720)
        
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:462)
        
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:684)
        
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        org.apache.tomcat.util.net
.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        org.apache.tomcat.util.net
.SocketProcessorBase.run(SocketProcessorBase.java:49)
        
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:748)
</pre><p><b>Note</b> The full stack trace of the root cause is available in 
the server logs.</p><hr class="line" /><h3>Apache Tomcat/8.5.39 
(Ubuntu)</h3></body></html>
        at org.apache.jsp.index_jsp._jspService(index_jsp.java:187)
        at 
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
        ... 28 more
Caused by: org.dspace.plugin.PluginException: 
org.dspace.app.webui.components.RecentSubmissionsException: 
org.dspace.browse.BrowseException: 
org.dspace.discovery.SearchServiceException: Expected mime type 
application/octet-stream but got text/html. <!doctype html><html 
lang="en"><head><title>HTTP Status 400 – Bad Request</title><style 
type="text/css">h1 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
 
h2 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
 
h3 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
 
body 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} 
p 
{font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}
 
a {color:black;} a.name {color:black;} .line 
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP 
Status 400 – Bad Request</h1><hr class="line" /><p><b>Type</b> Exception 
Report</p><p><b>Message</b> Request header is too 
large</p><p><b>Description</b> The server cannot or will not process the 
request due to something that is perceived to be a client error (e.g., 
malformed request syntax, invalid request message framing, or deceptive 
request 
routing).</p><p><b>Exception</b></p><pre>java.lang.IllegalArgumentException: 
Request header is too large
        
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:720)
        
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:462)
        
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:684)
        
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        org.apache.tomcat.util.net
.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        org.apache.tomcat.util.net
.SocketProcessorBase.run(SocketProcessorBase.java:49)
        
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:748)
</pre><p><b>Note</b> The full stack trace of the root cause is available in 
the server logs.</p><hr class="line" /><h3>Apache Tomcat/8.5.39 
(Ubuntu)</h3></body></html>
        at 
org.dspace.app.webui.components.RecentSiteSubmissions.process(RecentSiteSubmissions.java:53)
        at org.apache.jsp.index_jsp._jspService(index_jsp.java:180)
        ... 31 more
Caused by: org.dspace.app.webui.components.RecentSubmissionsException: 
org.dspace.browse.BrowseException: 
org.dspace.discovery.SearchServiceException: Expected mime type 
application/octet-stream but got text/html. <!doctype html><html 
lang="en"><head><title>HTTP Status 400 – Bad Request</title><style 
type="text/css">h1 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
 
h2 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
 
h3 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
 
body 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} 
p 
{font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}
 
a {color:black;} a.name {color:black;} .line 
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP 
Status 400 – Bad Request</h1><hr class="line" /><p><b>Type</b> Exception 
Report</p><p><b>Message</b> Request header is too 
large</p><p><b>Description</b> The server cannot or will not process the 
request due to something that is perceived to be a client error (e.g., 
malformed request syntax, invalid request message framing, or deceptive 
request 
routing).</p><p><b>Exception</b></p><pre>java.lang.IllegalArgumentException: 
Request header is too large
        
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:720)
        
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:462)
        
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:684)
        
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        org.apache.tomcat.util.net
.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        org.apache.tomcat.util.net
.SocketProcessorBase.run(SocketProcessorBase.java:49)
        
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:748)
</pre><p><b>Note</b> The full stack trace of the root cause is available in 
the server logs.</p><hr class="line" /><h3>Apache Tomcat/8.5.39 
(Ubuntu)</h3></body></html>
        at 
org.dspace.app.webui.components.RecentSubmissionsManager.getRecentSubmissions(RecentSubmissionsManager.java:106)
        at 
org.dspace.app.webui.components.RecentSiteSubmissions.process(RecentSiteSubmissions.java:47)
        ... 32 more
Caused by: org.dspace.browse.BrowseException: 
org.dspace.discovery.SearchServiceException: Expected mime type 
application/octet-stream but got text/html. <!doctype html><html 
lang="en"><head><title>HTTP Status 400 – Bad Request</title><style 
type="text/css">h1 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
 
h2 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
 
h3 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
 
body 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} 
p 
{font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}
 
a {color:black;} a.name {color:black;} .line 
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP 
Status 400 – Bad Request</h1><hr class="line" /><p><b>Type</b> Exception 
Report</p><p><b>Message</b> Request header is too 
large</p><p><b>Description</b> The server cannot or will not process the 
request due to something that is perceived to be a client error (e.g., 
malformed request syntax, invalid request message framing, or deceptive 
request 
routing).</p><p><b>Exception</b></p><pre>java.lang.IllegalArgumentException: 
Request header is too large
        
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:720)
        
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:462)
        
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:684)
        
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        org.apache.tomcat.util.net
.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        org.apache.tomcat.util.net
.SocketProcessorBase.run(SocketProcessorBase.java:49)
        
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:748)
</pre><p><b>Note</b> The full stack trace of the root cause is available in 
the server logs.</p><hr class="line" /><h3>Apache Tomcat/8.5.39 
(Ubuntu)</h3></body></html>
        at 
org.dspace.browse.SolrBrowseDAO.getSolrResponse(SolrBrowseDAO.java:200)
        at org.dspace.browse.SolrBrowseDAO.doQuery(SolrBrowseDAO.java:309)
        at org.dspace.browse.BrowseEngine.browseMini(BrowseEngine.java:166)
        at 
org.dspace.app.webui.components.RecentSubmissionsManager.getRecentSubmissions(RecentSubmissionsManager.java:90)
        ... 33 more
Caused by: org.dspace.discovery.SearchServiceException: Expected mime type 
application/octet-stream but got text/html. <!doctype html><html 
lang="en"><head><title>HTTP Status 400 – Bad Request</title><style 
type="text/css">h1 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
 
h2 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
 
h3 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
 
body 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} 
p 
{font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}
 
a {color:black;} a.name {color:black;} .line 
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP 
Status 400 – Bad Request</h1><hr class="line" /><p><b>Type</b> Exception 
Report</p><p><b>Message</b> Request header is too 
large</p><p><b>Description</b> The server cannot or will not process the 
request due to something that is perceived to be a client error (e.g., 
malformed request syntax, invalid request message framing, or deceptive 
request 
routing).</p><p><b>Exception</b></p><pre>java.lang.IllegalArgumentException: 
Request header is too large
        
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:720)
        
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:462)
        
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:684)
        
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        org.apache.tomcat.util.net
.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        org.apache.tomcat.util.net
.SocketProcessorBase.run(SocketProcessorBase.java:49)
        
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:748)
</pre><p><b>Note</b> The full stack trace of the root cause is available in 
the server logs.</p><hr class="line" /><h3>Apache Tomcat/8.5.39 
(Ubuntu)</h3></body></html>
        at 
org.dspace.discovery.SolrServiceImpl.search(SolrServiceImpl.java:1615)
        at 
org.dspace.browse.SolrBrowseDAO.getSolrResponse(SolrBrowseDAO.java:195)
        ... 36 more
Caused by: 
org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: 
Expected mime type application/octet-stream but got text/html. <!doctype 
html><html lang="en"><head><title>HTTP Status 400 – Bad 
Request</title><style type="text/css">h1 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
 
h2 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
 
h3 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
 
body 
{font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b 
{font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} 
p 
{font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}
 
a {color:black;} a.name {color:black;} .line 
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP 
Status 400 – Bad Request</h1><hr class="line" /><p><b>Type</b> Exception 
Report</p><p><b>Message</b> Request header is too 
large</p><p><b>Description</b> The server cannot or will not process the 
request due to something that is perceived to be a client error (e.g., 
malformed request syntax, invalid request message framing, or deceptive 
request 
routing).</p><p><b>Exception</b></p><pre>java.lang.IllegalArgumentException: 
Request header is too large
        
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:720)
        
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:462)
        
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:684)
        
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
        org.apache.tomcat.util.net
.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        org.apache.tomcat.util.net
.SocketProcessorBase.run(SocketProcessorBase.java:49)
        
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        java.lang.Thread.run(Thread.java:748)
</pre><p><b>Note</b> The full stack trace of the root cause is available in 
the server logs.</p><hr class="line" /><h3>Apache Tomcat/8.5.39 
(Ubuntu)</h3></body></html>
        at 
org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:512)
        at 
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)
        at 
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)
        at 
org.apache.solr.client.solrj.request.QueryRequest.process(QueryRequest.java:91)
        at 
org.apache.solr.client.solrj.SolrServer.query(SolrServer.java:301)
        at 
org.dspace.discovery.SolrServiceImpl.search(SolrServiceImpl.java:1610)
        ... 37 more

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