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    <p>you can see all requests send to your server in access log. just comment out AccessLogValve in $TOMCAT_HOME/conf/server.xml.</p> <pre class="lang-xml prettyprint-override"><code>&lt;Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/&gt; </code></pre> <p>There is no way to logging 4xx request, but hack source code as following description. </p> <p>remove test code condition in <strong>org.apache.solr.servlet.SolrDispatchFilter.java</strong> *<em>sendError</em>* method.</p> <pre class="lang-java prettyprint-override"><code>protected void sendError(HttpServletResponse res, Throwable ex) throws IOException { int code=500; String trace = ""; if( ex instanceof SolrException ) { code = ((SolrException)ex).code(); } // For any regular code, don't include the stack trace if( code == 500 || code &lt; 100 ) { StringWriter sw = new StringWriter(); ex.printStackTrace(new PrintWriter(sw)); trace = "\n\n"+sw.toString(); SolrException.logOnce(log,null,ex ); // non standard codes have undefined results with various servers if( code &lt; 100 ) { log.warn( "invalid return code: "+code ); code = 500; } } res.sendError( code, ex.getMessage() + trace ); } </code></pre> <p>after compile, you need put your new apache-solr-core-*.jar to WEB-INF/lib, and restart your web container. you will see all of errors like below.</p> <blockquote> <p>Sep 22, 2011 5:29:18 PM org.apache.solr.common.SolrException log SEVERE: org.apache.solr.common.SolrException: unknown handler: notexist at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:662)</p> </blockquote>
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    1. POSOLR : Logging Bad Requests
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    1. COThis will log all the requests, and I did not need to configure anything, this piece of configuration was already there off the shelf. I need to make SOLR log Bad requests made on it. (As a temporary solution I made the application log the solr bad requests.)
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    2. COThis is good & works for me! I was keeping the hack & recompile source code as the last option (for sake of smooth updating of solr later). But this helped me to do just that, although I had to change a little more than what you mentioned here.
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