receiving error 504 many times causing the site to go down

[Lewatle Johannes Phaladi]

Hi DSpace Tech,

I am receiving error 504 many times and that cause the site to go down, temporary solution I am using is to restart tomcat, please see tomcat tog file below. this happen when we open access for other countries abroad and we are suspecting bots, please help

19-Jan-2026 08:16:50.705 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [org.springframework.boot.SpringBootExceptionHandler.LoggedExceptionHandlerThreadLocal] (value [org.springframework.boot.SpringBootExceptionHandler$LoggedExceptionHandlerThreadLocal@7b667bb5]) and a value of type [org.springframework.boot.SpringBootExceptionHandler] (value [org.springframework.boot.SpringBootExceptionHandler@5c7478]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.706 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4306f4cc]) and a value of type [net.sf.saxon.expr.sort.LRUCache] (value [net.sf.saxon.expr.sort.LRUCache@3215e451]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.706 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@3601b5f5]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.706 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@5335343c]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.706 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@54c352fe]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.706 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@42823c53]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.706 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@799787eb]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.707 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@1e50f349]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.707 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@5bbd97b7]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.707 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@1648e4a1]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.707 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@428f4bc4]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.707 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@5b5c2267]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.707 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@6c6b1694]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.707 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@3d578a54]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.708 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@53e2751]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.708 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@3f4b728b]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.708 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@b201c40]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.708 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@a24225a]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.708 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@7ed498e0]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
19-Jan-2026 08:16:50.708 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [server] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4e4b1396]) and a value of type [org.apache.xerces.jaxp.DocumentBuilderImpl] (value [org.apache.xerces.jaxp.DocumentBuilderImpl@1a6f629b]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

 Regards,

Lewatle