hi,

I have a lot of memory allocated for dspace 32,64,128 Gb - it doesn't 
matter,  swap is in use anyway. I found such errors in tomcat:

The web application [server] created a ThreadLocal with key of type 
[java.lang.ThreadLocal.SuppliedThreadLocal] (value 
[java.lang.ThreadLocal$SuppliedThreadLocal@4e12dfd8]) and a value of type 
[org.springframework.util.ConcurrentLruCache] (value 
[org.springframework.util.ConcurrentLruCache@4cf0f8fd]) 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

And swap is used by the process:
/usr/lib/jvm/default-java/bin/java 
-Djava.util.logging.config.file=/var/lib/tomcat9/conf/logging.properties 
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
 
Greetings,

Karol

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