On 04/01/2023 15:11, Daniel McCue wrote:
Apache Tomcat/9.0.58 reports an error on shutdown: "Failed to clear soft
references from ObjectStreamClass$Caches for web application [ROOT]"
The error is reported for web applications: [ROOT], [host-manager], and
[manager] -- the only applications deployed in Tomcat.
The traceback shows a ClassCastException in
org.apache.catalina.loader.WebappClassLoaderBase.clearCache
I have searched the FAQ, configuration documentation, and web (google
search), but found only framework-specific solutions like "delete the
directory, CATALINA_BASE/conf/Catalina/localhost/awi", which doesn't exist
in my configuration.
There is a reference to ClassCastExceptions in the release notes for Tomcat
9.0.70, but it suggests moving app-specific .jar files to the shared
loader. I have loaded none of my own apps -- only the ones that come with
tomcat and tomcat-admin. I cannot find any app-specific .jar files in
Catalina.properties or anywhere in CATALINA_BASE or its subdirectories.
I have updated all software on my Ubuntu machine as of today (4-jan-2022)
using "sudo apt-get update; sudo apt-get upgrade".
I have rebooted the machine and ensured that no files existed in
CATALINA_BASE/lib, but the problem persists.
How can I find my configuration error or stale cache data or somehow clean
up the shutdown process?
There is no configuration error.
There is no stale cache data.
The warning results from using a JRE that includes a fix for [1]
https://bugs.openjdk.org/browse/JDK-8277072
Newer versions of Tomcat that have [2] (9.0.64 onwards) check for the
fix and don't attempt to clear the cache if the fix is present.
You can just ignore the warning.
If you want to silence the warning you can set the context attribute
clearReferencesObjectStreamClassCaches="false"
Mark
[1] https://bugs.openjdk.org/browse/JDK-8277072
[2]
https://github.com/apache/tomcat/commit/385d4095ccf354c2f9c527283f3ed2832de1a1cf
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
For additional commands, e-mail: users-h...@tomcat.apache.org
