# WARNING: sun.reflect.Reflection.getCallerClass is not supported **URL:** \ **Category:** Graylog Central (peer support)\ **Created:** [January 10, 2022, 11:51pm UTC](https://community.graylog.org/t/warning-sun-reflect-reflection-getcallerclass-is-not-supported/22289 "2022-01-10T23:51:41Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![libertasfox](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/libertasfox/32/4310_2.png) [@libertasfox](https://community.graylog.org/u/libertasfox)\ **Post date:** [January 10, 2022, 11:51pm UTC](https://community.graylog.org/t/warning-sun-reflect-reflection-getcallerclass-is-not-supported/22289/1 "2022-01-10T23:51:41Z")
Before you post: Your responses to these questions will help the community help you. Please complete this template if you’re asking a support question. **Don’t forget to select tags to help index your topic!** **1. Describe your incident:** Just installed Graylog 4.2.5 and upon checking the status of the Graylog service, I received the error message below. The server is up and running and I’m able to access it without issue. ● graylog-server.service - Graylog server Loaded: loaded (/lib/systemd/system/graylog-server.service; enabled; vendor preset: enabled) Active: active (running) since Mon 2022-01-10 23:16:19 UTC; 8s ago Docs: [http://docs.graylog.org/](http://docs.graylog.org/) Main PID: 2311489 (graylog-server) Tasks: 103 (limit: 19110) Memory: 809.7M CGroup: /system.slice/graylog-server.service ├─2311489 /bin/sh /usr/share/graylog-server/bin/graylog-server └─2311533 /usr/bin/java -Xms1g -Xmx1g -XX:NewRatio=1 -server -XX:+ResizeTLAB -XX:-OmitStackTraceInFastThrow -Djdk.tls.acknowledgeCloseNotify=true → Jan 10 23:16:19 servername systemd[1]: Started Graylog server. Jan 10 23:16:19 servername graylog-server[2311533]: WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance. **2. Describe your environment:** - OS Information: Ubuntu 20.04.3 LTS - Package Version: 4.2.5 - Service logs, configurations, and environment variables: servername:~$ java -version openjdk version “17.0.1” 2021-10-19 OpenJDK Runtime Environment (build 17.0.1+12-Ubuntu-120.04) OpenJDK 64-Bit Server VM (build 17.0.1+12-Ubuntu-120.04, mixed mode, sharing) **3. What steps have you already taken to try and solve the problem?** Looked in the Community and scoured the web for anyone else that may have the same issue. **4. How can the community help?** What concerns me most is the following line: “This will impact performance.” Has anyone seen this recently and if so, is there a resolution for it? **Helpful Posting Tips:** [Tips for Posting Questions that Get Answers](https://community.graylog.org/t/tips-for-posting-questions-that-get-answers/21828) [Hold down CTRL and link on link to open tips documents in a separate tab] ---
**Author:** ![gsmith](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/gsmith/32/1222_2.png) [@gsmith](https://community.graylog.org/u/gsmith)\ **Post date:** [January 11, 2022, 12:47am UTC](https://community.graylog.org/t/warning-sun-reflect-reflection-getcallerclass-is-not-supported/22289/2 "2022-01-11T00:47:19Z")
Hello, I have seen that issue here > > > When using OpenJDK 11 on CentOS 7, I see warnings about illegal reflective acces…s operations that show up after startup. > > Output from systemctl -l status graylog-server: > \`\`\` > ● graylog-server.service - Graylog server > Loaded: loaded (/usr/lib/systemd/system/graylog-server.service; enabled; vendor preset: disabled) > Active: active (running) since Wed 2020-01-15 00:35:06 CST; 3 days ago > Docs: http://docs.graylog.org/ > Main PID: 17354 (graylog-server) > CGroup: /system.slice/graylog-server.service > ├─17354 /bin/sh /usr/share/graylog-server/bin/graylog-server > └─17356 /usr/bin/java -Xms2g -Xmx2g -XX:NewRatio=1 -server -XX:+ResizeTLAB -XX:+CMSConcurrentMTEnabled -XX:+CMSClassUnloadingEnabled -XX:-OmitStackTraceInFastThrow -jar -Dlog4j.configurationFile=file:///etc/graylog/server/log4j2.xml -Djava.library.path=/usr/share/graylog-server/lib/sigar -Dgraylog2.installation\_source=rpm /usr/share/graylog-server/graylog.jar server -f /etc/graylog/server/server.conf -np > > Jan 15 00:35:06 graylog systemd\[1\]: Started Graylog server. > Jan 15 00:35:07 graylog graylog-server\[17354\]: WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance. > Jan 15 00:35:12 graylog graylog-server\[17354\]: WARNING: An illegal reflective access operation has occurred > Jan 15 00:35:12 graylog graylog-server\[17354\]: WARNING: Illegal reflective access by com.google.inject.assistedinject.FactoryProvider2$MethodHandleWrapper (file:/usr/share/graylog-server/graylog.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int) > Jan 15 00:35:12 graylog graylog-server\[17354\]: WARNING: Please consider reporting this to the maintainers of com.google.inject.assistedinject.FactoryProvider2$MethodHandleWrapper > Jan 15 00:35:12 graylog graylog-server\[17354\]: WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations > Jan 15 00:35:12 graylog graylog-server\[17354\]: WARNING: All illegal access operations will be denied in a future release > \`\`\` > > \## Context > I have not done any testing on this and the service seems to startup and run. > > \## Your Environment > Graylog server 3.1.4+1149fe1 > JRE: Oracle Corporation 11.0.5 on Linux 3.10.0-1062.9.1.el7.x86\_64 > Deployment: rpm > OS: CentOS Linux 7 (Core) (centos) > Arch: amd64 > [@Graylog starts but browser shows apache default page](https://community.graylog.org/t/graylog-starts-but-browser-shows-apache-default-page/15239): > > systemctl status graylog-server.service shows a warning: graylog-server.service - Graylog server Loaded: loaded (/lib/systemd/system/graylog-server.service; enabled; vendor preset: enabled) Active: active (running) since Sun 2020-05-03 17:47:38 CEST; 4min 18s ago Docs: [http://docs.graylog.org/](http://docs.graylog.org/) Main PID: 8790 (graylog-server) Tasks: 105 (limit: 4662) Memory: 774.3M CGroup: /system.slice/graylog-server.service ├─8790 /bin/sh /usr/share/graylog-server/bin/graylog-server └─8809 /usr/bin/ja… > > > \## Expected Behavior > Unsupported classes should not be used. > > \## Current Beha…vior > Running Graylog 4.2 with Java 11 generates following Warning > > \`\`\` > WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance. > WARNING: An illegal reflective access operation has occurred > WARNING: Illegal reflective access by retrofit2.Platform (file:/usr/share/graylog-server/graylog.jar) to constr\> > WARNING: Please consider reporting this to the maintainers of retrofit2.Platform > WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations > WARNING: All illegal access operations will be denied in a future release > \`\`\` > > \## Possible Solution > > \## Steps to Reproduce (for bugs) > 1. Upgrade Graylog to 4.2 with Java 11 > 2. Start service > 3. Check service status > > \## Context > > > > \## Your Environment > > \* Graylog Version: 4.2 > \* Java Version: openjdk version "11.0.13" 2021-10-19 LTS > \* Operating System: CentOS Linux release 8.4.2105 [https://coderedirect.com/questions/347020/is-log4j2-compatible-with-java-11](https://coderedirect.com/questions/347020/is-log4j2-compatible-with-java-11) Hope that helps ---
**Author:** ![libertasfox](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/libertasfox/32/4310_2.png) [@libertasfox](https://community.graylog.org/u/libertasfox)\ **Post date:** [January 11, 2022, 3:11pm UTC](https://community.graylog.org/t/warning-sun-reflect-reflection-getcallerclass-is-not-supported/22289/3 "2022-01-11T15:11:57Z")
Thanks, gsmith. I appreciate the help. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/3X/c/7/c7c09c6b5099570133d6502b83f50ba4430de5b6.png) [@system](https://community.graylog.org/u/system)\ **Post date:** [January 25, 2022, 3:12pm UTC](https://community.graylog.org/t/warning-sun-reflect-reflection-getcallerclass-is-not-supported/22289/4 "2022-01-25T15:12:31Z")
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