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Is the javascript with the react app even loaded? Did you check in the browser developer tools? Do you see any errors in the browser console?

What is your project setup? How did you create it? Did you use the generator?

https://github.com/liferay/liferay-js-toolkit/wiki/How-to-use-generator-liferay-js

Or did you use liferay-js:adapt to package your widget?

https://help.liferay.com/hc/en-us/articles/360035467712-Adapting-Existing-Apps-to-Run-on-Liferay-DXP

Hi Christoph Rabel for you answer.

I used liferay-js:adapt for my project

I don't see any error in the browser console

Is the javascript with the react app even loaded? -> How can I verify that?

You could try to check in the network tab. Search for "my-app" (or whatever your module is called). You should see some requests like these:

http://localhost:8080/o/js_resolve_modules?modules=my-app@0.1.0

http://localhost:8080/combo/?.../o/js/resolved-module/my-app@0.1.0/static/js/runtime-main.js&/o/js/resolved-module/my-app@0.1.0/static/js/2.chunk.js&/o/js/resolved-module/my-app@0.1.0/static/js/main.chunk.js&/o/js/resolved-module/my-app@0.1.0/adapt-rt.js&/o/js/resolved-module/my-app@0.1.0/index.js

In general, it is really hard to tell why it does not work for you. It works for me.

Did you change anything on the page or try start from scratch? Create react app, adapt, deploy? Which Liferay version do you use?