How to search java class in maven dependencies

Dear All,
I tried to use Theia to search for classes that a Maven project depends on, but couldn’t find anything. and I already installed plugins like Extension Pack For Java. With some configurations in VS Code, I was able to search successfully, but these configurations didn’t work in Theia.
Here is the configurations:

Hey @dreamingyz,

what functionality of vscode were you using to search for the java classes? Just the normal file content search?

I use the Cmd+P shortcut search box to search for java classes