Depends on how you interpret 'everything' and 'each time'.

The default compiler plugin configuration is quite eager to recompile allot if something changed.

https://maven.apache.org/plugins/maven-compiler-plugin/compi...

"true (default) in this mode the compiler plugin determines whether [...] any source file was added, removed or changed since the last compilation. If this is the case, the compiler plugin recompiles _all_ sources.