Forgetting syntax shouldn't be a problem. That's what manuals are for. Of course, if you are applying for a Java programmer job and you don't know the first thing about how Java program looks like, it's a no-no. But if you forgot some detail about how to write some obscure construct - that's what manuals and SO are for.

6 months to get into things is kinda long though. Unless it's super complex things, it should be less. Are you sure you are not exaggerating?