See other postings about this, related to SmartGWT LGPL for example. Nobody here is a lawyer, so you can only take our info for what little it's worth. Note that SmartGWT and some others have "extra clauses" added to the LGPL that will allow you to do so because they allow the fact that with GWT, the LGPL code is actually merged into your code base so it cannot be replaced/installed independently of your compiled code. In effect, they are acknowledging the reality that your code is only using the library's API (presuming you are not changing the API code, which would still require you release that code) and so falls under that interpretation. But without the added clause, it could be tricky as your code does get mixed in and the user can't just patch the GWT library code without having your source to recompile/bind/link it together.
Server-side LGPL code generally doesn't have this issue. And no open source license protects you should it be found that the library itself is not fully owned by the project owners -- that is, they may violate patents or have stolen code from elsewhere without your knowledge. Some of this can be ameliorated by using well established projects where the code is more likely to have been vetted, or even those from companies that also offer commercial licenses for the same software if those licenses provide such protections because companies are less likely to offer such terms for money when it's not true -- but in the end, it's always buyer beware, whether open or closed.--
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