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Here is the home page for the JetBrains annotations Maven project: https://github.com/JetBrains/java-annotations

Example

Here's an example. I annotated the clientVersion parameter to writeHandshakeMessage this way:

  public void writeHandshakeMessage(DataOutputStream dos, byte type, String p_msg,
      @NotNull final KnownVersion clientVersion, byte endpointType, int queueSize)
      throws IOException {

Here is the IDE highlighting a situation where an (indirect) caller may be passing null:

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Under "More actions" I pick "Navigate to 'null' argument usages":

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…where I find this call-site passing a null for clientVersion:

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I could've found this without IDE support. But in this case, I didn't find it until I leveraged the IDE support.