In reality the "context" variable is accessible from Java as a regular java.util.Property object so you can get a greater control as to what to print or log but you have also "Advanced Settings" which you can use to state things like:
!(key_tContextLoad_1.contains("pass") || key_tContextLoad_1.contains("pwd"))Which as you guessed is trying to exclude anything containing password related paramter keys.
Here you can find a project that illustrates the two alternatives. Remember that Security must be a top priority in your app.