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From my java code I'm returning a Set<String> . The view needs to check if the Set contains a specific string.. I can't find any docs on how Freemarker can handle this.
Any idea?

You can use seq_contains . You need FreeMarker 2.3.1

${x?seq_contains("blue")?string("yes", "no")}
This will output yes if the sequence contains "blue". 
And from the comments, if you want this in an if statement
<#if x?seq_contains("myString")>
Here is the doco about it Built-ins for sequences
                I think the answer could be corrected to have <#if mySet?seq_contains("myString")> because there was not specified that printing a string is required  Also just <#if x.contains("myString")> should work
– skrii
                Jul 11, 2016 at 14:20
                I've added the if example. The point of the first example is to make it clear what seq_contains does, I wasn't trying to show all the various statements in which you can use it.
– Iain
                Aug 14, 2016 at 0:24
        
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