From willem.s...@gmail.com on May 19, 2012 09:57:13

Version of google-http-java-client: 1.9.0-beta
Java environment: Java 6

There is a dangerous initialization problem in the class
com.google.api.client.http.UriTemplate. The COMPOSITE_PREFIXES map is not filled after classloading but only when the enum CompositeOutput is used. This means the first time getCompositeOutput is called, the map is still empty and only on line 190 the map is filled.

Testcase:

Map<String, Object> map = new HashMap<String, Object>();
map.put("id", Arrays.asList("a", "b", "c").iterator());

System.out.println("first:" + UriTemplate.expand("{/id_}", map, false));
System.out.println("second:" + UriTemplate.expand("{/id_}", map, false));

Output:
first:
second:/a/b/c How would you expect it to be fixed? Initialize map in a static {} block
The result of calling UriTemplate.expand twice should be the same

Original issue: http://code.google.com/p/google-http-java-client/issues/detail?id=117