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-A few minutes ago I found myself debugging a strange Java issue related
-to Jackson, one of the most common Java JSON serialization libraries.
-
-The gist of the issue was that a short wrapper using some types from
-[Javaslang](http://www.javaslang.io/) was causing unexpected problems:
-
-```java
-public <T> Try<T> readValue(String json, TypeReference type) {
-  return Try.of(() -> objectMapper.readValue(json, type));
-}
-```
-
-The signature of this function was based on the original Jackson
-`readValue` type signature:
-
-```java
-public <T> T readValue(String content, TypeReference valueTypeRef)
-```
-
-While happily using my wrapper function I suddenly got an unexpected
-error telling me that `Object` is incompatible with the type I was
-asking Jackson to de-serialize, which got me to re-evaluate the above
-type signature again.
-
-Lets look for a second at some code that will *happily compile* if you
-are using Jackson\'s own `readValue`:
-
-```java
-// This shouldn't compile!
-Long l = objectMapper.readValue("\"foo\"", new TypeReference<String>(){});
-```
-
-As you can see there we ask Jackson to decode the JSON into a `String`
-as enclosed in the `TypeReference`, but assign the result to a `Long`.
-And it compiles. And it failes at runtime with
-`java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Long`.
-Huh?
-
-Looking at the Jackson `readValue` implementation it becomes clear
-what\'s going on here:
-
-```java
-@SuppressWarnings({ "unchecked", "rawtypes" })
-public <T> T readValue(String content, TypeReference valueTypeRef)
-    throws IOException, JsonParseException, JsonMappingException
-{
-    return (T) _readMapAndClose(/* whatever */);
-}
-```
-
-The function is parameterised over the type `T`, however the only place
-where `T` occurs in the signature is in the parameter declaration and
-the function return type. Java will happily let you use generic
-functions and types without specifying type parameters:
-
-```java
-// Compiles fine!
-final List myList = List.of(1,2,3);
-
-// Type is now myList : List<Object>
-```
-
-Meaning that those parameters default to `Object`. Now in the code above
-Jackson also explicitly casts the return value of its inner function
-call to `T`.
-
-What ends up happening is that Java infers the expected return type from
-the context of the `readValue` and then happily uses the unchecked cast
-to fit that return type. If the type hints of the context aren\'t strong
-enough we simply get `Object` back.
-
-So what\'s the fix for this? It\'s quite simple:
-
-```java
-public <T> T readValue(String content, TypeReference<T> valueTypeRef)
-```
-
-By also making the parameter appear in the `TypeReference` we \"bind\"
-`T` to the type enclosed in the type reference. The cast can then also
-safely be removed.
-
-The cherries on top of this are:
-
-1.  `@SuppressWarnings({ "rawtypes" })` explicitly disables a
-    warning that would\'ve caught this
-
-2.  the `readValue` implementation using the less powerful `Class`
-    class to carry the type parameter does this correctly: `public <T>
-    T readValue(String content, Class<T> valueType)`
-
-The big question I have about this is *why* does Jackson do it this way?
-Obviously the warning did not just appear there by chance, so somebody
-must have thought about this?
-
-If anyone knows what the reason is, I\'d be happy to hear from you.
-
-PS: Shoutout to David & Lucia for helping me not lose my sanity over
-this.