Protostuff循环引用中的RuntimeSchema？

Question

We're using Protostuff's RuntimeSchema to serialize our data. This mostly works but we sometimes get:

java.lang.StackOverflowError
at io.protostuff.runtime.ObjectSchema.mergeFrom(ObjectSchema.java:350) ~[protostuff-runtime-1.5.3.jar:1.5.3]
at io.protostuff.CodedInput.mergeObjectEncodedAsGroup(CodedInput.java:336) ~[protostuff-core-1.5.3.jar:1.5.3]
at io.protostuff.CodedInput.mergeObject(CodedInput.java:298) ~[protostuff-core-1.5.3.jar:1.5.3]
at io.protostuff.runtime.RuntimeUnsafeFieldFactory$15$1.mergeFrom(RuntimeUnsafeFieldFactory.java:1217) ~[protostuff-runtime-1.5.3.jar:1.5.3]

This obviously means we've some sort of cyclic reference inside our objects.
Reading the documentation Protostuff theoretically do support cyclic references in runtime schemas, is there a configuration I need to enable for this to work?

I read about: Dprotostuff.runtime.collection_schema_on_repeated_fields but it's suppose to apply only to cyclic reference of array items which is not the case in our objects.

Thanks!

Answer 1

Protostuff supports multiple encoding formats ( protobuf , json and its own graph ).

If your objects contain cyclic references, then only one is suitable - graph . You can use it with io.protostuff.GraphIOUtil .

Please note that other encodings ( json , protobuf ) cannot support cyclic references (it requires additional information to be included into serialized form, which is not really possible there).

Some additional information on this topic can be found here: http://www.protostuff.io/documentation/object-graphs/