Akka-对象序列化期间的StackOverflowError

Question

I'm with a problem that extends for more than 2 days. When I'm exchanging messages between actors, is accusing the JVM stack overflow.

My message is an object with many links (10000+ child objects linked together in a linked list). Namely, an object with Neo4J relationships.

The error is this:

java.lang.StackOverflowError
    at java.io.Bits.putLong(Bits.java:108)
    at java.io.ObjectOutputStream$BlockDataOutputStream.writeLong(ObjectOutputStream.java:1928)
    at java.io.ObjectOutputStream.writeLong(ObjectOutputStream.java:788)
    at java.util.Date.writeObject(Date.java:1303)
    at sun.reflect.GeneratedMethodAccessor41.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)

Does anyone have any solution for this?

thanks

Answer 1

Are you using java.util.LinkedList , or a custom linked list of your own? If the latter, you need to write a custom writeObject() method for it that avoids the recursion that would happen if you didn't have one.

Answer 2

The likely candidate for the problem is an object which has a reference to itself. Given your expression of the domain I suspect a child has a linked list which includes itself, or a cyclic reference. That is, one of the nodes it is linked to has a link to it in turn.