NIO + long-living connections

Hi!
I'm experimenting with nio http service and have got a problem with persitent (Connection: Keep-Alive) connections: I can not get more rather ~25 requests per second (using ApacheBench) for single connection. CPU is almost free(!!), and I have not any delays in my code at all, of course. Have tried with Netbeans profiler - almost all time is spent inside selector.select(to).
Any thoughts?
Edited by: anli on Jun 15, 2008 5:52 PM

It's a historically very important optimization which allows TCP to coalesce small outgoing packets into one larger packet, at the cost of increased latency. It's an IETF requirement that it be off by default for any host connected to the Internet, and Sun (and the authors of the Berkeley Sockets API before them) no doubt took their lead from that.
As the only important thing is when the last part of the message arrives, you might consider turning it off again and building up the complete response in a buffer before calling channel.write().

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    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:378)
    at java.util.ArrayList.readObject(ArrayList.java:617)
    at sun.reflect.GeneratedMethodAccessor879.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1036)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1755)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
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