Kryo 2.24.0 / 3.0.3 StackOverflowError with generics

build.gradle

apply plugin: "java"

repositories {
  mavenCentral()
}

dependencies {
  testCompile "junit:junit:4.12"
  //testCompile "com.esotericsoftware.kryo:kryo:2.24.0"
  testCompile "com.esotericsoftware:kryo:3.0.3"
}

result.txt

Testing started at 21:58 ...
21:58:14: Executing external tasks 'cleanTest test --tests "StackOverflowTest_2_24_0.goBananas"'...
:cleanTest
:compileJava UP-TO-DATE
:processResources UP-TO-DATE
:classes UP-TO-DATE
:compileTestJava
:processTestResources UP-TO-DATE
:testClasses
:test
StackOverflowTest_2_24_0 > goBananas FAILED

java.lang.StackOverflowError
	at java.util.HashMap.hash(HashMap.java:338)
	at java.util.HashMap.get(HashMap.java:556)
	at com.esotericsoftware.kryo.Generics.getConcreteClass(Generics.java:43)
	at com.esotericsoftware.kryo.Generics.getConcreteClass(Generics.java:44)
	at com.esotericsoftware.kryo.Generics.getConcreteClass(Generics.java:44)
	at com.esotericsoftware.kryo.Generics.getConcreteClass(Generics.java:44)
	at com.esotericsoftware.kryo.Generics.getConcreteClass(Generics.java:44)
	at com.esotericsoftware.kryo.Generics.getConcreteClass(Generics.java:44)
	[...]
	at com.esotericsoftware.kryo.Generics.getConcreteClass(Generics.java:44)

    java.lang.StackOverflowError
1 test completed, 1 failed
:test FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':test'.
> There were failing tests. See the report at: file:///Users/ajvanerp/src/hierynomus/kryoverflow/build/reports/tests/index.html
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 5.514 secs
There were failing tests. See the report at: file:///Users/ajvanerp/src/hierynomus/kryoverflow/build/reports/tests/index.html

StackOverflowTest.java

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.FastOutput;
import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.ArrayList;

public class StackOverflowTest_2_24_0 {

  @Test
  public void thisWorks() {
    FooRef fooRef = new FooRef();
    GenericFoo<FooRef> genFoo1 = new GenericFoo<>(fooRef);
    GenericFoo<FooRef> genFoo2 = new GenericFoo<>(fooRef);
    List<GenericFoo<?>> foos = new ArrayList<>();
    // Note the order of the items in the list (vs goBananas)
    foos.add(genFoo1);
    foos.add(genFoo2);
    new FooContainer(foos);
    Kryo kryo = new Kryo();
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

    kryo.writeObject(new FastOutput(outputStream), genFoo1);
  }

    @Test
  public void goBananas() {
    FooRef fooRef = new FooRef();
    GenericFoo<FooRef> genFoo1 = new GenericFoo<>(fooRef);
    GenericFoo<FooRef> genFoo2 = new GenericFoo<>(fooRef);
    List<GenericFoo<?>> foos = new ArrayList<>();
    // Note the order of the items in the list (vs thisWorks)
    foos.add(genFoo2);
    foos.add(genFoo1);
    new FooContainer(foos);
    Kryo kryo = new Kryo();
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

    kryo.writeObject(new FastOutput(outputStream), genFoo1);
  }
  
}

class FooContainer {
  List<GenericFoo<?>> foos;

  public FooContainer(List<GenericFoo<?>> foos) {
    this.foos = foos;
    for (GenericFoo<?> foo : foos) {
      foo.container = this;
    }
  }
}

interface Foo {}
class FooRef implements Foo {}
class GenericFoo<B extends Foo> implements Foo {
  private Map<String, Object> map = Collections.singletonMap("myself", (Object) this);
  B foo;
  FooContainer container;

  public GenericFoo(B foo) {
    this.foo = foo;
  }
}

ThreeLevelsDownStackOverflow.java

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.FastOutput;
import com.esotericsoftware.minlog.Log;
import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * Created by ajvanerp on 24/08/15.
 */
public class ThreeLevelsDownStackOverflow {
    @Test
    public void goBananas() {
        BarRef barRef = new BarRef();
        GenericBar<BarRef> genBar1 = new GenericBar<>(barRef);
        GenericBar<BarRef> genBar2 = new GenericBar<>(barRef);
        List<GenericBar<?>> bars = new ArrayList<>();
        bars.add(genBar2);
        bars.add(genBar1);
        // Now added another generics class in the mix.
        // During serialization there now is no direct link between genericsScope and parentScope
        // But rather there is a cycle. 
        new GenericContainer<>(new BarContainer(bars));
        Kryo kryo = new Kryo();
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        Log.set(Log.LEVEL_TRACE);
        kryo.writeObject(new FastOutput(outputStream), genBar1);
    }
}

class GenericContainer<T extends Bar> {
    BarContainer barContainer;

    public GenericContainer(BarContainer barContainer) {
        this.barContainer = barContainer;
        for (GenericBar<?> foo : barContainer.foos) {
            foo.container = this;
        }
    }
}

class BarContainer {
    List<GenericBar<?>> foos;

    public BarContainer(List<GenericBar<?>> foos) {
        this.foos = foos;
    }
}

interface Bar {}
class BarRef implements Bar {}
class GenericBar<B extends Bar> implements Bar {
    private Map<String, Object> map = Collections.singletonMap("myself", (Object) this);
    B foo;
    GenericContainer<?> container;

    public GenericBar(B foo) {
        this.foo = foo;
    }
}

trace (goBananas).log

00:00 TRACE: [kryo] Write initial object reference 0: GenericFoo
00:00 DEBUG: [kryo] Write: GenericFoo
00:00 TRACE: [kryo] Optimize ints: true
00:00 TRACE: [kryo] Class GenericFoo has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=B type bounds=[interface Foo]
00:00 TRACE: [kryo] Trying to use kryo.getGenericScope
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Field 'map' of type interface java.util.Map of generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
00:00 TRACE: [kryo] Processing generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Processing actual type class java.lang.String (java.lang.Class)
00:00 TRACE: [kryo] Processing actual type class java.lang.Object (java.lang.Class)
00:00 TRACE: [kryo] Class java.util.Map has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=K type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for K is: java.lang.String
00:00 TRACE: [kryo] Type parameter variable: name=V type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for V is: java.lang.Object
00:00 TRACE: [kryo] Generics scope of field 'map' of class java.util.Map<java.lang.String, java.lang.Object> is {V=class java.lang.Object, K=class java.lang.String}
00:00 TRACE: [kryo] Determined concrete class of parametrized 'map' to be java.util.Map<java.lang.String, java.lang.Object> where type parameters are [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Field generics: [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Field 'foo' of type interface Foo of generic type B
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.TypeVariableImpl
00:00 TRACE: [kryo] Generics scope of field 'foo' of class B is null
00:00 TRACE: [kryo] Field container: class FooContainer
00:00 TRACE: [kryo] Register class name: GenericFoo (com.esotericsoftware.kryo.serializers.FieldSerializer)
00:00 TRACE: [kryo] FieldSerializer.write fields of class: GenericFoo
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Write field: container (GenericFoo) pos=1
00:00 TRACE: [kryo] Optimize ints: true
00:00 TRACE: [kryo] Field 'foos' of type interface java.util.List of generic type java.util.List<GenericFoo<?>>
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
00:00 TRACE: [kryo] Processing generic type java.util.List<GenericFoo<?>>
00:00 TRACE: [kryo] Processing actual type GenericFoo<?> (sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl)
00:00 TRACE: [kryo] Class java.util.List has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=E type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for E is: GenericFoo
00:00 TRACE: [kryo] Generics scope of field 'foos' of class java.util.List<GenericFoo<?>> is {E=class GenericFoo}
00:00 TRACE: [kryo] Determined concrete class of parametrized 'foos' to be java.util.List<GenericFoo<?>> where type parameters are [class GenericFoo]
00:00 TRACE: [kryo] Field generics: [class GenericFoo]
00:00 TRACE: [kryo] Register class name: FooContainer (com.esotericsoftware.kryo.serializers.FieldSerializer)
00:00 TRACE: [kryo] Write class name: FooContainer
00:00 TRACE: [kryo] Write initial object reference 1: FooContainer
00:00 DEBUG: [kryo] Write: FooContainer
00:00 TRACE: [kryo] FieldSerializer.write fields of class: FooContainer
00:00 TRACE: [kryo] Write field: foos (FooContainer) pos=16
00:00 TRACE: [kryo] Register class name: java.util.ArrayList (com.esotericsoftware.kryo.serializers.CollectionSerializer)
00:00 TRACE: [kryo] Write class name: java.util.ArrayList
00:00 TRACE: [kryo] Write initial object reference 2: [GenericFoo@5d3411d, GenericFoo@3c679bde]
00:00 DEBUG: [kryo] Write: [GenericFoo@5d3411d, GenericFoo@3c679bde]
00:00 TRACE: [kryo] Write class name: GenericFoo
00:00 TRACE: [kryo] Write initial object reference 3: GenericFoo
00:00 DEBUG: [kryo] Write: GenericFoo
00:00 TRACE: [kryo] FieldSerializer.write fields of class: GenericFoo
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Write field: container (GenericFoo) pos=52
00:00 TRACE: [kryo] Write class name reference 0: FooContainer
00:00 DEBUG: [kryo] Write object reference 1: FooContainer
00:00 TRACE: [kryo] Write field: foo (GenericFoo) pos=55
00:00 TRACE: [kryo] Optimize ints: true
00:00 TRACE: [kryo] Register class name: FooRef (com.esotericsoftware.kryo.serializers.FieldSerializer)
00:00 TRACE: [kryo] Write class name: FooRef
00:00 TRACE: [kryo] Write initial object reference 4: FooRef
00:00 DEBUG: [kryo] Write: FooRef
00:00 TRACE: [kryo] FieldSerializer.write fields of class: FooRef
00:00 TRACE: [kryo] Write field: map (GenericFoo) pos=64
00:00 TRACE: [kryo] Register class name: java.util.Collections$SingletonMap (com.esotericsoftware.kryo.serializers.DefaultSerializers$CollectionsSingletonMapSerializer)
00:00 TRACE: [kryo] Write class name: java.util.Collections$SingletonMap
00:00 TRACE: [kryo] Write initial object reference 5: {myself=GenericFoo@5d3411d}
00:00 DEBUG: [kryo] Write: {myself=GenericFoo@5d3411d}
00:00 TRACE: [kryo] Write class 1: String
00:00 TRACE: [kryo] Write initial object reference 6: myself
00:00 TRACE: [kryo] Write: myself
00:00 TRACE: [kryo] Write class name reference 2: GenericFoo
00:00 DEBUG: [kryo] Write object reference 3: GenericFoo
00:00 TRACE: [kryo] Class GenericFoo has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=B type bounds=[interface Foo]
00:00 TRACE: [kryo] Trying to use kryo.getGenericScope
00:00 TRACE: [kryo] Object graph complete.

java.lang.StackOverflowError

trace (thisWorks).log

00:00 TRACE: [kryo] Write initial object reference 0: GenericFoo
00:00 DEBUG: [kryo] Write: GenericFoo
00:00 TRACE: [kryo] Optimize ints: true
00:00 TRACE: [kryo] Class GenericFoo has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=B type bounds=[interface Foo]
00:00 TRACE: [kryo] Trying to use kryo.getGenericScope
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Field 'map' of type interface java.util.Map of generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
00:00 TRACE: [kryo] Processing generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Processing actual type class java.lang.String (java.lang.Class)
00:00 TRACE: [kryo] Processing actual type class java.lang.Object (java.lang.Class)
00:00 TRACE: [kryo] Class java.util.Map has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=K type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for K is: java.lang.String
00:00 TRACE: [kryo] Type parameter variable: name=V type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for V is: java.lang.Object
00:00 TRACE: [kryo] Generics scope of field 'map' of class java.util.Map<java.lang.String, java.lang.Object> is {V=class java.lang.Object, K=class java.lang.String}
00:00 TRACE: [kryo] Determined concrete class of parametrized 'map' to be java.util.Map<java.lang.String, java.lang.Object> where type parameters are [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Field generics: [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Field 'foo' of type interface Foo of generic type B
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.TypeVariableImpl
00:00 TRACE: [kryo] Generics scope of field 'foo' of class B is null
00:00 TRACE: [kryo] Field container: class FooContainer
00:00 TRACE: [kryo] Register class name: GenericFoo (com.esotericsoftware.kryo.serializers.FieldSerializer)
00:00 TRACE: [kryo] FieldSerializer.write fields of class: GenericFoo
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Write field: container (GenericFoo) pos=1
00:00 TRACE: [kryo] Optimize ints: true
00:00 TRACE: [kryo] Field 'foos' of type interface java.util.List of generic type java.util.List<GenericFoo<?>>
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
00:00 TRACE: [kryo] Processing generic type java.util.List<GenericFoo<?>>
00:00 TRACE: [kryo] Processing actual type GenericFoo<?> (sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl)
00:00 TRACE: [kryo] Class java.util.List has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=E type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for E is: GenericFoo
00:00 TRACE: [kryo] Generics scope of field 'foos' of class java.util.List<GenericFoo<?>> is {E=class GenericFoo}
00:00 TRACE: [kryo] Determined concrete class of parametrized 'foos' to be java.util.List<GenericFoo<?>> where type parameters are [class GenericFoo]
00:00 TRACE: [kryo] Field generics: [class GenericFoo]
00:00 TRACE: [kryo] Register class name: FooContainer (com.esotericsoftware.kryo.serializers.FieldSerializer)
00:00 TRACE: [kryo] Write class name: FooContainer
00:00 TRACE: [kryo] Write initial object reference 1: FooContainer
00:00 DEBUG: [kryo] Write: FooContainer
00:00 TRACE: [kryo] FieldSerializer.write fields of class: FooContainer
00:00 TRACE: [kryo] Write field: foos (FooContainer) pos=16
00:00 TRACE: [kryo] Register class name: java.util.ArrayList (com.esotericsoftware.kryo.serializers.CollectionSerializer)
00:00 TRACE: [kryo] Write class name: java.util.ArrayList
00:00 TRACE: [kryo] Write initial object reference 2: [GenericFoo@3c679bde, GenericFoo@5d3411d]
00:00 DEBUG: [kryo] Write: [GenericFoo@3c679bde, GenericFoo@5d3411d]
00:00 TRACE: [kryo] Write class name: GenericFoo
00:00 DEBUG: [kryo] Write object reference 0: GenericFoo
00:00 TRACE: [kryo] Class GenericFoo has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=B type bounds=[interface Foo]
00:00 TRACE: [kryo] Trying to use kryo.getGenericScope
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Field container: class FooContainer
00:00 TRACE: [kryo] Field 'foo' of type interface Foo of generic type B
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.TypeVariableImpl
00:00 TRACE: [kryo] Generics scope of field 'foo' of class B is null
00:00 TRACE: [kryo] Field 'map' of type interface java.util.Map of generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
00:00 TRACE: [kryo] Processing generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Processing actual type class java.lang.String (java.lang.Class)
00:00 TRACE: [kryo] Processing actual type class java.lang.Object (java.lang.Class)
00:00 TRACE: [kryo] Class java.util.Map has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=K type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for K is: java.lang.String
00:00 TRACE: [kryo] Type parameter variable: name=V type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for V is: java.lang.Object
00:00 TRACE: [kryo] Generics scope of field 'map' of class java.util.Map<java.lang.String, java.lang.Object> is {V=class java.lang.Object, K=class java.lang.String}
00:00 TRACE: [kryo] Determined concrete class of parametrized 'map' to be java.util.Map<java.lang.String, java.lang.Object> where type parameters are [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Field generics: [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Write class name reference 2: GenericFoo
00:00 TRACE: [kryo] Write initial object reference 3: GenericFoo
00:00 DEBUG: [kryo] Write: GenericFoo
00:00 TRACE: [kryo] FieldSerializer.write fields of class: GenericFoo
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Write field: container (GenericFoo) pos=55
00:00 TRACE: [kryo] Write class name reference 0: FooContainer
00:00 DEBUG: [kryo] Write object reference 1: FooContainer
00:00 TRACE: [kryo] Write field: foo (GenericFoo) pos=58
00:00 TRACE: [kryo] Optimize ints: true
00:00 TRACE: [kryo] Register class name: FooRef (com.esotericsoftware.kryo.serializers.FieldSerializer)
00:00 TRACE: [kryo] Write class name: FooRef
00:00 TRACE: [kryo] Write initial object reference 4: FooRef
00:00 DEBUG: [kryo] Write: FooRef
00:00 TRACE: [kryo] FieldSerializer.write fields of class: FooRef
00:00 TRACE: [kryo] Write field: map (GenericFoo) pos=67
00:00 TRACE: [kryo] Register class name: java.util.Collections$SingletonMap (com.esotericsoftware.kryo.serializers.DefaultSerializers$CollectionsSingletonMapSerializer)
00:00 TRACE: [kryo] Write class name: java.util.Collections$SingletonMap
00:00 TRACE: [kryo] Write initial object reference 5: {myself=GenericFoo@5d3411d}
00:00 DEBUG: [kryo] Write: {myself=GenericFoo@5d3411d}
00:00 TRACE: [kryo] Write class 1: String
00:00 TRACE: [kryo] Write initial object reference 6: myself
00:00 TRACE: [kryo] Write: myself
00:00 TRACE: [kryo] Write class name reference 2: GenericFoo
00:00 DEBUG: [kryo] Write object reference 3: GenericFoo
00:00 TRACE: [kryo] Class GenericFoo has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=B type bounds=[interface Foo]
00:00 TRACE: [kryo] Trying to use kryo.getGenericScope
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Field container: class FooContainer
00:00 TRACE: [kryo] Field 'foo' of type interface Foo of generic type B
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.TypeVariableImpl
00:00 TRACE: [kryo] Generics scope of field 'foo' of class B is null
00:00 TRACE: [kryo] Field 'map' of type interface java.util.Map of generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
00:00 TRACE: [kryo] Processing generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Processing actual type class java.lang.String (java.lang.Class)
00:00 TRACE: [kryo] Processing actual type class java.lang.Object (java.lang.Class)
00:00 TRACE: [kryo] Class java.util.Map has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=K type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for K is: java.lang.String
00:00 TRACE: [kryo] Type parameter variable: name=V type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for V is: java.lang.Object
00:00 TRACE: [kryo] Generics scope of field 'map' of class java.util.Map<java.lang.String, java.lang.Object> is {V=class java.lang.Object, K=class java.lang.String}
00:00 TRACE: [kryo] Determined concrete class of parametrized 'map' to be java.util.Map<java.lang.String, java.lang.Object> where type parameters are [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Field generics: [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Write field: foo (GenericFoo) pos=115
00:00 TRACE: [kryo] Write class name reference 3: FooRef
00:00 DEBUG: [kryo] Write object reference 4: FooRef
00:00 TRACE: [kryo] Write field: map (GenericFoo) pos=118
00:00 TRACE: [kryo] Write class name reference 4: java.util.Collections$SingletonMap
00:00 TRACE: [kryo] Write initial object reference 7: {myself=GenericFoo@3c679bde}
00:00 DEBUG: [kryo] Write: {myself=GenericFoo@3c679bde}
00:00 TRACE: [kryo] Write class 1: String
00:00 DEBUG: [kryo] Write object reference 6: myself
00:00 TRACE: [kryo] Write class name reference 2: GenericFoo
00:00 DEBUG: [kryo] Write object reference 0: GenericFoo
00:00 TRACE: [kryo] Class GenericFoo has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=B type bounds=[interface Foo]
00:00 TRACE: [kryo] Trying to use kryo.getGenericScope
00:00 TRACE: [kryo] Settting a new generics scope for class GenericFoo: {}
00:00 TRACE: [kryo] Field container: class FooContainer
00:00 TRACE: [kryo] Field 'foo' of type interface Foo of generic type B
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.TypeVariableImpl
00:00 TRACE: [kryo] Generics scope of field 'foo' of class B is null
00:00 TRACE: [kryo] Field 'map' of type interface java.util.Map of generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Field generic type is of class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl
00:00 TRACE: [kryo] Processing generic type java.util.Map<java.lang.String, java.lang.Object>
00:00 TRACE: [kryo] Processing actual type class java.lang.String (java.lang.Class)
00:00 TRACE: [kryo] Processing actual type class java.lang.Object (java.lang.Class)
00:00 TRACE: [kryo] Class java.util.Map has generic type parameters
00:00 TRACE: [kryo] Type parameter variable: name=K type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for K is: java.lang.String
00:00 TRACE: [kryo] Type parameter variable: name=V type bounds=[class java.lang.Object]
00:00 TRACE: [kryo] Concrete type used for V is: java.lang.Object
00:00 TRACE: [kryo] Generics scope of field 'map' of class java.util.Map<java.lang.String, java.lang.Object> is {V=class java.lang.Object, K=class java.lang.String}
00:00 TRACE: [kryo] Determined concrete class of parametrized 'map' to be java.util.Map<java.lang.String, java.lang.Object> where type parameters are [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Field generics: [class java.lang.String, class java.lang.Object]
00:00 TRACE: [kryo] Object graph complete.

Process finished with exit code 0