我正在尝试使用Kryo 2.19和默认序列化程序(FieldSerializer),将自定义类(例如SomeClass,具有默认无参构造函数)的对象序列化和反序列化为byte[]数组。 序列化似乎可以正常工作,但在反序列化时,根据SomeClass的实际实现,我会得到各种异常。 代码大致如下:
我收到的异常示例是:
似乎参数化类型在反序列化时存在问题。为了测试这一假设,这里提供了一个带参数化实现的
这个序列化很好,但是反序列化会抛出以下异常(注意字符串的第一个字母在异常原因中未报告):
如果上述类没有参数化实现(即,将
有任何想法吗?
SomeClass object = getObject(); // Create and populate a new object of SomeClass
Kryo kryo = new Kryo();
FieldSerializer<?> serializer = new FieldSerializer<SomeClass>(kryo, SomeClass.class);
kryo.register(SomeClass.class, serializer);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
Output output = new Output(stream);
kryo.writeObject(output, object);
output.close(); // Also calls output.flush()
byte[] buffer = stream.toByteArray(); // Serialization done, get bytes
// Deserialize the serialized object.
object = kryo.readObject(new Input(new ByteArrayInputStream(buffer)), SomeClass.class);
我收到的异常示例是:
An example of the exceptions I am getting is:
Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.objectweb.asm.MethodVisitor, but class was expected
at com.esotericsoftware.reflectasm.ConstructorAccess.insertConstructor(ConstructorAccess.java:89)
at com.esotericsoftware.reflectasm.ConstructorAccess.get(ConstructorAccess.java:70)
at com.esotericsoftware.kryo.Kryo.newInstantiator(Kryo.java:1009)
at com.esotericsoftware.kryo.Kryo.newInstance(Kryo.java:1059)
at com.esotericsoftware.kryo.serializers.FieldSerializer.create(FieldSerializer.java:228)
at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:217)
at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:629)
似乎参数化类型在反序列化时存在问题。为了测试这一假设,这里提供了一个带参数化实现的
SomeClass
和getObject()
函数:class SomeClass<T extends Serializable>
{
private final T[] elements;
private final int first;
private final int second;
private SomeClass()
{
this.elements = null;
this.first = 0;
this.second = 0;
}
private SomeClass(T[] elements, int first, int second)
{
this.elements = elements;
this.first = first;
this.second = second;
}
}
SomeClass<?> getObject()
{
String[] elements = new String[] {"This is a test", "one"};
return new SomeClass<String>(elements, 1, 2);
}
这个序列化很好,但是反序列化会抛出以下异常(注意字符串的第一个字母在异常原因中未报告):
Exception in thread "main" com.esotericsoftware.kryo.KryoException: Unable to find class: his is a test
Serialization trace:
elements (net.cetas.parserserver.data.report.SourceDataReporter$SomeClass)
at com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:132)
at com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:109)
at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:613)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:724)
at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.read(DefaultArraySerializers.java:338)
at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.read(DefaultArraySerializers.java:293)
at com.esotericsoftware.kryo.Kryo.readObjectOrNull(Kryo.java:702)
at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:521)
at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221)
at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:629)
如果上述类没有参数化实现(即,将
elements
数组声明为String[]
),反序列化将按预期工作。有任何想法吗?
SomeClass<T extends Serializable>
。 - Dahaka