为什么hazelcast无法从泛型记录的treemap中读取数据？

这可能是由于hazelcast默认使用Jackson序列化，而Jackson无法处理泛型类型的数据。要解决这个问题，请使用Hazelcast的DataSerializable接口，并在对象中手动序列化成字节数组。

以下是一个示例代码，演示如何使用DataSerializable接口将泛型对象写入treemap并正确地读取它们：

import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.DataSerializable;

import java.io.IOException;
import java.util.TreeMap;

public class MySerializableObject implements DataSerializable {

    private TreeMap<String, Double> data;

    public MySerializableObject() {
        data = new TreeMap<>(); // initialize data
    }

    public void addData(String key, Double value) {
        data.put(key, value); // add data to the treemap
    }

    public Double getValue(String key) {
        return data.get(key); // get the value from the treemap
    }

    @Override
    public void writeData(ObjectDataOutput out) throws IOException {
        out.writeInt(data.size()); // write the size of the data treemap
        for (String key : data.keySet()) {
            out.writeUTF(key); // write the key to the output stream
            out.writeDouble(data.get(key)); // write the value to the output stream
        }
    }

    @Override
    public void readData(ObjectDataInput in) throws IOException {
        int size = in.readInt(); // read the size of the data treemap
        data = new TreeMap<>(); // initialize a new treemap
        for (int i = 0; i < size; i++) {
            String key = in.readUTF(); // read the key from the input stream
            Double value = in.readDouble(); // read the value from the input stream
            data.put(key, value); // add the key-value pair to the treemap
        }
    }
}

现在，您可以创建一个对象，并使用addData方法向数据集添加值：

MySerializableObject obj = new MySerializableObject();
obj.addData("key