我正在嘗試運行 Contract 的 corda-bootcamp 測試用例。我按照視頻中給出的方式進行操作，但是當嘗試運行合同測試時 - 我收到錯誤java.io.NotSerializableException: data(net.corda.core.contracts.ContractState) -> Trying to build an object serializer for bootcamp.TokenState, but it is not constructible from its public properties, and so requires a custom serialiser.有人可以幫忙嗎，如何解決這個問題？我發現了類似的問題-here ，但這不起作用。下面是使用的 Tokenstate，package bootcamp;import com.google.common.collect.ImmutableList;import net.corda.core.contracts.BelongsToContract;import net.corda.core.contracts.ContractState;import net.corda.core.identity.AbstractParty;import net.corda.core.identity.Party;import java.util.ArrayList;import java.util.List;/* Our state, defining a shared fact on the ledger. * See src/main/java/examples/ArtState.java for an example. */@BelongsToContract(TokenContract.class)public class TokenState implements ContractState {    private Party issuer;    private Party owner;    private int amount;    public TokenState(Party issuer, Party owner, int amount) {        this.issuer = issuer;        this.owner = owner;        this.amount = amount;    }    public Party getIssuer() {        return issuer;    }    public Party getOwner() {        return owner;    }    public int getAmount() {        return amount;    }    public List<AbstractParty> getParticipants() {        List<AbstractParty> participants = new ArrayList<>();        participants.add(issuer);        participants.add(owner);        return participants;    }}