Question

此问题类似于此处发布的问题：Corda: error=org.hibernate.InstantiationException: No default constructor for entity

对于扩展FungibleState的自定义架构，我遇到了同样的错误（如API Vault Query documentation中所述）：

object CustomSchemaV1 : MappedSchema(schemaFamily = CustomSchema.javaClass, version = 1, mappedTypes = listOf(PersistentCustomState::class.java))
{
@Entity
@Table(name = "custom_states", indexes = arrayOf(Index(name = "custom_field_idx", columnList = "custom_field")))
class PersistentCustomState(

    /** Custom attributes */
    @Column(name = "custom_field")
    var customField: String? = null,

    /** FungibleState parent attributes */
    @Transient
    val _participants: Set<AbstractParty>,
    @Transient
    val _owner: AbstractParty,
    @Transient
    val _quantity: Long,
    @Transient
    val _issuerParty: AbstractParty,
    @Transient
    val _issuerRef: OpaqueBytes
) : CommonSchemaV1.FungibleState(_participants?.toMutableSet(), _owner, _quantity, _issuerParty, _issuerRef.bytes)}

此处的示例架构：https://github.com/corda/corda/blob/master/finance/src/test/kotlin/net/corda/finance/schemas/SampleCashSchemaV2.kt

我安装了kotlin-jpa插件。使所有字段都可以为空可以解决扩展PersistentState的模式的问题，但由于FungibleState父字段数据类型，这里不是一个选项。

Corda发布版本= 2.0.0

Answer 1

您需要在R version 3.4.3 (2017-11-30) Platform: x86_64-w64-mingw32/x64 (64-bit) Running under: Windows >= 8 x64 (build 9200) Matrix products: default attached base packages: [1] stats graphics grDevices utils datasets methods base loaded via a namespace (and not attached): [1] compiler_3.4.3 tools_3.4.3 yaml_2.1.16的正文中添加默认构造函数。类似的东西：

PersistentCustomState

难点在于传递constructor() : this(*first default value*, *second default value*, etc.)参数的默认值。你可以使用类似的东西：

AbstractParty

Corda：在自定义架构中扩展FungibleState时的InstantiationException

1 个答案: