使用复合键保存实体get ConversionNotSupportedException

Question

我使用spring boot 2，我的一些实体有复合键

当我尝试保存一个实体时，我会得到这个错误

无法转换请求元素：org.springframework.beans.conversionNotSupportedException：无法将类型“java.lang.integer”的属性值转换为属性“samping”所需的类型“com.lcm.model.samplingspk”；嵌套异常为java.lang.IllegalStateException：无法将“java.lang.Integer”类型的值转换为属性“sampling”所需的类型“com.lcm.model.samplingspk”：未找到匹配的编辑器或转换策略

我用那个方法得到我的实体

public Samples findById(Integer id, int year, String sampleLetter) {
    Optional<Samples> optSamples = samplesRepository.findById(new SamplesPK(new SamplingsPK(year, id), sampleLetter));

    if (optSamples.isPresent()) {
        return optSamples.get();
    }

    return null;
}


Samples samples = samplesService.findById(idSeq, year, samplesLetter);

Compressions compressionTest = null;

if (samples.getTestSamples().getAbsorptionTest() != null) {
    compressionTest = samples.getTestSamples().getCompressionTest();
} else {
    compressionTest = new Compressions();
}

samplesService.save(samples);

我的实体

@Entity
@IdClass(SamplesPK.class)
public class Samples extends BaseEntity{
    @Id
    private String sampleLetter;

    @Embedded
    private TestSamples testSamples;

    @Id
    @ManyToOne(optional=false)
    @JoinColumns({
        @JoinColumn(name = "sampling_id", referencedColumnName = "id"),
        @JoinColumn(name = "sampling_year", referencedColumnName = "year")})
    private Samplings sampling;
}

@Entity
@IdClass(SamplingsPK.class)
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class Samplings {
    @Id
    private Integer year;

    @Id
    @GeneratedValue
    private Integer id;

    @OneToMany(mappedBy = "sampling", cascade = CascadeType.ALL, orphanRemoval = true)
    private List<Samples> samples = new ArrayList<>();
}

public class SamplingsPK implements Serializable {

    private int year;

    private Integer id;

    public SamplingsPK(int year, Integer id) {
        this.id = id;
        this.year = year;
    }
}

public class SamplesPK implements Serializable {

    private SamplingsPK sampling;

    private String sampleLetter;

    public SamplesPK(SamplingsPK sampling, String sampleLetter) {
        this.sampling = sampling;
        this.sampleLetter = sampleLetter;
    }
}

编辑

没有问题保存样本，当我通过取样

Answer 1

这个问题在https://jira.spring.io/browse/datajpa-1391中跟踪，它与samples中的@id@manytoOne的使用有关。作为一种解决办法，您可以尝试为samplings创建一个包含两个主键的构造函数，或者一个包含java.lang.integer的构造函数？这对单一级别的复合主键是有效的，但如果有多个级别，则可能不起作用。

您还将samplingspk中的year键入为int而不是integer。这可能会导致PK识别的问题，因为需要特别考虑处理AutoBox的原始类，我怀疑这是考虑过的。