我在使用复合键通过附加表绑定实体时遇到问题：
类产品
@Entity
public class Product implements Serializable {
@Id
@Column(name = "product_id")
private Integer productId;
...
@OneToMany(cascade = CascadeType.ALL, mappedBy = "product", fetch = FetchType.LAZY)
private Collection<ProductProperty> productPropertyCollection;
...
get/set
...
public void addProductProperty(ProductProperty productProperty) {
productPropertyCollection.add(productProperty);
if (productProperty.getProduct()!=this) {
productProperty.setProduct(this);
}
}
}
类属性
@Entity
public class Property implements Serializable {
@Id
@Column(name = "property_id")
private Integer id;
...
@OneToMany(cascade = CascadeType.ALL, mappedBy = "property", fetch = FetchType.LAZY)
private Collection<ProductProperty> productPropertyCollection;
...
get/set
...
public void addProductProperty(ProductProperty productProperty) {
productPropertyCollection.add(productProperty);
if (productProperty.getProperty()!=this) {
productProperty.setProperty(this);
}
}
}
类 ProductProperty
@Entity
@IdClass(ProductPropertyPK.class)
public class ProductProperty implements Serializable {
@Id
@ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(name = "property_id", referencedColumnName = "property_id")
private Property property;
@Id
@ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(name = "product_id", referencedColumnName = "product_id")
private Product product;
public void setProperty(Property property) {
this.property = property;
if (!property.getProductPropertyCollection().contains(this)) {
property.getProductPropertyCollection().add(this);
}
}
public void setProduct(Product product) {
this.product = product;
if (!product.getProductPropertyCollection().contains(this)) {
product.getProductPropertyCollection().add(this);
}
}
}
使用实体：
for (Offer o : offers.getOffers()) {
jpa.product.Product product = cacheProduct_indexIdx.get(o.getProductsId());
for (Property p : o.getProperties()) {
PropertyTypeNamePK propertyTypeNamePK = new PropertyTypeNamePK(p.getType(), p.getName());
if (!cacheProperty_indexTypeNamePK.containsKey(propertyTypeNamePK)) {
jpa.product.Property property = new jpa.product.Property();
property.setType(p.getType());
property.setName(p.getName());
propertyFacade.create(property);
jpa.product.ProductProperty productProperty = new ProductProperty();
product.addProductProperty(productProperty);
property.addProductProperty(productProperty);
cacheProperty_indexTypeNamePK.put(propertyTypeNamePK, property);
} else {
jpa.product.Property property = cacheProperty_indexTypeNamePK.get(propertyTypeNamePK);
jpa.product.ProductProperty productProperty = null;
for (jpa.product.ProductProperty pp : product.getProductPropertyCollection()) {
if (property.equals(pp.getProperty())) {
productProperty = pp;
break;
}
}
if (productProperty==null) {
productProperty = new ProductProperty();
product.addProductProperty(productProperty);
property.addProductProperty(productProperty);
}
}
}
}
它适用于 1, 10, 100 products，但在某处出现错误，因为对于 1000 和更多products抛出错误：
Caused by: java.lang.StackOverflowError
at java.text.DecimalFormat.subformat(DecimalFormat.java:903)
at java.text.DecimalFormat.format(DecimalFormat.java:692)
at java.text.DecimalFormat.format(DecimalFormat.java:626)
at java.text.SimpleDateFormat.zeroPaddingNumber(SimpleDateFormat.java:1335)
at java.text.SimpleDateFormat.subFormat(SimpleDateFormat.java:1274)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:978)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:948)
at java.text.DateFormat.format(DateFormat.java:336)
at com.sun.enterprise.server.logging.UniformLogFormatter.uniformLogFormat(UniformLogFormatter.java:265)
at com.sun.enterprise.server.logging.UniformLogFormatter.format(UniformLogFormatter.java:162)
at java.util.logging.StreamHandler.publish(StreamHandler.java:196)
at java.util.logging.ConsoleHandler.publish(ConsoleHandler.java:105)
at java.util.logging.Logger.log(Logger.java:565)
at org.eclipse.persistence.logging.JavaLog.internalLog(JavaLog.java:290)
at org.eclipse.persistence.logging.JavaLog.log(JavaLog.java:261)
at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:3215)
at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:4333)
at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:4305)
at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:4281)
at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:4203)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.logDebugMessage(UnitOfWorkImpl.java:5559)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNotRegisteredNewObjectForPersist(UnitOfWorkImpl.java:4250)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.registerNotRegisteredNewObjectForPersist(RepeatableWriteUnitOfWork.java:511)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.discoverAndPersistUnregisteredNewObjects(UnitOfWorkImpl.java:4160)
at org.eclipse.persistence.mappings.CollectionMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(CollectionMapping.java:426)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectBuilder.java:1964)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.discoverAndPersistUnregisteredNewObjects(UnitOfWorkImpl.java:4178)
at org.eclipse.persistence.mappings.ObjectReferenceMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectReferenceMapping.java:938)
at org.eclipse.persistence.mappings.ObjectReferenceMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectReferenceMapping.java:916)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectBuilder.java:1964)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.discoverAndPersistUnregisteredNewObjects(UnitOfWorkImpl.java:4178)
at org.eclipse.persistence.mappings.CollectionMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(CollectionMapping.java:426)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectBuilder.java:1964)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.discoverAndPersistUnregisteredNewObjects(UnitOfWorkImpl.java:4178)
at org.eclipse.persistence.mappings.ObjectReferenceMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectReferenceMapping.java:938)
at org.eclipse.persistence.mappings.ObjectReferenceMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectReferenceMapping.java:916)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectBuilder.java:1964)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.discoverAndPersistUnregisteredNewObjects(UnitOfWorkImpl.java:4178)
at org.eclipse.persistence.mappings.CollectionMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(CollectionMapping.java:426)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectBuilder.java:1964)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.discoverAndPersistUnregisteredNewObjects(UnitOfWorkImpl.java:4178)
at org.eclipse.persistence.mappings.ObjectReferenceMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectReferenceMapping.java:938)
at org.eclipse.persistence.mappings.ObjectReferenceMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectReferenceMapping.java:916)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectBuilder.java:1964)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.discoverAndPersistUnregisteredNewObjects(UnitOfWorkImpl.java:4178)
at org.eclipse.persistence.mappings.CollectionMapping.cascadeDiscoverAndPersistUnregisteredNewObjects(CollectionMapping.java:426)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.cascadeDiscoverAndPersistUnregisteredNewObjects(ObjectBuilder.java:1964)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.discoverAndPersistUnregisteredNewObjects(UnitOfWorkImpl.java:4178)