在测试我的模型的持久性时，我得到一个属性被覆盖。我正在运行以下测试:
@Test
public void objectTest() throws Exception {
tester.testClass(AssetUpdateReserve.class);
Assert.assertEquals(tester.getResult().getErrors().size(), 0, "Errors found");
}
我的 AssetUpdateReserve 实体:
@Entity
@Table(name = "ASSET_UPD_RESERVE")
public class AssetUpdateReserve implements Serializable {
private static final long serialVersionUID = 6530799190088978893L;
@EmbeddedId
@AttributeOverrides({
@AttributeOverride(name = "partitionId.assetSliceId", column = @Column(name = "PARTITION_ID")),
@AttributeOverride(name = "partitionId.associatedKey", column = @Column(name = "PARTITION_ID_AK")),
@AttributeOverride(name = "containerId.id", column = @Column(name = "CONTAINER_ID")),
@AttributeOverride(name = "containerId.associatedKey", column = @Column(name = "CONTAINER_ID_AK")) })
private AssetUpdateReserveIndex id;
// Default JSON/JAXB constructor
public AssetUpdateReserve() {
}
}
据此我应该有一个具有四个属性的主键。但是，associatedKey 中的相同名称使得其中一个属性被覆盖(在这种特殊情况下，CONTAINER_ID_AK 覆盖 PARTITION_AD_AK)这使得我的主键只有三个字段。 我试图评论最后一个@AttributeOverride，这解决了问题并且该表具有 PARTITION_ID_AK 列。但是，我不能直接忽略 CONTAINER_ID_AK。
我的其他实体:
Assets 切片编号
@Embeddable
public class AssetSliceId implements Serializable {
private static final long serialVersionUID = 9065665917069565503L;
public static final int MAX_VALUE = Integer.MAX_VALUE;
@Column(name = "ASSET_SLICE_ID")
private Integer assetSliceId;
@Column(name = "ID_AK")
private String associatedKey;
public AssetSliceId() {
super();
}
}
Assets 更新储备指数:
@Embeddable
public class AssetUpdateReserveIndex implements Serializable {
private static final long serialVersionUID = 1349614023445826884L;
@Embedded
@AttributeOverrides({ @AttributeOverride(name = "assetSliceId", column = @Column(name = "SLICE_ID")),
@AttributeOverride(name = "associatedKey", column = @Column(name = "SLICE_ID_AK")) })
private AssetSliceId partitionId;
@Embedded
private InstanceId containerId;
// Default JSON/JAXB constructor
public AssetUpdateReserveIndex(){
super();
}
}
实例编号
@Embeddable
public class InstanceId implements Serializable {
private static final long serialVersionUID = -6620668219143108192L;
@Column(name = "ID")
private String id;
@Column(name = "ID_AK")
private String associatedKey;
// Apenas para utilizacao TopLink / POF
public InstanceId() {
}
}
我的 persistence.xlm 文件:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="jpa-test" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>package.persistencetester.model.jpa.attroverride.AssetSliceId</class> <class>package.persistencetester.model.jpa.attroverride.AssetUpdateReserve</class> <class>package.persistencetester.model.jpa.attroverride.AssetUpdateReserveIndex</class> <class>package.persistencetester.model.jpa.attroverride.InstanceId</class <class>package.persistencetester.model.jpa.attroverride.SubscriptionID</class>
<properties>
<!-- Default Login using Oracle for EclipseLink's internal connection pool -->
<!-- HSQL -->
<property name="javax.persistence.jdbc.driver" value="org.hsqldb.jdbcDriver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:hsqldb:hsql://localhost/persistencetesterdb"/>
<property name="javax.persistence.jdbc.user" value="sa"/>
<property name="javax.persistence.jdbc.password" value=""/>
<property name="eclipselink.logging.thread" value="false" />
<property name="eclipselink.logging.session" value="false" />
<property name="eclipselink.logging.exceptions" value="false" />
<property name="eclipselink.logging.timestamp" value="false" />
<property name="eclipselink.logging.level" value="FINE" />
</properties>
</persistence-unit>
</persistence>
最后是日志:
Call: DROP TABLE ASSET_UPD_RESERVE
Query: DataModifyQuery(sql="DROP TABLE ASSET_UPD_RESERVE")
[EL Fine]: sql: Connection(1549646215)--CREATE TABLE ASSET_UPD_RESERVE (CONTAINER_ID_AK VARCHAR(255) NOT NULL, CONTAINER_ID VARCHAR(255) NOT NULL, PARTITION_ID INTEGER NOT NULL, PARTITION_ID_AK VARCHAR(255), PRIMARY KEY (CONTAINER_ID_AK, CONTAINER_ID, PARTITION_ID))
2014-07-03 18:20:06 INFO - =============================================================================
2014-07-03 18:20:06 INFO - Testing: class package.persistencetester.model.jpa.attroverride.AssetUpdateReserve
2014-07-03 18:20:06 DEBUG - Persisting...
[EL Fine]: sql: Connection(1549646215)--INSERT INTO ASSET_UPD_RESERVE (CONTAINER_ID_AK, CONTAINER_ID, PARTITION_ID, PARTITION_ID_AK) VALUES (?, ?, ?, ?)
bind => [str3, str2, 1, str1]
2014-07-03 18:20:06 DEBUG - Retrieving...
2014-07-03 18:20:06 FATAL - [ERROR] Unexpected problem while persisting/retrieving following object:
{"package.persistencetester.model.jpa.attroverride.AssetUpdateReserve": {"id": {"partitionId": {"assetSliceId": 1,"associatedKey": "str1"},"containerId": {"id": "str2","associatedKey": "str3"}}}}
javax.persistence.PersistenceException: Exception [EclipseLink-202] (Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: An internal error occurred accessing the primary key object [package.persistencetester.model.jpa.attroverride.AssetUpdateReserveIndex@6dc27e82].
Internal Exception: java.lang.NoSuchFieldException: id
Descriptor: RelationalDescriptor(package.persistencetester.model.jpa.attroverride.AssetUpdateReserve --> [DatabaseTable(ASSET_UPD_RESERVE)])
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getIdentifier(EntityManagerFactoryDelegate.java:717)
at package.persistencetester.tester.jpa.bd.Datasource.getObjectId(Datasource.java:132)
at package.persistencetester.tester.jpa.bd.Datasource.retrieveByObject(Datasource.java:127)
at package.persistencetester.tester.jpa.JpaTester.testObjectPersistence(JpaTester.java:175)
at package.persistencetester.tester.jpa.JpaTester.testClass(JpaTester.java:142)
at package.persistencetester.tester.jpa.JpaTesterTest.objectTest(JpaTesterTest.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
Caused by: Exception [EclipseLink-202] (Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: An internal error occurred accessing the primary key object [package.persistencetester.model.jpa.attroverride.AssetUpdateReserveIndex@6dc27e82].
Internal Exception: java.lang.NoSuchFieldException: id
Descriptor: RelationalDescriptor(package.persistencetester.model.jpa.attroverride.AssetUpdateReserve --> [DatabaseTable(ASSET_UPD_RESERVE)])
at org.eclipse.persistence.exceptions.DescriptorException.errorUsingPrimaryKey(DescriptorException.java:1937)
at org.eclipse.persistence.internal.jpa.CMP3Policy$FieldAccessor.setValue(CMP3Policy.java:697)
at org.eclipse.persistence.descriptors.CMPPolicy.createPrimaryKeyInstance(CMPPolicy.java:460)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getIdentifier(EntityManagerFactoryImpl.java:90)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getIdentifier(EntityManagerFactoryDelegate.java:715)
... 29 more
Caused by: java.lang.NoSuchFieldException: id
at java.lang.Class.getDeclaredField(Class.java:1948)
at org.eclipse.persistence.internal.security.PrivilegedAccessHelper.findDeclaredField(PrivilegedAccessHelper.java:67)
at org.eclipse.persistence.internal.security.PrivilegedAccessHelper.findDeclaredField(PrivilegedAccessHelper.java:73)
at org.eclipse.persistence.internal.security.PrivilegedAccessHelper.getField(PrivilegedAccessHelper.java:223)
at org.eclipse.persistence.internal.jpa.CMP3Policy$FieldAccessor.setValue(CMP3Policy.java:693)
... 32 more
[EL Config]: connection: Connection(1549646215)--disconnect
[EL Info]: connection: file:/C:/Users/x01709/workspace2/persistence-tester/src/core/target/test-classes/_jpa-test logout successful
[EL Config]: connection: Connection(1495651843)--disconnect
注意:在日志中你可以看到创建表和主键只有3个属性，但是当插入时，有所有四个
最佳答案
根据JPA API Doc , “不支持在嵌入式 id 类中定义的关系映射。”
因为 containerId 和 partitionId 都包含一个名为 associatedKey 的字段，并且它们不能映射到 中的单独实体@EmbeddedId 类，因此创建的表不是在主键中包含所有四个值(因为它看到 associatedKey 两次，并丢弃了重复项)。
关于java - 使用 JPA 坚持时覆盖的字段，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24560085/