Hibernate在查询时抛出StackOverflowError [英] Hibernate throws StackOverflowError when querying
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问题描述
我有两个这样定义的实体:
I have two entities defined as so:
@Entity
@Table(name = "shapes")
public class Shape {
@Id
private int id;
@Column(nullable = false)
private String name;
@OneToMany(mappedBy="shape", fetch = FetchType.EAGER)
private List<ShapeElement> shapeElements;
public int getId() {
return id;
}
}
并且:
@Entity
@IdClass(ShapeElementPK.class)
@Table(name = "shape_elements")
public class ShapeElement {
@Id
@ManyToOne
@JoinColumn(name = "shape_id")
private Shape shape;
@Id
@Column(name = "x_delta")
private int xDelta;
@Id
@Column(name = "y_delta")
private int yDelta;
}
具有以下IdClass:
With the following IdClass:
@Embeddable
public class ShapeElementPK implements Serializable {
private static final long serialVersionUID = 284329766961384662L;
private Shape shape;
private int xDelta;
private int yDelta;
@Override
public boolean equals(Object otherObject) {
if (! (otherObject instanceof ShapeElementPK)) {
return false;
}
ShapeElementPK otherPK = (ShapeElementPK) otherObject;
return otherPK.shape.getId() == shape.getId() &&
otherPK.xDelta == xDelta &&
otherPK.yDelta == yDelta;
}
@Override
public int hashCode() {
int hash = 5;
hash = 11 * hash + Objects.hashCode(this.shape);
hash = 11 * hash + this.xDelta;
hash = 11 * hash + this.yDelta;
return hash;
}
}
现在我跑步
List<Shape> allShapes = session.createCriteria(Shape.class).list();
我最终遇到了带有以下追溯的StackOverflowError:
I end up with a StackOverflowError with the following back trace:
Caused by: java.lang.StackOverflowError
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com.mysql.jdbc.StatementImpl.getWarnings(StatementImpl.java:2556)
at com.zaxxer.hikari.proxy.PreparedStatementJavassistProxy.getWarnings(PreparedStatementJavassistProxy.java)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.handleAndClearWarnings(SqlExceptionHelper.java:320)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.logAndClearWarnings(SqlExceptionHelper.java:273)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.close(JdbcCoordinatorImpl.java:529)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.release(JdbcCoordinatorImpl.java:421)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:160)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:102)
at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com.mysql.jdbc.StatementImpl.getWarnings(StatementImpl.java:2556)
at com.zaxxer.hikari.proxy.PreparedStatementJavassistProxy.getWarnings(PreparedStatementJavassistProxy.java)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.handleAndClearWarnings(SqlExceptionHelper.java:320)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.logAndClearWarnings(SqlExceptionHelper.java:273)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.close(JdbcCoordinatorImpl.java:529)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.release(JdbcCoordinatorImpl.java:421)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:160)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:102)
at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:186)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4126)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:503)
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:468)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:213)
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:275)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070)
at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:989)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:716)
at org.hibernate.type.EntityType.resolve(EntityType.java:502)
at org.hibernate.type.ComponentType.resolve(ComponentType.java:666)
at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.resolveEntityKey(EntityReferenceInitializerImpl.java:158)
at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.resolveEntityKey(AbstractRowReader.java:148)
at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.readRow(AbstractRowReader.java:97)
at org.hibernate.loader.plan.exec.internal.EntityLoadQueryDetails$EntityLoaderRowReader.readRow(EntityLoadQueryDetails.java:255)
at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:129)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:138)
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:102)
at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:186)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4126)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:503)
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:468)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:213)
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:275)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070)
at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:989)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:716)
at org.hibernate.type.EntityType.resolve(EntityType.java:502)
at org.hibernate.type.ComponentType.resolve(ComponentType.java:666)
.... etc ... it keeps repeating like this ...
我做错了什么?这是Hibernate 4.3.6.Final版本的.
What am I doing wrong? This is with Hibernate 4.3.6.Final.
编辑
我将ShapeElementPK更改为以下内容，似乎已经解决了该问题:
I changed the ShapeElementPK to the following, and it seems to have solved the issue:
@Embeddable
public class ShapeElementPK implements Serializable {
private static final long serialVersionUID = 284329766961384662L;
private int shape;
private int xDelta;
private int yDelta;
@Override
public boolean equals(Object otherObject) {
if (! (otherObject instanceof ShapeElementPK)) {
return false;
}
ShapeElementPK otherPK = (ShapeElementPK) otherObject;
return otherPK.shape == shape &&
otherPK.xDelta == xDelta &&
otherPK.yDelta == yDelta;
}
@Override
public int hashCode() {
int hash = 5;
hash = 11 * hash + this.shape;
hash = 11 * hash + this.xDelta;
hash = 11 * hash + this.yDelta;
return hash;
}
}
更改是将Shape定义为int而不是ShapeElementPK中的Shape.
The change was to define shape as an int instead of a Shape in the ShapeElementPK.
推荐答案
这可能是由于模型之间存在循环关系.是否可以使用shape_id代替ShapeElementPK中的整个Shape对象?
This is probably due to a cyclic relation between models. Is it possible to use shape_id instead of the whole Shape object in ShapeElementPK?
这篇关于Hibernate在查询时抛出StackOverflowError的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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