OutOfMemory错误:超出GC开销限制-休眠

Question

我正在使用hibernate将数据保存到表中。我有我的实体类和主类，通过主类我调用了实体类构造函数并构建了对象，在for循环中，通过hibernate将对象保存到DB。我正在失去记忆错误：GC开销超出了限制，我不明白为什么，有人能帮忙吗？内存不足错误

这是我的代码：

Session session = HibernateSessionFactory.getSession();
for(int i=0;i<serviceIds.length;i=i++)
{
EntityClass ec = new EntityClass
(Integer.parseInt(serviceIds[i]),0,someId3, 0,1,id2,
new Timestamp(System.currentTimeMillis()), 0,
null, null, 0, null,null,null,null);
session.save(ec);
}
session.flush();
session.clear();

这是我的实体类：

public class EntityClass implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private Integer id;
private Integer someId1;
private Integer someId2;
private Integer someId3;
private Integer flag1;
private Integer flag2;
private Integer createdBy;
private Timestamp createdDate;
private Integer modifiedBy;
private Timestamp modifiedDate;
private Timestamp endDate;
private Integer attribute1;
private String attribute2;
private String attribute3;
private String attribute4;
private String attribute5;
//full constructor
public EntityClass(Integer someId1, Integer someId2,
Integer someId3, Integer funBlockFlag, Integer functionalFlag,
Integer createdBy, Timestamp createdDate, Integer modifiedBy,
Timestamp modifiedDate, Timestamp endDate, Integer attribute1,
String attribute2, String attribute3, String attribute4,
String attribute5) {
this.someId1= someId1;
this.someId2 = someId2;
this.someId3 = someId3;
this.funBlockFlag = funBlockFlag;
this.functionalFlag = functionalFlag;
this.createdBy = createdBy;
this.createdDate = createdDate;
this.modifiedBy = modifiedBy;
this.modifiedDate = modifiedDate;
this.endDate = endDate;
this.attribute1 = attribute1;
this.attribute2 = attribute2;
this.attribute3 = attribute3;
this.attribute4 = attribute4;
this.attribute5 = attribute5;
}
//getter and setters of all fields

有人能帮我解决这个问题吗？

Answer 1

当我们持久化一个实体(在本例中为EntityClass(时，Hibernate将把它存储在持久化上下文中。

从您的案例来看，serviceId的长度可能太大，因为您为JVM设置了内存。

也许尝试刷新并清除每N个元素的持久性上下文。例如，假设你的BATCH_SIZE是20

private static final BATCH_SIZE = 20; // declare at class level
Session session = HibernateSessionFactory.getSession();
for(int i=0;i<serviceIds.length;i=i++)
{
EntityClass ec = new EntityClass
(Integer.parseInt(serviceIds[i]),0,someId3, 0,1,id2,
new Timestamp(System.currentTimeMillis()), 0,
null, null, 0, null,null,null,null);
session.save(ec);
if (i % BATCH_SIZE == 0) {
session.flush();
session.clear();
}
}
session.flush();
session.clear();