瑙ｅ喅鍔炴硶錛?br />閲嶆柊鐢熸垚serialVersionUDI銆?img src ="http://www.aygfsteel.com/anchor110/aggbug/403538.html" width = "1" height = "1" />
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org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.surfront.meepao.pojo.GamePlayer.score; nested exception is javax.persistence.PersistenceException:
鍘熷洜濡備笅錛?br />鍦╬ojo綾籊amePlayer涓紝鏌恑nt綾誨瀷鐨勫瓧孌祍core錛屽湪鏁版嵁搴撲腑鐨勬暟鎹負null銆?br />
瑙ｅ喅鍔炴硶錛?br />淇敼int涓哄叾鍖呰綾誨瀷Integer銆?img src ="http://www.aygfsteel.com/anchor110/aggbug/360353.html" width = "1" height = "1" />
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鐢╦pa錛坔ibernate瀹炵幇錛夊仛搴旂敤鏃訛紝紼嬪簭涓姤浠ヤ笅閿欒錛?br /> com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:
The last packet successfully received from the server was 79,221,885 milliseconds ago.
The last packet sent successfully to the server was 79,221,885 milliseconds ago.
is longer than the server configured value of 'wait_timeout'.
You should consider either expiring and/or testing connection validity before use in your application,
increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
瑙ｉ噴鍙婅В鍐沖姙娉曪細
濡傛灉榪炴帴闂茬疆8灝忔椂 (8灝忔椂鍐呮病鏈夎繘琛屾暟鎹簱鎿嶄綔), mysql灝變細鑷姩鏂紑榪炴帴, 寰楀埛鏂板簲鐢ㄦ墠琛?
涓嶇敤hibernate鐨勮瘽, connection url鍔犲弬鏁? autoReconnect=true
鐢╤ibernate鐨勮瘽, 鍔犲涓嬪睘鎬?
<property name="connection.autoReconnect">true</property>
<property name="connection.autoReconnectForPools">true</property>
<property name="connection.is-connection-validation-required">true</property>
瑕佹槸榪樼敤c3p0榪炴帴姹?
<property name="hibernate.c3p0.acquire_increment">1</property>
<property name="hibernate.c3p0.idle_test_period">0</property>
<property name="hibernate.c3p0.timeout">0</property>
<property name="hibernate.c3p0.validate">true</property>
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public class customerService{
@PersistenceContext(unitName="jpaUnit")//鏄痯ersistence.xml涓厤緗殑<persistence-unit>涓殑name鍊?/p>
private EntityManager entityManager;
public List<CustomerEO> findAllCustomers()
{
String jpql="select c from CustomerEO c";
Query query=entityManager.createQuery(jpql);
query.setFirstResult(5);//璁劇疆鏌ヨ緇撴灉鐨勫紑濮嬭褰曟暟
query.setMaxResults(10);//璁炬煡璇㈢粨鏋滅殑緇撴潫璁板綍鏁?nbsp; 鏌ヨ璁板綍鏁?~~10鐨勬暟鎹?/p>
List<CustomerEO> result=query.getResultList();
return result;
}
}
]]>