[英]Too many connection already
我正在使用hibernate連接到遠程postgres(版本9.0)數據庫。 我得到以下錯誤
2011-03-08 06:48:25,695 ERROR [org.hibernate.util.JDBCExceptionReporter] (http-69.89.2.245-8080-9) FATAL: sorry, too many clients already 2011-03-08 06:48:25,695 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/JBOSSINI].[com.java.misc.feedback]] (http-69.89.2.245-8080-9) Servlet.service() for servlet com.java.misc.feedback threw exception: java.lang.NullPointerException at com.java.model.HiberEx.InsertsimpleReport(HiberEx.java:95) [:] at com.java.misc.feedback.doGet(feedback.java:87) [:] at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) [:1.0.0.Final] at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.0.0.Final] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.0.0.Final] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.0.0.Final] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) [:6.0.0.Final] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.0.0.Final] at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final] at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.0.0.Final] at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.0.0.Final] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) [:6.0.0.Final] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.0.0.Final] at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.0.0.Final] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.0.0.Final] at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.0.0.Final] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.0.0.Final] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.0.0.Final] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.0.0.Final] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.0.0.Final] at java.lang.Thread.run(Thread.java:619) [:1.6.0_21]
這是我的代碼
public void InsertfailReport(String destination, String source, String status, String timedate, String smsc, String failreason, String smsid, String message){ SessionFactory sessionFactory = new Configuration().configure("com/java/hibernate.cfg.xml").buildSessionFactory(); Session session = sessionFactory.openSession(); Transaction transaction = null; try { transaction = session.beginTransaction(); Failreport sobj=new Failreport(); sobj.setDestination(destination); sobj.setFailreason(failreason); sobj.setMessage(message); sobj.setSmsc(smsc); sobj.setSmsid(smsid); sobj.setSource(source); sobj.setStatus(status); sobj.setTimedate(timedate); session.save(sobj); transaction.commit(); } catch (HibernateException e) { transaction.rollback(); e.printStackTrace(); } finally { session.close(); } }
的hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory name="MyFactory"> <property name="hibernate.connection.driver_class">org.postgresql.Driver</property> <property name="hibernate.connection.password">xxxx</property> <property name="hibernate.connection.url">jdbc:postgresql://xx.xx.xx.xx:5432/smslog</property> <property name="hibernate.connection.username">xxxxx</property> <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property> <property name="hibernate.validator.apply_to_ddl">false</property> <property name="hibernate.validator.autoregister_listeners">false</property> <property name="hibernate.show_sql">true</property> <property name="hibernate.jdbc.batch_size">0</property> <mapping resource="com/java/model/Kannel.hbm.xml"/> <mapping resource="com/java/model/Smsc.hbm.xml"/> <mapping resource="com/java/model/Dlr.hbm.xml"/> <mapping resource="com/java/model/Routesmsc.hbm.xml"/> <mapping resource="com/java/model/Simplereport.hbm.xml"/> <mapping resource="com/java/model/Failreport.hbm.xml"/> </session-factory> </hibernate-configuration>
您超過了為PostgreSQL服務器配置的最大連接數。
因此,要么您的服務器配置不正確,要么連接不夠,要么您沒有正確關閉連接。
如果您完全確定要關閉連接,我強烈建議您使用連接池來限制最大並發會話數。
或者,您可以更改PostgreSQL配置並增加允許的連接數。 有關詳細信息,請參閱手冊
您正在方法調用中創建一個新的會話工廠,這幾乎肯定是一個壞主意 - 會話工廠應該被視為全局共享資源,就像數據源一樣。 更不用說,創建一個會話工廠需要相當長的時間。
由於您沒有關閉會話工廠,因此在會話工廠本身為GC之前,實際上不會清除其內部連接池。 通常,您在應用程序啟動/關閉期間創建和關閉會話工廠(例如,InitializingBean / DisposableBean,ServletContextEventListener,ServiceMBean)
增加max_connection和shared_buffers
在/var/lib/pgsql/data/postgresql.conf
更改
max_connections = 100
shared_buffers = 24MB
至
max_connections = 300
shared_buffers = 80MB
並重新啟動PostgreSQL數據庫。
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