org.postgresql.util.PSQLException：致命：剩余的连接槽保留给非复制超级用户连接

Question

我正在使用 Postgresql 9.6 在 Spring 4.1 ,Tomcat 8.5.30 上开发一个应用程序，我定期在尝试访问数据库时收到此错误消息，或者当我运行 maven 先后安装了两次 :

AVERTISSEMENT [http-nio-9000-exec-36] 
org.apache.naming.NamingContext.lookup Une erreur s est produite durant 
la résolution de la référence
org.postgresql.util.PSQLException: FATAL: remaining connection slots are 
reserved for non-replication superuser connections
at org.postgresql.core.v3.ConnectionFactoryImpl.readStartupMessages(ConnectionFactoryImpl.java:691)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:207)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:65)
at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:156)
at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:35)
at org.postgresql.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:22)
at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:47)
at org.postgresql.jdbc42.AbstractJdbc42Connection.<init>(AbstractJdbc42Connection.java:21)
at org.postgresql.jdbc42.Jdbc42Connection.<init>(Jdbc42Connection.java:28)
at org.postgresql.Driver.makeConnection(Driver.java:415)
at org.postgresql.Driver.connect(Driver.java:282)
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:319)
at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:212)
at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:736)
at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:668)
at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:483)
at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:154)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:107)
at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:560)
at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:244)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
at org.apache.naming.NamingContext.lookup(NamingContext.java:839)
at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
at org.apache.naming.NamingContext.lookup(NamingContext.java:827)
at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
at org.apache.naming.NamingContext.lookup(NamingContext.java:827)
at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
at org.apache.naming.NamingContext.lookup(NamingContext.java:827)
at org.apache.naming.NamingContext.lookup(NamingContext.java:173)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:163)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at org.springframework.jndi.JndiTemplate.doInContext(JndiTemplate.java:155)
at org.springframework.jndi.JndiTemplate.execute(JndiTemplate.java:87)
at org.springframework.jndi.JndiTemplate.lookup(JndiTemplate.java:152)
at org.springframework.jndi.JndiTemplate.lookup(JndiTemplate.java:179)
at org.springframework.jndi.JndiLocatorSupport.lookup(JndiLocatorSupport.java:95)

...

我实际上尝试实现 Tomcat org.apache.tomcat.jdbc.pool.DataSourceFactory 的连接池，但我仍然遇到问题。

Context.xml的一部分：

  <Resource  name="jdbc/newmf01DataSource" 
          auth="Container" 
          type="javax.sql.DataSource"
         username="xx"
         password="xx" 
         driverClassName="org.postgresql.Driver"
         factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
         jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;
                            org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer(trace=true);
                            org.apache.tomcat.jdbc.pool.interceptor.SlowQueryReport(threshold=1000,maxQueries=10000);
                            org.apache.tomcat.jdbc.pool.interceptor.SlowQueryReportJmx(notifyPool=false,objectName=tomcat.jdbc:type=org.apache.tomcat.jdbc.pool.interceptor.SlowQueryReportJmx,name=jdbc/newmf01DataSource)"
        url="jdbc:postgresql://dvdsi975.rouen.francetelecom.fr:5432/pnmf02"
        validationQuery="SELECT 1"
         testWhileIdle="true"
         testOnBorrow="true"
         testOnReturn="false"

        maxIdle="20" 
        maxActive="70" 
        minIdle="10" 
        initialSize="10" 
        logAbandoned="true" 
        removeAbandonedTimeout="60" 
        removeAbandoned="true"
        minEvictableIdleTimeMillis="30000" 
        jmxEnabled="true" 
        useNaming="false"
        maxWait ="10000"
        />

有人以前看过这个或者请帮我指出正确的方向吗？

Answer 1

我检查了有多少个打开的连接：SELECT * FROM pg_stat_activity;我发现很多 Idl 连接，每次我运行安装时，这个数字都会增加并超过 postgresql 的 "max-connection= 100"。所以我通过修改 minIdle="10" -> "0"

解决了这个问题

org.postgresql.util.PSQLException：致命：剩余的连接槽保留给非复制超级用户连接

org.postgresql.util.PSQLException: FATAL: remaining connection slots are reserved for non-replication superuser connections

java

connection-pooling

postgresql-9.6

tomcat8.5