nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60000, active

os: ubuntu 16.03
db: postgresql 9.6.8

应用连接数据库报错

2019-07-29 08:40:51,445 946379015 [http-node1] ERROR BaseController  [xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx] - got a Exception
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:

Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60000, active 0, maxActive 20, creating 1
        at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
        at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82)
        at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68)
        at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336)
        at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84)
        at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
        at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
        at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
        at sun.reflect.GeneratedMethodAccessor277.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)
        at com.sun.proxy.$Proxy220.query(Unknown Source)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
        ... 91 common frames omitted
Caused by: com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60000, active 0, maxActive 20, creating 1
        at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1510)
        at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1255)
        at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5007)
        at com.alibaba.druid.filter.logging.LogFilter.dataSource_getConnection(LogFilter.java:876)
        at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5003)
        at com.alibaba.druid.filter.stat.StatFilter.dataSource_getConnection(StatFilter.java:680)
        at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5003)
        at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1233)
        at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1225)
        at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:90)
        at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
        at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
        ... 106 common frames omitted
Caused by: org.postgresql.util.PSQLException: FATAL: the database system is shutting down
        at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:443)
        at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:217)
        at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:51)
        at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:215)
        at org.postgresql.Driver.makeConnection(Driver.java:404)
        at org.postgresql.Driver.connect(Driver.java:272)
        at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)
        at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:786)
        at com.alibaba.druid.filter.FilterEventAdapter.connection_connect(FilterEventAdapter.java:38)
        at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
        at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
        at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
        at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1560)
        at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1623)
        at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2468)
		
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开发重启了应用,是能够正常创建到数据库的连接.

排查

应用使用的 jdbc 是 postgresql-9.4.1212.jre7.jar ,下载源码 postgresql-jdbc-9.4.1212.src.tar.gz
查看 ConnectionFactoryImpl.java
doAuthentication 方法

		  case 'E':
            // An error occurred, so pass the error message to the
            // user.
            //
            // The most common one to be thrown here is:
            // "User authentication failed"
            //
            int l_elen = pgStream.receiveInteger4();
            if (l_elen > 30000) {
              // if the error length is > than 30000 we assume this is really a v2 protocol
              // server, so trigger fallback.
              throw new UnsupportedProtocolException();
            }

            ServerErrorMessage errorMsg =
                new ServerErrorMessage(pgStream.receiveErrorString(l_elen - 4), logger.getLogLevel());
            if (logger.logDebug()) {
              logger.debug(" <=BE ErrorMessage(" + errorMsg + ")");
            }
            throw new PSQLException(errorMsg);
			
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openConnectionImpl 方法

        // Do authentication (until AuthenticationOk).
        doAuthentication(newStream, hostSpec.getHost(), user, info, logger);
		
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没有分析出有用的信息.

困惑的是: 连接池在 creating 时居然提示 FATAL: the database system is shutting down,但事实上 postgresql 正常运行,没有任何问题.
否则也不会重启就正常了.

参考:
https://jdbc.postgresql.org/download.html