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  • Data source rejected establishment of connection, message from server: "Too many connections"

     出现这个错误,是因为连接数 大于 mysql的最大连接数,可通过修改配置文件来增大Mysql的最大连接数。

     1 com.mchange.v2.resourcepool.BasicResourcePool(line/:1841) -
     2 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@186e1f5a -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: 
     3 com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection,  message from server: "Too many connections"
     4     at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)
     5     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
     6     at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
     7     at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
     8     at com.mysql.jdbc.Util.getInstance(Util.java:386)
     9     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
    10     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
    11     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
    12     at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1136)
    13     at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2395)
    14     at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2428)
    15     at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2213)
    16     at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:797)
    17     at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    18     at sun.reflect.GeneratedConstructorAccessor13.newInstance(Unknown Source)
    19     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    20     at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    21     at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    22     at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)
    23     at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
    24     at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)
    25     at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
    26     at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
    27     at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
    28     at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
    29     at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
    30     at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
    31     at com.mchange.v2.async.ThreadPerTaskAsynchronousRunner$TaskThread.run(ThreadPerTaskAsynchronousRunner.java:255)
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  • 原文地址:https://www.cnblogs.com/xbq8080/p/7273670.html
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