com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"

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Root Cause Analysis

  1. com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException

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

    at sun.reflect.GeneratedConstructorAccessor2543.newInstance()
  2. Java RT
    Constructor.newInstance
    1. sun.reflect.GeneratedConstructorAccessor2543.newInstance(Unknown Source)
    2. sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    3. java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    3 frames
  3. MySQL jdbc
    ConnectionImpl.connectWithRetries
    1. com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    2. com.mysql.jdbc.Util.getInstance(Util.java:386)
    3. com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1014)
    4. com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
    5. com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
    6. com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1104)
    7. com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2412)
    8. com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2253)
    8 frames