com.zaxxer.hikari.pool.PoolInitializationException: Ausnahme während Pool-Initialisierung

Question

Ich habe derzeit einen offenen Pool, der mit meiner Hauptdatenbank verbindet und es funktioniert perfekt. Aber jetzt möchte ich einen neuen Pool für eine andere Datenbank öffnen. Ich habe den neuen Pool GENAU eingerichtet, wie ich den ersten eingerichtet habe, offensichtlich habe ich den Datenbanknamen geändert usw. Es erscheinen keine Fehler, wenn ich meine setupHikari() Methode lade, aber sobald eine aktuelle Anweisung ausgeführt wird, bekomme ich viele Fehler.

Caused by: com.zaxxer.hikari.pool.PoolInitializationException: Exception during pool initialization at com.zaxxer.hikari.pool.HikariPool.initializeConnections(HikariPool.java:580) ~[?:?] at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:150) ~[?:?] at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:96) ~[?:?] at com.thecodexmc.GameLibrary.xenforo.XenUtils.getUserGroupID(XenUtils.java:51) ~[?:?] at com.thecodexmc.GameLibrary.game.GameListeners.onLogin(GameListeners.java:334) ~[?:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_79] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_79] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_79] at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] ... 13 more Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_79] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) ~[?:1.7.0_79] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.7.0_79] at java.lang.reflect.Constructor.newInstance(Constructor.java:526) ~[?:1.7.0_79] at com.mysql.jdbc.Util.handleNewInstance(Util.java:407) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.Util.getInstance(Util.java:382) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3593) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3525) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:931) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4031) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1296) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2338) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2371) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2163) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_79] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) ~[?:1.7.0_79] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.7.0_79] at java.lang.reflect.Constructor.newInstance(Constructor.java:526) ~[?:1.7.0_79] at com.mysql.jdbc.Util.handleNewInstance(Util.java:407) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:378) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:440) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:138) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:108) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] at com.zaxxer.hikari.pool.HikariPool.addConnection(HikariPool.java:495) ~[?:?] at com.zaxxer.hikari.pool.HikariPool.initializeConnections(HikariPool.java:564) ~[?:?] at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:150) ~[?:?] at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:96) ~[?:?] at com.thecodexmc.GameLibrary.xenforo.XenUtils.getUserGroupID(XenUtils.java:51) ~[?:?] at com.thecodexmc.GameLibrary.game.GameListeners.onLogin(GameListeners.java:334) ~[?:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_79] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_79] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_79] at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server.jar:git-PaperSpigot-7aa4900-62a2169] ... 13 more 

Was mache ich hier falsch? Hier ist meine XenSQL-Klasse, die das Problem verursacht.

public class XenSQL { 

private static XenSQL instance; 
private HikariDataSource hikari; 

public XenSQL() { 
    instance = this; 
} 

public void setupHikari() { 
    hikari = new HikariDataSource(); 
    hikari.setMaximumPoolSize(10); 
    hikari.setDataSourceClassName("com.mysql.jdbc.jdbc2.optional.MysqlDataSource"); 
    hikari.addDataSourceProperty("serverName", host); 
    hikari.addDataSourceProperty("port", port); 
    hikari.addDataSourceProperty("databaseName", database); 
    hikari.addDataSourceProperty("user", user); 
    hikari.addDataSourceProperty("password", password); 
    System.out.println("[XenSQL] HikariCP connected to the database successfully."); 
} 

public void queryUpdate(String query) { 
    Connection connection = null; 

    try { 
     connection = hikari.getConnection(); 
     PreparedStatement pre = connection.prepareStatement(query); 
     pre.executeUpdate(); 
     pre.close(); 
    } catch (SQLException e) { 
     System.out.println("[XenSQL] Error whilst executing the query \"" + query + "\": " + e.getMessage()); 
    } finally { 
     closeConnection(connection); 
    } 
} 

public void closeConnection(Connection connection) { 
    if(connection != null) { 
     try { 
      connection.close(); 
     } catch(SQLException e) { 
      e.printStackTrace(); 
     } 
    } 
} 

public HikariDataSource getHikari() { 
    return hikari; 
} 

public static XenSQL getInstance() { 
    return instance; 
} 
} 

Ich entfernte die SQL-Informationen aus offensichtlichen Gründen, aber ich weiß nicht, was das Problem hier ist.

Answer 1

Für MySQLNonTransientConnectionException: Zu viele Verbindungen

einige Optionen, die Sie haben, sind:

1. einige Verbindungen töten manuell
   SHOW PROCESS Verwenden Sie alle Verbindungen zu betrachten, dann KILL den Prozess-IDs Sie töten wollen.
2. Timeout-Einstellung bearbeiten, damit der MySQL-Daemon die inaktiven Prozesse selbst beendet
   ie. in meiner.cnf:
   wait_timeout = 28800 interactive_timeout = 28800
3. Erhöhen Sie die Anzahl der Verbindungen
   dh. im Abschnitt [mysqld] von my.cnf:
   max_connections = 100
4. Beschränken Sie die Anzahl der Verbindungen pro Benutzername
   dh. in [mysqld] -Abschnitt der my.cnf:
   max_user_connections = 50
5. Restart MySQL Server

HTH