Hibernate testConnectionOnCheckout не тестирует соединение - PullRequest
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Hibernate testConnectionOnCheckout не тестирует соединение

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/ 11 января 2019

У меня включено тестирование соединения в свойствах hibernate c3p0, но даже после этого я сталкиваюсь с проблемой соединения.

Вот моя конфигурация соединения: 

hibernate.connection.url = "jdbc:mysql://abc.eu-west-1.rds.amazonaws.com:3306/abc";
hibernate.dialect = "org.hibernate.dialect.MySQLDialect";
hibernate.cache.provider_class = "org.hibernate.cache.NoCacheProvider";
hibernate.hbm2ddl.auto = "update";
hibernate.show_sql = "false";
hibernate.connection.provider_class = "org.hibernate.c3p0.internal.C3P0ConnectionProvider";
hibernate.c3p0.min_size = "50";
hibernate.c3p0.max_size = "50";
hibernate.c3p0.idle_test_period = "100";
hibernate.c3p0.max_statements = "0";
hibernate.c3p0.timeout = "43200";
hibernate.c3p0.preferredTestQuery = "select 1";
hibernate.c3p0.testConnectionOnCheckout = "true";

Несмотря на то, что я включил hibernate.c3p0.testConnectionOnCheckout, я получаю сообщение об ошибке: 

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 48,002,613 milliseconds ago.  The last packet sent successfully to the server was 48,002,615 milliseconds ago. is longer than the server con
figured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnec
t=true' to avoid this problem.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_192]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_192]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_192]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_192]
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:377) ~[mysql-connector-java-bin.jar:5.1.33]
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036) ~[mysql-connector-java-bin.jar:5.1.33]
        at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3661) ~[mysql-connector-java-bin.jar:5.1.33]
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2417) ~[mysql-connector-java-bin.jar:5.1.33]
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582) ~[mysql-connector-java-bin.jar:5.1.33]
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2526) ~[mysql-connector-java-bin.jar:5.1.33]
        at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4842) ~[mysql-connector-java-bin.jar:5.1.33]
        at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:1059) ~[c3p0-0.9.5.1.jar:0.9.5.1]
        at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.begin(AbstractLogicalConnectionImplementor.java:67) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
        at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.begin(LogicalConnectionManagedImpl.java:235) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
        at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.begin(JdbcResourceLocalTransactionCoordinatorImpl.java:214) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
        at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:52) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
        at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1525) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
        at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:45) ~[hibernate-entitymanager-5.1.0.Final.jar:5.1.0.Final]
        at com.google.inject.persist.jpa.JpaLocalTxnInterceptor.invoke(JpaLocalTxnInterceptor.java:66) ~[guice-persist-4.0.jar:?]
        at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:77) ~[guice-4.0.jar:?]
        ...

Не должен ли testConnectionOnCheckout проверить соединение перед выполнением какого-либо запроса и предотвратить подобные ошибки? Если нет, что я должен сделать, чтобы исправить эту ошибку?

...