我在休眠c3p0属性中启用了连接测试，但即使在此之后，我仍然面临连接问题。
这是我的连接配置：
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";
尽管启用了hibernate.c3p0.testConnectionOnCheckout，但出现错误：
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:?]
...
testConnectionOnCheckout是否应在执行任何查询之前测试连接并防止这种错误？
如果没有，我该怎么做才能纠正此错误？