我在应用程序中配置了两个数据源，每个数据源都连接到不同的数据库。
@Configuration
@EnableJpaRepositories(basePackages = "com.bancadati.*",
entityManagerFactoryRef = "entityManagerFactory", transactionManagerRef = "transactionManager")
public class BancaDatiDbConfig {
@Bean(name = "dataSource")
@Primary
public DataSource dataSource() {
try {
final Properties pool = new Properties();
pool.put("driverClassName", "com.mysql.jdbc.Driver");
pool.put("url", "jdbc:mysql://localhost:3306/bd");
pool.put("username", "xxx");
pool.put("password", "xxx");
pool.put("minIdle", 1);
pool.put("maxWait", 10000);
pool.put("testOnBorrow", true);
pool.put("validationQuery", "SELECT 1");
pool.put("autoReconnect", true);
return new org.apache.tomcat.jdbc.pool.DataSourceFactory().createDataSource(pool);
}catch (Exception e){
throw new RuntimeException("can't create mysql bancadati pool.");
}
}
@PersistenceContext(unitName = "bancadati")
@Primary
@Bean(name = "entityManagerFactory")
public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder) {
return builder.dataSource(dataSource())
.persistenceUnit("bancadati")
.packages("com.bancadati.*")
.build();
}
@Primary
@Bean(name = "transactionManager")
public PlatformTransactionManager transactionManager(EntityManagerFactoryBuilder builder) {
JpaTransactionManager tm = new JpaTransactionManager();
tm.setEntityManagerFactory(entityManagerFactory(builder).getObject());
tm.setDataSource(dataSource());
return tm;
}
}
和第二个。
@Configuration
@EnableJpaRepositories(
entityManagerFactoryRef = "fallmentiNewsEntityManager",
transactionManagerRef = "fallimentiNewsTransactionManager",
basePackages = "com.fallimentinews.*")
public class FallimentiNewsDbConfig {
@Bean(name = "fallimentiNewsDataSource")
public DataSource flnewsDataSource() {
try {
final Properties pool = new Properties();
pool.put("driverClassName", "com.mysql.jdbc.Driver");
pool.put("url", "jdbc:mysql://192.168.111.199:3306/flnews");
pool.put("username", "xxx");
pool.put("password", "xxx");
pool.put("minIdle", 1);
pool.put("testOnBorrow", true);
return new org.apache.tomcat.jdbc.pool.DataSourceFactory().createDataSource(pool);
}catch (Exception e){
throw new RuntimeException("Impossibile creare mysql pool per fallimentinews.");
}
}
@PersistenceContext(unitName = "fallimentinews")
@Bean(name = "fallmentiNewsEntityManager")
public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder) {
return builder.dataSource(flnewsDataSource())
.persistenceUnit("fallimentinews")
.packages("com.fallimentinews.*")
.build();
}
@Bean(name = "fallimentiNewsTransactionManager")
public PlatformTransactionManager transactionManager(EntityManagerFactoryBuilder builder) {
JpaTransactionManager tm = new JpaTransactionManager();
tm.setEntityManagerFactory(entityManagerFactory(builder).getObject());
tm.setDataSource(flnewsDataSource());
return tm;
}
}
它是随机发生的，由于某种原因，mysql连接关闭并且应用程序无法再重新连接到db，从而收到此错误：
[EL Finer]: connection: ServerSession(663238966)--client acquired: 894375198
[EL Finer]: transaction: ClientSession(894375198)--acquire unit of work: 120676294
[EL Finest]: connection: ServerSession(663238966)--Connection(940365957)--Connection acquired from connection pool [read].
[EL Finest]: connection: ServerSession(663238966)--reconnecting to external connection pool
[EL Fine]: sql: ServerSession(663238966)--Connection(267520764)--SELECT id, label, slug, view, visible, price_list_id FROM action WHERE (slug = ?)
bind => [add-task]
[EL Fine]: sql: ServerSession(663238966)--SELECT 1
[EL Finest]: connection: ServerSession(663238966)--Connection(940365957)--Connection released to connection pool [read].
[EL Info]: query: UnitOfWork(120676294)--Communication failure detected when attempting to perform read query outside of a transaction. Attempting to retry query. Error was: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.7.1.v20171221-bd47e8f): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
Error Code: 0
为什么应用程序无法重新连接到数据库？有任何想法吗？我可以重现停止和重新启动mysql服务的问题。 谢谢。
在堆栈跟踪下方：
Call: SELECT id, label, slug, view, visible, price_list_id FROM action WHERE (slug = ?)
bind => [add-task]
Query: ReadAllQuery(referenceClass=Action sql="SELECT id, label, slug, view, visible, price_list_id FROM action WHERE (slug = ?)")
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:340)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.processExceptionForCommError(DatabaseAccessor.java:1645)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:680)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:564)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:2093)
at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:600)
at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:261)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:270)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:256)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:327)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:722)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2740)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2693)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:563)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1221)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:911)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1180)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:464)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1268)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2979)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1892)
at org.eclipse.persistence.internal.sessions.AbstractSession.retryQuery(AbstractSession.java:1963)
at org.eclipse.persistence.sessions.server.ClientSession.retryQuery(ClientSession.java:702)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.retryQuery(UnitOfWorkImpl.java:5660)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1929)
at org.eclipse.persistence.internal.sessions.AbstractSession.retryQuery(AbstractSession.java:1963)
at org.eclipse.persistence.sessions.server.ClientSession.retryQuery(ClientSession.java:702)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.retryQuery(UnitOfWorkImpl.java:5660)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1929)
at org.eclipse.persistence.internal.sessions.AbstractSession.retryQuery(AbstractSession.java:1963)
at org.eclipse.persistence.sessions.server.ClientSession.retryQuery(ClientSession.java:702)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.retryQuery(UnitOfWorkImpl.java:5660)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1929)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1874)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1839)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:260)
... 45 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
at sun.reflect.GeneratedConstructorAccessor904.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:918)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1187)
at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1182)
at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4071)
at com.mysql.jdbc.ConnectionImpl.prepareStatement(ConnectionImpl.java:4040)
at sun.reflect.GeneratedMethodAccessor148.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108)
at org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor.invoke(AbstractCreateStatementInterceptor.java:75)
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108)
at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:81)
at com.sun.proxy.$Proxy1506.prepareStatement(Unknown Source)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.prepareStatement(DatabaseAccessor.java:1590)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.prepareStatement(DatabaseAccessor.java:1539)
at org.eclipse.persistence.internal.databaseaccess.DatabaseCall.prepareStatement(DatabaseCall.java:804)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:625)
... 78 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Server shutdown in progress
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:918)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2487)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1966)
at sun.reflect.GeneratedMethodAccessor149.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.jdbc.pool.StatementFacade$StatementProxy.invoke(StatementFacade.java:114)
at com.sun.proxy.$Proxy1569.executeQuery(Unknown Source)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeSelect(DatabaseAccessor.java:1012)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:648)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:564)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:2093)
at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:600)
at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:261)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:270)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:256)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:327)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:722)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2740)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2693)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:563)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1221)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:911)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1180)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:464)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1268)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2979)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1892)
... 48 more