飞路jdbc迁移连接麻烦

Question

我在Flyway JDBC迁移方面遇到了麻烦：在执行所有语句之后，我正在尝试使用conn.close();方法关闭数据库连接，并且我收到org.postgresql.util.PSQLException: This connection has been closed.异常。当我检查我的数据库时 - 我在迁移中所做的所有更改都已完成，但schema_version表未更新：未添加有关迁移的项目。 更多细节在这里： 在flyway.properties中，我将classpath:com/packageone/somepackege/database/migration添加到flyway.locations部分。然后我创建了一个将执行迁移的类：public class V1_1_1__SomeImportantMigration implements JdbcMigration并填充migrate方法，如下所示：

 @Override
        public void migrate( Connection conn ) throws Exception {
            beforeActions( conn );
            veryImportantMigration( conn, getData( conn ) );
            afterActions( conn );
            conn.close();
        }

应用在migrate方法中完成的事情，但关闭连接会导致异常。 由于上述信息，我有这样的疑问：为什么这个连接在关闭之前就关闭了？什么？

UPDATE（堆栈跟踪）：

    [ERROR] Unable to rollback transaction
org.postgresql.util.PSQLException: This connection has been closed.
    at org.postgresql.jdbc2.AbstractJdbc2Connection.checkClosed(AbstractJdbc2Connection.java:820)
    at org.postgresql.jdbc2.AbstractJdbc2Connection.rollback(AbstractJdbc2Connection.java:837)
    at org.flywaydb.core.internal.util.jdbc.TransactionTemplate.execute(TransactionTemplate.java:96)
    at org.flywaydb.core.internal.command.DbMigrate.applyMigrations(DbMigrate.java:273)
    at org.flywaydb.core.internal.command.DbMigrate.access$800(DbMigrate.java:53)
    at org.flywaydb.core.internal.command.DbMigrate$2.call(DbMigrate.java:210)
    at org.flywaydb.core.internal.command.DbMigrate$2.call(DbMigrate.java:146)
    at org.flywaydb.core.internal.dbsupport.postgresql.PostgreSQLAdvisoryLockTemplate.execute(PostgreSQLAdvisoryLockTemplate.java:68)
    at org.flywaydb.core.internal.dbsupport.postgresql.PostgreSQLDbSupport.lock(PostgreSQLDbSupport.java:162)
    at org.flywaydb.core.internal.metadatatable.MetaDataTableImpl.lock(MetaDataTableImpl.java:174)
    at org.flywaydb.core.internal.command.DbMigrate.migrate(DbMigrate.java:146)
    at org.flywaydb.core.Flyway$1.execute(Flyway.java:1010)
    at org.flywaydb.core.Flyway$1.execute(Flyway.java:971)
    at org.flywaydb.core.Flyway.execute(Flyway.java:1464)
    at org.flywaydb.core.Flyway.migrate(Flyway.java:971)
    at org.flywaydb.maven.MigrateMojo.doExecute(MigrateMojo.java:30)
    at org.flywaydb.maven.AbstractFlywayMojo.execute(AbstractFlywayMojo.java:600)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
[ERROR] Unable to restore autocommit to original value for connection
org.postgresql.util.PSQLException: This connection has been closed.
    at org.postgresql.jdbc2.AbstractJdbc2Connection.checkClosed(AbstractJdbc2Connection.java:820)
    at org.postgresql.jdbc2.AbstractJdbc2Connection.setAutoCommit(AbstractJdbc2Connection.java:762)
    at org.flywaydb.core.internal.util.jdbc.TransactionTemplate.execute(TransactionTemplate.java:114)
    at org.flywaydb.core.internal.command.DbMigrate.applyMigrations(DbMigrate.java:273)
    at org.flywaydb.core.internal.command.DbMigrate.access$800(DbMigrate.java:53)
    at org.flywaydb.core.internal.command.DbMigrate$2.call(DbMigrate.java:210)
    at org.flywaydb.core.internal.command.DbMigrate$2.call(DbMigrate.java:146)
    at org.flywaydb.core.internal.dbsupport.postgresql.PostgreSQLAdvisoryLockTemplate.execute(PostgreSQLAdvisoryLockTemplate.java:68)
    at org.flywaydb.core.internal.dbsupport.postgresql.PostgreSQLDbSupport.lock(PostgreSQLDbSupport.java:162)
    at org.flywaydb.core.internal.metadatatable.MetaDataTableImpl.lock(MetaDataTableImpl.java:174)
    at org.flywaydb.core.internal.command.DbMigrate.migrate(DbMigrate.java:146)
    at org.flywaydb.core.Flyway$1.execute(Flyway.java:1010)
    at org.flywaydb.core.Flyway$1.execute(Flyway.java:971)
    at org.flywaydb.core.Flyway.execute(Flyway.java:1464)
    at org.flywaydb.core.Flyway.migrate(Flyway.java:971)
    at org.flywaydb.maven.MigrateMojo.doExecute(MigrateMojo.java:30)
    at org.flywaydb.maven.AbstractFlywayMojo.execute(AbstractFlywayMojo.java:600)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
[ERROR] Unable to release Flyway advisory lock
org.postgresql.util.PSQLException: This connection has been closed.
    at org.postgresql.jdbc2.AbstractJdbc2Connection.checkClosed(AbstractJdbc2Connection.java:820)
    at org.postgresql.jdbc3.AbstractJdbc3Connection.prepareStatement(AbstractJdbc3Connection.java:275)
    at org.postgresql.jdbc2.AbstractJdbc2Connection.prepareStatement(AbstractJdbc2Connection.java:293)
    at org.flywaydb.core.internal.dbsupport.JdbcTemplate.prepareStatement(JdbcTemplate.java:319)
    at org.flywaydb.core.internal.dbsupport.JdbcTemplate.execute(JdbcTemplate.java:247)
    at org.flywaydb.core.internal.dbsupport.postgresql.PostgreSQLAdvisoryLockTemplate.execute(PostgreSQLAdvisoryLockTemplate.java:81)
    at org.flywaydb.core.internal.dbsupport.postgresql.PostgreSQLDbSupport.lock(PostgreSQLDbSupport.java:162)
    at org.flywaydb.core.internal.metadatatable.MetaDataTableImpl.lock(MetaDataTableImpl.java:174)
    at org.flywaydb.core.internal.command.DbMigrate.migrate(DbMigrate.java:146)
    at org.flywaydb.core.Flyway$1.execute(Flyway.java:1010)
    at org.flywaydb.core.Flyway$1.execute(Flyway.java:971)
    at org.flywaydb.core.Flyway.execute(Flyway.java:1464)
    at org.flywaydb.core.Flyway.migrate(Flyway.java:971)
    at org.flywaydb.maven.MigrateMojo.doExecute(MigrateMojo.java:30)
    at org.flywaydb.maven.AbstractFlywayMojo.execute(AbstractFlywayMojo.java:600)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

Answer 1

你不应该在Flyway提供给你的连接上打电话给close()。 Flyway将此连接本身用于其他内务处理任务（包括更新版本表），关闭它可防止flyway正常工作。