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嗨，我是 Web 开发的新手，正在尝试让 activejdbc 连接到云 sql 实例...我得到以下堆栈跟踪：

    [ERROR] Failed to execute goal org.javalite:db-migrator-maven-plugin:1.4.11:migrate (dev_migrations) on project activeweb-simple: Execution dev_migrations of go
al org.javalite:db-migrator-maven-plugin:1.4.11:migrate failed: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create socket fa
ctory 'com.google.cloud.sql.mysql.SocketFactory' due to underlying exception:  -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.javalite:db-migrator-maven-plugin:1.4.11:migrate (dev_migrations) on project
activeweb-simple: Execution dev_migrations of goal org.javalite:db-migrator-maven-plugin:1.4.11:migrate failed: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransien
tConnectionException: Could not create socket factory 'com.google.cloud.sql.mysql.SocketFactory' due to underlying exception:
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
        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:309)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:194)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:107)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:993)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:191)
        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)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution dev_migrations of goal org.javalite:db-migrator-maven-plugin:1.4.11:migrate failed: com.m
ysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create socket factory 'com.google.cloud.sql.mysql.SocketFactory' due to underlying ex
ception:
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
        ... 20 more
Caused by: org.javalite.db_migrator.MigrationException: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create socket factory 'c
om.google.cloud.sql.mysql.SocketFactory' due to underlying exception:
        at org.javalite.db_migrator.DbUtils.openConnection(DbUtils.java:183)
        at org.javalite.db_migrator.maven.AbstractDbMigrationMojo.openConnection(AbstractDbMigrationMojo.java:178)
        at org.javalite.db_migrator.maven.AbstractDbMigrationMojo.openConnection(AbstractDbMigrationMojo.java:170)
        at org.javalite.db_migrator.maven.MigrateMojo.executeMojo(MigrateMojo.java:21)
        at org.javalite.db_migrator.maven.AbstractDbMigrationMojo.executeCurrentConfiguration(AbstractDbMigrationMojo.java:96)
        at org.javalite.db_migrator.maven.AbstractDbMigrationMojo.execute(AbstractDbMigrationMojo.java:80)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
        ... 21 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create socket factory 'com.google.cloud.sql.mysql.SocketFactory' due
to underlying exception:
        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:377)
        at com.mysql.jdbc.Util.getInstance(Util.java:360)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)
        at com.mysql.jdbc.MysqlIO.createSocketFactory(MysqlIO.java:3194)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:293)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2232)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2265)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
        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:377)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:395)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
        at java.sql.DriverManager.getConnection(DriverManager.java:664)
        at java.sql.DriverManager.getConnection(DriverManager.java:247)
        at org.javalite.db_migrator.DbUtils.openConnection(DbUtils.java:181)
        ... 27 more
Caused by: java.lang.ClassNotFoundException: com.google.cloud.sql.mysql.SocketFactory
        at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
        at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
        at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
        at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:264)
        at com.mysql.jdbc.MysqlIO.createSocketFactory(MysqlIO.java:3192)
    ... 43 more

我在 database.properties 中的连接字符串如下所示：

development.url=jdbc:mysql://google/database?cloudSqlInstance=project:location:instance&socketFactory=com.google.cloud.sql.mysql.SocketFactory&user=dbuser&password=dbuserpassword&useSSL=false

我在 spring-hibernate 配置中使用了相同的连接字符串，没有问题，但想尝试 activeweb-activejdbc。为什么编译器找不到类？我在 pom.xml 中包含了 google cloud sql 依赖项：

    <dependency>
        <groupId>com.google.cloud.sql</groupId>
        <artifactId>mysql-socket-factory-connector-j-6</artifactId>
        <version>1.0.2</version>
    </dependency>
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1 回答 1

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首先，您需要包含一个填充堆栈跟踪。其次，如果你得到一个ClassNotFoundException，这意味着你在类路径上没有那个类。您需要知道该课程在那里的事实。使用 Maven 依赖插件，或者扩展所有依赖的 jar 文件并确保你有这个类。这里没有魔法:)

更新：现在您提供了堆栈跟踪，我看到在您运行迁移器时发生了异常。如果您查看迁移器配置，您会发现它需要自己的类路径。例如，这里的示例：https ://github.com/javalite/activeweb-simple/blob/master/pom.xml#L39列出了 MySQL JDBC 驱动程序，特别是针对迁移器，即使您已经为项目配置了它运行。只需复制配置，然后用您的驱动程序替换 MySQL 驱动程序。

于 2017-06-11T15:55:50.407 回答