我正在尝试使用kafka-jdbc-connector（源和接收器）和一个非常古老的数据库（cloudscape）。我有这个数据库的JDBC驱动程序。我将驱动程序放在Confluent（版本5）的“/ share / java / kafka / connect / jdbc”文件夹中，并创建了属性文件。
name=test-source-cloud-jdbc-autoincrement
connector.class=io.confluent.connect.jdbc.JdbcSourceConnector
tasks.max=1
connection.url=jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB
mode=incrementing
incrementing.column.name=id
topic.prefix=test-cloud-jdbc-
当我启动连接器时，日志是：
[2019-01-31 11:23:36,582] DEBUG Finding best dialect for JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:119)
[2019-01-31 11:23:36,582] DEBUG Dialect Db2DatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,582] DEBUG Dialect DerbyDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,582] DEBUG Dialect GenericDatabaseDialect scored 10 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,582] DEBUG Dialect MySqlDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,582] DEBUG Dialect OracleDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,582] DEBUG Dialect PostgreSqlDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,583] DEBUG Dialect SapHanaDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,583] DEBUG Dialect SqlServerDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,583] DEBUG Dialect SqliteDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,583] DEBUG Dialect SybaseDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,583] DEBUG Dialect VerticaDatabaseDialect scored 0 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:126)
[2019-01-31 11:23:36,583] DEBUG Using dialect GenericDatabaseDialect with score 10 against JDBC subprotocol 'cloudscape' and source 'jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB' (io.confluent.connect.jdbc.dialect.DatabaseDialects:132)
[2019-01-31 11:23:36,587] ERROR Failed to create job for ./etc/kafka-connect-jdbc/CloudscapeProperties.properties (org.apache.kafka.connect.cli.ConnectStandalone:102)
[2019-01-31 11:23:36,588] ERROR Stopping after connector error (org.apache.kafka.connect.cli.ConnectStandalone:113)
java.util.concurrent.ExecutionException: org.apache.kafka.connect.runtime.rest.errors.BadRequestException: Connector configuration is invalid and contains the following 2 error(s):
Invalid value java.sql.SQLException: No suitable driver found for jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB for configuration Couldn't open connection to jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB
Invalid value java.sql.SQLException: No suitable driver found for jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB for configuration Couldn't open connection to jdbc:cloudscape:rmi://localhost:1099/CloudscapeDB
You can also find the above list of errors at the endpoint `/{connectorType}/config/validate`
at org.apache.kafka.connect.util.ConvertingFutureCallback.result(ConvertingFutureCallback.java:79)
at org.apache.kafka.connect.util.ConvertingFutureCallback.get(ConvertingFutureCallback.java:66)
at org.apache.kafka.connect.cli.ConnectStandalone.main(ConnectStandalone.java:110)
我想有一个问题是JDBC驱动程序很老（它使用JAVA 1.3）。驱动程序使用RMI协议进行通信。如果我运行一个非常简单的JAVA RMI客户端来使用RmiJdbc.jar和cloudscape.jar（驱动程序）查询数据库，我只能查询数据库并获得结果。
您认为是与Java版本相关的问题吗？并且，它是否有意义/是否可以实现自定义Kafka驱动程序来读取此数据库中的数据？有关此问题的任何建议或如何为旧数据库实现自定义Kafka驱动程序？
我不会立即得出结论，驱动程序/数据库是旧的...
您不能将plugin.path直接指向JDBC驱动程序。
将plugin.path更新为顶级/path/to/confluent-x.y.z/usr/share/java的绝对路径，并将驱动程序复制到kafka-connect-jdbc文件夹中。
重新启动Connect，然后找到驱动程序。
您可以通过查找kafka/connect-log4j.properties和set来进一步调试
log4j.rootLogger=DEBUG, stdout
然后你会看到这样的日志（MySQL的例子）
[2019-01-15 09:45:26,949] DEBUG Registered java.sql.Driver: com.mysql.cj.jdbc.Driver@37303f12 to java.sql.DriverManager (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)