Flyway 错误：无法在 Mac Sierra 10.13 上加载

Question

我使用brew安装了flyway，并且尝试为postgres运行迁移，但收到此错误：

Flyway 4.2.0 由 Boxfuse 提供

错误：无法加载 /usr/local/Cellar/flyway/4.2.0/libexec/drivers/postgresql-9.4.1208.jre6.jar

我已经检查了该路径并且目录和文件存在。

有什么建议 ？

Answer 1

这是 Flyway 4.x 的一个已知问题 ( 1545 )，已在版本 5.x 中解决

解决方案：安装5.x版本——我向Homebrew提交了一个pull request来更新公式

根本原因是ClassCastException与 Java 9 更改相关（问题 3）。

使用-Xflag 运行以查看真正的问题：

$ flyway info -X
Flyway 4.2.0 by Boxfuse

DEBUG: Java 9.0.1 (Oracle Corporation)
DEBUG: Mac OS X 10.13.1 x86_64

DEBUG: Loading config file: /usr/local/Cellar/flyway/4.2.0/libexec/conf/flyway.conf
DEBUG: Unable to load config file: /Users/sdc/flyway.conf
DEBUG: Loading config file: /Users/sdc/code/flytest/flyway.conf
DEBUG: Using configuration:
DEBUG: flyway.jarDirs -> /usr/local/Cellar/flyway/4.2.0/libexec/jars
DEBUG: flyway.driver -> com.mysql.jdbc.Driver
DEBUG: flyway.locations -> filesystem:/usr/local/Cellar/flyway/4.2.0/libexec/sql
DEBUG: flyway.url -> jdbc:mysql://localhost:3306/eddydb
DEBUG: flyway.user -> root
DEBUG: flyway.password -> *********
DEBUG: Adding location to classpath: /usr/local/Cellar/flyway/4.2.0/libexec/drivers/postgresql-9.4.1208.jre6.jar
ERROR: Unexpected error
org.flywaydb.core.api.FlywayException: Unable to load /usr/local/Cellar/flyway/4.2.0/libexec/drivers/postgresql-9.4.1208.jre6.jar
    at org.flywaydb.core.internal.util.ClassUtils.addJarOrDirectoryToClasspath(ClassUtils.java:156)
    at org.flywaydb.commandline.Main.loadJdbcDrivers(Main.java:305)
    at org.flywaydb.commandline.Main.main(Main.java:95)
Caused by: java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader
    at org.flywaydb.core.internal.util.ClassUtils.addJarOrDirectoryToClasspath(ClassUtils.java:151)
    ... 2 more