Gradle 和 Flyway：无法获取资源的输入流

Question

我遇到在 Gradle 项目中使用 Flyway 进行 migrateDb 有时会导致的问题

Unable to obtain inputstream for resource: META-INF/db/mysql/V1__script.sql

此错误不会一直发生，而只是有时发生，但如果发生，它会非常持久，而且项目的清理/重建也无法解决它。

提到的 SQL 脚本包含在一个 JAR 文件中，该文件作为多模块项目的一部分从项目中引用。

我的研究只把我带到了https://github.com/flyway/flyway/issues/702但这并没有引导我走上正确的道路。

我也很困惑，flyway 能够在类路径搜索期间找到该文件，但随后无法获取输入流。

如果您需要任何进一步的信息，请询问。

进一步调试：似乎只要将新文件添加到 DB JAR 中，就会发生错误。重建并 migrateDb 后出现错误。如果我再次删除该脚本，尽管该脚本不再位于生成的 JAR 中，但错误仍然发生。所以我猜搜索脚本和检索输入流的类路径是不同的。有谁知道可能存在什么差异？

完整的堆栈跟踪：

Caused by: org.flywaydb.core.api.FlywayException: Unable to obtain inputstream for resource: META-INF/db/mysql/V1__script.sql
        at org.flywaydb.core.internal.util.scanner.classpath.ClassPathResource.loadAsString(ClassPathResource.java:84)
        at org.flywaydb.core.internal.resolver.sql.SqlMigrationResolver.scanForMigrations(SqlMigrationResolver.java:139)
        at org.flywaydb.core.internal.resolver.sql.SqlMigrationResolver.resolveMigrations(SqlMigrationResolver.java:99)
        at org.flywaydb.core.internal.resolver.sql.SqlMigrationResolver.resolveMigrations(SqlMigrationResolver.java:49)
        at org.flywaydb.core.internal.resolver.CompositeMigrationResolver.collectMigrations(CompositeMigrationResolver.java:122)
        at org.flywaydb.core.internal.resolver.CompositeMigrationResolver.doFindAvailableMigrations(CompositeMigrationResolver.java:104)
        at org.flywaydb.core.internal.resolver.CompositeMigrationResolver.resolveMigrations(CompositeMigrationResolver.java:90)
        at org.flywaydb.core.internal.resolver.CompositeMigrationResolver.resolveMigrations(CompositeMigrationResolver.java:43)
        at org.flywaydb.core.internal.info.MigrationInfoServiceImpl.refresh(MigrationInfoServiceImpl.java:114)
        at org.flywaydb.core.internal.command.DbValidate$2.call(DbValidate.java:164)
        at org.flywaydb.core.internal.command.DbValidate$2.call(DbValidate.java:157)
        at org.flywaydb.core.internal.util.jdbc.TransactionTemplate.execute(TransactionTemplate.java:75)
        at org.flywaydb.core.internal.command.DbValidate.validate(DbValidate.java:157)
        at org.flywaydb.core.Flyway.doValidate(Flyway.java:1280)
        at org.flywaydb.core.Flyway.access$100(Flyway.java:71)
        at org.flywaydb.core.Flyway$1.execute(Flyway.java:1176)
        at org.flywaydb.core.Flyway$1.execute(Flyway.java:1168)
        at org.flywaydb.core.Flyway.execute(Flyway.java:1650)
        at org.flywaydb.core.Flyway.migrate(Flyway.java:1168)
        at org.flywaydb.gradle.task.FlywayMigrateTask.run(FlywayMigrateTask.java:28)
        at org.flywaydb.gradle.task.AbstractFlywayTask.runTask(AbstractFlywayTask.java:382)

摇篮任务：

// task that migrates the database
task migrateDb(type: org.flywaydb.gradle.task.FlywayMigrateTask) {
    // parse hibernate config
    def hibernateConfig = parseHibernateConfigByStageParameter()

    // set config
    url = hibernateConfig.url
    driver = hibernateConfig.driver
    user = hibernateConfig.username
    password = hibernateConfig.password
    locations = [ "classpath:${flywayDbPath}/${hibernateConfig.dbType}" ]
    table = 'schema_version'
    outOfOrder = true
    ignoreMissingMigrations = true
}

梯度依赖：

// dependencies
dependencies {
    [...]
    runtime project(':core:db:mysql')
    [...]
}

Answer 1

在进一步测试期间，我注意到该错误似乎是由于 Gradle Daemon 引起的。添加--no-daemon到 migrateDb 调用工作正常并且不会触发错误。

现在对我来说很好。