Luminus H2 留言板应用程序中没有合适的驱动程序

问题描述

尝试使用 Luminus 模板和 H2 db 从 Leiningen 创建简单的示例应用程序。没什么特别的，我确实看到很多这样做的例子，但总是得到 No suitable driver。

lein new luminus guestbook +h2
cd guestbook
lein run

Syntax error (sqlException) compiling at (/private/var/folders/g2/tw6c1syn2hl_915p0xgc2hcm0000gn/T/form-init682714741074384097.clj:1:124).
No suitable driver

Full report at:
/var/folders/g2/tw6c1syn2hl_915p0xgc2hcm0000gn/T/clojure-2526208820906376199.edn

该文件包含：

{:clojure.main/message
 "Syntax error (sqlException) compiling at (/private/var/folders/g2/tw6c1syn2hl_915p0xgc2hcm0000gn/T/form-init682714741074384097.clj:1:124).\nNo suitable driver\n",:clojure.main/triage
 {:clojure.error/phase :compile-Syntax-check,:clojure.error/line 1,:clojure.error/column 124,:clojure.error/source "form-init682714741074384097.clj",:clojure.error/path
  "/private/var/folders/g2/tw6c1syn2hl_915p0xgc2hcm0000gn/T/form-init682714741074384097.clj",:clojure.error/class java.sql.sqlException,:clojure.error/cause "No suitable driver"},:clojure.main/trace
 {:via
  [{:type clojure.lang.Compiler$CompilerException,:message
    "Syntax error compiling at (/private/var/folders/g2/tw6c1syn2hl_915p0xgc2hcm0000gn/T/form-init682714741074384097.clj:1:124).",:data
    {:clojure.error/phase :compile-Syntax-check,:clojure.error/source
     "/private/var/folders/g2/tw6c1syn2hl_915p0xgc2hcm0000gn/T/form-init682714741074384097.clj"},:at [clojure.lang.Compiler load "Compiler.java" 7652]}
   {:type java.lang.RuntimeException,:message "Could not start [#'guestbook.db.core/*db*] due to",:at [mount.core$up$fn__441 invoke "core.cljc" 80]}
   {:type java.lang.RuntimeException,:message
    "Failed to get driver instance for jdbcUrl=jdbc:postgresql://twcrone",:at
    [com.zaxxer.hikari.util.DriverDataSource
     <init>
     "DriverDataSource.java"
     114]}
   {:type java.sql.sqlException,:message "No suitable driver",:at [java.sql.DriverManager getDriver "DriverManager.java" 298]}],:trace
  [[java.sql.DriverManager getDriver "DriverManager.java" 298]
   [com.zaxxer.hikari.util.DriverDataSource
    <init>
    "DriverDataSource.java"
    106]
   [com.zaxxer.hikari.pool.PoolBase
    initializeDataSource
    "PoolBase.java"
    325]
   [com.zaxxer.hikari.pool.PoolBase <init> "PoolBase.java" 114]
   [com.zaxxer.hikari.pool.HikariPool <init> "HikariPool.java" 108]
   [com.zaxxer.hikari.HikariDataSource
    <init>
    "HikariDataSource.java"
    81]
   [hikari_cp.core$make_datasource invokeStatic "core.clj" 268]
   [hikari_cp.core$make_datasource invoke "core.clj" 265]
   [conman.core$connect_BANG_ invokeStatic "core.clj" 162]
   [conman.core$connect_BANG_ invoke "core.clj" 158]
   [guestbook.db.core$eval13387$fn__13388 invoke "core.clj" 10]
   [mount.core$record_BANG_ invokeStatic "core.cljc" 74]
   [mount.core$record_BANG_ invoke "core.cljc" 73]
   [mount.core$up$fn__441 invoke "core.cljc" 81]
   [mount.core$up invokeStatic "core.cljc" 80]
   [mount.core$up invoke "core.cljc" 78]
   [mount.core$bring invokeStatic "core.cljc" 247]
   [mount.core$bring invoke "core.cljc" 239]
   [mount.core$start invokeStatic "core.cljc" 289]
   [mount.core$start doInvoke "core.cljc" 281]
   [clojure.lang.RestFn invoke "RestFn.java" 397]
   [mount.core$start_with_args invokeStatic "core.cljc" 389]
   [mount.core$start_with_args doInvoke "core.cljc" 385]
   [clojure.lang.RestFn invoke "RestFn.java" 410]
   [guestbook.core$start_app invokeStatic "core.clj" 52]
   [guestbook.core$start_app invoke "core.clj" 51]
   [guestbook.core$_main invokeStatic "core.clj" 75]
   [guestbook.core$_main doInvoke "core.clj" 59]
   [clojure.lang.RestFn invoke "RestFn.java" 397]
   [clojure.lang.Var invoke "Var.java" 380]
   [user$eval18339 invokeStatic "form-init682714741074384097.clj" 1]
   [user$eval18339 invoke "form-init682714741074384097.clj" 1]
   [clojure.lang.Compiler eval "Compiler.java" 7181]
   [clojure.lang.Compiler eval "Compiler.java" 7171]
   [clojure.lang.Compiler load "Compiler.java" 7640]
   [clojure.lang.Compiler loadFile "Compiler.java" 7578]
   [clojure.main$load_script invokeStatic "main.clj" 475]
   [clojure.main$init_opt invokeStatic "main.clj" 477]
   [clojure.main$init_opt invoke "main.clj" 477]
   [clojure.main$initialize invokeStatic "main.clj" 508]
   [clojure.main$null_opt invokeStatic "main.clj" 542]
   [clojure.main$null_opt invoke "main.clj" 539]
   [clojure.main$main invokeStatic "main.clj" 664]
   [clojure.main$main doInvoke "main.clj" 616]
   [clojure.lang.RestFn applyTo "RestFn.java" 137]
   [clojure.lang.Var applyTo "Var.java" 705]
   [clojure.main main "main.java" 40]],:cause "No suitable driver",:phase :compile-Syntax-check}}

而且我已经从其他示例中尝试了各种变体。

解决方法

关键是 edn 文件中的错误信息：它引用问题数据库为“jdbcUrl=jdbc:postgresql://twcrone”。这不是 H2 数据库引用，因此您的 Luminus 项目在类路径上只有 h2 驱动程序时会遇到问题。

,

我刚刚运行了 lein new luminus guestbook +h2 然后 cd guestbook 和 lein run 并且（在下载了很多库之后）它按预期启动了网络服务器并且浏览 http://127.0.0.1:3000 显示了 Luminus 网络应用。

您能否分享您采取的导致该错误的确切步骤？