设置H2 init运行脚本时出现问题。使用Java模块化系统时,如果脚本不在类路径根文件夹中,则找不到文件

2022-04-08 00:00:00 java h2

以下是有关如何从资源文件夹初始化运行脚本的问题的接受答案:problem with INIT=RUNSCRIPT and relative paths。

连接字符串:

jdbc:h2:mem:;INIT=RUNSCRIPT FROM 'classpath:desktop/core/database/databaseCreation.sql'

但是,我得到异常,即使文件存在,也找不到文件。

异常:

org.h2.jdbc.JdbcSQLNonTransientException: IO Exception: "java.io.FileNotFoundException: resource /desktop/core/database/databaseCreation.sql"; "classpath:desktop/core/database/databaseCreation.sql"; SQL statement:
RUNSCRIPT FROM 'classpath:desktop/core/database/databaseCreation.sql' [90031-210]
    at com.h2database@2.1.210/org.h2.message.DbException.getJdbcSQLException(DbException.java:573)
    at com.h2database@2.1.210/org.h2.message.DbException.getJdbcSQLException(DbException.java:496)
    at com.h2database@2.1.210/org.h2.message.DbException.get(DbException.java:216)
    at com.h2database@2.1.210/org.h2.message.DbException.convertIOException(DbException.java:461)
    at com.h2database@2.1.210/org.h2.command.dml.ScriptBase.openInput(ScriptBase.java:168)
    at com.h2database@2.1.210/org.h2.command.dml.RunScriptCommand.update(RunScriptCommand.java:52)
    at com.h2database@2.1.210/org.h2.command.CommandContainer.update(CommandContainer.java:174)
    at com.h2database@2.1.210/org.h2.command.Command.executeUpdate(Command.java:252)
    at com.h2database@2.1.210/org.h2.engine.Engine.openSession(Engine.java:279)
    at com.h2database@2.1.210/org.h2.engine.Engine.createSession(Engine.java:201)
    at com.h2database@2.1.210/org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:338)
    at com.h2database@2.1.210/org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:122)
    at com.h2database@2.1.210/org.h2.Driver.connect(Driver.java:59)
    at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:681)
    at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:252)
    at ispfdesktop/desktop.core.database.DatabaseManager.connectToInMemoryDatabase(DatabaseManager.java:184)
    at ispfdesktop/desktop.core.database.CRUDTests.setUpBeforeClass(CRUDTests.java:21)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
    at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
    at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptLifecycleMethod(TimeoutExtension.java:126)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptBeforeAllMethod(TimeoutExtension.java:68)
    at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$invokeBeforeAllMethods$9(ClassBasedTestDescriptor.java:384)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeBeforeAllMethods(ClassBasedTestDescriptor.java:382)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.before(ClassBasedTestDescriptor.java:196)
    at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.before(ClassBasedTestDescriptor.java:78)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:136)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:84)
    at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:98)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:40)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:529)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:756)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:452)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)
Caused by: java.io.FileNotFoundException: resource /desktop/core/database/databaseCreation.sql
    at com.h2database@2.1.210/org.h2.store.fs.disk.FilePathDisk.newInputStream(FilePathDisk.java:386)
    at com.h2database@2.1.210/org.h2.store.fs.FileUtils.newInputStream(FileUtils.java:267)
    at com.h2database@2.1.210/org.h2.command.dml.ScriptBase.openInput(ScriptBase.java:166)
    ... 69 more

尝试使用getResource(DatabaseManager类位于desktop.core.database包中)访问文件时会发现文件已存在:

String file = DatabaseManager.class.getResource("databaseCreation.sql").getFile();
boolean yes = new File(file).exists(); // yes is true

已在Windows(10)和Linux(Kubuntu)平台上试用,并使用2.1.210版的H2。

更新#1

文件在根类路径文件夹classpath:databaseCreation.sql中找到,但在某个子文件夹(如桌面/core/数据库)下仍找不到。

在第一个子文件夹前追加"/"无效。

已尝试将SQL文件放入所有文件夹。

'classpath:desktop/core/database/databaseCreation.sql'不起作用

'classpath:desktop/core/databaseCreation.sql'不起作用

'classpath:desktop/databaseCreation.sql'不起作用

只有这样才有效

'classpath:databaseCreation.sql'

不使用类路径:

在不使用类路径的情况下,文件可以位于任何子文件夹中,但这样,我需要使用文件的绝对路径:

jdbc:h2:mem:;INIT=RUNSCRIPT FROM '<absolute path here>'

将问题保留为打开状态,因为引用的问题的答案已过期,该答案在当前H2版本上不起作用,并且希望了解如何使用classpath使其起作用。

更新2

为了进行复制,您需要在项目中使用Java模块化系统(MODULE-INFO.Java)。


解决方案

更新:(模块-info.Java)

根据您的评论,您的原始设置使用的是JDK 9+模块。这是一个复杂而令人困惑的话题。最简单的方法就是删除MODULE-info.Java,而不使用模块。如果您打算使用模块并将资源保存在单独的目录(模块)中,则有多个选项,但没有一个明确的选择。也许最简单的选择是打开包含该资源的";包。在我的本地测试中,类似这样的内容起作用了:

module myAppModule {
    exports desktop.core.database;

    opens desktop.core.database;

    requires java.sql;
    requires org.junit.jupiter.api;
}

更多信息:

  • https://www.oracle.com/corporate/features/understanding-java-9-modules.html
  • Loading classes and resources in Java 9
  • Accessing resource files in a java jigsaw module
  • How to access resource using class loader in Java 9
  • Accessing resource files from external modules

原始

我无法使用非常简单的Maven设置复制您的问题,该设置仅将H2运行时作为依赖项(相同版本,2.1.210)以及JUnit5。它按预期工作。

堆栈跟踪显示这是作为一个测试从Eclipse中运行的。如果我手动添加src/main/resources作为Java构建路径源文件夹,但不包括**/,这将排除资源的子目录,我可以在Eclipse中准确地复制您的问题。

如果您使用的是maven,或许可以尝试使用mvn test在命令行上运行,以验证它不是您的Eclipse安装程序。

否则,您将需要发布更多信息以获取帮助。

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