Maven依赖项上的java.lang.ClassNotFoundException

Question

我们有一组Spring应用程序，它们作为微服务成功地运行了几个月。我们使用了小枝启动1.3.3。

现在，我们在将maven构建过程切换到Spring 1.4.2时遇到了问题。我们正在开发基于微服务的软件体系结构。我们有core.common服务，它由其他服务引用，使用如下所示的依赖关系：

<dependencies>
    <dependency>
        <groupId>com.group</groupId>
        <artifactId>core.common</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <scope>compile</scope>
    </dependency>
</dependencies> 

该服务负责为每个其他服务提供所需的公共类和方法。

我们还使用单独的服务(root.service)构建所有其他服务，并将它们打包到jar文件中。这是pom.xml的一部分来自root.service

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.2.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <modules>
        <module>../core.adminservice</module>
        <module>../core.locationservice</module>
        <module>../core.reportservice</module>
        <module>../core.userservice</module>
        <module>../core.notificationservice</module>
        <module>../core.trackingservice</module>
        <module>../core.mappingservice</module>
        <module>../core.common</module>
    </modules>

在切换到SpringBoot1.4.2版本之前，我们能够在root.service上执行mvn clean install来测试和构建模块规范中的其余服务。

切换到SpringBoot1.4.2版本之后，当我尝试在root.service中执行mvn clean install时，我将得到java.lang.ClassNotFoundException。异常消息指出，构成模块规范的任何服务都找不到来自core.common服务的任何类，特别是来自模块的服务。当我尝试运行mvn compile或mvn test时，一切都运行得很好，并且我获得了成功的构建和测试。当我尝试从运行服务时，一切都很好。

你有什么想法吗？请帮帮忙。

为一个用例编辑全堆栈跟踪：

Running com.blockpeek.core.adminservice.tests.services.AdminServiceTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.002 sec <<< FAILURE! - in com.blockpeek.core.adminservice.tests.services.AdminServiceTest
initializationError(com.blockpeek.core.adminservice.tests.services.AdminServiceTest)  Time elapsed: 0.002 sec  <<< ERROR!
java.lang.NoClassDefFoundError: com/blockpeek/core/common/services/AbstractCRUDService
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
    at java.lang.Class.getDeclaredFields(Class.java:1916)
    at org.junit.runners.model.TestClass.getSortedDeclaredFields(TestClass.java:77)
    at org.junit.runners.model.TestClass.scanAnnotatedMembers(TestClass.java:70)
    at org.junit.runners.model.TestClass.<init>(TestClass.java:57)
    at org.junit.runners.ParentRunner.createTestClass(ParentRunner.java:88)
    at org.junit.runners.ParentRunner.<init>(ParentRunner.java:83)
    at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.<init>(SpringJUnit4ClassRunner.java:138)
    at org.springframework.test.context.junit4.SpringRunner.<init>(SpringRunner.java:49)
    at sun.reflect.GeneratedConstructorAccessor2.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104)
    at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
    at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
    at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128)
    at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)
    at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
Caused by: java.lang.ClassNotFoundException: com.blockpeek.core.common.services.AbstractCRUDService
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
    at java.lang.Class.getDeclaredFields(Class.java:1916)
    at org.junit.runners.model.TestClass.getSortedDeclaredFields(TestClass.java:77)
    at org.junit.runners.model.TestClass.scanAnnotatedMembers(TestClass.java:70)
    at org.junit.runners.model.TestClass.<init>(TestClass.java:57)
    at org.junit.runners.ParentRunner.createTestClass(ParentRunner.java:88)
    at org.junit.runners.ParentRunner.<init>(ParentRunner.java:83)
    at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.<init>(SpringJUnit4ClassRunner.java:138)
    at org.springframework.test.context.junit4.SpringRunner.<init>(SpringRunner.java:49)
    at sun.reflect.GeneratedConstructorAccessor2.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104)
    at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
    at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
    at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128)
    at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)
    at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)

Maven版本：

$ mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T17:41:47+01:00)
Maven home: C:\Program Files\apache-maven-3.3.9
Java version: 1.8.0_101, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk1.8.0_101\jre
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 10", version: "10.0", arch: "amd64", family: "dos"

编辑2:这就是我运行mvn -e clean install时得到的

[ERROR] -> [Help 1]                                                                                                                             
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.0:compile (def
ult-compile) on project core.adminservice: Compilation failure                                                                                  
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)                                                      
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)                                                      
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)                                                      
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)                             
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)                              
        at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)                
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)                                              
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)                                                                       
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)                                                                       
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)                                                                         
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)                                                                             
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)                                                                              
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)                                                                                
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)                                                                          
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)                                                        
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)                                                
        at java.lang.reflect.Method.invoke(Method.java:498)                                                                                     
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)                                                  
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)                                                          
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)                                                
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)                                                            
Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: Compilation failure                                                    
        at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:1029)                                        
        at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:137)                                                         
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)                                    
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)                                                      
        ... 20 more                                                                                                                             
[ERROR]                                                                                                                                         
[ERROR] Re-run Maven using the -X switch to enable full debug logging.                                                                          
[ERROR]                                                                                                                                         
[ERROR] For more information about the errors and possible solutions, please read the following articles:                                       
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException                                                          
[ERROR]                                                                                                                                         
[ERROR] After correcting the problems, you can resume the build with the command                                                                
[ERROR]   mvn <goals> -rf :core.adminservice  

Answer 1

我想这是因为SpringBoot1.4：发行说明中jar文件的结构发生了变化。

可执行jars的布局已经改变。如果使用Spring的Maven、Gradle或Ant支持来构建应用程序，则此更改不会影响您。如果您自己正在构建可执行文件，请注意，应用程序的依赖项现在打包在BOOT-INF/lib而不是lib中，应用程序自己的类现在打包在BOOT-INF/classes中，而不是jar的根中。