Maven 依赖项上的 java.lang.ClassNotFoundException

标签 java spring maven spring-boot microservices

<分区>

我们有一组以微服务形式组织的 Spring Boot 应用程序，成功运行了几个月。我们使用 Sprig Boot 1.3.3。

现在我们在将 maven 构建过程切换到 Spring Boot 1.4.2 时遇到了问题。我们正在开发基于微服务的软件架构。我们有 core.common 服务，其他服务使用这样的依赖项引用该服务:

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

此服务负责提供每个其他服务所需的通用类和方法。

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

<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 Spring Boot 1.4.2 版本之前，我们能够通过 root.service 执行 mvn clean install 来测试和构建来自 的其余服务>模块规范。

切换到 Spring Boot 1.4.2 版本后，当我尝试在 root.service 中执行 mvn clean install 时，我得到了 java.lang.ClassNotFoundException 。异常消息表明，modules 规范中的任何服务都无法从 core.common 服务中找到任何用于 modules 特定服务的类。 当我尝试运行 mvn compile 或 mvn test 时，一切都运行良好，并且我获得了成功的构建和测试。当我尝试从 eclipse 运行服务时，一切都很好。

你有什么想法吗？请帮忙。

编辑 一个用例的完整堆栈跟踪:

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: 这是我运行 mvn -e clean install 时得到的结果:

[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

最佳答案

我猜这是因为 Spring Boot 1.4 中 jar 文件的结构发生了变化:Release Notes

The layout of executable jars has changed. If you are using Spring Boot’s Maven, Gradle, or Ant support to build your application this change will not affect you. If you are building an executable archive yourself, please be aware that an application’s dependencies are now packaged in BOOT-INF/lib rather than lib, and an application’s own classes are now packaged in BOOT-INF/classes rather than the root of the jar.

关于Maven 依赖项上的 java.lang.ClassNotFoundException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40760397/

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