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java - NoClassDefFoundError:注释处理期间的 org/junit/AfterClass

转载 作者:太空宇宙 更新时间:2023-11-04 08:31:36 25 4
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我在使用 Maven 进行注释处理期间使用 CodeModel 生成代码。该代码用于 JUnit 测试:

JMethod tearDownClass = testClass.method(
JMod.PUBLIC | JMod.STATIC, Void.class, "tearDownClass");
tearDownClass._throws(Exception.class);
tearDownClass.annotate(AfterClass.class); <- java.lang.NoClassDefFoundError

然而,当编译过程尝试检索 AfterClass.class(它本身就是一个注释)时,它会抛出 java.lang.NoClassDefFoundError : org/junit/AfterClass

对 JUnit 的依赖定义如下:

<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
</dependency>

所以 AfterClass.class 应该在我的代码中可用。

如何解决这个问题?

不清楚

调用 codemodel 的代码位于编译库中,其中 junit 不是“测试”依赖项。但是,调用生成代码的代码具有相同的 junit 依赖项,但作为测试依赖项。

如果我将后一个依赖项更改为“非测试”依赖项,问题就会消失。为什么我必须将此依赖项定义为“非测试”,尽管只有调用代码模型的库明确使用它?

编辑

这是依赖树:

net.dwst:codegentest:jar:1.0.0
+- junit:junit:jar:4.8.2:compile
+- org.sonatype.maven.plugin:emma-maven-plugin:jar:1.2:test
| +- emma:emma:jar:2.0.5312:test
| \- org.apache.maven.reporting:maven-reporting-impl:jar:2.0.4:test
| +- commons-validator:commons-validator:jar:1.2.0:test
| | +- commons-beanutils:commons-beanutils:jar:1.7.0:test
| | +- commons-digester:commons-digester:jar:1.6:test
| | | \- commons-collections:commons-collections:jar:2.1:test
| | \- commons-logging:commons-logging:jar:1.0.4:test
| +- org.apache.maven.doxia:doxia-core:jar:1.0-alpha-7:test
| +- oro:oro:jar:2.0.7:test
| \- org.apache.maven.doxia:doxia-site-renderer:jar:1.0-alpha-7:test
| +- org.codehaus.plexus:plexus-i18n:jar:1.0-beta-6:test
| +- org.codehaus.plexus:plexus-velocity:jar:1.1.2:test
| | +- commons-logging:commons-logging-api:jar:1.0.4:test
| | \- velocity:velocity:jar:1.4:test
| | \- velocity:velocity-dep:jar:1.4:test
| \- org.apache.maven.doxia:doxia-decoration-model:jar:1.0-alpha-7:test
+- net.dwst:generics:jar:1.3.0:compile
| +- org.swinglabs:swing-layout:jar:1.0.3:compile
| \- com.sun.codemodel:codemodel:jar:2.4.1:compile
+- net.flat:flat:jar:1.3.0:compile
| \- com.pyx4me:proguard-maven-plugin:jar:2.0.4:compile
| +- ant:ant:jar:1.6.5:compile
| +- org.apache.maven:maven-archiver:jar:2.3:compile
| +- org.codehaus.plexus:plexus-archiver:jar:1.0-alpha-9:compile
| \- org.codehaus.plexus:plexus-io:jar:1.0-alpha-1:compile
+- org.codehaus.mojo:build-helper-maven-plugin:jar:1.7:compile
| +- org.apache.maven:maven-model:jar:2.0.6:compile
| +- org.apache.maven:maven-project:jar:2.0.6:compile
| | +- org.apache.maven:maven-settings:jar:2.0.6:compile
| | +- org.apache.maven:maven-profile:jar:2.0.6:compile
| | +- org.apache.maven:maven-artifact-manager:jar:2.0.6:compile
| | +- org.apache.maven:maven-plugin-registry:jar:2.0.6:compile
| | \- org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-9-stable-1:compile
| +- org.apache.maven:maven-core:jar:2.0.6:compile
| | +- org.apache.maven.wagon:wagon-file:jar:1.0-beta-2:runtime
| | +- org.apache.maven:maven-plugin-parameter-documenter:jar:2.0.6:compile
| | +- org.apache.maven.wagon:wagon-http-lightweight:jar:1.0-beta-2:runtime
| | | +- org.apache.maven.wagon:wagon-http-shared:jar:1.0-beta-2:runtime
| | | \- xml-apis:xml-apis:jar:1.0.b2:runtime
| | +- org.apache.maven.reporting:maven-reporting-api:jar:2.0.8:compile
| | | \- org.apache.maven.doxia:doxia-sink-api:jar:1.0-alpha-7:compile
| | +- org.apache.maven.wagon:wagon-provider-api:jar:1.0-beta-2:compile
| | +- org.apache.maven:maven-repository-metadata:jar:2.0.6:compile
| | +- org.apache.maven:maven-error-diagnostics:jar:2.0.6:compile
| | +- commons-cli:commons-cli:jar:1.0:compile
| | +- org.apache.maven.wagon:wagon-ssh-external:jar:1.0-beta-2:runtime
| | | \- org.apache.maven.wagon:wagon-ssh-common:jar:1.0-beta-2:runtime
| | +- org.apache.maven:maven-plugin-descriptor:jar:2.0.6:compile
| | +- org.codehaus.plexus:plexus-interactivity-api:jar:1.0-alpha-4:compile
| | +- org.apache.maven:maven-monitor:jar:2.0.6:compile
| | +- org.apache.maven.wagon:wagon-ssh:jar:1.0-beta-2:runtime
| | | \- com.jcraft:jsch:jar:0.1.27:runtime
| | \- classworlds:classworlds:jar:1.1:compile
| +- org.apache.maven:maven-plugin-api:jar:2.0.6:compile
| +- org.apache.maven:maven-artifact:jar:2.0.6:compile
| \- org.codehaus.plexus:plexus-utils:jar:1.5.8:compile
\- org.bsc.maven:maven-processor-plugin:jar:2.0.3:compile
\- org.jfrog.maven.annomojo:maven-plugin-tools-anno:jar:1.4.0:compile
+- org.jfrog.maven.annomojo:maven-plugin-anno:jar:1.4.0:compile
+- org.apache.maven.plugin-tools:maven-plugin-tools-api:jar:2.6:compile
| \- jtidy:jtidy:jar:4aug2000r7-dev:compile
\- com.sun:tools:jar:1.5.0:system

很奇怪:

+- net.dwst:generics:jar:1.3.0:compile
| +- org.swinglabs:swing-layout:jar:1.0.3:compile
| \- com.sun.codemodel:codemodel:jar:2.4.1:compile

不包含org.junit,是的,这个库的pom.xml有:

<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
</dependency>

...

最佳答案

如果我正确理解您的情况,您拥有的是两个库(A 和 B):

A是调用codemodel的代码。这依赖于 junit 4.8.2(编译范围)。

B 是调用 A 的代码(生成代码)。这依赖于 junit 4.8.2(测试范围)。

显然,B 依赖于 A。

来自Maven Dependency Scope ,我们有以下行,

Each of the scopes (except for import) affects transitive dependencies in different ways, as is demonstrated in the table below. If a dependency is set to the scope in the left column, transitive dependencies of that dependency with the scope across the top row will result in a dependency in the main project with the scope listed at the intersection. If no scope is listed, it means the dependency will be omitted.

传递依赖是来自直接依赖的依赖。所以库 X 依赖于库 Y。库 Y 依赖于库 Z。所以 Z 是库 X 的传递依赖。

在您的情况下,B 既直接依赖于 junit(具有测试范围),又通过 A 对 junit(具有编译范围)具有传递依赖性。如果我们阅读该表,我们可以看到这意味着优先的范围是test。这就是为什么您的代码无法找到 AfterClass.class,因为它不会被包含在内。

最好的选择是按照您已经尝试过的方式设置编译范围。

关于java - NoClassDefFoundError:注释处理期间的 org/junit/AfterClass,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7373105/

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