到目前为止,我有两个测试。一个只使用jUnit框架并且工作正常。另一个使用spring-test库并在每次尝试运行时创建此异常。什么可能导致问题的想法?
错误
java.lang.NoSuchFieldError: NULL
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:48)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:59)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.<init>(SpringJUnit4ClassRunner.java:104)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:27)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:32)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:41)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:31)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Maven测试依赖项
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${org.springframework.version}</version>
<scope>test</scope>
</dependency>
依赖树
[INFO] [dependency:tree {execution: default-cli}]
[INFO] fake:war:1.0-SNAPSHOT
[INFO] +- log4j:log4j:jar:1.2.16:compile
[INFO] +- org.springframework:spring-web:jar:3.0.5.RELEASE:compile
[INFO] | +- aopalliance:aopalliance:jar:1.0:compile
[INFO] | +- org.springframework:spring-beans:jar:3.0.5.RELEASE:compile
[INFO] | +- org.springframework:spring-context:jar:3.0.5.RELEASE:compile
[INFO] | | +- org.springframework:spring-aop:jar:3.0.5.RELEASE:compile
[INFO] | | +- org.springframework:spring-expression:jar:3.0.5.RELEASE:compile
[INFO] | | \- org.springframework:spring-asm:jar:3.0.5.RELEASE:compile
[INFO] | \- org.springframework:spring-core:jar:3.0.5.RELEASE:compile
[INFO] | \- commons-logging:commons-logging:jar:1.1.1:compile
[INFO] +- commons-codec:commons-codec:jar:1.4:compile
[INFO] +- org.glassfish:javax.faces:jar:2.1.3:compile
[INFO] +- org.richfaces.ui:richfaces-components-ui:jar:4.0.0.Final:compile
[INFO] | +- org.richfaces.ui:richfaces-components-api:jar:4.0.0.Final:compile
[INFO] | \- org.richfaces.core:richfaces-core-api:jar:4.0.0.Final:compile
[INFO] +- org.richfaces.core:richfaces-core-impl:jar:4.0.0.Final:compile
[INFO] | +- net.sourceforge.cssparser:cssparser:jar:0.9.5:compile
[INFO] | | \- org.w3c.css:sac:jar:1.3:compile
[INFO] | \- com.google.guava:guava:jar:r08:compile
[INFO] +- org.hibernate:hibernate-validator:jar:4.2.0.Final:compile
[INFO] | \- org.slf4j:slf4j-api:jar:1.6.1:compile
[INFO] +- javax.validation:validation-api:jar:1.0.0.GA:compile
[INFO] +- javax.xml.bind:jaxb-api:jar:2.2.2:compile
[INFO] | +- javax.xml.stream:stax-api:jar:1.0-2:compile
[INFO] | \- javax.activation:activation:jar:1.1:compile
[INFO] +- com.sun.xml.bind:jaxb-impl:jar:2.2.2:compile
[INFO] +- javax.servlet:jstl:jar:1.1.2:compile
[INFO] +- junit:junit:jar:4.7:test
[INFO] +- org.springframework:spring-test:jar:3.0.5.RELEASE:test
[INFO] +- javax.servlet:jsp-api:jar:2.0:provided
[INFO] \- javax.servlet:servlet-api:jar:2.4:provided
答案 0 :(得分:20)
您使用的是旧版本的Eclipse(Galileo还是以前版本)?或junit插件的旧版本?如果是这样,这可能是问题的原因。 ParentRunner正在寻找在JUnit 4.5中引入的Sorter.NULL:
package org.junit.runner.manipulation;
public class Sorter implements Comparator<Description> {
/**
* NULL is a <code>Sorter</code> that leaves elements in an undefined order
*/
public static Sorter NULL= new Sorter(new Comparator<Description>() {
public int compare(Description o1, Description o2) {
return 0;
}});
如果您没有这段代码,那么您可能正在使用4.5之前的版本。在Eclipse上,执行Ctrl-Shift-T并查看是否有多个版本的Sorter类可用,如果可用,请确保它们都不是4.5之前的版本。另外,在Build Path中查看项目设置,如果有JUnit条目(不是maven版本),请将其删除,然后重试。
编辑:这也可能是由Maven的传递依赖引起的。也许您的某个库依赖于4.5之前的JUnit版本。
答案 1 :(得分:2)
我已经解决了这个问题,改为JUnit 4.10。最初的例外是:
java.lang.NoSuchFieldError: NULL
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:54)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:55)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl$1.<init>(JUnit45AndHigherRunnerImpl.java:23)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.<init>(JUnit45AndHigherRunnerImpl.java:23)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.mockito.internal.runners.util.RunnerProvider.newInstance(RunnerProvider.java:39)
at org.mockito.internal.runners.RunnerFactory.create(RunnerFactory.java:28)
at org.mockito.runners.MockitoJUnitRunner.<init>(MockitoJUnitRunner.java:57)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.junit.internal.requests.ClassRequest.buildRunner(ClassRequest.java:33)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:28)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:32)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:41)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:31)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
答案 2 :(得分:1)
这看起来像是因为你的类路径中有多个JUnit依赖项(不同版本)。检查你的类路径(如果你没有注意maven做一个mvn依赖:树),然后摆脱旧的(再次,如果使用maven,找出哪个直接导入的依赖项导入反过来旧的JUnit,并使关于pom.xml中JUnit子依赖项的依赖项的<exclusion>
。此外,您可能希望将实际的JUnit依赖关系更新为最新版本(至少)4.10。
答案 3 :(得分:1)
我有完全相同的问题,我发现它是由org.jmock:jmock-junit4的传递依赖引起的。当我用org.jmock:jmock替换它时,它被排序。
答案 4 :(得分:0)
由于同样的原因,我收到了这个错误。但在我的情况下,由于我的项目使用传递依赖项(项目之间),我无法通过查看我的pom.xml或maven源代码树来查看不同版本的Junits。我,项目&#34; A&#34;依赖项目&#34; B&#34;。所以项目&#34; A&#34;直接引用&#34; B&#34;(来自工作区)。所以当发生这种情况时,我们将无法确定依赖项中是否存在不同版本的junit。所以我做的是,我关闭了项目&#34; B&#34;。已删除的项目&#34; A&#34;来自eclipse(不是来自工作区)。在项目&#34; A&#34;源目录,删除除pom,src和svn支持文件夹之外的所有文件。将文件重新导入到eclipse中。这解决了这个问题。