编译JUnit测试时从Maven抛出的ClassNotFoundException

Question

我有一个Maven项目，在我的Mac上编译得很好 - 但我第一次将它移到我的Windows 10 PC上，并且发现我的JUnit测试出现奇怪的编译问题。失败是：

stringContainingEmojiWithTrailingSpaceIsDetected(com.myapp.EmojiUtilTest) Time elapsed: 0.002 sec <<< ERROR! 
java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/JavaType 
     at emoji4j.EmojiUtils.removeAllEmojis(EmojiUtils.java:241) 
     ... 
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.JavaType 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 

这似乎是一个传递依赖：

<dependency> 
    <groupId>com.kcthota</groupId> 
    <artifactId>emoji4j</artifactId> 
    <version>5.0</version> 
</dependency> 

作为mvn dependency:tree包含：

[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ myapp --- 
[INFO] com.craigotis.myapp:myapp:jar:0.0.1-SNAPSHOT 
[INFO] +- com.google.code.gson:gson:jar:2.8.0:compile 
[INFO] +- mysql:mysql-connector-java:jar:6.0.5:compile 
[INFO] +- org.springframework:spring-jdbc:jar:4.3.4.RELEASE:compile 
[INFO] | +- org.springframework:spring-beans:jar:4.3.4.RELEASE:compile 
[INFO] | +- org.springframework:spring-core:jar:4.3.4.RELEASE:compile 
[INFO] | \- org.springframework:spring-tx:jar:4.3.4.RELEASE:compile 
[INFO] +- javax.transaction:javax.transaction-api:jar:1.2:compile 
[INFO] +- org.apache.commons:commons-dbcp2:jar:2.0.1:compile 
[INFO] | +- org.apache.commons:commons-pool2:jar:2.2:compile 
[INFO] | \- commons-logging:commons-logging:jar:1.1.3:compile 
[INFO] +- org.apache.logging.log4j:log4j-api:jar:2.7:compile 
[INFO] +- org.apache.logging.log4j:log4j-core:jar:2.7:compile 
[INFO] +- junit:junit:jar:4.11:test 
[INFO] | \- org.hamcrest:hamcrest-core:jar:1.3:test 
[INFO] +- com.ibm.icu:icu4j:jar:58.1:compile 
[INFO] \- com.kcthota:emoji4j:jar:5.0:compile 
[INFO] +- com.fasterxml.jackson.core:jackson-core:jar:2.7.0:compile 
[INFO] +- com.fasterxml.jackson.core:jackson-databind:jar:2.7.0:compile 
[INFO] | \- com.fasterxml.jackson.core:jackson-annotations:jar:2.7.0:compile 
[INFO] \- com.googlecode.lambdaj:lambdaj:jar:2.3.3:compile 
[INFO]  +- org.hamcrest:hamcrest-all:jar:1.1:compile 
[INFO]  +- org.objenesis:objenesis:jar:1.2:compile 
[INFO]  \- cglib:cglib-nodep:jar:2.2:compile 

但我似乎无法理解为什么类没有找到 - 如果我检查我的Maven存储库，JAR存在：

~\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.7.0\jackson-databind-2.7.0.jar 

与JAR中的JavaType.class类一样。

手动添加jackson-databind依赖项到我的POM似乎没有什么区别。

什么会导致此类在测试编译期间未被Maven找到，该机器上的？

编辑：此外，如果我有调试日志记录运行Maven，我看到：

[DEBUG] test classpath classpath: 
[DEBUG] C:\Users\Craig\projects\myproject\target\test-classes 
[DEBUG] C:\Users\Craig\projects\myproject\target\classes 
[DEBUG] C:\Users\Craig\.m2\repository\com\google\code\gson\gson\2.8.0\gson-2.8.0.jar 
[DEBUG] C:\Users\Craig\.m2\repository\mysql\mysql-connector-java\6.0.5\mysql-connector-java-6.0.5.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\springframework\spring-jdbc\4.3.4.RELEASE\spring-jdbc-4.3.4.RELEASE.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\springframework\spring-beans\4.3.4.RELEASE\spring-beans-4.3.4.RELEASE.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\springframework\spring-core\4.3.4.RELEASE\spring-core-4.3.4.RELEASE.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\springframework\spring-tx\4.3.4.RELEASE\spring-tx-4.3.4.RELEASE.jar 
[DEBUG] C:\Users\Craig\.m2\repository\javax\transaction\javax.transaction-api\1.2\javax.transaction-api-1.2.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\apache\commons\commons-dbcp2\2.0.1\commons-dbcp2-2.0.1.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\apache\commons\commons-pool2\2.2\commons-pool2-2.2.jar 
[DEBUG] C:\Users\Craig\.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\apache\logging\log4j\log4j-api\2.7\log4j-api-2.7.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\apache\logging\log4j\log4j-core\2.7\log4j-core-2.7.jar 
[DEBUG] C:\Users\Craig\.m2\repository\junit\junit\4.11\junit-4.11.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar 
[DEBUG] C:\Users\Craig\.m2\repository\com\ibm\icu\icu4j\58.1\icu4j-58.1.jar 
[DEBUG] C:\Users\Craig\.m2\repository\com\kcthota\emoji4j\5.0\emoji4j-5.0.jar 
[DEBUG] C:\Users\Craig\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.7.0\jackson-core-2.7.0.jar 
[DEBUG] C:\Users\Craig\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.7.0\jackson-databind-2.7.0.jar 
[DEBUG] C:\Users\Craig\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.7.0\jackson-annotations-2.7.0.jar 
[DEBUG] C:\Users\Craig\.m2\repository\com\googlecode\lambdaj\lambdaj\2.3.3\lambdaj-2.3.3.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\hamcrest\hamcrest-all\1.1\hamcrest-all-1.1.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\objenesis\objenesis\1.2\objenesis-1.2.jar 
[DEBUG] C:\Users\Craig\.m2\repository\cglib\cglib-nodep\2.2\cglib-nodep-2.2.jar 
[DEBUG] provider classpath classpath: 
[DEBUG] C:\Users\Craig\.m2\repository\org\apache\maven\surefire\surefire-junit4\2.12.4\surefire-junit4-2.12.4.jar 
[DEBUG] C:\Users\Craig\.m2\repository\org\apache\maven\surefire\surefire-api\2.12.4\surefire-api-2.12.4.jar 

这似乎清楚地列出了杰克逊的JAR文件。

Answer 1

颜色我很困惑。我将我的jackson目录更名为我的.m2文件夹，并让Maven下载新的依赖项，并且错误消失。

尽管内部看起来相同，但JAR的大小不同。 新左侧，老右侧：