Maven没有找到org.junit，即使它位于依赖项中

我想在我的小项目中添加一个测试（请注意我从代码中删除了一些位并更改了包名，所以如果你看到任何错误，可能不是这个;））：

package my.pckg; import static org.junit.Assert.*; import org.junit.After; import org.junit.Before; import org.junit.Test; public class SignedRequestCallbackTest { @Before public void setUp() throws Exception { } @After public void tearDown() throws Exception { } @Test public void testCorrectSignedRequest() { assertTrue(false); } } 

（我也尝试从TestCase扩展以删除静态导入，但它没有帮助）

运行mvn test它显示一个错误，它无法找到org.junit：

 [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Test Server 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ server --- [WARNING] Using platform encoding (MacRoman actually) to copy filtered resources, ie build is platform dependent! [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ server --- [WARNING] File encoding has not been set, using platform encoding MacRoman, ie build is platform dependent! [INFO] Compiling 9 source files to /Users/michael/Projects/fbmuc/server/target/classes [INFO] ------------------------------------------------------------- [ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[4,27] package org.junit does not exist [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[6,16] package org.junit does not exist [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[7,16] package org.junit does not exist [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[8,16] package org.junit does not exist [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[14,9] cannot find symbol symbol : class Before location: class my.pckgSignedRequestCallbackTest [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[18,9] cannot find symbol symbol : class After location: class my.pckgSignedRequestCallbackTest [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[22,9] cannot find symbol symbol : class Test location: class my.pckgSignedRequestCallbackTest [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[24,12] cannot find symbol symbol : method assertTrue(boolean) location: class my.pckgSignedRequestCallbackTest [INFO] 9 errors [INFO] ------------------------------------------------------------- [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.161s [INFO] Finished at: Fri Feb 22 18:02:37 CET 2013 [INFO] Final Memory: 8M/81M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project server: Compilation failure: Compilation failure: [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[4,27] package org.junit does not exist [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[4,4] static import only from classes and interfaces [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[6,16] package org.junit does not exist [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[7,16] package org.junit does not exist [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[8,16] package org.junit does not exist [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[14,9] cannot find symbol [ERROR] symbol : class Before [ERROR] location: class my.pckgSignedRequestCallbackTest [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[18,9] cannot find symbol [ERROR] symbol : class After [ERROR] location: class my.pckgSignedRequestCallbackTest [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[22,9] cannot find symbol [ERROR] symbol : class Test [ERROR] location: class my.pckgSignedRequestCallbackTest [ERROR] ~/code/src/test/java/my/pckg/SignedRequestCallbackTest.java:[24,12] cannot find symbol [ERROR] symbol : method assertTrue(boolean) [ERROR] location: class my.pckgSignedRequestCallbackTest [ERROR] -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [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 

我的pom.xml看起来像这样：

   4.0.0 com.example server 0.0.1-SNAPSHOT TestServer Test  src   org.apache.maven.plugins maven-compiler-plugin 2.3.2  1.6 1.6    maven-assembly-plugin   jar-with-dependencies         com.restfb restfb 1.6.11    com.google.code.gson gson 2.2.2 compile    tigase tigase-server 5.2.0-SNAPSHOT   commons-codec commons-codec 1.7   junit junit 4.11 test     tigase Tigase repository http://maven.tigase.org   tigase-snapshot Tigase repository http://build.xmpp-test.net/maven/  true     

mvn依赖：树：

 [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Test Server 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-dependency-plugin:2.1:tree (default-cli) @ server --- [INFO] my.pckg:server:jar:0.0.1-SNAPSHOT [INFO] +- com.restfb:restfb:jar:1.6.11:compile [INFO] +- com.google.code.gson:gson:jar:2.2.2:compile [INFO] +- tigase:tigase-server:jar:5.2.0-SNAPSHOT:compile [INFO] | +- tigase:tigase-utils:jar:3.4.1-SNAPSHOT:compile [INFO] | \- tigase:tigase-xmltools:jar:3.4.3-SNAPSHOT:compile [INFO] +- commons-codec:commons-codec:jar:1.7:compile [INFO] \- junit:junit:jar:4.11:test [INFO] \- org.hamcrest:hamcrest-core:jar:1.3:test [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.240s [INFO] Finished at: Fri Feb 22 18:07:55 CET 2013 [INFO] Final Memory: 5M/81M [INFO] ------------------------------------------------------------------------ 

mvn版本：

 Apache Maven 3.0.3 (r1075438; 2011-02-28 18:31:09+0100) Maven home: /usr/share/maven Java version: 1.6.0_41, vendor: Apple Inc. Java home: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home Default locale: de_CH, platform encoding: MacRoman OS name: "mac os x", version: "10.8.2", arch: "x86_64", family: "mac" 

请注意，我不是java或maven的专家，只是刚开始（尤其是maven）。 从我从其他文章和问题中看到的，我应该在src/test/java ，在src/main/java “真正的”代码 – 我这样做了。

我也删除了整个〜/ .m2 /文件夹，它仍然无法正常工作。

我也运行了mvn test -X但它没有帮助我。 如果我发布它请告诉我。

Answer 1

除非您有充分的理由，否则不应覆盖POM的元素中的设置。 此属性确定Maven查找非测试代码的位置。 此属性的默认值为src/main/java 。 属性设置测试代码的路径（默认为src/test/java 。通过将设置为src ，Maven认为整个目录包含主应用程序代码。由于src目录包含src/test/java ，Maven然后尝试编译您的测试代码作为主应用程序的一部分。

这很重要，因为在编译主应用程序时（在compile阶段），Maven省略了与test范围的依赖关系。 在主编译之后，测试代码在单独的阶段（ test-compile阶段）中编译。

因此，由于Maven尝试将测试代码编译为主应用程序的一部分，因此它省略了junit依赖项，并且它们在类路径中不可用。 这里的解决方案是不在POM中指定元素。

Answer 2

默认情况下，maven分别查看这些文件夹中的java和测试类 – src / main / java和src / test / java

当在源代码下使用测试类指定src并且在pom.xml中提到junit依赖的范围时，maven将找不到test-org.unit。