Maven doesn't find org.junit even though it

I wanted to add a test to my small project (please note I removed some bits from the code & changed package names, so if there's any error you see regarding this it might be not this ;)):

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);
    }

}

(I also tried to extend from TestCase in order to remove the static import but it didn't help)

After running mvn test it shows me an error that it couldn't find 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, i.e. 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, i.e. 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

My pom.xml looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>TestServer</name>
    <description>Test</description>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <!-- Facebook library -->
        <dependency>
            <groupId>com.restfb</groupId>
            <artifactId>restfb</artifactId>
            <version>1.6.11</version>
        </dependency>
        <!-- Gson: Java to Json conversion -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.2.2</version>
            <scope>compile</scope>
        </dependency>
        <!-- Tigase server snapshot -->
        <dependency>
            <groupId>tigase</groupId>
            <artifactId>tigase-server</artifactId>
            <version>5.2.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.7</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <repositories>
        <repository>
            <id>tigase</id>
            <name>Tigase repository</name>
            <url>http://maven.tigase.org</url>
        </repository>
        <repository>
            <id>tigase-snapshot</id>
            <name>Tigase repository</name>
            <url>http://build.xmpp-test.net/maven/</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

mvn dependency:tree:

[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 version:

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"

Please note that I'm not an expert in java nor in maven, just getting started (especially with maven). From what I've seen from other articles and questions, I should have my tests within src/test/java and my "real" code within src/main/java - I have done it like this.

Also I removed once the whole ~/.m2/ folder and it still didn't work.

I also did run mvn test -X but it didn't help me. If I should post it please tell me so.

回答1:

You shouldn't override your <sourceDirectory> setting in the POM's <build> element unless you have a good reason to. This attribute determines where Maven looks for non-test code. The default value for this attribute is src/main/java. The <testSourceDirectory> attribute sets the path to test code (this defaults to src/test/java. By setting the <sourceDirectory> to simply src, Maven considers that entire directory to contain main application code. Since the src directory contains src/test/java, Maven then tries to compile your test code as part of the main application.

This is significant because when compiling the main application (during the compile phase), Maven omits dependencies with test scope. Test code is compiled in a separate phase (the test-compile phase) after the main compile.

So since Maven tried to compile your test code as part of the main application, it omitted the junit dependency, and they weren't available on the classpath. The solution here is to simply not specify the <sourceDirectory> element in the POM.

回答2:

By default , maven looks at these folders for java and test classes respectively - src/main/java and src/test/java

When the src is specified with the test classes under source and the scope for junit dependency in pom.xml is mentioned as test - org.unit will not be found by maven.