From Maven, how do I run a class that lives under src/test/java?
I have inherited a codebase :)
Under src/test/java/ there's a file that I need to run (I need to run its public static void main(String[] args)
, not a @Test
method within it).
The closest I have got is:
mvn -e exec:java -Dexec.mainClass="com.me.packagex.RunFile" -Dexec.classpathScope="test"
but that then fails, and it appears to be because RunFile wants to use classes that exist under src/main/java/com/me/packagex/ (notice, /main/, not /test/). The files under there are in the same package as RunFile, i.e. 'package com.me.packagex;'.
If I remove the -Dexec.classpathScope="test"
then it can't find RunFile at all. It's as if I need to give it two scopes, but it doesn't accept "test,compile".
The person I've inherited this from (dearly departed) used to run it from Eclipse. I need a way to run it from the command-line.
I hope this is clearly explained.
tyvm,
This is promising. Pascal, I've tried your example and that doesn't work for me.
Although now I look at it - it's not finding Demo, rather than not finding Dog.
Apache Maven 2.2.1 (rdebian-1)
Java version: 1.6.0_18
Java home: /usr/lib/jvm/java-6-openjdk/jre
Default locale: en_GB, platform encoding: UTF-8
OS name: "linux" version: "2.6.32-25-generic" arch: "i386" Family: "unix"
$ mvn -e exec:java -Dexec.mainClass="com.stackoverflow.Demo" -Dexec.classpathScope="test"
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] An exception occured while executing the Java class. com.stackoverflow.Demo
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: An exception occured while executing the Java class. com.stackoverflow.Demo
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.MojoExecutionException: An exception occured while executing the Java class. com.stackoverflow.Demo
at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:346)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
... 17 more
Caused by: java.lang.ClassNotFoundException: com.stackoverflow.Demo
at java.net.URLC开发者_开发知识库lassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:284)
at java.lang.Thread.run(Thread.java:619)
I faced the same problem and figured it out.
Shortly speaking, the class must be compiled before exec:java
goal. (It surely works without test-compile
phase if the class is already compiled by other user action. Note that Pascal Thivent, in his answer, invoked mvn test
before exec:java
.)
$ mvn -Dexec.mainClass=... -Dexec.classpathScope=test test-compile exec:java
You can prove it for yourself if you want to see the ClassNotFoundException
again.
$ mvn -Dexec.mainClass=... -Dexec.classpathScope=test clean exec:java
Include following lines in pom.xml in exec-maven-plugin plugin. <classpathScope>test</classpathScope>
plugin section in POM looks something like this
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<executions>
<execution>
<id>my-execution</id>
<phase>test</phase>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>com.example.MainClass</mainClass>
<classpathScope>test</classpathScope>
</configuration>
</plugin>
Note : com.example.MainClass is the class containing main method.
(...) I hope this is clearly explained.
Not bad but I can't reproduce. I created a project:
$ mvn archetype:generate -DgroupId=com.stackoverflow \ -DartifactId=Q4060613 \ -Dversion=1.0-SNAPSHOT \ -DarchetypeArtifactId=maven-archetype-quickstart
Then cd
ed into it and created a Dog
class (under src/main/java
):
$ cd Q4060613
$ cat > src/main/java/com/stackoverflow/Dog.java
package com.stackoverflow;
public class Dog {
public String bark() {
return "woof!";
}
}
and created a Demo
class (under src/test/java
):
$ cat > src/test/java/com/stackoverflow/Demo.java
package com.stackoverflow;
public class Demo {
public static void main(String[] args) {
System.out.println(new Dog().bark());
}
}
After compiling the source code, running the command you provided works as expected:
$ mvn test ... $ mvn exec:java -Dexec.mainClass="com.stackoverflow.Demo" -Dexec.classpathScope="test" [INFO] Scanning for projects... ... [INFO] --- exec-maven-plugin:1.2:java (default-cli) @ Q4060613 --- woof! [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ ...
Something else must be wrong.
Ok, spurred on by it working for everyone else I dug a little harder. The code wasn't reporting its problems very well and I was misreading the stacktrace.
It does:
FileInputStream is = new FileInputStream("lib/other-thing.jar");
which was failing. I symlinked trunk/src/main/assembly/lib/ into trunk/ and now it works. There might be a neater way to fix that then the symlink, though.
Thank you chaps.
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