Running a class file through "mvn exec:exec"

Question

I am new to maven and facing problems while running a class file through maven

It runs fine with
mvn exec:java -Dexec.mainClass="com.test.Test"

But not with
mvn exec:exec -Dexec.executable=java -Dexec.mainClass="com.test.Test"

It asks for java parameters

F:\data\work\Test>mvn exec:exec -Dexec.executable=java -Dexec.mainClass="com.test.Test"
Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
    -d32          use a 32-bit data model if available
    -d64          use a 64-bit data model if available
    -server       to select the "server" VM
    -hotspot      is a synonym for the "server" VM  [deprecated]
                  The default VM is server.

    -cp <class search path of directories and zip/jar files>
    -classpath <class search path of directories and zip/jar files>
                  A ; separated list of directories, JAR archives,
                  and ZIP archives to search for class files.

I am already providing a class file then why its not able to pick that? I tried providing those even through pom.

I am using exec:exec as I dont want to pass VM arguments from MAVEN_OPTS

here is my pom

<profiles>  
 <profile>  
  <id>fib</id>  
  <build>  
   <plugins>  
    <plugin>  
     <groupId>org.codehaus.mojo</groupId>  
     <artifactId>exec-maven-plugin</artifactId>  
     <version>1.3.2</version>  
     <executions>  
      <execution>  
       <phase>test</phase>  
       <goals>  
        <goal>exec</goal>  
       </goals>  
       <configuration>  
        <mainClass>com.test.Test</mainClass>  
        <executable>java</executable> 
       </configuration>  
      </execution>  
     </executions>  
    </plugin>  
   </plugins>  
  </build>  
 </profile>  
</profiles>

What am I missing?

So 2 questions which arises -
1)What am I missing s that its asking me to pass java parameters despite of passing mainClass?
2)How can I pass VM arguments using exec-maven-plugin?

I have found this for my 2nd question using maven 'exec:exec' with arguments

@JigarJoshi Its running with mvn exec:java -Dexec.mainClass="com.test.Test", but I want to VM arguments but not by MAVEN_OPTS — Ravi Sahu, Dec 17 '14 at 04:55
@JigarJoshi there are 2 problems here **1)how can i pass parameters to java, see it asked me to pass java parameters?**
**2) how can i pass arguments?** — Ravi Sahu, Dec 17 '14 at 05:02
you mean command line parameter to main or parameter to JVM itself, for JVM see my above comment — jmj, Dec 17 '14 at 05:03
@JigarJoshi - I mean arguments to JVM, also do check my pom i think its not correct — Ravi Sahu, Dec 17 '14 at 05:04
can you try this once `mvn exec:java -DmainClass="com.text.Test" -Dexec.args="-X_____"` — jmj, Dec 17 '14 at 05:38
It is `mvn exec:java -Dexec.mainClass="com.test.Test" -Dexec.args="-XX:+PrintGCDetails"` — Ravi Sahu, Dec 17 '14 at 05:42
yes [right](http://mojo.codehaus.org/exec-maven-plugin/usage.html), doesn;t it work ? — jmj, Dec 17 '14 at 05:43
yes it works but `-XX:+PrintGCDetails` part dose not worked, i want to see GC logs — Ravi Sahu, Dec 17 '14 at 05:45
can you from your main class print all system property to see actually it gets passed to JVM ? — jmj, Dec 17 '14 at 05:46
it get passed i can see in output with other system properties `exec.args=-XX:+PrintGCDetails`. I guess its not applied to JVM because `exec:java execute Java programs in the same VM.` — Ravi Sahu, Dec 17 '14 at 05:59
that makes sense, but why that parameter then if it is going to run on same JVM :-/ — jmj, Dec 17 '14 at 06:05
check [http://mojo.codehaus.org/exec-maven-plugin/]. Thats why i was using exec:exec, it execute programs and Java programs in a separate process. — Ravi Sahu, Dec 17 '14 at 06:07
can you invoke `mvn exec:exex .... -X`` with `-X` to see what command it under the cover executes ? — jmj, Dec 17 '14 at 06:15
Already tried.. on `mvn exec:exec -Dexec.mainClass="com.test.Test" -Dexec.args="-XX:+PrintGCDetails" -X` prints `The parameters 'executable' for goal org.codehaus.mojo:exec-maven-plugin:1.3.2:exec are missing or invalid`,with lot of other unusefull lines(i think), check my pom now — Ravi Sahu, Dec 17 '14 at 06:21
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/67085/discussion-between-biker-and-jigar-joshi). — Ravi Sahu, Dec 17 '14 at 06:23

score 7 · Accepted Answer · edited Jan 18 '21 at 12:34

7

mvn exec:exec -Dexec.executable=java -Dexec.args="-classpath target/classes -XX:+PrintGCDetails com.test.Test"

also if you are concerned about dependencies being in classpath then make a fat jar and set it in classpath

interesting discussion: https://chat.stackoverflow.com/rooms/67085/discussion-between-biker-and-jigar-joshi

edited Jan 18 '21 at 12:34

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answered Dec 17 '14 at 06:57

jmj

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Thanks discussion was really helpful – Ravi Sahu Dec 17 '14 at 07:06

Running a class file through "mvn exec:exec"

1 Answers1