Mvn test: how to get classpath when starting another VM?

[hbf <fi...@inf.ethz.ch>]

Dear list,

I have a unit test that uses Java's Runtime.exec() method to start another
VM and execute code in it. I need this to test recovery from simulated power
failure. The code that should run in the VM is a test case itself, from the
same project. I do not know what classpath to pass to the exec command:

  Runtime.exec("java -classpath "\"" + System.getProperty("java.class.path")
+ "\" " + MyUnitTest.getCanonicalName());

This works from within Eclipse but not if I do a 'mvn test'.

How can I obtain a classpath from Maven that I can use to start the separate
VM?

Thanks for any pointers,
Kaspar

P.S. What I want to do is write a unit test that runs some code which
simulates a power failure by calling System.exit(). Then the unit test
continues by restarting the app and checking that recovery works. To
accomplish this, I wrote a unit test that uses – as described above
– Runtime.exec() to launch the code that does some work and then exit()'s.
But I don't manage get this to run due to the above classpath issues.
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Re: Mvn test: how to get classpath when starting another VM?

[Nick Stolwijk <ni...@gmail.com>]

I don't know if this is working, but give it a try:

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.4.2</version>
        <configuration>
          <systemProperties>
            <property>
              <name>myClasspath</name>
              <value>${classpathElements}</value>
            </property>
          </systemProperties>
        </configuration>
      </plugin>

And then in your code:

System.getProperty("myClasspath")

Perhaps you have to do some postprocessing on the String, but this is
how the maven-surefire-plugin gets it classpath.

http://svn.apache.org/viewvc/maven/surefire/tags/surefire-2.4.3/maven-surefire-plugin/src/main/java/org/apache/maven/plugin/surefire/SurefirePlugin.java?view=markup

Hth,

Nick Stolwijk
~Java Developer~

Iprofs BV.
Claus Sluterweg 125
2012 WS Haarlem
www.iprofs.nl



On Thu, Apr 16, 2009 at 12:45 AM, hbf <fi...@inf.ethz.ch> wrote:
> System.getProperty("java.class.path")
> + "\" " + MyUnitTest.getCanonicalName());

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