Most likely this is because you're using the maven pid instead of the pid of
the forked process running your unit test.
Maven forks a subprocess to run your unit tests by default.
On 27/08/2011, at 2:43 AM, Yang wrote:
> I have the following simple code
>
>
>
> import java.util.concurrent.*;
>
> import org.junit.*;
>
> /* test whether priorityBlockingQueue provides fairness
> *
> */
> public class BlahTest {
>
> @Test
> public void blahTest() throws Exception {
> ExecutorService exec = Executors.newCachedThreadPool();
> for(int i=0;i<100;i++) {
> exec.submit(
> new Thread() {
> public void run() {
>
> try {
> Thread.sleep(10000000);
> } catch (InterruptedException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> }
> }
> );
> }
>
> Thread.sleep(30000);
> exec.shutdown();
> }
> }
>
>
>
>
> if I run this with "maven test", and I do a jstack, I see only 5
> threads in the pool, instead of the 100 that I'm expecting. indeed if
> I run it with java -cp MY_CP:blah:blah org.junit.runner.JUnitCore
> BlahTest
>
> then jstack does show 100 threads
>
>
> why is this?
>
> the pom.xml is attached here if you want to test it out
>
>
> <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/maven-v4_0_0.xsd";>
> <modelVersion>4.0.0</modelVersion>
> <artifactId>blah</artifactId>
> <groupId>blah</groupId>
> <packaging>jar</packaging>
> <version>0</version>
> <name>blah</name>
>
> <build>
> <plugins>
> <plugin>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-compiler-plugin</artifactId>
> <configuration>
> <source>1.6</source>
> <target>1.6</target>
> </configuration>
> </plugin>
> </plugins>
> </build>
>
> <dependencies>
> <dependency>
> <groupId>junit</groupId>
> <artifactId>junit</artifactId>
> <version>4.8.2</version>
> <scope>test</scope>
> </dependency>
> </dependencies>
> </project>
>
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