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From Yang <teddyyyy...@gmail.com>
Subject weird thread count diff on maven vs command line java
Date Fri, 26 Aug 2011 16:43:01 GMT
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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