Factorial example fails

```
1. Reproduced the Factorial example
2. Run:
mvn exec:java -Dexec.mainClass="com.google.caliper.runner.CaliperMain"
-Dexec.args="benchmark.FactorialBenchmark"

All experiments fail with:

[INFO] Scanning for projects...
[INFO]
[INFO] Using the builder
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder
with a thread count of 1
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Benchmark 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.3.2:java (default-cli) @ benchmark ---
[WARNING] Warning: killAfter is now deprecated. Do you need it ? Please comment
on MEXEC-6.
Experiment selection:
Instruments: [allocation, runtime]
User parameters: {number=[5, 10, 20]}
Virtual machines: [default]
Selection type: Full cartesian product

This selection yields 12 experiments.
Starting trial 1 of 12: {instrument=allocation, benchmarkMethod=iterative,
vm=default, parameters={number=5}}à ERROR: Trial failed to complete (its
results will not be included in the run):
...

Windows 7-64 / latest master

```

Original issue reported on code.google.com by `soro...@gmail.com` on 17 Nov 2014 at 11:17