@Override
  public PoolFactory setIdleTimeout(long idleTimout) {
    if (idleTimout < -1) {
      throw new IllegalArgumentException("idleTimeout must be greater than or equal to -1");
    }
    attributes.idleTimeout = idleTimout;
    return this;
  }
The cache that created this factory
geode-core/src/main/java/org/apache/geode/internal/cache/PoolFactoryImpl.java