add empty constructors for easier testing

host-cache/src/main/groovy/com/muwire/hostcache/HostPool.groovy

@@ -10,6 +10,7 @@ class HostPool {
     def verified = new HashMap()
     def unverified = new HashMap()
     
+	HostPool() {}
     HostPool(maxFailures, maxAge) {
         this.maxAge = maxAge
         this.maxFailures = maxFailures

host-cache/src/main/groovy/com/muwire/hostcache/Pinger.groovy

@@ -7,13 +7,12 @@ import net.i2p.client.datagram.I2PDatagramMaker
 class Pinger {
     
     final def session
-    final def maker
     Pinger(session) {
         this.session = session
-        this.maker = new I2PDatagramMaker(session)
     }
     
     def ping(host, uuid) {
+    	def maker = new I2PDatagramMaker(session)
         def payload = new HashMap()
         payload.type = "CrawlerPing"
         payload.version = 1