Findbugs: A stab at squashing some issues across the board. Probably more to follow.

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/irc/IRCFilter.java

...unnel/java/src/net/i2p/i2ptunnel/socks/SOCKS4aServer.java

...tunnel/java/src/net/i2p/i2ptunnel/socks/SOCKS5Server.java

...reaming/java/src/net/i2p/client/streaming/PcapWriter.java

core/java/src/net/i2p/util/Log.java

router/java/src/net/i2p/router/Blocklist.java

...et/i2p/router/networkdb/kademlia/FloodfillMonitorJob.java

router/java/src/net/i2p/router/transport/UPnP.java