diff --git a/networking/src/main/kotlin/ch/dissem/bitmessage/networking/nio/NioNetworkHandler.kt b/networking/src/main/kotlin/ch/dissem/bitmessage/networking/nio/NioNetworkHandler.kt
index fff2d2b..01ef19f 100644
--- a/networking/src/main/kotlin/ch/dissem/bitmessage/networking/nio/NioNetworkHandler.kt
+++ b/networking/src/main/kotlin/ch/dissem/bitmessage/networking/nio/NioNetworkHandler.kt
@@ -34,6 +34,7 @@ import ch.dissem.bitmessage.utils.Property
 import ch.dissem.bitmessage.utils.ThreadFactoryBuilder.Companion.pool
 import ch.dissem.bitmessage.utils.UnixTime.now
 import org.slf4j.LoggerFactory
+import java.io.Closeable
 import java.io.IOException
 import java.net.InetAddress
 import java.net.InetSocketAddress
@@ -53,7 +54,8 @@ class NioNetworkHandler : NetworkHandler, InternalContext.ContextHolder {
         pool("network")
             .lowPrio()
             .daemon()
-            .build())
+            .build()
+    )
 
     private lateinit var ctx: InternalContext
     private var selector: Selector? = null
@@ -72,9 +74,11 @@ class NioNetworkHandler : NetworkHandler, InternalContext.ContextHolder {
         return threadPool.submit(Callable<Void> {
             SocketChannel.open(InetSocketAddress(server, port)).use { channel ->
                 channel.configureBlocking(false)
-                val connection = Connection(ctx, SYNC,
+                val connection = Connection(
+                    ctx, SYNC,
                     NetworkAddress.Builder().ip(server).port(port).stream(1).build(),
-                    HashMap(), timeoutInSeconds)
+                    HashMap(), timeoutInSeconds
+                )
                 while (channel.isConnected && !connection.isSyncFinished) {
                     write(channel, connection.io)
                     read(channel, connection.io)
@@ -216,7 +220,8 @@ class NioNetworkHandler : NetworkHandler, InternalContext.ContextHolder {
                                         try {
                                             val accepted = (key.channel() as ServerSocketChannel).accept()
                                             accepted.configureBlocking(false)
-                                            val connection = Connection(ctx, SERVER,
+                                            val connection = Connection(
+                                                ctx, SERVER,
                                                 NetworkAddress(
                                                     time = now,
                                                     stream = 1L,
@@ -281,7 +286,8 @@ class NioNetworkHandler : NetworkHandler, InternalContext.ContextHolder {
                             if (selectionKey.isValid
                                 && selectionKey.interestOps() and OP_WRITE == 0
                                 && selectionKey.interestOps() and OP_CONNECT == 0
-                                && !connection.nothingToSend) {
+                                && !connection.nothingToSend
+                            ) {
                                 selectionKey.interestOps(OP_READ or OP_WRITE)
                             }
                         } catch (x: CancelledKeyException) {
@@ -338,10 +344,18 @@ class NioNetworkHandler : NetworkHandler, InternalContext.ContextHolder {
     }
 
     override fun stop() {
-        serverChannel?.socket()?.close()
-        selector?.close()
+        tryClose(serverChannel?.socket())
+        tryClose(selector)
         for (selectionKey in connections.values) {
-            selectionKey.channel().close()
+            tryClose(selectionKey.channel())
+        }
+    }
+
+    private fun tryClose(item: Closeable?) {
+        try {
+            item?.close()
+        } catch (e: IOException) {
+            LOG.debug(e.message, e)
         }
     }
 
@@ -382,7 +396,8 @@ class NioNetworkHandler : NetworkHandler, InternalContext.ContextHolder {
                     }
                 }
                 if (connection.knowsOf(next) && !connection.requested(next)) {
-                    val ivs = distribution[connection] ?: throw IllegalStateException("distribution not available for $connection")
+                    val ivs = distribution[connection]
+                        ?: throw IllegalStateException("distribution not available for $connection")
                     if (ivs.size == GetData.MAX_INVENTORY_SIZE) {
                         connection.send(GetData(ivs))
                         ivs.clear()
@@ -406,7 +421,8 @@ class NioNetworkHandler : NetworkHandler, InternalContext.ContextHolder {
         }
 
         for (connection in distribution.keys) {
-            val ivs = distribution[connection] ?: throw IllegalStateException("distribution not available for $connection")
+            val ivs =
+                distribution[connection] ?: throw IllegalStateException("distribution not available for $connection")
             if (!ivs.isEmpty()) {
                 connection.send(GetData(ivs))
             }
@@ -434,12 +450,16 @@ class NioNetworkHandler : NetworkHandler, InternalContext.ContextHolder {
         for (stream in streams) {
             val incoming = incomingConnections[stream] ?: 0
             val outgoing = outgoingConnections[stream] ?: 0
-            streamProperties.add(Property("stream " + stream, Property("nodes", incoming + outgoing),
-                Property("incoming", incoming),
-                Property("outgoing", outgoing)
-            ))
+            streamProperties.add(
+                Property(
+                    "stream " + stream, Property("nodes", incoming + outgoing),
+                    Property("incoming", incoming),
+                    Property("outgoing", outgoing)
+                )
+            )
         }
-        return Property("network",
+        return Property(
+            "network",
             Property("connectionManager", if (isRunning) "running" else "stopped"),
             Property("connections", streamProperties),
             Property("requestedObjects", requestedObjects.size)
diff --git a/repositories/src/test/kotlin/ch/dissem/bitmessage/repository/TestJdbcConfig.kt b/repositories/src/test/kotlin/ch/dissem/bitmessage/repository/TestJdbcConfig.kt
index c5c9ec6..1fa4501 100644
--- a/repositories/src/test/kotlin/ch/dissem/bitmessage/repository/TestJdbcConfig.kt
+++ b/repositories/src/test/kotlin/ch/dissem/bitmessage/repository/TestJdbcConfig.kt
@@ -17,7 +17,6 @@
 package ch.dissem.bitmessage.repository
 
 import org.h2.tools.Server
-import org.slf4j.LoggerFactory
 
 /**
  * JdbcConfig to be used for tests. Uses an in-memory database and adds a useful [.reset] method resetting