Improve exception handling

Author: alexsa

core/src/main/java/com/datastax/oss/driver/internal/core/ContactPoints.java

@@ -43,7 +43,7 @@ public static Set<EndPoint> merge(
       try {
         addresses = AddressUtils.extract(spec, resolve);
       } catch (RuntimeException e) {
-        LOG.warn("Ignoring invalid contact point {} ({})", spec, e.getMessage());
+        LOG.warn("Ignoring invalid contact point {} ({})", spec, e.getMessage(), e);
       }
 
       if (addresses.size() > 1) {

core/src/main/java/com/datastax/oss/driver/internal/core/addresstranslation/SubnetAddressTranslator.java

@@ -107,8 +107,10 @@ public String getPath() {
       };
 
   private final List<SubnetAddress> subnetAddresses;
+
   @SuppressWarnings("OptionalUsedAsFieldOrParameterType")
   private final Optional<InetSocketAddress> defaultAddress;
+
   private final String logPrefix;
 
   public SubnetAddressTranslator(@NonNull DriverContext context) {
@@ -172,7 +174,7 @@ private InetSocketAddress parseAddress(String address, boolean resolve) {
       return parsedAddress;
     } catch (RuntimeException e) {
       throw new IllegalArgumentException(
-          String.format("Invalid address %s (%s)", address, e.getMessage()));
+          String.format("Invalid address %s (%s)", address, e.getMessage()), e);
     }
   }
 

core/src/main/java/com/datastax/oss/driver/internal/core/util/AddressUtils.java

@@ -47,7 +47,7 @@ public static Set<InetSocketAddress> extract(String address, boolean resolve) {
       try {
         inetAddresses = InetAddress.getAllByName(host);
       } catch (UnknownHostException e) {
-        throw new RuntimeException("unknown host " + host, e);
+        throw new RuntimeException(e);
       }
       Set<InetSocketAddress> result = new HashSet<>();
       for (InetAddress inetAddress : inetAddresses) {