[MINOR] Fix warnings identified by static analysis. (#262)

ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/core/AbstractWorldUpdater.java

@@ -398,7 +398,7 @@ public abstract class AbstractWorldUpdater<W extends WorldView, A extends Accoun
       // may kill some of "their" updates, and our updates may review some of the account "they"
       // deleted.
       deletedAccounts().forEach(wrapped.updatedAccounts::remove);
-      updatedAccounts().forEach(a -> wrapped.deletedAccounts.remove(a.getAddressHash()));
+      updatedAccounts().forEach(a -> wrapped.deletedAccounts.remove(a.getAddress()));
 
       // Then push our deletes and updates to the stacked ones.
       wrapped.deletedAccounts.addAll(deletedAccounts());
@@ -411,7 +411,7 @@ public abstract class AbstractWorldUpdater<W extends WorldView, A extends Accoun
           existing = update.getWrappedAccount();
           if (existing == null) {
             // Brand new account, create our own version
-            existing = new UpdateTrackingAccount<A>(update.address);
+            existing = new UpdateTrackingAccount<>(update.address);
           }
           wrapped.updatedAccounts.put(existing.address, existing);
         }

ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/mainnet/EthHashCacheFactory.java

@@ -45,7 +45,7 @@ public class EthHashCacheFactory {
   Cache<Long, EthHashDescriptor> descriptorCache = CacheBuilder.newBuilder().maximumSize(5).build();
 
   public EthHashDescriptor ethHashCacheFor(final long blockNumber) {
-    final Long epochIndex = EthHash.epoch(blockNumber);
+    final long epochIndex = EthHash.epoch(blockNumber);
     try {
       return descriptorCache.get(epochIndex, () -> createHashCache(epochIndex, blockNumber));
     } catch (final ExecutionException ex) {

ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/mainnet/EthHasher.java

@@ -75,9 +75,9 @@ public interface EthHasher {
               headerHash,
               datasetSize,
               nonce,
-              (bytes, integer) -> {
+              (bytes, offset) -> {
                 try {
-                  cacheFile.seek(integer * EthHash.HASH_BYTES);
+                  cacheFile.seek(((long) offset) * EthHash.HASH_BYTES);
                   cacheFile.readFully(bytes);
                 } catch (final IOException ex) {
                   throw new IllegalStateException(ex);

ethereum/eth/src/main/java/tech/pegasys/pantheon/ethereum/eth/manager/EthServer.java

@@ -34,12 +34,12 @@ import tech.pegasys.pantheon.ethereum.rlp.RLPException;
 import tech.pegasys.pantheon.util.bytes.BytesValue;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
 
+import com.google.common.collect.Lists;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -135,8 +135,8 @@ class EthServer {
       if (firstHeader == null) {
         resp = Collections.emptyList();
       } else {
-        resp = new ArrayList<>(Arrays.asList(firstHeader));
+        resp = Lists.newArrayList(firstHeader);
-        final int numberDelta = reversed ? -(skip + 1) : (skip + 1);
+        final long numberDelta = reversed ? -(skip + 1) : (skip + 1);
         for (int i = 1; i < maxHeaders; i++) {
           final long blockNumber = firstHeader.getNumber() + i * numberDelta;
           if (blockNumber < BlockHeader.GENESIS_BLOCK_NUMBER) {

ethereum/eth/src/main/java/tech/pegasys/pantheon/ethereum/eth/sync/tasks/PersistBlockTask.java

@@ -84,7 +84,7 @@ public class PersistBlockTask<C> extends AbstractEthTask<Block> {
                         successfulImports,
                         headerValidationMode));
       }
-      return future.thenApply((r) -> successfulImports);
+      return future.thenApply(r -> successfulImports);
     };
   }