diff --git a/core/src/main/java/com/google/bitcoin/testing/FakeTxBuilder.java b/core/src/main/java/com/google/bitcoin/testing/FakeTxBuilder.java
index 83123435..91093584 100644
--- a/core/src/main/java/com/google/bitcoin/testing/FakeTxBuilder.java
+++ b/core/src/main/java/com/google/bitcoin/testing/FakeTxBuilder.java
@@ -26,8 +26,7 @@ import java.math.BigInteger;
 import java.nio.ByteBuffer;
 
 public class FakeTxBuilder {
-    public static Transaction createFakeTxWithChangeAddress(NetworkParameters params, BigInteger nanocoins, Address to, Address changeOutput)
-            throws IOException, ProtocolException {
+    public static Transaction createFakeTxWithChangeAddress(NetworkParameters params, BigInteger nanocoins, Address to, Address changeOutput) {
         // Create a fake TX of sufficient realism to exercise the unit tests. Two outputs, one to us, one to somewhere
         // else to simulate change.
         Transaction t = new Transaction(params);
@@ -46,11 +45,11 @@ public class FakeTxBuilder {
         return roundTripTransaction(params, t);
     }
 
-    public static Transaction createFakeTx(NetworkParameters params, BigInteger nanocoins, Address to) throws IOException, ProtocolException {
+    public static Transaction createFakeTx(NetworkParameters params, BigInteger nanocoins, Address to) {
         return createFakeTxWithChangeAddress(params, nanocoins, to, new ECKey().toAddress(params));
     }
 
-    public static Transaction createFakeTx(NetworkParameters params, BigInteger nanocoins, ECKey to) throws IOException, ProtocolException {
+    public static Transaction createFakeTx(NetworkParameters params, BigInteger nanocoins, ECKey to) {
         // Create a fake TX of sufficient realism to exercise the unit tests. Two outputs, one to us, one to somewhere
         // else to simulate change.
         Transaction t = new Transaction(params);
@@ -73,7 +72,7 @@ public class FakeTxBuilder {
      * @return Transaction[] Transaction[0] is a feeder transaction, supplying BTC to Transaction[1]
      */
     public static Transaction[] createFakeTx(NetworkParameters params, BigInteger nanocoins,
-                                             Address to, Address from) throws IOException, ProtocolException {
+                                             Address to, Address from) {
         // Create fake TXes of sufficient realism to exercise the unit tests. This transaction send BTC from the
         // from address, to the to address with to one to somewhere else to simulate change.
         Transaction t = new Transaction(params);
@@ -103,11 +102,15 @@ public class FakeTxBuilder {
     /**
      * Roundtrip a transaction so that it appears as if it has just come from the wire
      */
-    public static Transaction roundTripTransaction(NetworkParameters params, Transaction tx) throws IOException, ProtocolException {
-        BitcoinSerializer bs = new BitcoinSerializer(params);
-        ByteArrayOutputStream bos = new ByteArrayOutputStream();
-        bs.serialize(tx, bos);
-        return (Transaction) bs.deserialize(ByteBuffer.wrap(bos.toByteArray()));
+    public static Transaction roundTripTransaction(NetworkParameters params, Transaction tx) {
+        try {
+            BitcoinSerializer bs = new BitcoinSerializer(params);
+            ByteArrayOutputStream bos = new ByteArrayOutputStream();
+            bs.serialize(tx, bos);
+            return (Transaction) bs.deserialize(ByteBuffer.wrap(bos.toByteArray()));
+        } catch (IOException e) {
+            throw new RuntimeException(e);   // Should not happen.
+        }
     }
 
     public static class DoubleSpends {