CordaRPCJavaClientTest refactoring to align with enterprise repo. (co…

…rda#2299)

* Align CordaRPCJavaClientTest with Kotlin version of the test ((byte)0 instead of "1".getBytes())
* Refactoring to align with enterprise repo (exceptions).

client/rpc/src/integration-test/java/net/corda/client/rpc/CordaRPCJavaClientTest.java

@@ -55,7 +55,7 @@ private void login(String username, String password) {
     }
 
     @Before
-    public void setUp() throws ExecutionException, InterruptedException {
+    public void setUp() throws Exception {
         node = startNode(ALICE_NAME, 1, singletonList(rpcUser));
         client = new CordaRPCClient(requireNonNull(node.getInternals().getConfiguration().getRpcAddress()));
     }
@@ -71,11 +71,11 @@ public void testLogin() {
     }
 
     @Test
-    public void testCashBalances() throws NoSuchFieldException, ExecutionException, InterruptedException {
+    public void testCashBalances() throws ExecutionException, InterruptedException {
         login(rpcUser.getUsername(), rpcUser.getPassword());
 
         FlowHandle<AbstractCashFlow.Result> flowHandle = rpcProxy.startFlowDynamic(CashIssueFlow.class,
-                DOLLARS(123), OpaqueBytes.of("1".getBytes()),
+                DOLLARS(123), OpaqueBytes.of((byte)0),
                 CoreTestUtils.chooseIdentity(node.getInfo()));
         System.out.println("Started issuing cash, waiting on result");
         flowHandle.getReturnValue().get();