fix: handle FeeEstimateQuery failures and avoid duplicate transactions

Signed-off-by: imshubham22apr-gif <imshubham.22apr@gmail.com>

Author: imshubham22apr-gif

examples/src/main/java/com/hedera/hashgraph/sdk/examples/FeeEstimateQueryExample.java

@@ -61,7 +61,11 @@ public static void main(String[] args) throws Exception {
         TransferTransaction tx = createTransferTransaction(client, recipientId);
         FeeEstimateResponse stateEstimate = estimateWithStateMode(client, tx);
         FeeEstimateResponse intrinsicEstimate = estimateWithIntrinsicMode(client, tx);
-        compareEstimates(stateEstimate, intrinsicEstimate);
+        if (stateEstimate != null && intrinsicEstimate != null) {
+            compareEstimates(stateEstimate, intrinsicEstimate);
+        } else {
+            System.out.println("\n=== Skipping Comparison due to missing estimate ===");
+        }
         demonstrateTokenCreationEstimate(client);
 
         client.close();
@@ -100,18 +104,24 @@ private static TransferTransaction createTransferTransaction(Client client, Acco
     private static FeeEstimateResponse estimateWithStateMode(Client client, TransferTransaction tx) throws Exception {
         System.out.println("\n=== Estimating Fees with STATE Mode ===");
 
-        FeeEstimateResponse stateEstimate = new FeeEstimateQuery()
-                .setMode(FeeEstimateMode.STATE)
-                .setTransaction(tx)
-                .execute(client);
-
-        printNetworkFee(stateEstimate);
-        printNodeFee(stateEstimate);
-        printServiceFee(stateEstimate);
-        printTotalFee(stateEstimate);
-        System.out.println("\nHigh Volume Multiplier: " + stateEstimate.getHighVolumeMultiplier());
-
-        return stateEstimate;
+        try {
+            FeeEstimateResponse stateEstimate = new FeeEstimateQuery()
+                    .setMode(FeeEstimateMode.STATE)
+                    .setTransaction(tx)
+                    .execute(client);
+
+            printNetworkFee(stateEstimate);
+            printNodeFee(stateEstimate);
+            printServiceFee(stateEstimate);
+            printTotalFee(stateEstimate);
+            System.out.println("\nHigh Volume Multiplier: " + stateEstimate.getHighVolumeMultiplier());
+
+            return stateEstimate;
+        } catch (IllegalStateException e) {
+            System.err.println("Failed to estimate fees with STATE mode: " + e.getMessage());
+            System.err.println("This might be due to compatibility issues with the Mirror Node version.");
+            return null;
+        }
     }
 
     private static void printNetworkFee(FeeEstimateResponse estimate) {
@@ -187,12 +197,16 @@ private static void demonstrateTokenCreationEstimate(Client client) throws Excep
                 .freezeWith(client)
                 .signWithOperator(client);
 
-        FeeEstimateResponse tokenEstimate = new FeeEstimateQuery()
-                .setMode(FeeEstimateMode.STATE)
-                .setTransaction(tokenTx)
-                .execute(client);
+        try {
+            FeeEstimateResponse tokenEstimate = new FeeEstimateQuery()
+                    .setMode(FeeEstimateMode.STATE)
+                    .setTransaction(tokenTx)
+                    .execute(client);
 
-        System.out.println("Token Creation Estimated Fee:  " + tokenEstimate.getTotal() + " tinycents");
-        System.out.println("Token Creation Estimated Fee: " + Hbar.fromTinybars(tokenEstimate.getTotal() / 100));
+            System.out.println("Token Creation Estimated Fee:  " + tokenEstimate.getTotal() + " tinycents");
+            System.out.println("Token Creation Estimated Fee: " + Hbar.fromTinybars(tokenEstimate.getTotal() / 100));
+        } catch (IllegalStateException e) {
+            System.err.println("Failed to estimate token creation fees: " + e.getMessage());
+        }
     }
 }

sdk/src/testIntegration/java/com/hedera/hashgraph/sdk/test/integration/ContractFunctionParametersIntegrationTest.java

@@ -2835,6 +2835,8 @@ void canCallContractFunctionInt200Min() throws Exception {
     void canCallContractFunctionInt200Max() throws Exception {
         BigInteger int200Max = new BigInteger("803469022129495137770981046170581301261101496891396417650687");
 
+        Thread.sleep(10); // Avoid DUPLICATE_TRANSACTION
+
         var response = new ContractCallQuery()
                 .setContractId(contractId)
                 .setGas(30_000)