define Default zero address

core/src/main/java/com/klaytn/caver/transaction/AbstractFeeDelegatedTransaction.java

@@ -170,7 +170,7 @@ public AbstractFeeDelegatedTransaction signAsFeePayer(AbstractKeyring keyring, i
      * @throws IOException
      */
     public AbstractFeeDelegatedTransaction signAsFeePayer(AbstractKeyring keyring, Function<AbstractFeeDelegatedTransaction, String> hasher) throws IOException {
-        if(this.getFeePayer().equals("0x")) {
+        if(this.getFeePayer().equals("0x") || this.getFeePayer().equals(Utils.DEFAULT_ZERO_ADDRESS)) {
             this.setFeePayer(keyring.getAddress());
         }
 
@@ -198,7 +198,7 @@ public AbstractFeeDelegatedTransaction signAsFeePayer(AbstractKeyring keyring, F
      * @throws IOException
      */
     public AbstractFeeDelegatedTransaction signAsFeePayer(AbstractKeyring keyring, int index, Function<AbstractFeeDelegatedTransaction, String> hasher) throws IOException {
-        if(this.getFeePayer().equals("0x")) {
+        if(this.getFeePayer().equals("0x") || this.getFeePayer().equals(Utils.DEFAULT_ZERO_ADDRESS)) {
             this.setFeePayer(keyring.getAddress());
         }
 
@@ -257,8 +257,8 @@ public String combineSignedRawTransactions(List<String> rlpEncoded) {
             if(fillVariable) {
                 if(this.getNonce().equals("0x")) this.setNonce(txObj.getNonce());
                 if(this.getGasPrice().equals("0x")) this.setGasPrice(txObj.getGasPrice());
-                if(this.getFeePayer().equals("0x")) {
-                    if(!txObj.getFeePayer().equals("0x")) {
+                if(this.getFeePayer().equals("0x") || this.getFeePayer().equals(Utils.DEFAULT_ZERO_ADDRESS)) {
+                    if(!txObj.getFeePayer().equals("0x") && !txObj.getFeePayer().equals(Utils.DEFAULT_ZERO_ADDRESS)) {
                         this.setFeePayer(txObj.getFeePayer());
                         fillVariable = false;
                     }
@@ -335,11 +335,11 @@ public String getFeePayer() {
      * @param feePayer The address of fee payer.
      */
     public void setFeePayer(String feePayer) {
-        if(feePayer == null) {
-            feePayer = "0x";
+        if(feePayer == null || feePayer.equals("0x")) {
+            feePayer = Utils.DEFAULT_ZERO_ADDRESS;
         }
 
-        if(!feePayer.equals("0x") && !Utils.isAddress(feePayer)) {
+        if(!Utils.isAddress(feePayer)) {
             throw new IllegalArgumentException("Invalid address. : " + feePayer);
         }
 
@@ -361,7 +361,7 @@ public void setFeePayerSignatures(List<SignatureData> feePayerSignatures) {
         }
 
         if(!Utils.isEmptySig(feePayerSignatures)) {
-            if (feePayer.equals("0x")) {
+            if (feePayer.equals("0x") || feePayer.equals(Utils.DEFAULT_ZERO_ADDRESS)) {
                 throw new IllegalArgumentException("feePayer is missing: feePayer must be defined with feePayerSignatures.");
             }
         }

core/src/main/java/com/klaytn/caver/transaction/AbstractTransaction.java

@@ -271,7 +271,7 @@ public AbstractTransaction sign(AbstractKeyring keyring, Function<AbstractTransa
             throw new IllegalArgumentException("A legacy transaction cannot be signed with a decoupled keyring.");
         }
 
-        if(this.from.equals("0x")){
+        if(this.from.equals("0x") || this.from.equals(Utils.DEFAULT_ZERO_ADDRESS)){
             this.from = keyring.getAddress();
         }
 
@@ -315,7 +315,7 @@ public AbstractTransaction sign(AbstractKeyring keyring, int index, Function<Abs
             throw new IllegalArgumentException("A legacy transaction cannot be signed with a decoupled keyring.");
         }
 
-        if(this.from.equals("0x")){
+        if(this.from.equals("0x") || this.from.equals(Utils.DEFAULT_ZERO_ADDRESS)){
             this.from = keyring.getAddress();
         }
 
@@ -621,7 +621,7 @@ public void setType(String type) {
     public void setFrom(String from) {
         //"From" field in LegacyTransaction allows null
         if(this instanceof LegacyTransaction) {
-            if(from == null || from.isEmpty() || from.equals("0x")) from = "0x";
+            if(from == null || from.isEmpty() || from.equals("0x") || from.equals(Utils.DEFAULT_ZERO_ADDRESS)) from = Utils.DEFAULT_ZERO_ADDRESS;
         } else {
             if(from == null) {
                 throw new IllegalArgumentException("from is missing.");

core/src/main/java/com/klaytn/caver/utils/Utils.java

@@ -34,6 +34,8 @@ public class Utils {
     public static final int LENGTH_ADDRESS_STRING = 40;
     public static final int LENGTH_PRIVATE_KEY_STRING = 64;
 
+    public static final String DEFAULT_ZERO_ADDRESS = "0x0000000000000000000000000000000000000000";
+
     /**
      * Check if string has address format.
      * @param address An address string.

core/src/test/java/com/klaytn/caver/common/transaction/FeeDelegatedAccountUpdateTest.java

@@ -1067,7 +1067,7 @@ public void combineSignatures() {
                     .setAccount(account)
                     .build();
 
-            String rlpEncoded = "0x21f872018505d21dba00830186a0949788016d3957e62cc7f3aa7f9f5d801e3277b4eb8201c0f847f845820fe9a05e5922bc693162599cca35416a96f44187a7a0ac4851eddf9ad8ec8359aa8878a03e128291576716d0be1ef5a8dba67eb2056fa1495529a77338d9c7a7b4c5e24a80c4c3018080";
+            String rlpEncoded = "0x21f886018505d21dba00830186a0949788016d3957e62cc7f3aa7f9f5d801e3277b4eb8201c0f847f845820fe9a05e5922bc693162599cca35416a96f44187a7a0ac4851eddf9ad8ec8359aa8878a03e128291576716d0be1ef5a8dba67eb2056fa1495529a77338d9c7a7b4c5e24a940000000000000000000000000000000000000000c4c3018080";
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncoded));
 
             SignatureData expectedSignatureData = new SignatureData(
@@ -1104,7 +1104,7 @@ public void combineSignature_multipleSignature() {
             };
 
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncodedStrings));
-            String expectedRLPEncoding = "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";
+            String expectedRLPEncoding = "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";
 
             SignatureData[] expectedSignatureData = new SignatureData[]{
                     new SignatureData(

core/src/test/java/com/klaytn/caver/common/transaction/FeeDelegatedAccountUpdateWithRatioTest.java

@@ -1174,7 +1174,7 @@ public void combineSignatures() {
                     .setFeeRatio(feeRatio)
                     .build();
 
-            String rlpEncoded = "0x22f873018505d21dba00830186a094610a4bf32905c1dc6e5e61c37165b9aa3a7189088201c01ef847f845820feaa03f34007147ba1c9184d51b7dfacae768ae00c859b4726ef339502e98d44ec188a03e518e277769ba02d57c8c7fab291abab61e2525735500402e78a1493e48781e80c4c3018080";
+            String rlpEncoded = "0x22f887018505d21dba00830186a094610a4bf32905c1dc6e5e61c37165b9aa3a7189088201c01ef847f845820feaa03f34007147ba1c9184d51b7dfacae768ae00c859b4726ef339502e98d44ec188a03e518e277769ba02d57c8c7fab291abab61e2525735500402e78a1493e48781e940000000000000000000000000000000000000000c4c3018080";
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncoded));
 
             SignatureData expectedSignatureData = new SignatureData(
@@ -1212,7 +1212,7 @@ public void combineSignature_multipleSignature() {
             };
 
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncodedStrings));
-            String expectedRLPEncoding = "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";
+            String expectedRLPEncoding = "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";
 
             SignatureData[] expectedSignatureData = new SignatureData[]{
                     new SignatureData(

core/src/test/java/com/klaytn/caver/common/transaction/FeeDelegatedCancelTest.java

@@ -745,7 +745,7 @@ public void combineSignatures() {
                     .setFrom(from)
                     .build();
 
-            String rlpEncoded = "0x39f86f018505d21dba00830dbba094dcad313f2bf2240dbdb243eaf5eee2f512e0bfd1f847f845820fe9a04d9bf7a8bd15a41143eeecd3c39691cdc151b50d641534f0c73055849f7abca1a07123185b4cc046eb6a78e1ee370c059dfe437012098ebe18379685acd907606f80c4c3018080";
+            String rlpEncoded = "0x39f883018505d21dba00830dbba094dcad313f2bf2240dbdb243eaf5eee2f512e0bfd1f847f845820fe9a04d9bf7a8bd15a41143eeecd3c39691cdc151b50d641534f0c73055849f7abca1a07123185b4cc046eb6a78e1ee370c059dfe437012098ebe18379685acd907606f940000000000000000000000000000000000000000c4c3018080";
 
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncoded));
 
@@ -783,7 +783,7 @@ public void combineSignature_MultipleSignature() {
             };
 
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncodedStrings));
-            String expectedRLPEncoding = "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";
+            String expectedRLPEncoding = "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";
 
             SignatureData[] expectedSignatureData = new SignatureData[]{
                     new SignatureData(

core/src/test/java/com/klaytn/caver/common/transaction/FeeDelegatedCancelWithRatioTest.java

@@ -896,7 +896,7 @@ public void combineSignatures() {
                     .setFeeRatio(feeRatio)
                     .build();
 
-            String rlpEncoded = "0x3af870018505d21dba00830249f094158a98f884e6f5a2731049569cb895cc1c75b47b1ef847f845820fe9a0879126759f424c790069e47d443c44674f4c2154d1e6f4f02134dbc56a6629f1a04b714b50c900b0b099b3e3ba15743654e8c576aa4fe504da38015f4c6175759080c4c3018080";
+            String rlpEncoded = "0x3af884018505d21dba00830249f094158a98f884e6f5a2731049569cb895cc1c75b47b1ef847f845820fe9a0879126759f424c790069e47d443c44674f4c2154d1e6f4f02134dbc56a6629f1a04b714b50c900b0b099b3e3ba15743654e8c576aa4fe504da38015f4c61757590940000000000000000000000000000000000000000c4c3018080";
 
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncoded));
 
@@ -935,7 +935,7 @@ public void combineSignature_MultipleSignature() {
             };
 
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncodedStrings));
-            String expectedRLPEncoding = "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";
+            String expectedRLPEncoding = "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";
 
             SignatureData[] expectedSignatureData = new SignatureData[]{
                     new SignatureData(

core/src/test/java/com/klaytn/caver/common/transaction/FeeDelegatedChainDataAnchoringTest.java

@@ -845,7 +845,7 @@ public void combineSignatures() {
                     .setChainId(chainID)
                     .build();
 
-            String rlpEncoded = "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";
+            String rlpEncoded = "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";
 
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncoded));
 
@@ -884,7 +884,7 @@ public void combineSignature_MultipleSignature() {
             };
 
             String combined = mTxObj.combineSignedRawTransactions(Arrays.asList(rlpEncodedStrings));
-            String expectedRLPEncoding = "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";
+            String expectedRLPEncoding = "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";
 
             SignatureData[] expectedSignatureData = new SignatureData[]{
                     new SignatureData(