diff --git a/codegen/src/main/java/org/web3j/codegen/SolidityFunctionWrapper.java b/codegen/src/main/java/org/web3j/codegen/SolidityFunctionWrapper.java
index d451fba18..e7e3838d3 100644
--- a/codegen/src/main/java/org/web3j/codegen/SolidityFunctionWrapper.java
+++ b/codegen/src/main/java/org/web3j/codegen/SolidityFunctionWrapper.java
@@ -449,7 +449,12 @@ private List<TypeSpec> buildStructTypes(final List<AbiDefinition> functionDefini
             } else {
                 final String fullStructName =
                         internalType.substring(internalType.lastIndexOf(" ") + 1);
-                structName = fullStructName.substring(fullStructName.lastIndexOf(".") + 1);
+                final String tempStructName =
+                        fullStructName.substring(fullStructName.lastIndexOf(".") + 1);
+                structName =
+                        SourceVersion.isName(tempStructName)
+                                ? tempStructName
+                                : "_" + tempStructName;
             }
 
             final TypeSpec.Builder builder =
@@ -513,22 +518,25 @@ private List<TypeSpec> buildStructTypes(final List<AbiDefinition> functionDefini
                                         .build();
                     }
                 }
-                builder.addField(typeName, component.getName(), Modifier.PUBLIC);
-                constructorBuilder.addParameter(typeName, component.getName());
+                final String componentName =
+                        !SourceVersion.isName(component.getName())
+                                ? "_" + component.getName()
+                                : component.getName();
+                builder.addField(typeName, componentName, Modifier.PUBLIC);
+                constructorBuilder.addParameter(typeName, componentName);
                 ParameterSpec.Builder nativeParameterBuilder =
-                        ParameterSpec.builder(nativeTypeName, component.getName());
+                        ParameterSpec.builder(nativeTypeName, componentName);
                 if (annotationSpec != null) {
                     nativeParameterBuilder.addAnnotation(annotationSpec);
                 }
                 nativeConstructorBuilder.addParameter(nativeParameterBuilder.build());
 
-                constructorBuilder.addStatement(
-                        "this." + component.getName() + " = " + component.getName());
+                constructorBuilder.addStatement("this." + componentName + " = " + componentName);
                 nativeConstructorBuilder.addStatement(
                         "this."
-                                + component.getName()
+                                + componentName
                                 + " = "
-                                + component.getName()
+                                + componentName
                                 + adjustToNativeTypeIfNecessary(component),
                         Collectors.class);
             }
@@ -1014,8 +1022,11 @@ String addParameters(
 
         for (int i = 0; i < inputParameterTypes.size(); ++i) {
             final TypeName typeName = getTypenameForArray(namedTypes.get(i), useJavaPrimitiveTypes);
-            nativeInputParameterTypes.add(
-                    ParameterSpec.builder(typeName, inputParameterTypes.get(i).name).build());
+            final String paramName =
+                    !SourceVersion.isName(inputParameterTypes.get(i).name)
+                            ? "_" + inputParameterTypes.get(i).name
+                            : inputParameterTypes.get(i).name;
+            nativeInputParameterTypes.add(ParameterSpec.builder(typeName, paramName).build());
         }
 
         methodBuilder.addParameters(nativeInputParameterTypes);
@@ -1273,6 +1284,9 @@ static String createValidParamName(String name, int idx) {
         if (name == null || name.equals("")) {
             return "param" + idx;
         } else {
+            if (!SourceVersion.isName(name)) {
+                name = "_" + name;
+            }
             return name;
         }
     }
diff --git a/codegen/src/test/java/org/web3j/codegen/SolidityFunctionWrapperTest.java b/codegen/src/test/java/org/web3j/codegen/SolidityFunctionWrapperTest.java
index 2f15a1130..0faa58a5a 100644
--- a/codegen/src/test/java/org/web3j/codegen/SolidityFunctionWrapperTest.java
+++ b/codegen/src/test/java/org/web3j/codegen/SolidityFunctionWrapperTest.java
@@ -77,6 +77,7 @@ public void setUp() throws Exception {
     public void testCreateValidParamName() {
         assertEquals(createValidParamName("param", 1), ("param"));
         assertEquals(createValidParamName("", 1), ("param1"));
+        assertEquals(createValidParamName("class", 1), ("_class"));
     }
 
     @Test
diff --git a/codegen/src/test/resources/solidity/javareservedwords/JavaReservedWords.sol b/codegen/src/test/resources/solidity/javareservedwords/JavaReservedWords.sol
new file mode 100644
index 000000000..291aa9838
--- /dev/null
+++ b/codegen/src/test/resources/solidity/javareservedwords/JavaReservedWords.sol
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract JavaReservedWords {
+
+    string public goto;
+
+    struct extends {
+        uint class;
+    }
+
+    function void(extends calldata protected) external pure returns (uint) {
+        return protected.class;
+    }
+}
\ No newline at end of file
diff --git a/codegen/src/test/resources/solidity/javareservedwords/build/JavaReservedWords.abi b/codegen/src/test/resources/solidity/javareservedwords/build/JavaReservedWords.abi
new file mode 100644
index 000000000..8a1dc513f
--- /dev/null
+++ b/codegen/src/test/resources/solidity/javareservedwords/build/JavaReservedWords.abi
@@ -0,0 +1 @@
+[{"inputs":[],"name":"goto","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"class","type":"uint256"}],"internalType":"struct JavaReservedWords.extends","name":"protected","type":"tuple"}],"name":"void","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"}]
\ No newline at end of file
diff --git a/codegen/src/test/resources/solidity/javareservedwords/build/JavaReservedWords.bin b/codegen/src/test/resources/solidity/javareservedwords/build/JavaReservedWords.bin
new file mode 100644
index 000000000..f9ea67423
--- /dev/null
+++ b/codegen/src/test/resources/solidity/javareservedwords/build/JavaReservedWords.bin
@@ -0,0 +1 @@
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
\ No newline at end of file
diff --git a/integration-tests/src/test/java/org/web3j/protocol/scenarios/FunctionWrappersIT.java b/integration-tests/src/test/java/org/web3j/protocol/scenarios/FunctionWrappersIT.java
index 103a74012..968036d03 100644
--- a/integration-tests/src/test/java/org/web3j/protocol/scenarios/FunctionWrappersIT.java
+++ b/integration-tests/src/test/java/org/web3j/protocol/scenarios/FunctionWrappersIT.java
@@ -23,6 +23,7 @@
 import org.web3j.protocol.core.methods.response.TransactionReceipt;
 import org.web3j.protocol.http.HttpService;
 import org.web3j.test.contract.Fibonacci;
+import org.web3j.test.contract.JavaReservedWords;
 import org.web3j.tx.gas.ContractGasProvider;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -38,12 +39,32 @@
 public class FunctionWrappersIT extends Scenario {
 
     private static Fibonacci fib;
+    private static JavaReservedWords javaReservedWords;
 
     @BeforeAll
     public static void setUp(Web3j web3j, ContractGasProvider contractGasProvider)
             throws Exception {
         Scenario.web3j = web3j;
         FunctionWrappersIT.fib = Fibonacci.deploy(web3j, ALICE, contractGasProvider).send();
+        FunctionWrappersIT.javaReservedWords =
+                JavaReservedWords.deploy(web3j, ALICE, contractGasProvider).send();
+    }
+
+    @Test
+    public void testJavaReservedWords() throws Exception {
+
+        JavaReservedWords javaReservedWordsContract =
+                JavaReservedWords.load(
+                        javaReservedWords.getContractAddress(),
+                        Web3j.build(new HttpService()),
+                        ALICE,
+                        STATIC_GAS_PROVIDER);
+
+        BigInteger result =
+                javaReservedWordsContract
+                        ._void(new JavaReservedWords._extends(BigInteger.TEN))
+                        .send();
+        assertEquals(result, (BigInteger.valueOf(10)));
     }
 
     @Test
diff --git a/integration-tests/src/test/resources/JavaReservedWords.bin b/integration-tests/src/test/resources/JavaReservedWords.bin
new file mode 100644
index 000000000..f9ea67423
--- /dev/null
+++ b/integration-tests/src/test/resources/JavaReservedWords.bin
@@ -0,0 +1 @@
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
\ No newline at end of file