Prepend solidity function name with "_"

if it is a reserved keyword in the current java version

codegen/src/main/java/org/web3j/codegen/SolidityFunctionWrapper.java

@@ -14,6 +14,8 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
+
+import javax.lang.model.SourceVersion;
 import javax.lang.model.element.Modifier;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
@@ -680,6 +682,12 @@ MethodSpec buildFunction(
             AbiDefinition functionDefinition) throws ClassNotFoundException {
         String functionName = functionDefinition.getName();
 
+        // If the solidity function name is a reserved word
+        // in the current java version prepend it with "_"
+        if(!SourceVersion.isName(functionName)) {
+            functionName = "_" + functionName;
+        }
+
         MethodSpec.Builder methodBuilder =
                 MethodSpec.methodBuilder(functionName)
                         .addModifiers(Modifier.PUBLIC);

codegen/src/test/java/org/web3j/codegen/SolidityFunctionWrapperGeneratorTest.java

@@ -85,6 +85,12 @@ public void testShipIt() throws Exception {
         testCodeGenerationSolidityTypes("shipit", "ShipIt");
     }
 
+    @Test
+    public void testMisc() throws Exception {
+        testCodeGenerationJvmTypes("misc", "Misc");
+        testCodeGenerationSolidityTypes("misc", "Misc");
+    }
+
     @Test
     public void testContractsNoBin() throws Exception {
         testCodeGeneration("contracts", "HumanStandardToken", JAVA_TYPES_ARG, false);

codegen/src/test/resources/solidity/build.sh

@@ -4,7 +4,8 @@ targets="
 arrays/Arrays
 contracts/HumanStandardToken
 fibonacci/Fibonacci
-greeter/Greeter
+greeter/Greeter]
+misc/Misc
 shipit/ShipIt
 simplestorage/SimpleStorage
 "

codegen/src/test/resources/solidity/misc/Misc.sol

@@ -0,0 +1,10 @@
+pragma solidity ^0.4.0;
+
+contract Misc {
+
+    constructor() public {}
+
+    function double(uint a) public pure returns(uint) {
+        return 2*a;
+    }
+}

codegen/src/test/resources/solidity/misc/build/Misc.abi

@@ -0,0 +1 @@
+[{"constant":true,"inputs":[{"name":"a","type":"uint256"}],"name":"double","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"pure","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]

codegen/src/test/resources/solidity/misc/build/Misc.bin

@@ -0,0 +1 @@
+6080604052348015600f57600080fd5b50609c8061001e6000396000f300608060405260043610603e5763ffffffff7c0100000000000000000000000000000000000000000000000000000000600035041663eee9720681146043575b600080fd5b348015604e57600080fd5b506058600435606a565b60408051918252519081900360200190f35b600202905600a165627a7a72305820463dc8fd1001eab87e0d065568e214f4bcf701a33b61a213fa5c607b116689ed0029