Maven cannot find Lombok's ExtensionMethod during compilation - maven

Question

I'm using Eclipse and I have mulitmodule Maven project in which I use Lombok(1.16.4) Java=jdk1.7.0_71.
In Eclipse all my code compiles and JUnit testes pass. However in Maven (v. 3.2.3 and 3.3.3) code does not compile.
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] DetermineMarketDirection.java:[86,42] cannot find symbol
symbol: method sumValuesDouble(java.lang.String)
location: variable listToWorkOn of type java.util.List<T>
[INFO] 1 error
This sumValuesDouble is my Lombok's extension method for type List<> which is defined in module A. Error above occures in module C which depends on module A.
This is part of ExtensionList.java:
public static <T> Double sumValuesDouble(List<T> list, final String methodName) {
return sumValuesOf(list, methodName, Double.class);
}
private static <T, N extends Number> N sumValuesOf(List<T> list, final String methodName, Class<N> type) {
Function<T, N> transform = new Function<T, N>() {
#SuppressWarnings("unchecked")
#Override
#SneakyThrows
public N apply(T from) {
Method method = from.getClass().getMethod(methodName);
return (N) method.invoke(from);
}
};
List<N> projectedList = Lists.transform(list, transform);
return sumAll(projectedList);
}
It's very strange because I have tests in Module A for this extension method and they compile OK and pass.
Part of test from Module A:
#ExtensionMethod({ ExtensionList.class })
public class ExtensionListSumAllTest {
#Test
public void testDouble() {
List<ValueDouble> listDouble = new ArrayList<>();
listDouble.add(new ValueDouble(1, 1d));
listDouble.add(new ValueDouble(2, 2d));
listDouble.add(new ValueDouble(3, 3d));
Double actual = listDouble.sumValuesDouble("getValue");
final Double expected = 6d;
assertEquals(expected, actual);
}
#AllArgsConstructor
#Getter
public class ValueDouble {
private final Integer id;
private final Double value;
}
}
What can I do to make Maven "see" this method?
BTW: I use a lot of extension methods in module c and Maven has problem with only that one. Also in this project/eclipse I use Lombok for a long time and I didn't had such problem before.
UPDATE:
I played a little bit more and I found out, that when I add 'dummy' code before execution of Extension method maven compile code wihtout problems.
So, this does not compile
#Slf4j
#ExtensionMethod({ ExtensionList.class })
public class SmaCalculator {
static <C extends Candle> double calculateSMA(List<C> candles, int sma) {
List<C> listToWorkOn = prepareListForSmaCalculation(candles, sma);
Double sum = listToWorkOn.sumValuesOf("getClosePrice");
Double smaValue = sum / sma;
return smaValue;
}
...other methods...
}
But this compiles SUCCESSFULLY by Maven, and dupa object does not even referes to listToWorkOn object:
static <C extends Candle> double calculateSMA(List<C> candles, int sma) {
List<C> listToWorkOn = prepareListForSmaCalculation(candles, sma);
List<C> dupa = new ArrayList<C>();
dupa.add(listToWorkOn.first());
dupa.sumValuesOf("getClosePrice");
Double sum = listToWorkOn.sumValuesOf("getClosePrice");
Double smaValue = sum / sma;
return smaValue;
}

Answer 1

I had the same problem, after switching back to 1.16.2 and it seems to work.