DSL example Pass compile but can't run .

[JulianZhang]

Hi I had try with the DSL Expression example, I had pass compile and package with maven.

But when I try to run the example it say as

java -cp target/spl2es-0.0.1-SNAPSHOT.jar spl2es.Expression
Exception in thread "main" java.lang.Error: Unresolved compilation problem:

	at spl2es.Expression.main(Expression.java:39)

The blow is my Expression.java, And I had check only can find Expression.class and Expression$Cases.class. Does there should find an class file such as Expressions.class

import static java.util.Arrays.asList;
import org.derive4j.*;
import static spl2es.Expressions.*;
import java.util.function.Function;
import java.util.List;
import javax.json.*;

@Data
public abstract class Expression {
	interface Cases<R> {
		R Leaf(String key,String value);
		R EList(List<Expression> blist);
		R ELeaf(String key, Expression value);
    }
    public abstract <R> R match(Cases<R> cases);
	private static Function<Expression, JsonValue> eval = Expressions
    .cases()
        .Leaf((key,value)        -> Json.createObjectBuilder()
            .add(key,value).build()
        )
        .ELeaf((key, value)  -> Json.createObjectBuilder()
            .add(key,eval(value)).build()
        )
        .EList(blist -> {
                JsonArrayBuilder job =Json.createArrayBuilder();
                for (Expression e : blist) {
                    job.add(e);
                }
                return job.build();
            }
        );
    public static JsonValue eval(Expression expression) {
        return eval.apply(expression);
    }
    public static JsonValue test (){
        Expression expr = Leaf("2","3");
        eval(expr);
    }
    public static void main(String[] args) {
        System.out.print(test().toString());
    }            
}

[jbgi]

Hi,
Are you using eclipse? In that case make sure to a maven clean before producing the jar, because ecj can produce this kind of error at runtime by filling uncompillable portion of the code with throw new Error. In your case it looks like the test is missing the return.

[JulianZhang]

@jbgi Thanks for reply, I think my problem is cause by wrong maven setting.
Do you have any build able pom.xml example.

[jbgi]

yes: https://github.com/jbgi/eventsrc4j/blob/master/core/pom.xml

[JulianZhang]

@jbgi Thank you

[JulianZhang]

https://github.com/AndreasVoellmy/derive4jbenchmark is run able example with maven.