Jboss流口水5.4.0.JDK 7最终版

Question

Trying to write a consequence of a rule which uses diamond operator. Getting the following error message. java.version system property is set to 1.7 and JavaDialectConfiguration class gets the language level as 1.7, still why drools is not able to compile diamond operator?

Incorrect number of arguments for type HashMap<K,V>; it cannot be parameterized with arguments <?>

Sample Rule :

package rule.test;
import java.util.Map;
import java.util.HashMap;

dialect "java"

rule "Test jdk 7"
when
then
Map<String, String> params= new HashMap<>();
end

Answer 1

drools compiler maven artifact of 5.4.0.Final or 5.5.0.Final are pulling 3.5.1 version of eclipse core compiler.

<groupId>org.eclipse.jdt.core.compiler</groupId>
<artifactId>ecj</artifactId>
<version>3.5.1</version>

When I put latest version of JDT compiler into my pom, the issue gets resolved.

<dependency>
<groupId>org.eclipse.jdt.core.compiler</groupId>
<artifactId>ecj</artifactId>
<version>4.2.2</version>
<scope>runtime</scope>
</dependency>