Bugfix: ignore static fields on Java classes (#6)

Author: stefan-ka

src/main/java/org/contextmapper/archunit/conditions/AdhereToCmlDomainObjectStructure.java

@@ -17,6 +17,8 @@
 
 import com.tngtech.archunit.core.domain.JavaClass;
 import com.tngtech.archunit.core.domain.JavaField;
+import com.tngtech.archunit.core.domain.JavaMember;
+import com.tngtech.archunit.core.domain.JavaModifier;
 import com.tngtech.archunit.lang.ArchCondition;
 import com.tngtech.archunit.lang.ConditionEvents;
 import com.tngtech.archunit.lang.SimpleConditionEvent;
@@ -27,6 +29,7 @@
 import org.eclipse.xtext.EcoreUtil2;
 
 import java.util.Optional;
+import java.util.stream.Collectors;
 
 public abstract class AdhereToCmlDomainObjectStructure extends ArchCondition<JavaClass> {
 
@@ -44,7 +47,9 @@ public void check(JavaClass javaClass, ConditionEvents events) {
             return;
 
         DomainObject cmlObject = optionalObject.get();
-        for (JavaField field : javaClass.getFields()) {
+        for (JavaField field : javaClass.getFields().stream()
+                .filter(f -> !f.getModifiers().contains(JavaModifier.STATIC))
+                .collect(Collectors.toSet())) {
             Optional<Attribute> cmlField = cmlObject.getAttributes().stream()
                     .filter(f -> f.getName().equals(field.getName()))
                     .findAny();

src/test/java/org/contextmapper/archunit/sample/sampleaggregate1_valueobjectfield_as_attribute/SampleValueObject1.java

@@ -5,6 +5,8 @@
 @ValueObject
 public class SampleValueObject1 {
 
+    private static final String STATIC_FIELDS_MUST_BE_IGNORED = "";
+
     private String sampleField;
 
 }