Fix issue with parent (extends) inside another dependency

src/main/java/ch/powerunit/extensions/matchers/provideprocessor/ProvidesMatchersAnnotatedElementMirror.java

@@ -30,6 +30,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.function.Supplier;
 
@@ -110,7 +111,7 @@ public String generateMainJavaDoc() {
 	}
 
 	public Collection<DSLMethod> generateDSLStarter() {
-		return dslProvider.stream().map(Supplier::get).collect(toList());
+		return dslProvider.stream().map(Supplier::get).filter(Objects::nonNull).collect(toList());
 	}
 
 	public String getDefaultStarterBody(boolean withParentBuilder) {
@@ -196,10 +197,10 @@ public ProvidesMatchersAnnotatedElementMirror getParentMirror() {
 	}
 
 	public DSLMethod generateParentValueDSLStarter() {
-		ProvidesMatchersAnnotatedElementMirror parentMirror = getParentMirror();
-		String argumentForParentBuilder = parentMirror.getFullyQualifiedNameOfGeneratedClass() + "."
-				+ parentMirror.methodShortClassName + "WithSameValue(other)";
-		return generatParentValueDSLStarter(argumentForParentBuilder);
+		return Optional.ofNullable(getParentMirror())
+				.map(parentMirror -> generatParentValueDSLStarter(parentMirror.getFullyQualifiedNameOfGeneratedClass()
+						+ "." + parentMirror.methodShortClassName + "WithSameValue(other)"))
+				.orElse(null);
 	}
 
 	public DSLMethod generateParentInSameRoundWithChaningDSLStarter() {

src/test/java/ch/powerunit/extensions/matchers/samples/extension/MyPair.java

@@ -0,0 +1,27 @@
+package ch.powerunit.extensions.matchers.samples.extension;
+
+import org.apache.commons.lang3.tuple.Pair;
+
+import ch.powerunit.extensions.matchers.ProvideMatchers;
+
+@ProvideMatchers
+public class MyPair<L,R> extends Pair<L, R> {
+
+	public String test;
+
+	@Override
+	public R setValue(R arg0) {
+		return null;
+	}
+
+	@Override
+	public L getLeft() {
+		return null;
+	}
+
+	@Override
+	public R getRight() {
+		return null;
+	}
+
+}