diff --git a/jdescriptor/src/lib.rs b/jdescriptor/src/lib.rs
index 63c64d00..964e101a 100644
--- a/jdescriptor/src/lib.rs
+++ b/jdescriptor/src/lib.rs
@@ -39,7 +39,7 @@ pub fn default_value(type_descriptor: &TypeDescriptor) -> Vec<i32> {
         Byte | Char | Int | Short | Boolean => vec![0],
         Long => vec![0, 0],
         Float => from_f32(0.0),
-        Double => todo!(),
+        Double => from_f64(0.0),
         Void => panic!("field can't be a void type"),
         Array(_, _) => vec![0],
         Object(_) => vec![0],
@@ -180,6 +180,11 @@ fn from_f32(value: f32) -> Vec<i32> {
     vec![value.to_bits() as i32]
 }
 
+fn from_f64(value: f64) -> Vec<i32> {
+    let bits = value.to_bits();
+    vec![(bits >> 32) as i32, bits as i32]
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/tests/test_data/CompositePattern.java b/tests/test_data/CompositePattern.java
index 8fd542cf..6dfa4053 100644
--- a/tests/test_data/CompositePattern.java
+++ b/tests/test_data/CompositePattern.java
@@ -1,14 +1,17 @@
 package samples.inheritance.interfaces.compositepattern;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class CompositePattern {
     public static void main(String[] args) {
-        Composite outerComposite = new Composite(5);
+        Composite outerComposite = new Composite();
         outerComposite.addUnit(new Zealot());
         outerComposite.addUnit(new Zealot());
         outerComposite.addUnit(new DarkTemplar());
         outerComposite.addUnit(new DarkTemplar());
 
-        Composite innerComposite = new Composite(3);
+        Composite innerComposite = new Composite();
         innerComposite.addUnit(new Zealot());
         innerComposite.addUnit(new Unit() {
             @Override
@@ -44,16 +47,14 @@ public int attack() {
 
 class Composite implements Unit {
 
-    private final Unit[] units;
-    private int currentIndex;
+    private final List<Unit> units;
 
-    public Composite(int size) {
-        units = new Unit[size];
-        currentIndex = 0;
+    public Composite() {
+        units = new ArrayList<>();
     }
 
     public void addUnit(Unit unit) {
-        units[currentIndex++] = unit;
+        units.add(unit);
     }
 
     @Override
diff --git a/tests/test_data/samples/inheritance/interfaces/compositepattern/Composite.class b/tests/test_data/samples/inheritance/interfaces/compositepattern/Composite.class
index be449383..e8c353ab 100644
Binary files a/tests/test_data/samples/inheritance/interfaces/compositepattern/Composite.class and b/tests/test_data/samples/inheritance/interfaces/compositepattern/Composite.class differ
diff --git a/tests/test_data/samples/inheritance/interfaces/compositepattern/CompositePattern$1.class b/tests/test_data/samples/inheritance/interfaces/compositepattern/CompositePattern$1.class
index 744b5fc3..765653b0 100644
Binary files a/tests/test_data/samples/inheritance/interfaces/compositepattern/CompositePattern$1.class and b/tests/test_data/samples/inheritance/interfaces/compositepattern/CompositePattern$1.class differ
diff --git a/tests/test_data/samples/inheritance/interfaces/compositepattern/CompositePattern.class b/tests/test_data/samples/inheritance/interfaces/compositepattern/CompositePattern.class
index bcfaa991..485687e6 100644
Binary files a/tests/test_data/samples/inheritance/interfaces/compositepattern/CompositePattern.class and b/tests/test_data/samples/inheritance/interfaces/compositepattern/CompositePattern.class differ
diff --git a/tests/test_data/samples/inheritance/interfaces/compositepattern/DarkTemplar.class b/tests/test_data/samples/inheritance/interfaces/compositepattern/DarkTemplar.class
index f10416bb..7cd0bb07 100644
Binary files a/tests/test_data/samples/inheritance/interfaces/compositepattern/DarkTemplar.class and b/tests/test_data/samples/inheritance/interfaces/compositepattern/DarkTemplar.class differ
diff --git a/tests/test_data/samples/inheritance/interfaces/compositepattern/Unit.class b/tests/test_data/samples/inheritance/interfaces/compositepattern/Unit.class
index 0d818f24..ec59bf68 100644
Binary files a/tests/test_data/samples/inheritance/interfaces/compositepattern/Unit.class and b/tests/test_data/samples/inheritance/interfaces/compositepattern/Unit.class differ
diff --git a/tests/test_data/samples/inheritance/interfaces/compositepattern/Zealot.class b/tests/test_data/samples/inheritance/interfaces/compositepattern/Zealot.class
index 730198db..568186bb 100644
Binary files a/tests/test_data/samples/inheritance/interfaces/compositepattern/Zealot.class and b/tests/test_data/samples/inheritance/interfaces/compositepattern/Zealot.class differ