diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TAbstractStringBuilder.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TAbstractStringBuilder.java
index 026873998..bd748ec4f 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TAbstractStringBuilder.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TAbstractStringBuilder.java
@@ -56,6 +56,13 @@ class TAbstractStringBuilder extends TObject implements TSerializable, TCharSequ
         buffer = new char[capacity];
     }
 
+    public TAbstractStringBuilder(TString value) {
+        buffer = new char[value.length()];
+        for (int i = 0; i < buffer.length; ++i) {
+            buffer[i] = value.charAt(i);
+        }
+    }
+
     protected TAbstractStringBuilder append(TString string) {
         if (string == null) {
             string = TString.wrap("null");
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TStringBuilder.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TStringBuilder.java
index 512e3e599..28a541ea8 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TStringBuilder.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TStringBuilder.java
@@ -28,6 +28,10 @@ public class TStringBuilder extends TAbstractStringBuilder implements TAppendabl
         super();
     }
 
+    public TStringBuilder(TString value) {
+        super(value);
+    }
+
     @Override
     public TStringBuilder append(TString string) {
         super.append(string);
diff --git a/teavm-core/src/main/java/org/teavm/dependency/DependencyNode.java b/teavm-core/src/main/java/org/teavm/dependency/DependencyNode.java
index 452741005..2317647e0 100644
--- a/teavm-core/src/main/java/org/teavm/dependency/DependencyNode.java
+++ b/teavm-core/src/main/java/org/teavm/dependency/DependencyNode.java
@@ -33,12 +33,21 @@ public class DependencyNode implements ValueDependencyInfo {
     private volatile String tag;
     private final AtomicReference<DependencyNode> arrayItemNode = new AtomicReference<>();
     private volatile CountDownLatch arrayItemNodeLatch = new CountDownLatch(1);
+    private int degree;
 
     DependencyNode(DependencyChecker dependencyChecker) {
+        this(dependencyChecker, 0);
+    }
+
+    DependencyNode(DependencyChecker dependencyChecker, int degree) {
         this.dependencyChecker = dependencyChecker;
+        this.degree = degree;
     }
 
     public void propagate(String type) {
+        if (degree > 2) {
+            return;
+        }
         if (types.putIfAbsent(type, mapValue) == null) {
             if (DependencyChecker.shouldLog) {
                 System.out.println(tag + " -> " + type);
@@ -75,7 +84,7 @@ public class DependencyNode implements ValueDependencyInfo {
     public DependencyNode getArrayItem() {
         DependencyNode result = arrayItemNode.get();
         if (result == null) {
-            result = new DependencyNode(dependencyChecker);
+            result = new DependencyNode(dependencyChecker, degree + 1);
             if (arrayItemNode.compareAndSet(null, result)) {
                 if (DependencyChecker.shouldLog) {
                     arrayItemNode.get().tag = tag + "[";