diff --git a/infer/tests/codetoanalyze/java/performance/ArrayCost.java b/infer/tests/codetoanalyze/java/performance/ArrayCost.java
index 5f5383cfc..ce7894830 100644
--- a/infer/tests/codetoanalyze/java/performance/ArrayCost.java
+++ b/infer/tests/codetoanalyze/java/performance/ArrayCost.java
@@ -19,4 +19,21 @@ public class ArrayCost {
 
         }
     }
+
+    private static boolean isPowOfTwo_FP(int value) {
+        int ones = 0;
+        int v = value;
+
+        for (int shifts = 0; shifts < 31 && ones <= 1; shifts++) {
+            if ((v & 1) == 1) {
+                ones++;
+            }
+
+            v >>= 1;
+        }
+
+        return ones == 1;
+    }
+
+
 }
diff --git a/infer/tests/codetoanalyze/java/performance/JsonArray.java b/infer/tests/codetoanalyze/java/performance/JsonArray.java
new file mode 100644
index 000000000..7cb664302
--- /dev/null
+++ b/infer/tests/codetoanalyze/java/performance/JsonArray.java
@@ -0,0 +1,17 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package libraries.marauder.analytics.utils.json;
+
+public class JsonArray implements JsonType {
+
+  public StringBuilder array = new StringBuilder("[");
+
+
+  public void addStringEntry(String value) {
+    if (array.length() != 1) {
+      array.append(",");
+    }
+    JsonUtils.serialize(array, value);
+  }
+
+}
diff --git a/infer/tests/codetoanalyze/java/performance/JsonMap.java b/infer/tests/codetoanalyze/java/performance/JsonMap.java
new file mode 100644
index 000000000..d5cac4358
--- /dev/null
+++ b/infer/tests/codetoanalyze/java/performance/JsonMap.java
@@ -0,0 +1,52 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package libraries.marauder.analytics.utils.json;
+
+public class JsonMap implements JsonType {
+
+  public StringBuilder map = new StringBuilder("{");
+
+  public void addEntry(String key, JsonType value) {
+    if (!JsonUtils.isValidInputType(value)) {
+      //throw new IllegalStateException("illegal input type " + value);
+    }
+
+    addKeyToMap(key);
+    map.append(value.toString());
+  }
+
+  public void addEntry(String key, String value) {
+    addKeyToMap(key);
+    JsonUtils.serialize(map, value);
+  }
+
+  public void addEntry(String key, long value) {
+    addKeyToMap(key);
+    JsonUtils.serialize(map, value);
+  }
+
+  public void addEntry(String key, double value) {
+    addKeyToMap(key);
+    JsonUtils.serialize(map, value);
+  }
+
+  public void addEntry(String key, boolean value) {
+    addKeyToMap(key);
+    JsonUtils.serialize(map, value);
+  }
+
+  public void addEntry(String key, Object value) {
+    addKeyToMap(key);
+    JsonUtils.serialize(map, value);
+  }
+
+
+  private void addKeyToMap(String key) {
+    if (map.length() != 1) {
+      map.append(",");
+    }
+
+    JsonUtils.serialize(map, key);
+    map.append(":");
+  }
+}
diff --git a/infer/tests/codetoanalyze/java/performance/JsonString.java b/infer/tests/codetoanalyze/java/performance/JsonString.java
new file mode 100644
index 000000000..cb5dec6d3
--- /dev/null
+++ b/infer/tests/codetoanalyze/java/performance/JsonString.java
@@ -0,0 +1,29 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package libraries.marauder.analytics.utils.json;
+
+public class JsonString implements JsonType {
+
+  public String array;
+
+  public JsonString(String input) {
+    array = JsonUtils.serialize(input).toString();
+  }
+
+  public JsonString(long input) {
+    array = JsonUtils.serialize(input);
+  }
+
+  public JsonString(double input) {
+    array = JsonUtils.serialize(input);
+  }
+
+  public JsonString(boolean input) {
+    array = JsonUtils.serialize(input);
+  }
+
+  public String toString() {
+    return array;
+  }
+
+}
diff --git a/infer/tests/codetoanalyze/java/performance/JsonType.java b/infer/tests/codetoanalyze/java/performance/JsonType.java
new file mode 100644
index 000000000..869496828
--- /dev/null
+++ b/infer/tests/codetoanalyze/java/performance/JsonType.java
@@ -0,0 +1,7 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package libraries.marauder.analytics.utils.json;
+
+public interface JsonType {
+
+}
diff --git a/infer/tests/codetoanalyze/java/performance/JsonUtils.java b/infer/tests/codetoanalyze/java/performance/JsonUtils.java
new file mode 100644
index 000000000..51ed4e228
--- /dev/null
+++ b/infer/tests/codetoanalyze/java/performance/JsonUtils.java
@@ -0,0 +1,85 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package libraries.marauder.analytics.utils.json;
+
+public class JsonUtils {
+
+  private static void escape(StringBuilder builder, String input) {
+    for (Character c : input.toCharArray()) {
+      if (Character.getType(c) == Character.CONTROL) {
+        builder.append(String.format("\\u%04x", (int)c));
+      } else if (c == '\\' || c== '\"') {
+        builder.append('\\').append(c);
+      } else {
+        builder.append(c);
+      }
+    }
+  }
+
+  public static StringBuilder serialize(String input) {
+    StringBuilder stringBuilder = new StringBuilder();
+    serialize(stringBuilder, input);
+    return stringBuilder;
+  }
+
+  public static String serialize(long input) {
+    return String.valueOf(input);
+  }
+
+  public static String serialize(boolean input) {
+    return String.valueOf(input);
+  }
+
+  public static String serialize(double input) {
+    return String.valueOf(input);
+  }
+
+  public static String serialize(Object input) {
+    if (input instanceof Integer
+        || input instanceof Float
+        || input instanceof Long
+        || input instanceof Double
+        || input instanceof Boolean
+        || input instanceof Byte
+        || input instanceof Short) {
+        return "";//String.valueOf(input);
+    } else {
+        return "";// serialize(String.valueOf(input)).toString();
+    }
+  }
+
+  public static void serialize(StringBuilder out, String input) {
+    if (input == null) {
+      out.append("null");
+    } else {
+      out.append("\"");
+      escape(out, input);
+      out.append("\"");
+    }
+  }
+
+  public static void serialize(StringBuilder out, long input) {
+    out.append(serialize(input));
+  }
+
+  public static void serialize(StringBuilder out, boolean input) {
+    out.append(serialize(input));
+  }
+
+  public static void serialize(StringBuilder out, double input) {
+    out.append(serialize(input));
+  }
+
+  public static void serialize(StringBuilder out, Object input) {
+    out.append(serialize(input));
+  }
+
+  public static boolean isValidInputType(Object value) {
+    if (value instanceof JsonString ||
+        value instanceof JsonArray ||
+        value instanceof JsonMap) {
+      return true;
+    }
+    return false;
+  }
+}
diff --git a/infer/tests/codetoanalyze/java/performance/issues.exp b/infer/tests/codetoanalyze/java/performance/issues.exp
index 7b6823da8..15b5625b2 100644
--- a/infer/tests/codetoanalyze/java/performance/issues.exp
+++ b/infer/tests/codetoanalyze/java/performance/issues.exp
@@ -1 +1,15 @@
+codetoanalyze/java/performance/ArrayCost.java, boolean ArrayCost.isPowOfTwo_FP(int), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
 codetoanalyze/java/performance/ArrayCost.java, void ArrayCost.ArrayCost_FP(int,int[]), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonArray.java, void JsonArray.addStringEntry(String), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonMap.java, void JsonMap.addEntry(String,JsonType), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonMap.java, void JsonMap.addEntry(String,Object), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonMap.java, void JsonMap.addEntry(String,String), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonMap.java, void JsonMap.addEntry(String,boolean), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonMap.java, void JsonMap.addEntry(String,double), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonMap.java, void JsonMap.addEntry(String,long), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonMap.java, void JsonMap.addKeyToMap(String), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonString.java, JsonString.<init>(String), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonUtils.java, StringBuilder JsonUtils.serialize(String), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonUtils.java, void JsonUtils.escape(StringBuilder,String), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []
+codetoanalyze/java/performance/JsonUtils.java, void JsonUtils.escape(StringBuilder,String), 1, BUFFER_OVERRUN_U5, ERROR, [Unknown value from: char[] String.toCharArray(),Assignment,ArrayAccess: Offset: [-oo, +oo] Size: [0, +oo]]
+codetoanalyze/java/performance/JsonUtils.java, void JsonUtils.serialize(StringBuilder,String), 0, INFINITE_EXECUTION_TIME_CALL, ERROR, []