diff --git a/README.md b/README.md
index 957f8f1..cb95e5b 100644
--- a/README.md
+++ b/README.md
@@ -49,12 +49,12 @@ framework and objects.
 <dependency>
   <groupId>com.javaquery</groupId>
   <artifactId>util</artifactId>
-  <version>1.2.6</version>
+  <version>1.2.7</version>
 </dependency>
 ``` 
 
 # Gradle
 
 ```
-implementation 'com.javaquery:util:1.2.6'
+implementation 'com.javaquery:util:1.2.7'
 ```
diff --git a/build.gradle b/build.gradle
index 582e4c0..7d50265 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,22 +5,23 @@ plugins {
 }
 
 sourceCompatibility = 1.8
+targetCompatibility = 1.8
 group 'com.javaquery'
 archivesBaseName = 'util'
-version '1.2.6'
+version '1.2.7'
 
 repositories {
     mavenCentral()
 }
 
 dependencies {
-    implementation('org.slf4j:slf4j-api:2.0.11')
-    implementation('org.json:json:20231013')
-    implementation group: 'com.fasterxml.jackson.core', name: 'jackson-annotations', version: '2.16.1'
+    implementation 'org.slf4j:slf4j-api:2.0.16'
+    implementation 'org.json:json:20250107'
+    implementation group: 'com.fasterxml.jackson.core', name: 'jackson-annotations', version: '2.18.2'
 
     testImplementation 'net.logstash.logback:logstash-logback-encoder:7.4'
-    testImplementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.3.14'
-    testImplementation('org.junit.jupiter:junit-jupiter:5.7.0')
+    testImplementation 'ch.qos.logback:logback-classic:1.3.15'
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.11.4'
 }
 
 test {
diff --git a/src/main/java/com/javaquery/util/ExecutionContext.java b/src/main/java/com/javaquery/util/ExecutionContext.java
index cb32032..1cf6ebc 100644
--- a/src/main/java/com/javaquery/util/ExecutionContext.java
+++ b/src/main/java/com/javaquery/util/ExecutionContext.java
@@ -42,6 +42,7 @@ public class ExecutionContext<T, V> {
 
     public ExecutionContext() {
         this.createdAt = Dates.current();
+        this.meta = new HashMap<>();
     }
 
     public ExecutionContext(String requestId){
@@ -123,6 +124,10 @@ public Object getMeta(String key, Object defaultValue){
         return meta.getOrDefault(key, defaultValue);
     }
 
+    public String optString(String key, String defaultValue){
+        return String.valueOf(getMeta(key, defaultValue));
+    }
+
     public void addMeta(String key, Object value){
         this.meta.put(key, value);
     }
diff --git a/src/main/java/com/javaquery/util/Is.java b/src/main/java/com/javaquery/util/Is.java
index d789b92..f011156 100644
--- a/src/main/java/com/javaquery/util/Is.java
+++ b/src/main/java/com/javaquery/util/Is.java
@@ -47,6 +47,18 @@ public static boolean nonNull(Object obj) {
         return Objects.nonNull(obj);
     }
 
+    /**
+     * Execute code if the provided reference is non-{@code null}.
+     *
+     * @param obj a reference to be checked against {@code null}
+     * @param executableFunction lambda function given executed if the provided reference is non-{@code null}.
+     */
+    public static void nonNull(Object obj, ExecutableFunction executableFunction){
+        if(nonNull(obj)){
+            executableFunction.execute();
+        }
+    }
+
     /**
      * Returns {@code true} if the provided String is {@code null} or empty otherwise returns {@code
      * false}.
diff --git a/src/main/java/com/javaquery/util/collection/JList.java b/src/main/java/com/javaquery/util/collection/JList.java
new file mode 100644
index 0000000..ed0f7e5
--- /dev/null
+++ b/src/main/java/com/javaquery/util/collection/JList.java
@@ -0,0 +1,16 @@
+package com.javaquery.util.collection;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * @author javaquery
+ * @since 1.2.7
+ */
+public class JList {
+
+    @SafeVarargs
+    public static <E> List<E> of(E... elements) {
+       return Arrays.asList(elements);
+    }
+}
diff --git a/src/main/java/com/javaquery/util/collection/JSet.java b/src/main/java/com/javaquery/util/collection/JSet.java
new file mode 100644
index 0000000..b8850af
--- /dev/null
+++ b/src/main/java/com/javaquery/util/collection/JSet.java
@@ -0,0 +1,15 @@
+package com.javaquery.util.collection;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * @author javaquery
+ * @since 1.2.7
+ */
+public class JSet {
+    public static <E> Set<E> of(E... elements) {
+        return new HashSet<>(Arrays.asList(elements));
+    }
+}
diff --git a/src/main/java/com/javaquery/util/number/Numbers.java b/src/main/java/com/javaquery/util/number/Numbers.java
index 7cf6245..2eb634a 100644
--- a/src/main/java/com/javaquery/util/number/Numbers.java
+++ b/src/main/java/com/javaquery/util/number/Numbers.java
@@ -11,9 +11,9 @@ public class Numbers {
 
     /**
      * Round the decimal number.
-     * example: roundDecimal(10.123456789, 2) => 10.12
-     * example: roundDecimal(10.123456789, 4) => 10.1235
-     * example: roundDecimal(10.576, 2) => 10.58
+     * example: roundDecimal(10.123456789, 2) = 10.12
+     * example: roundDecimal(10.123456789, 4) = 10.1235
+     * example: roundDecimal(10.576, 2) = 10.58
      *
      * @param number number to round
      * @param decimalPlaces decimal places to round
diff --git a/src/test/java/com/javaquery/util/TestExecutionContext.java b/src/test/java/com/javaquery/util/TestExecutionContext.java
index 34fb60e..327fac5 100644
--- a/src/test/java/com/javaquery/util/TestExecutionContext.java
+++ b/src/test/java/com/javaquery/util/TestExecutionContext.java
@@ -45,6 +45,7 @@ public void defaultConstructor(){
         executionContext.setRequestId(UniqueIdGenerator.generate());
 
         UserContext userContext = (UserContext) executionContext.getUserContext();
+        assertNotNull(executionContext.getMeta());
         assertEquals(50L, userContext.getUserId());
         assertNotNull(executionContext.getCreatedAt());
         assertNotNull(executionContext.getRequestId());
@@ -102,6 +103,7 @@ public void constructorWithActionAndMeta(){
         assertEquals(ExecutionContextAction.ONE, executionContext.getAction());
         assertNull(executionContext.getReferenceId());
         assertEquals("value", executionContext.getMeta("key", null));
+        assertEquals("not found", executionContext.optString("key2", "not found"));
         assertNotNull(executionContext.getCreatedAt());
 
         /* set meta */
@@ -142,4 +144,15 @@ public void constructorWithActionMaxRetries(){
         assertNotNull(executionContext.getMeta());
         assertNotNull(executionContext.getCreatedAt());
     }
+
+    @Test
+    public void metaDataTest(){
+        ExecutionContext<String, Void> executionContext = new ExecutionContext<>();
+        executionContext.addMeta("key", "value");
+        assertEquals("value", executionContext.getMeta("key", null));
+        assertEquals("value", executionContext.optString("key", null));
+        assertEquals("not found", executionContext.optString("key2", "not found"));
+        executionContext.addMeta("key", "value2");
+        assertEquals("value2", executionContext.getMeta("key", null));
+    }
 }
diff --git a/src/test/java/com/javaquery/util/collection/TestJList.java b/src/test/java/com/javaquery/util/collection/TestJList.java
new file mode 100644
index 0000000..9958111
--- /dev/null
+++ b/src/test/java/com/javaquery/util/collection/TestJList.java
@@ -0,0 +1,24 @@
+package com.javaquery.util.collection;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * @author javaquery
+ * @since 2025-01-20
+ */
+public class TestJList {
+
+    @Test
+    public void test_of(){
+        List<String> list = JList.of("a", "b", "c");
+        assertEquals(3, list.size());
+        assertTrue(list.contains("a"));
+        assertTrue(list.contains("b"));
+        assertTrue(list.contains("c"));
+    }
+}
diff --git a/src/test/java/com/javaquery/util/collection/TestJSet.java b/src/test/java/com/javaquery/util/collection/TestJSet.java
new file mode 100644
index 0000000..f0a2aec
--- /dev/null
+++ b/src/test/java/com/javaquery/util/collection/TestJSet.java
@@ -0,0 +1,24 @@
+package com.javaquery.util.collection;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * @author javaquery
+ * @since 2025-01-20
+ */
+public class TestJSet {
+
+    @Test
+    public void test_of(){
+        Set<String> set = JSet.of("a", "b", "c");
+        assertEquals(3, set.size());
+        assertTrue(set.contains("a"));
+        assertTrue(set.contains("b"));
+        assertTrue(set.contains("c"));
+    }
+}