Updated for BAEL 971 (#2702)

* Updated Lang3Utils.java

Added a new test for ConcurrentException and updated other exception with Lambda

* LazyInitializer sample files

* Updated file with LazyInitializer Unit Test

* Updated BuidlerMethods class to include LazyInitializer & BackgroundInitializer

* Updated Lang3UtilsTest class

* Updated Lang3UtilsTest class

libraries/src/main/java/com/baeldung/commons/lang3/BuilderMethods.java

@@ -3,6 +3,8 @@ package com.baeldung.commons.lang3;
 import org.apache.commons.lang3.builder.EqualsBuilder;
 import org.apache.commons.lang3.builder.HashCodeBuilder;
 import org.apache.commons.lang3.builder.ToStringBuilder;
+import org.apache.commons.lang3.concurrent.ConcurrentException;
+import org.apache.commons.lang3.concurrent.BackgroundInitializer;
 
 public class BuilderMethods {
 
@@ -56,5 +58,36 @@ public class BuilderMethods {
         System.out.println(simple1.getName());
         System.out.println(simple1.hashCode());
         System.out.println(simple1.toString());
+        
+        SampleLazyInitializer sampleLazyInitializer = new SampleLazyInitializer();
+        
+        try {
+            sampleLazyInitializer.get();
+        } catch (ConcurrentException e1) {
+            // TODO Auto-generated catch block
+            e1.printStackTrace();
+        }
+        
+        SampleBackgroundInitializer sampleBackgroundInitializer = new SampleBackgroundInitializer();
+        sampleBackgroundInitializer.start();
+        
+        // Proceed with other tasks instead of waiting for the SampleBackgroundInitializer task to finish.
+        
+        try {
+            Object result = sampleBackgroundInitializer.get();
+        } catch (ConcurrentException e) {
+            e.printStackTrace();
+        }
     }
 }
+
+class SampleBackgroundInitializer extends BackgroundInitializer<String>{
+
+    @Override
+    protected String initialize() throws Exception {
+        return null;
+    }
+    
+    // Any complex task that takes some time
+    
+}

libraries/src/test/java/com/baeldung/commons/lang3/Lang3UtilsTest.java

@@ -3,7 +3,9 @@ package com.baeldung.commons.lang3;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -20,6 +22,7 @@ import org.apache.commons.lang3.ArchUtils;
 import org.apache.commons.lang3.BooleanUtils;
 import org.apache.commons.lang3.SystemUtils;
 import org.apache.commons.lang3.arch.Processor;
+import org.apache.commons.lang3.concurrent.BasicThreadFactory;
 import org.apache.commons.lang3.concurrent.ConcurrentException;
 import org.apache.commons.lang3.concurrent.ConcurrentRuntimeException;
 import org.apache.commons.lang3.concurrent.ConcurrentUtils;
@@ -133,4 +136,14 @@ public class Lang3UtilsTest {
         assertEquals(sampleObjectOne, sampleObjectTwo);
     }
 
+    @Test
+    public void testBuildDefaults() {
+        BasicThreadFactory.Builder builder = new BasicThreadFactory.Builder();
+        BasicThreadFactory factory = builder.build();
+        assertNull("No naming pattern set Yet", factory.getNamingPattern());
+        BasicThreadFactory factory2 = builder.namingPattern("sampleNamingPattern").daemon(true).priority(Thread.MIN_PRIORITY).build();
+        assertNotNull("Got a naming pattern", factory2.getNamingPattern());
+        assertEquals("sampleNamingPattern", factory2.getNamingPattern());
+
+    }
 }