Java Utililty Methods Assert Not Null

void assertArgNotNull(final String argName, final Object argValue)
assert Arg Not Null

if (argValue == null) {
 throw new IllegalArgumentException("Argument '" + argName + "' cannot be null");

void assertArgNotNull(T obj, String name)
assert Arg Not Null

if (obj == null) {
 throw new IllegalArgumentException("argument " + name == null ? "" : name + " is null");

T assertArgumentNotNull(T argument, String argumentName)
Throws an IllegalArgumentException if the provided argument is null.

if (argument == null)
 throw new IllegalArgumentException("Argument cannot be null - '" + argumentName + "'");
return argument;

void assertElementNotNull(Object element, Class elementClass)
assert Element Not Null

if (element == null) {
 throw new IllegalArgumentException(elementClass.getName() + " must be set");

void assertFieldNotNull(Object fieldValue, String fieldName)
Throws an IllegalArgumentException if the specified field is null.

if (fieldValue == null)
 throw new IllegalArgumentException("Field '" + fieldName + "' cannot be null.");

Object assertFormatResultNotNull(Object r)
assert Format Result Not Null

if (r != null) {
 return r;
throw new NullPointerException("TemplateValueFormatter result can't be null");

void assertInstanceOfNotNull(Object obj, Class expClass)
Checks if the passed object is of the class specified, null values throw an exception

if (obj == null) {
 throw new AssertionError(
 "Checking instanceof but object is null, expecting class: " + expClass.getName());
if (!(expClass.isAssignableFrom(obj.getClass()))) {
 throw new AssertionError(
 "Expected class: " + expClass.getName() + " but object has class: " + obj.getClass().getName());

void assertNotNull(final Object o, final String message)
assert Not Null

if (o == null)
 throw new NullPointerException(message);

void assertNotNull(final Object obj, final String msg)
assert Not Null

if (null == obj) {
 throw new IllegalArgumentException(msg);

void assertNotNull(final Object obj, final String reference)
assert Not Null

if (obj == null) {
 throw new IllegalArgumentException(String
 .format("[Assertion failed error. Expected not null reference %s, but got <NULL>]", reference));