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How to execute a piece of code once before all test classes start?

How can I execute a method once before all tests in all classes start?
I have a program that needs a system property to be set before any test start. Is there any way to do that?
Note: #BeforeClass or #Before are used just for the same test class. In my case, I'm looking for a way to execute a method before all test classes start.

To setup precondition to your test cases you can use something like this -
#Before
public void setUp(){
// Set up you preconditions here
// This piece of code will be executed before any of the test case execute
}

if you need to run that method before the start of all test you should use the annotation #BeforeClass or if you need to execute the same method every time you will execute a test method of that class you must use #Before
f.e
#Before
public void executedBeforeEach() {
//this method will execute before every single test
}
#Test
public void EmptyCollection() {
assertTrue(testList.isEmpty());
}

You can make use of a Test Suite.
The test suite
#RunWith(Suite.class)
#Suite.SuiteClasses({ TestClass.class, Test2Class.class, })
public class TestSuite {
#BeforeClass
public static void setup() {
// the setup
}
}
and, the test classes
public class Test2Class {
#Test
public void test2() {
// some test
}
}
public class TestClass {
#Test
public void test() {
// some test
}
}
Or, you can have a base class which handles the setup
public class TestBase {
#BeforeClass
public static void setup() {
// setup
}
}
and, then the test classes can extend the base class
public class TestClass extends TestBase {
#Test
public void test() {
// some test
}
}
public class Test2Class extends TestBase {
#Test
public void test() {
// some test
}
}
However, this will call the setup method in TestBase for all its subclasses everytime each of them executes.

Grails JUnit Test case, doesn't execute method marked with #BeforeClass annotation

Here's my code below, testSample() gets executed successfully. Please suggest what could possibly be wrong
class DataServiceTest extends GrailsUnitTestCase{
#BeforeClass
static void onceExecutedBeforeAll() {
println(" Print before Start Test Cases");
}
#Test
public void testSample(){
println(" Inside Sample");
}
}

You can't extend a TestCase and use annotations at the same time. If you want to create a test suite with annotations, you can use #RunWith annotation:
#RunWith(Suite.class)
#Suite.SuiteClasses({ DataServiceTest.class, OtherTest.class })
public class AllTests {
// empty
}
public class DataServiceTest { // no extends here
#BeforeClass
static void onceExecutedBeforeAll() {
println(" Print before Start Test Cases");
}
#Test
public void testSample(){
println(" Inside Sample");
}
}
Another option using JUnit could be annotating the method with #Before and removing extends GrailsUnitTestCase from the class.

How can I add an instance of test case into junit4 test suite without annotation/class

I have some test casees declared following JUnit4 annotation #Test like below:
public class SampleTest {
#Test
public void execute() {
}
}
And I define a test suite declared like below:
public class FacadeMockTestSuite extends TestSuite {
public static Test suite() {
TestSuite suite = new TestSuite("My Test");
// ...
return suite;
}
}
When I tried to add my test case into the suite, I found I can only use the class of the case, through either #SuiteClass or suite.addTest(new JUnit4TestAdapter(myTestClass));
But how can I directly insert a test case instance created by myself into the suite? Since I need to scan test case classes in my runtime and create them with non-default constructor?

Run single test within a test suite in Eclipse

I always enjoyed running only one test of a test class. Now I'm using test suites to order my tests by tested methods into separate classes. However, Eclipse is not running the #BeforeClass-method if I want to run a single test of a test suite.
I have the following test setup:
#RunWith(Suite.class)
#SuiteClasses({ Test1.class, Test2.class })
public class TestSuite {
#BeforeClass
public static void setup (){
// essential stuff for Test1#someTest
}
public static class Test1{
#Test
public void someTest(){}
}
}
When I run someTest, it fails because TestSuite#setup isn't run. Is there a way to fix this?

If you just execute Test1, then JUnit doesn't know about TestSuite, so #BeforeClass is not picked up. You can add a #BeforeClass to Test1 that calls TestSuite.setup(). That will also require adding a static flag in TestSuite so it only executes once.
#RunWith(Suite.class)
#SuiteClasses({ Test1.class, Test2.class })
public class TestSuite {
private static boolean initialized;
#BeforeClass
public static void setup (){
if(initialized)
return;
initialized = true;
System.out.println("setup");
// essential stuff for Test1#someTest
}
public static class Test1{
#BeforeClass
public static void setup (){
TestSuite.setup();
}
#Test
public void someTest(){
System.out.println("someTest");
}
}
}

No tests found in junit4

I am trying to use the Junit4 i using the below clases
public class Example extends TestCase {
public Example(String name) {
super(name);
}
#Test
public void exampletest() {
//TO DO
}
}
#RunWith(Suite.class)
#SuiteClasses({ Example.class })
public class Tests {
TestSuite tests = new TestSuite();
tests.addTest(new Example("exampletest"));
}
It gives me No tests found in junit4 exception some one can tell me why i get this exception
Or give an example how to do it?

In JUnit4, you don't make your test cases extend TestCase. But if you do, then your #Test annotations are ignored, and you have to prepend test method names by test.
Try this code:
Example.java:
import org.junit.Test;
public class Example {
#Test
public void exampletest() {
//TO DO
}
}
Tests.java:
#RunWith(Suite.class)
#SuiteClasses({ Example.class })
public class Tests {
}