# trace cross thread
* Dependency the toolkit, such as using maven or gradle
```xml
org.apache.skywalking
apm-toolkit-trace
${skywalking.version}
```
* usage 1.
```java
@TraceCrossThread
public static class MyCallable implements Callable {
@Override
public String call() throws Exception {
return null;
}
}
...
ExecutorService executorService = Executors.newFixedThreadPool(1);
executorService.submit(new MyCallable());
```
* usage 2.
```java
ExecutorService executorService = Executors.newFixedThreadPool(1);
executorService.submit(CallableWrapper.of(new Callable() {
@Override public String call() throws Exception {
return null;
}
}));
```
or
```java
ExecutorService executorService = Executors.newFixedThreadPool(1);
executorService.execute(RunnableWrapper.of(new Runnable() {
@Override public void run() {
//your code
}
}));
```
* usage 3.
```java
@TraceCrossThread
public class MySupplier implements Supplier {
@Override
public String get() {
return null;
}
}
...
CompletableFuture.supplyAsync(new MySupplier());
```
or
```java
CompletableFuture.supplyAsync(SupplierWrapper.of(()->{
return "SupplierWrapper";
})).thenAccept(System.out::println);
```
_Sample codes only_