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How to get stack trace using thread in Java 9?
Java 9 has added StackWalker class to provide a standard API for accessing the current thread stack. In the previous java versions, we can use Throwable::getStackTrace, Thread::getStackTrace, and SecurityManager:: GetClassContext provided methods to obtain the thread stack.
Thread.getStackTrace() method will return an array of stack trace elements representing the stack dump of a thread (StackTraceElement[]). The first element of an array represents the top of a stack, it can be the last method invocation in a sequence, and the last element of an array represents the bottom of a stack, it can be the first method invocation in a sequence.
Syntax
public StackTraceElement[] getStackTrace()
Example
import java.lang.StackWalker.Option;
public class GetStackTraceTest {
public static void main(String args[]) {
GetStackTraceTest.testPrintCurrnentStackTrace();
GetStackTraceTest.testShowReflectFrames();
}
// get StackTrace using Thread
public static void testPrintCurrnentStackTrace() {
StackTraceElement[] stack = Thread.currentThread().getStackTrace();
for(StackTraceElement element : stack) {
System.out.println(element);
}
}
// SHOW_REFLECT_FRAMES
public static void print(StackWalker stackWalker) {
stackWalker.forEach(stackFrame -> System.out.printf("%6d| %s -> %s %n",
stackFrame.getLineNumber(), stackFrame.getClassName(), stackFrame.getMethodName()));
}
public static void testShowReflectFrames() {
final StackWalker stackWalker = StackWalker.getInstance(Option.SHOW_REFLECT_FRAMES);
print(stackWalker);
}
}Output
java.base/java.lang.Thread.getStackTrace(Thread.java:1654) GetStackTraceTest.testPrintCurrnentStackTrace(GetStackTraceTest.java:10) GetStackTraceTest.main(GetStackTraceTest.java:5) 17| GetStackTraceTest -> print 25| GetStackTraceTest -> testShowReflectFrames 6| GetStackTraceTest -> main
Updated on: 23-Apr-2020
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