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Java Throwable setStackTrace() Method with Example

Throwable Class setStackTrace() method: Here, we are going to learn about the setStackTrace() method of Throwable Class with its syntax and example.
Submitted by Preeti Jain, on January 06, 2020

Throwable Class setStackTrace() method

• setStackTrace() Method is available in java.lang package.
• setStackTrace() Method is used to sets stack trace elements that will be retrieved by using getStackTrace() method.
• setStackTrace() Method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• setStackTrace() Method may throw an exception at the time of setting stack trace elements.
  NullPointerException – This exception may throw when the given argument is null or when any of its existing elements of the stack trace is null.

Syntax:

    public void setStackTrace(StackTraceElement[] st_tr);

Parameter(s):

• StackTraceElement[] st_tr – represents an array of "StackTraceElement".

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void setStackTrace(StackTraceElement[] st_tr)
// method of Throwable 

public class SetStackTrace {
    public static void main(String args[]) {
        try {
            stackTraceMethod();
        } catch (Throwable ex) {

            // By using getStackTrace() method is to get the
            // stack trace element
            StackTraceElement[] st_tr = ex.getStackTrace();
            System.err.println("st_tr[0].toString()" + st_tr[0].toString());
        }
    }

    public static void stackTraceMethod() throws Throwable {
        int li_nu = 7;
        // instantiate a new exception called 
        // Throwable
        Throwable th = new Throwable("Raise New Exception");
        StackTraceElement[] st_tr = new StackTraceElement[] {
            new StackTraceElement("cl_na", "me_na", "fu_na", li_nu)
        };

        // By using setStackTrace() method is to set
        // the elements in stack
        th.setStackTrace(st_tr);
        throw th;
    }
}

Output

st_tr[0].toString()cl_na.me_na(fu_na:7)