Java Throwable printStackTrace() Method

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Description

The Java Throwable printStackTrace(PrintStream s) method prints this throwable and its backtrace to the specified print stream.

Declaration

Following is the declaration for java.lang.Throwable.printStackTrace() method

public void printStackTrace(PrintStream s)

Parameters

s − This is the PrintStream to use for output

Return Value

This method does not return any value.

Exception

NA

Example: Printing Stacktrace of Throwable

The following example shows the usage of Java Throwable printStackTrace() method. We've defined a method raiseException() which throws a Throwable after setting the Stacktrace. In main method, raiseException() method is called and in catch block exception stack trace is retrieved and printed using printStackTrace() method.

package com.tutorialspoint;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;

public class ThrowableDemo {

   public static void main(String[] args) throws Throwable {

      OutputStream out;
      try {
         raiseException();
      } catch(Throwable e) {
         out = new FileOutputStream("file.text");
         // prints this throwable and its backtrace to the print stream
         PrintStream ps = new PrintStream(out);      
         e.printStackTrace(ps);
      }
   }
  
   public static void raiseException() throws Throwable {

      Throwable t = new Throwable("This is new Exception...");
      StackTraceElement[] trace = new StackTraceElement[] {
         new StackTraceElement("ClassName","methodName","fileName",10)
      };

      // sets the stack trace elements
      t.setStackTrace(trace);
      throw t;
   }
}

Output

Let us assume we have a text file file.txt which gets generated as an output for our example program.The file content consist of −

java.lang.Throwable: This is new Exception...
	at ClassName.methodName(fileName:10)

Example: Printing Stacktrace of Exception

The following example shows the usage of Java Throwable printStackTrace() method. We've defined a method raiseException() which throws an Exception after setting the Stacktrace. In main method, raiseException() method is called and in catch block exception stack trace is retrieved and printed using printStackTrace() method.

package com.tutorialspoint;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;

public class ThrowableDemo {

   public static void main(String[] args) throws Throwable {

      OutputStream out;
      try {
         raiseException();
      } catch(Throwable e) {
         out = new FileOutputStream("file.text");
         // prints this throwable and its backtrace to the print stream
         PrintStream ps = new PrintStream(out);      
         e.printStackTrace(ps);
      }
   }
  
   public static void raiseException() throws Exception {

      Exception t = new Exception("This is new Exception...");
      StackTraceElement[] trace = new StackTraceElement[] {
         new StackTraceElement("ClassName","methodName","fileName",10)
      };

      // sets the stack trace elements
      t.setStackTrace(trace);
      throw t;
   }
}

Output

Let us assume we have a text file file.txt which gets generated as an output for our example program.The file content consist of −

java.lang.Exception: This is new Exception...
	at ClassName.methodName(fileName:10)

Example: Printing Stacktrace of RuntimeException

The following example shows the usage of Java Throwable printStackTrace() method. We've defined a method raiseException() which throws a RuntimeException after setting the Stacktrace. In main method, raiseException() method is called and in catch block exception stack trace is retrieved and printed using printStackTrace() method.

package com.tutorialspoint;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;

public class ThrowableDemo {

   public static void main(String[] args) throws Throwable {

      OutputStream out;
      try {
         raiseException();
      } catch(Throwable e) {
         out = new FileOutputStream("file.text");
         // prints this throwable and its backtrace to the print stream
         PrintStream ps = new PrintStream(out);      
         e.printStackTrace(ps);
      }
   }
  
   public static void raiseException() throws RuntimeException {

      RuntimeException t = new RuntimeException("This is new Exception...");
      StackTraceElement[] trace = new StackTraceElement[] {
         new StackTraceElement("ClassName","methodName","fileName",10)
      };

      // sets the stack trace elements
      t.setStackTrace(trace);
      throw t;
   }
}

Output

Let us assume we have a text file file.txt which gets generated as an output for our example program.The file content consist of −

java.lang.RuntimeException: This is new Exception...
	at ClassName.methodName(fileName:10)