Java.lang.Throwable.getCause() Method

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Description

The java.lang.Throwable.getCause() method returns the cause of this throwable or null if the cause is nonexistent or unknown

Declaration

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

public Throwable getCause()

Parameters

NA

Return Value

This method returns the cause of this throwable or null if the cause is nonexistent or unknown.

Exception

NA

Example

The following example shows the usage of java.lang.Throwable.getCause() method.

package com.tutorialspoint;

import java.lang.*;

public class ThrowableDemo {

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

      try {
         newException();
      } catch(Throwable e) {
         System.err.println(e);
         // returns null as the cause is nonexistent or unknown.
         System.err.println("Cause = " + e.getCause());
      }
   }
  
   public static void newException() throws Exception {
      System.out.println("This is newException() function");
      throw new Exception("Exception...");
   }
}
 

Let us compile and run the above program, this will produce the following result −

This is newException() function
java.lang.Exception: Exception...
Cause = null