Java - Retrieve suppressed exceptions via getSuppressed() method in Throwable class.

  1. HOME
  2. Java
  3. Exception
  4. Methods from Throwable class.

Introduction

getSuppressed() method of the Throwable class returns an array of Throwable objects.

Each object in the array represents a suppressed exception.

The following snippet of code demonstrates the use of the getSuppressed() method to retrieve the suppressed exceptions:

Demo

class MyResource implements AutoCloseable {
  private int level;
  private boolean exceptionOnClose;

  public MyResource(int level, boolean exceptionOnClose) {
    this.level = level;
    this.exceptionOnClose = exceptionOnClose;
    System.out.println("Creating MyResource. Level = " + level);
  }/*from   w w  w.  jav  a2 s  .c  o m*/

  public void use() {
    if (level <= 0) {
      throw new RuntimeException("Low in level.");
    }
    System.out.println("Using MyResource level " + this.level);
    level--;
  }

  @Override
  public void close() {
    if (exceptionOnClose) {
      throw new RuntimeException("Error in closing");
    }
    System.out.println("Closing MyResource...");
  }
}

public class Main {
  public static void main(String[] args) {
    try (MyResource mr = new MyResource(2, true)) {
      mr.use();
      mr.use();
      mr.use(); // Throws an exception
    } catch (Exception e) {
      System.out.println(e.getMessage());

      // Display messages of suppressed exceptions
      System.out.println("Suppressed exception messages are...");
      for (Throwable t : e.getSuppressed()) {
        System.out.println(t.getMessage());
      }
    }

  }
}

Result

Related Topic