Suppressed Exceptions in Java: Explanation & Practice

Problem summary

When close() throws an exception, it gets suppressed. Access and print suppressed exceptions.

Starter code

class Resource implements AutoCloseable {
    public void use() throws Exception {
        throw new Exception("Error during use");
    }
    
    @Override
    public void close() throws Exception {
        throw new Exception("Error during close");
    }
}

public class Main {
    public static void main(String[] args) {
        try (Resource r = new Resource()) {
            r.use();
        } catch (Exception e) {
            System.out.println("Primary: " + e.getMessage());
            for (Throwable t : e.getSuppressed()) {
                System.out.println("Suppressed: " + t.getMessage());
            }
        }
    }
}

Expected output and test cases

• Suppressed exception accessed

  Primary: Error during use
  Suppressed: Error during close

Hints

1. Primary exception is from try block
2. close() exception is suppressed
3. Use getSuppressed() to access them

Related Exception Handling exercises

• Practice Exception Chaining in Java
• Practice Custom AutoCloseable in Java
• Practice Validation with Exceptions in Java

Practice all Exception Handling exercises · Run this idea in the Java compiler