return certificates.single() as X509Certificate
    } catch (e: NoSuchElementException) {
      throw IllegalArgumentException("failed to decode certificate", e)
    } catch (e: IllegalArgumentException) {
      throw IllegalArgumentException("failed to decode certificate", e)
    } catch (e: GeneralSecurityException) {
      throw IllegalArgumentException("failed to decode certificate", e)
    }

            .socket(sslSocket.asBufferedSocket(), sslSocket.peerName())
            .listener(this)
            .build()
        connection.start()
      } catch (e: IOException) {
        logger.log(Level.INFO, "Http2Server connection failure: $e")
        socket?.closeQuietly()
      } catch (e: Exception) {
        logger.log(Level.WARNING, "Http2Server unexpected failure", e)
        socket?.closeQuietly()
      }
    }
  }

        // Verify constructor exists with Context parameter
        try {
            FessWebResourceRoot.class.getConstructor(Context.class);
            assertTrue("Constructor with Context parameter exists", true);
        } catch (final NoSuchMethodException e) {
            fail("Constructor with Context parameter should exist");
        }
    }

    @Test
    public void test_methodsExist() {

                null);

        assertFalse(durableInfo.isExpired());

        // Wait for expiration
        try {
            Thread.sleep(150);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }

        assertTrue(durableInfo.isExpired());

        // Test persistent handle (never expires)

            assertNotNull(result);
        } catch (Exception e) {
            assertTrue(true);
        }
    }

    @Test
    public void test_createHighlightInfo() {
        ViewHelper viewHelper = new ViewHelper();
        viewHelper.init();

        try {
            assertNotNull(viewHelper.createHighlightInfo());
        } catch (Exception e) {
            assertTrue(true);
        }

        try {
            provider.provide(null);
            fail("Should throw exception for null classification name");
        } catch (ProvidedClassificationNotFoundException e) {
            // expected
            assertTrue(e.getMessage().contains("Not found the classification: null"));
        } catch (NullPointerException e) {
            // Also acceptable if null is not handled explicitly
        }
    }

    @Test

    }

    @Test
    public void test_throwAndCatch() {
        // Test throwing and catching the exception
        String message = "Throw and catch test";

        try {
            throw new SearchEngineClientException(message);
        } catch (SearchEngineClientException e) {
            assertEquals(message, e.getMessage());
            assertNull(e.getCause());
        }
    }

    @Test

@J2ktIncompatible
public class ListenableFutureTest extends TestCase {
  public void testNoNewApis() throws Exception {
    assertWithMessage(
            "Do not add new methods to ListenableFuture. Its API needs to continue to match the"
                + " version we released in a separate artifact com.google.guava:listenablefuture.")
        .that(ListenableFuture.class.getDeclaredMethods())
        .asList()
        .containsExactly(

                try {
                    File tempFile = File.createTempFile(prefix, suffix);
                    tempFile.deleteOnExit();
                    return tempFile;
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        };
        systemHelper.init();
        ComponentUtil.register(systemHelper, "systemHelper");

        try {
          testEqualsUsing(factory);
          return;
        } catch (ParameterNotInstantiableException e) {
          paramErrors.add(e);
        } catch (ParameterHasNoDistinctValueException e) {
          distinctValueErrors.add(e);
        } catch (InvocationTargetException e) {
          instantiationExceptions.add(e);
        } catch (FactoryMethodReturnsNullException e) {
          nullErrors.add(e);
        }