Remove com.yahoo.vespa.jdk8compat

These types are often accidentally imported, and the JDK8 replacement is typically a one-liner.

21 files changed, 50 insertions, 122 deletions

diff --git a/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterStateGeneratorTest.java b/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterStateGeneratorTest.java
index ba3a1dd7d26..d5d6c4623f2 100644
--- a/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterStateGeneratorTest.java
+++ b/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterStateGeneratorTest.java
@@ -7,18 +7,17 @@ import com.yahoo.vdslib.state.Node;
 import com.yahoo.vdslib.state.NodeState;
 import com.yahoo.vdslib.state.NodeType;
 import com.yahoo.vdslib.state.State;
-import com.yahoo.vespa.jdk8compat.Set;
 import org.junit.Test;
 
 import java.util.Optional;
+import java.util.Set;
 
-import static com.yahoo.vespa.clustercontroller.core.matchers.HasStateReasonForNode.hasStateReasonForNode;
-import static com.yahoo.vespa.clustercontroller.core.ClusterFixture.storageNode;
 import static com.yahoo.vespa.clustercontroller.core.ClusterFixture.distributorNode;
-
+import static com.yahoo.vespa.clustercontroller.core.ClusterFixture.storageNode;
+import static com.yahoo.vespa.clustercontroller.core.matchers.HasStateReasonForNode.hasStateReasonForNode;
 import static org.hamcrest.CoreMatchers.not;
-import static org.hamcrest.core.IsEqual.equalTo;
 import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsEqual.equalTo;
 import static org.junit.Assert.assertThat;
 
 public class ClusterStateGeneratorTest {
diff --git a/configserver-flags/src/test/java/com/yahoo/vespa/configserver/flags/http/FlagsHandlerTest.java b/configserver-flags/src/test/java/com/yahoo/vespa/configserver/flags/http/FlagsHandlerTest.java
index a833d4d1608..9252d6a4073 100644
--- a/configserver-flags/src/test/java/com/yahoo/vespa/configserver/flags/http/FlagsHandlerTest.java
+++ b/configserver-flags/src/test/java/com/yahoo/vespa/configserver/flags/http/FlagsHandlerTest.java
@@ -12,7 +12,6 @@ import com.yahoo.vespa.flags.FetchVector;
 import com.yahoo.vespa.flags.FlagId;
 import com.yahoo.vespa.flags.Flags;
 import com.yahoo.vespa.flags.UnboundBooleanFlag;
-import com.yahoo.vespa.jdk8compat.List;
 import com.yahoo.yolean.Exceptions;
 import org.junit.Test;
 
@@ -20,6 +19,7 @@ import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
+import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
diff --git a/container-core/src/main/java/com/yahoo/container/handler/metrics/PrometheusV1Handler.java b/container-core/src/main/java/com/yahoo/container/handler/metrics/PrometheusV1Handler.java
index 00fb488489e..33c6fbefa71 100644
--- a/container-core/src/main/java/com/yahoo/container/handler/metrics/PrometheusV1Handler.java
+++ b/container-core/src/main/java/com/yahoo/container/handler/metrics/PrometheusV1Handler.java
@@ -5,18 +5,19 @@ import com.google.inject.Inject;
 import com.yahoo.container.jdisc.HttpResponse;
 import com.yahoo.restapi.Path;
 import com.yahoo.restapi.StringResponse;
-import com.yahoo.vespa.jdk8compat.List;
 import com.yahoo.yolean.Exceptions;
-import java.io.IOException;
-import java.net.URI;
-import java.util.Optional;
-import java.util.concurrent.Executor;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.config.RequestConfig;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.BasicResponseHandler;
 import org.apache.http.impl.client.CloseableHttpClient;
 
+import java.io.IOException;
+import java.net.URI;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.Executor;
+
 import static com.yahoo.container.handler.metrics.MetricsV2Handler.consumerQuery;
 import static com.yahoo.jdisc.Response.Status.INTERNAL_SERVER_ERROR;
 
diff --git a/http-utils/src/test/java/ai/vespa/util/http/retry/DelayedConnectionLevelRetryHandlerTest.java b/http-utils/src/test/java/ai/vespa/util/http/retry/DelayedConnectionLevelRetryHandlerTest.java
index 85adeae6d78..82bf4ff8080 100644
--- a/http-utils/src/test/java/ai/vespa/util/http/retry/DelayedConnectionLevelRetryHandlerTest.java
+++ b/http-utils/src/test/java/ai/vespa/util/http/retry/DelayedConnectionLevelRetryHandlerTest.java
@@ -1,7 +1,6 @@
 // Copyright 2020 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package ai.vespa.util.http.retry;
 
-import com.yahoo.vespa.jdk8compat.List;
 import org.apache.http.client.protocol.HttpClientContext;
 import org.junit.Test;
 
@@ -9,6 +8,7 @@ import javax.net.ssl.SSLException;
 import java.io.IOException;
 import java.net.ConnectException;
 import java.time.Duration;
+import java.util.Arrays;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -105,7 +105,7 @@ public class DelayedConnectionLevelRetryHandlerTest {
 
         DelayedConnectionLevelRetryHandler handler = DelayedConnectionLevelRetryHandler.Builder
                 .withFixedDelay(Duration.ofSeconds(2), maxRetries)
-                .retryForExceptions(List.of(SSLException.class, ConnectException.class))
+                .retryForExceptions(Arrays.asList(SSLException.class, ConnectException.class))
                 .withSleeper(mock(Sleeper.class))
                 .build();
 
@@ -122,7 +122,7 @@ public class DelayedConnectionLevelRetryHandlerTest {
     public void does_not_retry_for_non_listed_exception() {
         DelayedConnectionLevelRetryHandler handler = DelayedConnectionLevelRetryHandler.Builder
                 .withFixedDelay(Duration.ofSeconds(2), 2)
-                .retryForExceptions(List.of(SSLException.class, ConnectException.class))
+                .retryForExceptions(Arrays.asList(SSLException.class, ConnectException.class))
                 .withSleeper(mock(Sleeper.class))
                 .build();
 
diff --git a/http-utils/src/test/java/ai/vespa/util/http/retry/DelayedResponseLevelRetryHandlerTest.java b/http-utils/src/test/java/ai/vespa/util/http/retry/DelayedResponseLevelRetryHandlerTest.java
index dbc93f28d6b..b1d78fc09eb 100644
--- a/http-utils/src/test/java/ai/vespa/util/http/retry/DelayedResponseLevelRetryHandlerTest.java
+++ b/http-utils/src/test/java/ai/vespa/util/http/retry/DelayedResponseLevelRetryHandlerTest.java
@@ -9,6 +9,7 @@ import org.apache.http.message.BasicStatusLine;
 import org.junit.Test;
 
 import java.time.Duration;
+import java.util.Arrays;
 import java.util.List;
 
 import static org.junit.Assert.assertEquals;
@@ -82,7 +83,7 @@ public class DelayedResponseLevelRetryHandlerTest {
         HttpClientContext ctx = new HttpClientContext();
         int lastExecutionCount = maxRetries + 1;
         List<Duration> expectedIntervals =
-                com.yahoo.vespa.jdk8compat.List.of(
+                Arrays.asList(
                         startDelay, Duration.ofSeconds(1), Duration.ofSeconds(2), Duration.ofSeconds(4),
                         Duration.ofSeconds(5), Duration.ofSeconds(5), Duration.ofSeconds(5), Duration.ofSeconds(5),
                         Duration.ofSeconds(5), Duration.ofSeconds(5), Duration.ofSeconds(5));
@@ -98,7 +99,7 @@ public class DelayedResponseLevelRetryHandlerTest {
 
         DelayedResponseLevelRetryHandler handler = DelayedResponseLevelRetryHandler.Builder
                 .withFixedDelay(Duration.ofSeconds(2), maxRetries)
-                .retryForStatusCodes(com.yahoo.vespa.jdk8compat.List.of(HttpStatus.SC_SERVICE_UNAVAILABLE, HttpStatus.SC_BAD_GATEWAY))
+                .retryForStatusCodes(Arrays.asList(HttpStatus.SC_SERVICE_UNAVAILABLE, HttpStatus.SC_BAD_GATEWAY))
                 .build();
 
         HttpResponse response = createResponse(HttpStatus.SC_SERVICE_UNAVAILABLE);
@@ -114,7 +115,7 @@ public class DelayedResponseLevelRetryHandlerTest {
     public void does_not_retry_for_non_listed_exception() {
         DelayedResponseLevelRetryHandler handler = DelayedResponseLevelRetryHandler.Builder
                 .withFixedDelay(Duration.ofSeconds(2), 2)
-                .retryForStatusCodes(com.yahoo.vespa.jdk8compat.List.of(HttpStatus.SC_SERVICE_UNAVAILABLE, HttpStatus.SC_BAD_GATEWAY))
+                .retryForStatusCodes(Arrays.asList(HttpStatus.SC_SERVICE_UNAVAILABLE, HttpStatus.SC_BAD_GATEWAY))
                 .build();
 
         HttpResponse response = createResponse(HttpStatus.SC_OK);
diff --git a/jdisc_http_service/src/test/java/com/yahoo/container/logging/JsonConnectionLogWriterTest.java b/jdisc_http_service/src/test/java/com/yahoo/container/logging/JsonConnectionLogWriterTest.java
index 8944ae9d288..15118b23f85 100644
--- a/jdisc_http_service/src/test/java/com/yahoo/container/logging/JsonConnectionLogWriterTest.java
+++ b/jdisc_http_service/src/test/java/com/yahoo/container/logging/JsonConnectionLogWriterTest.java
@@ -1,13 +1,13 @@
 package com.yahoo.container.logging;// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 
 import com.yahoo.test.json.JsonTestHelper;
-import com.yahoo.vespa.jdk8compat.List;
 import org.junit.jupiter.api.Test;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.time.Instant;
+import java.util.List;
 import java.util.UUID;
 
 /**
diff --git a/security-utils/src/main/java/com/yahoo/security/tls/AutoReloadingX509KeyManager.java b/security-utils/src/main/java/com/yahoo/security/tls/AutoReloadingX509KeyManager.java
index d4e74e22e40..4d6b160db18 100644
--- a/security-utils/src/main/java/com/yahoo/security/tls/AutoReloadingX509KeyManager.java
+++ b/security-utils/src/main/java/com/yahoo/security/tls/AutoReloadingX509KeyManager.java
@@ -12,6 +12,8 @@ import javax.net.ssl.X509ExtendedKeyManager;
 import java.io.IOException;
 import java.io.UncheckedIOException;
 import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.KeyStore;
 import java.security.Principal;
@@ -72,8 +74,8 @@ public class AutoReloadingX509KeyManager extends X509ExtendedKeyManager implemen
             return KeyStoreBuilder.withType(KeyStoreType.PKCS12)
                     .withKeyEntry(
                             CERTIFICATE_ALIAS,
-                            KeyUtils.fromPemEncodedPrivateKey(com.yahoo.vespa.jdk8compat.Files.readString(privateKey)),
-                            X509CertificateUtils.certificateListFromPem(com.yahoo.vespa.jdk8compat.Files.readString(certificateChain)))
+                            KeyUtils.fromPemEncodedPrivateKey(new String(Files.readAllBytes(privateKey), StandardCharsets.UTF_8)),
+                            X509CertificateUtils.certificateListFromPem(new String(Files.readAllBytes(certificateChain), StandardCharsets.UTF_8)))
                     .build();
         } catch (IOException e) {
             throw new UncheckedIOException(e);
diff --git a/security-utils/src/main/java/com/yahoo/security/tls/ConfigFileBasedTlsContext.java b/security-utils/src/main/java/com/yahoo/security/tls/ConfigFileBasedTlsContext.java
index acc70d50d6a..bc1f1dcc6f6 100644
--- a/security-utils/src/main/java/com/yahoo/security/tls/ConfigFileBasedTlsContext.java
+++ b/security-utils/src/main/java/com/yahoo/security/tls/ConfigFileBasedTlsContext.java
@@ -14,9 +14,12 @@ import javax.net.ssl.SSLEngine;
 import javax.net.ssl.SSLParameters;
 import java.io.IOException;
 import java.io.UncheckedIOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.KeyStore;
 import java.time.Duration;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -82,7 +85,7 @@ public class ConfigFileBasedTlsContext implements TlsContext {
     private static KeyStore loadTruststore(Path caCertificateFile) {
         try {
             return KeyStoreBuilder.withType(KeyStoreType.PKCS12)
-                    .withCertificateEntries("cert", X509CertificateUtils.certificateListFromPem(com.yahoo.vespa.jdk8compat.Files.readString(caCertificateFile)))
+                    .withCertificateEntries("cert", X509CertificateUtils.certificateListFromPem(new String(Files.readAllBytes(caCertificateFile), StandardCharsets.UTF_8)))
                     .build();
         } catch (IOException e) {
             throw new UncheckedIOException(e);
@@ -94,8 +97,8 @@ public class ConfigFileBasedTlsContext implements TlsContext {
             return KeyStoreBuilder.withType(KeyStoreType.PKCS12)
                     .withKeyEntry(
                             "default",
-                            KeyUtils.fromPemEncodedPrivateKey(com.yahoo.vespa.jdk8compat.Files.readString(privateKeyFile)),
-                            X509CertificateUtils.certificateListFromPem(com.yahoo.vespa.jdk8compat.Files.readString(certificatesFile)))
+                            KeyUtils.fromPemEncodedPrivateKey(new String(Files.readAllBytes(privateKeyFile), StandardCharsets.UTF_8)),
+                            X509CertificateUtils.certificateListFromPem(new String(Files.readAllBytes(certificatesFile), StandardCharsets.UTF_8)))
                     .build();
         } catch (IOException e) {
             throw new UncheckedIOException(e);
@@ -111,7 +114,7 @@ public class ConfigFileBasedTlsContext implements TlsContext {
         HostnameVerification hostnameVerification = options.isHostnameValidationDisabled() ? HostnameVerification.DISABLED : HostnameVerification.ENABLED;
         PeerAuthorizerTrustManager authorizerTrustManager = options.getAuthorizedPeers()
                 .map(authorizedPeers -> new PeerAuthorizerTrustManager(authorizedPeers, mode, hostnameVerification, mutableTrustManager))
-                .orElseGet(() -> new PeerAuthorizerTrustManager(new AuthorizedPeers(com.yahoo.vespa.jdk8compat.Set.of()), AuthorizationMode.DISABLE, hostnameVerification, mutableTrustManager));
+                .orElseGet(() -> new PeerAuthorizerTrustManager(new AuthorizedPeers(Collections.emptySet()), AuthorizationMode.DISABLE, hostnameVerification, mutableTrustManager));
         SSLContext sslContext = new SslContextBuilder()
                 .withKeyManager(mutableKeyManager)
                 .withTrustManager(authorizerTrustManager)
diff --git a/security-utils/src/main/java/com/yahoo/security/tls/DefaultTlsContext.java b/security-utils/src/main/java/com/yahoo/security/tls/DefaultTlsContext.java
index 250596628ee..56f2ecb8efc 100644
--- a/security-utils/src/main/java/com/yahoo/security/tls/DefaultTlsContext.java
+++ b/security-utils/src/main/java/com/yahoo/security/tls/DefaultTlsContext.java
@@ -11,6 +11,7 @@ import javax.net.ssl.SSLParameters;
 import java.security.PrivateKey;
 import java.security.cert.X509Certificate;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 import java.util.logging.Level;
@@ -61,7 +62,7 @@ public class DefaultTlsContext implements TlsContext {
                     String.format("None of the accepted ciphers are supported (supported=%s, accepted=%s)",
                                   supportedCiphers, acceptedCiphers));
         }
-        log.log(Level.FINE, () -> String.format("Allowed cipher suites that are supported: %s", com.yahoo.vespa.jdk8compat.List.of(allowedCiphers)));
+        log.log(Level.FINE, () -> String.format("Allowed cipher suites that are supported: %s", Arrays.asList(allowedCiphers)));
         return allowedCiphers;
     }
 
@@ -139,7 +140,7 @@ public class DefaultTlsContext implements TlsContext {
             builder.withTrustManagerFactory(truststore -> new PeerAuthorizerTrustManager(authorizedPeers, mode, hostnameVerification, truststore));
         } else {
             builder.withTrustManagerFactory(truststore -> new PeerAuthorizerTrustManager(
-                    new AuthorizedPeers(com.yahoo.vespa.jdk8compat.Set.of()), AuthorizationMode.DISABLE, hostnameVerification, truststore));
+                    new AuthorizedPeers(Collections.emptySet()), AuthorizationMode.DISABLE, hostnameVerification, truststore));
         }
         return builder.build();
     }
diff --git a/security-utils/src/main/java/com/yahoo/security/tls/KeyManagerUtils.java b/security-utils/src/main/java/com/yahoo/security/tls/KeyManagerUtils.java
index c60f13f9729..a3b438fcc65 100644
--- a/security-utils/src/main/java/com/yahoo/security/tls/KeyManagerUtils.java
+++ b/security-utils/src/main/java/com/yahoo/security/tls/KeyManagerUtils.java
@@ -30,7 +30,7 @@ public class KeyManagerUtils {
                     .filter(manager -> manager instanceof X509ExtendedKeyManager)
                     .map(X509ExtendedKeyManager.class::cast)
                     .findFirst()
-                    .orElseThrow(() -> new RuntimeException("No X509ExtendedKeyManager in " + com.yahoo.vespa.jdk8compat.List.of(keyManagers)));
+                    .orElseThrow(() -> new RuntimeException("No X509ExtendedKeyManager in " + Arrays.asList(keyManagers)));
         } catch (GeneralSecurityException e) {
             throw new RuntimeException(e);
         }
diff --git a/security-utils/src/main/java/com/yahoo/security/tls/TlsContext.java b/security-utils/src/main/java/com/yahoo/security/tls/TlsContext.java
index eef05d4f4f2..1f78dc9d481 100644
--- a/security-utils/src/main/java/com/yahoo/security/tls/TlsContext.java
+++ b/security-utils/src/main/java/com/yahoo/security/tls/TlsContext.java
@@ -5,6 +5,8 @@ import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLEngine;
 import javax.net.ssl.SSLParameters;
 import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
 import java.util.Set;
 
 import static java.util.stream.Collectors.toSet;
@@ -23,7 +25,7 @@ public interface TlsContext extends AutoCloseable {
      * For TLSv1.3 we allow the DEFAULT group ciphers.
      * Note that we _only_ allow AEAD ciphers for either TLS version.
      */
-    Set<String> ALLOWED_CIPHER_SUITES = com.yahoo.vespa.jdk8compat.Set.of(
+    Set<String> ALLOWED_CIPHER_SUITES = Collections.unmodifiableSet(new HashSet<>(Arrays.asList(
             "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
             "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
             "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256", // Java 12
@@ -32,10 +34,10 @@ public interface TlsContext extends AutoCloseable {
             "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
             "TLS_AES_128_GCM_SHA256", // TLSv1.3
             "TLS_AES_256_GCM_SHA384", // TLSv1.3
-            "TLS_CHACHA20_POLY1305_SHA256"); // TLSv1.3, Java 12
+            "TLS_CHACHA20_POLY1305_SHA256"))); // TLSv1.3, Java 12
 
     // TODO Enable TLSv1.3 after upgrading to JDK 17
-    Set<String> ALLOWED_PROTOCOLS = com.yahoo.vespa.jdk8compat.Set.of("TLSv1.2");
+    Set<String> ALLOWED_PROTOCOLS = Collections.singleton("TLSv1.2");
     String SSL_CONTEXT_VERSION = "TLS"; // Use SSLContext implementations that supports all TLS versions
 
     /**
diff --git a/security-utils/src/main/java/com/yahoo/security/tls/TrustManagerUtils.java b/security-utils/src/main/java/com/yahoo/security/tls/TrustManagerUtils.java
index 17f56011261..cb8c6e53555 100644
--- a/security-utils/src/main/java/com/yahoo/security/tls/TrustManagerUtils.java
+++ b/security-utils/src/main/java/com/yahoo/security/tls/TrustManagerUtils.java
@@ -29,7 +29,7 @@ public class TrustManagerUtils {
                     .filter(manager -> manager instanceof X509ExtendedTrustManager)
                     .map(X509ExtendedTrustManager.class::cast)
                     .findFirst()
-                    .orElseThrow(() -> new RuntimeException("No X509ExtendedTrustManager in " + com.yahoo.vespa.jdk8compat.List.of(trustManagers)));
+                    .orElseThrow(() -> new RuntimeException("No X509ExtendedTrustManager in " + Arrays.asList(trustManagers)));
         } catch (GeneralSecurityException e) {
             throw new RuntimeException(e);
         }
diff --git a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Collection.java b/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Collection.java
deleted file mode 100644
index fbfea01b2c7..00000000000
--- a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Collection.java
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-package com.yahoo.vespa.jdk8compat;
-
-import java.util.function.IntFunction;
-
-/**
- * Backport of new {@link java.util.Collection} methods added after JDK8
- *
- * @author bjorncs
- */
-public interface Collection {
-    static <T> T[] toArray(java.util.Collection<T> collection, IntFunction<T[]> generator) {
-        return collection.toArray(generator.apply(collection.size()));
-    }
-
-}
diff --git a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Files.java b/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Files.java
deleted file mode 100644
index cc3bd698cd5..00000000000
--- a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Files.java
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-package com.yahoo.vespa.jdk8compat;
-
-import java.io.IOException;
-import java.nio.charset.StandardCharsets;
-import java.nio.file.OpenOption;
-import java.nio.file.Path;
-
-/**
- * Backport of new {@link java.nio.file.Files} methods added after JDK8
- *
- * @author bjorncs
- */
-public interface Files {
-
-    static String readString(Path path) throws IOException {
-        byte[] bytes = java.nio.file.Files.readAllBytes(path);
-        return new String(bytes, StandardCharsets.UTF_8);
-    }
-
-    static Path writeString(Path path, CharSequence string, OpenOption... options) throws IOException {
-        return java.nio.file.Files.write(path, string.toString().getBytes(), options);
-    }
-}
diff --git a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/List.java b/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/List.java
deleted file mode 100644
index f57834e93cb..00000000000
--- a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/List.java
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-package com.yahoo.vespa.jdk8compat;
-
-import java.util.Arrays;
-
-/**
- * Backport of new {@link java.util.List} methods added after JDK8
- *
- * @author bjorncs
- */
-public interface List {
-    @SafeVarargs
-    @SuppressWarnings("varargs")
-    static <E> java.util.List<E> of(E... elements) {
-        return Arrays.asList(elements);
-    }
-}
diff --git a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Set.java b/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Set.java
deleted file mode 100644
index b2c998bb716..00000000000
--- a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/Set.java
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-package com.yahoo.vespa.jdk8compat;
-
-import java.util.Arrays;
-import java.util.HashSet;
-
-/**
- * Backport of new {@link java.util.Set} methods added after JDK8
- *
- * @author bjorncs
- */
-public interface Set {
-    @SafeVarargs
-    @SuppressWarnings("varargs")
-    static <E> java.util.Set<E> of(E... elements) {
-        return new HashSet<>(Arrays.asList(elements));
-    }
-}
diff --git a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/package-info.java b/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/package-info.java
deleted file mode 100644
index 40d74321438..00000000000
--- a/security-utils/src/main/java/com/yahoo/vespa/jdk8compat/package-info.java
+++ /dev/null
@@ -1,8 +0,0 @@
-// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-/**
- * JDK8 port of types and methods added in later JDK versions.
- * TODO Remove this package once vespa-http-client/security-utils no longer targets JDK8
- *
- * @author bjorncs
- */
-package com.yahoo.vespa.jdk8compat;
\ No newline at end of file
diff --git a/security-utils/src/test/java/com/yahoo/security/tls/AutoReloadingX509KeyManagerTest.java b/security-utils/src/test/java/com/yahoo/security/tls/AutoReloadingX509KeyManagerTest.java
index 22710e7f393..024149a7282 100644
--- a/security-utils/src/test/java/com/yahoo/security/tls/AutoReloadingX509KeyManagerTest.java
+++ b/security-utils/src/test/java/com/yahoo/security/tls/AutoReloadingX509KeyManagerTest.java
@@ -15,6 +15,7 @@ import org.mockito.Mockito;
 import javax.security.auth.x500.X500Principal;
 import java.io.IOException;
 import java.math.BigInteger;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.KeyPair;
 import java.security.Principal;
@@ -41,12 +42,12 @@ public class AutoReloadingX509KeyManagerTest {
     public void crypto_material_is_reloaded_when_scheduler_task_is_executed() throws IOException {
         KeyPair keyPair = KeyUtils.generateKeypair(KeyAlgorithm.EC);
         Path privateKeyFile = tempDirectory.newFile().toPath();
-        com.yahoo.vespa.jdk8compat.Files.writeString(privateKeyFile, KeyUtils.toPem(keyPair.getPrivate()));
+        Files.write(privateKeyFile, KeyUtils.toPem(keyPair.getPrivate()).getBytes());
 
         Path certificateFile = tempDirectory.newFile().toPath();
         BigInteger serialNumberInitialCertificate = BigInteger.ONE;
         X509Certificate initialCertificate = generateCertificate(keyPair, serialNumberInitialCertificate);
-        com.yahoo.vespa.jdk8compat.Files.writeString(certificateFile, X509CertificateUtils.toPem(initialCertificate));
+        Files.write(certificateFile, X509CertificateUtils.toPem(initialCertificate).getBytes());
 
         ScheduledExecutorService scheduler = Mockito.mock(ScheduledExecutorService.class);
         ArgumentCaptor<Runnable> updaterTaskCaptor = ArgumentCaptor.forClass(Runnable.class);
@@ -61,7 +62,7 @@ public class AutoReloadingX509KeyManagerTest {
 
         BigInteger serialNumberUpdatedCertificate = BigInteger.TEN;
         X509Certificate updatedCertificate = generateCertificate(keyPair, serialNumberUpdatedCertificate);
-        com.yahoo.vespa.jdk8compat.Files.writeString(certificateFile, X509CertificateUtils.toPem(updatedCertificate));
+        Files.write(certificateFile, X509CertificateUtils.toPem(updatedCertificate).getBytes());
 
         updaterTaskCaptor.getValue().run(); // run update task in ReloadingX509KeyManager
 
diff --git a/security-utils/src/test/java/com/yahoo/security/tls/ConfigFileBasedTlsContextTest.java b/security-utils/src/test/java/com/yahoo/security/tls/ConfigFileBasedTlsContextTest.java
index 54a1e3847f9..f1c8acbaf3b 100644
--- a/security-utils/src/test/java/com/yahoo/security/tls/ConfigFileBasedTlsContextTest.java
+++ b/security-utils/src/test/java/com/yahoo/security/tls/ConfigFileBasedTlsContextTest.java
@@ -35,17 +35,17 @@ public class ConfigFileBasedTlsContextTest {
     public void can_create_sslcontext_from_credentials() throws IOException, InterruptedException {
         KeyPair keyPair = KeyUtils.generateKeypair(EC);
         Path privateKeyFile = tempDirectory.newFile().toPath();
-        com.yahoo.vespa.jdk8compat.Files.writeString(privateKeyFile, KeyUtils.toPem(keyPair.getPrivate()));
+        Files.write(privateKeyFile, KeyUtils.toPem(keyPair.getPrivate()).getBytes());
 
         X509Certificate certificate = X509CertificateBuilder
                 .fromKeypair(keyPair, new X500Principal("CN=dummy"), EPOCH, EPOCH.plus(1, DAYS), SHA256_WITH_ECDSA, BigInteger.ONE)
                 .build();
         Path certificateChainFile = tempDirectory.newFile().toPath();
         String certificatePem = X509CertificateUtils.toPem(certificate);
-        com.yahoo.vespa.jdk8compat.Files.writeString(certificateChainFile, certificatePem);
+        Files.write(certificateChainFile, certificatePem.getBytes());
 
         Path caCertificatesFile = tempDirectory.newFile().toPath();
-        com.yahoo.vespa.jdk8compat.Files.writeString(caCertificatesFile, certificatePem);
+        Files.write(caCertificatesFile, certificatePem.getBytes());
 
         TransportSecurityOptions options = new TransportSecurityOptions.Builder()
                 .withCertificates(certificateChainFile, privateKeyFile)
diff --git a/security-utils/src/test/java/com/yahoo/security/tls/TransportSecurityOptionsTest.java b/security-utils/src/test/java/com/yahoo/security/tls/TransportSecurityOptionsTest.java
index 8fd2ca065c7..43389ade275 100644
--- a/security-utils/src/test/java/com/yahoo/security/tls/TransportSecurityOptionsTest.java
+++ b/security-utils/src/test/java/com/yahoo/security/tls/TransportSecurityOptionsTest.java
@@ -8,6 +8,7 @@ import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.Arrays;
 import java.util.Collections;
 
 import static org.junit.Assert.assertEquals;
@@ -21,7 +22,7 @@ public class TransportSecurityOptionsTest {
     private static final TransportSecurityOptions OPTIONS = new TransportSecurityOptions.Builder()
             .withCertificates(Paths.get("certs.pem"), Paths.get("myhost.key"))
             .withCaCertificates(Paths.get("my_cas.pem"))
-            .withAcceptedCiphers(com.yahoo.vespa.jdk8compat.List.of("TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384" , "TLS_AES_256_GCM_SHA384"))
+            .withAcceptedCiphers(Arrays.asList("TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384", "TLS_AES_256_GCM_SHA384"))
             .withAcceptedProtocols(Collections.singletonList("TLSv1.2"))
             .withHostnameValidationDisabled(true)
             .build();
diff --git a/security-utils/src/test/java/com/yahoo/security/tls/json/TransportSecurityOptionsJsonSerializerTest.java b/security-utils/src/test/java/com/yahoo/security/tls/json/TransportSecurityOptionsJsonSerializerTest.java
index e14b3d99212..35fd25b6a62 100644
--- a/security-utils/src/test/java/com/yahoo/security/tls/json/TransportSecurityOptionsJsonSerializerTest.java
+++ b/security-utils/src/test/java/com/yahoo/security/tls/json/TransportSecurityOptionsJsonSerializerTest.java
@@ -68,7 +68,7 @@ public class TransportSecurityOptionsJsonSerializerTest {
         TransportSecurityOptions options = new TransportSecurityOptions.Builder()
                 .withCertificates(Paths.get("certs.pem"), Paths.get("myhost.key"))
                 .withCaCertificates(Paths.get("my_cas.pem"))
-                .withAcceptedCiphers(com.yahoo.vespa.jdk8compat.List.of("TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384" , "TLS_AES_256_GCM_SHA384"))
+                .withAcceptedCiphers(Arrays.asList("TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384" , "TLS_AES_256_GCM_SHA384"))
                 .withAcceptedProtocols(Collections.singletonList("TLSv1.2"))
                 .withHostnameValidationDisabled(true)
                 .build();