undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/lang/LazyConstant/DemoContainerInjectionTest.java

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test
+ * @summary Basic tests for dependency injection
+ * @enablePreview
+ * @run junit DemoContainerInjectionTest
+ */
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+final class DemoContainerInjectionTest {
+
+    interface Foo{}
+    interface Bar{};
+    static class FooImpl implements Foo{};
+    static class BarImpl implements Bar{};
+
+    // Provides a type safe way of associating a type to a supplier
+    record Provider<T>(Class<T> type, Supplier<? extends T> supplier){}
+
+    @Test
+    void ComputedComponentsViaLambda() {
+        Container container = ComputedContainer.of(Set.of(Foo.class, Bar.class), t -> switch (t) {
+            case Class<?> c when c.equals(Foo.class) -> new FooImpl();
+            case Class<?> c when c.equals(Bar.class) -> new BarImpl();
+            default -> throw new IllegalArgumentException();
+        });
+        assertContainerPopulated(container);
+    }
+
+    @Test
+    void SettableComponents() {
+        SettableContainer container = SettableScratchContainer.of(Set.of(Foo.class, Bar.class));
+        container.set(Foo.class, new FooImpl());
+        container.set(Bar.class, new BarImpl());
+        assertContainerPopulated(container);
+    }
+
+
+    @Test
+    void ProviderComponents() {
+        Container container = ProviderContainer.of(Map.of(
+                Foo.class, FooImpl::new,
+                Bar.class, BarImpl::new));
+        assertContainerPopulated(container);
+    }
+
+    @Test
+    void ProviderTypedComponents() {
+        Container container = providerTypedContainer(Set.of(
+           new Provider<>(Foo.class, FooImpl::new),
+           new Provider<>(Bar.class, BarImpl::new)
+        ));
+        assertContainerPopulated(container);
+    }
+
+    private static void assertContainerPopulated(Container container) {
+        assertInstanceOf(FooImpl.class, container.get(Foo.class));
+        assertInstanceOf(BarImpl.class, container.get(Bar.class));
+    }
+
+    interface Container {
+        <T> T get(Class<T> type);
+    }
+
+    interface SettableContainer extends Container {
+        <T> void set(Class<T> type, T implementation);
+    }
+
+    record ComputedContainer(Map<Class<?>, ?> components) implements Container {
+
+        @Override
+        public <T> T get(Class<T> type) {
+            return type.cast(components.get(type));
+        }
+
+        static Container of(Set<Class<?>> components, Function<Class<?>, ?> mapper) {
+            return new ComputedContainer(Map.ofLazy(components, mapper));
+        }
+
+    }
+
+    record SettableScratchContainer(Map<Class<?>, Object> scratch, Map<Class<?>, ?> components) implements SettableContainer {
+
+        @Override
+        public <T> void set(Class<T> type, T implementation) {
+            if (scratch.putIfAbsent(type, type.cast(implementation)) != null) {
+                throw new IllegalStateException("Can only set once for " + type);
+            }
+        }
+
+        @Override
+        public <T> T get(Class<T> type) {
+            return type.cast(components.get(type));
+        }
+
+        static SettableContainer of(Set<Class<?>> components) {
+            Map<Class<?>, Object> scratch = new ConcurrentHashMap<>();
+            return new SettableScratchContainer(scratch, Map.ofLazy(components, scratch::get));
+        }
+
+    }
+
+    record ProviderContainer(Map<Class<?>, ?> components) implements Container {
+
+        @Override
+        public <T> T get(Class<T> type) {
+            return type.cast(components.get(type));
+        }
+
+        static Container of(Map<Class<?>, Supplier<?>> components) {
+            var map = Map.ofLazy(components.keySet(), t -> components.get(t).get());
+            return new ProviderContainer(map);
+        }
+
+    }
+
+    static Container providerTypedContainer(Set<Provider<?>> providers) {
+                return ProviderContainer.of(providers.stream()
+                                .collect(Collectors.toMap(Provider::type, Provider::supplier)));
+    }
+
+}