Introduce JavaUtilLoggingConfigurer to configure JUL for tests

spring-webflux/src/test/java/org/springframework/test_fixtures/logging/JavaUtilLoggingConfigurer.java

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+/*
+ * Copyright 2002-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.test_fixtures.logging;
+
+import java.io.InputStream;
+import java.util.logging.LogManager;
+
+import org.junit.platform.launcher.TestExecutionListener;
+import org.junit.platform.launcher.TestPlan;
+
+/**
+ * JUnit Platform {@link TestExecutionListener} that configures Java Util Logging
+ * (JUL) from a file named {@code jul-test.properties} in the root of the classpath.
+ *
+ * <p>This allows for projects to configure JUL for a test suite, analogous to
+ * log4j's support via {@code log4j2-test.xml}.
+ *
+ * <p>This listener can be automatically registered on the JUnit Platform by
+ * adding the fully qualified name of this class to a file named
+ * {@code /META-INF/services/org.junit.platform.launcher.TestExecutionListener}
+ * &mdash; for example, under {@code src/test/resources}.
+ *
+ * @author Sam Brannen
+ * @since 5.2.2
+ */
+public class JavaUtilLoggingConfigurer implements TestExecutionListener {
+
+	public static final String JUL_TEST_PROPERTIES_FILE = "jul-test.properties";
+
+
+	@Override
+	public void testPlanExecutionStarted(TestPlan testPlan) {
+		try (InputStream inputStream = getClass().getClassLoader().getResourceAsStream(JUL_TEST_PROPERTIES_FILE)) {
+			LogManager.getLogManager().readConfiguration(inputStream);
+		}
+		catch (Exception ex) {
+			System.err.println("WARNING: failed to configure Java Util Logging from classpath resource " +
+					JUL_TEST_PROPERTIES_FILE);
+			System.err.println(ex);
+		}
+	}
+}

spring-webflux/src/test/resources/META-INF/services/org.junit.platform.launcher.TestExecutionListener

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+org.springframework.test_fixtures.logging.JavaUtilLoggingConfigurer

spring-webflux/src/test/resources/jul-test.properties

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+# Console Logging
+java.util.logging.ConsoleHandler.level = WARNING