Polishing

spring-context/src/test/java/org/springframework/scheduling/annotation/EnableAsyncTests.java

@@ -217,7 +217,7 @@ public class EnableAsyncTests {
 	}
 
 	@Test
-	public void customExecutorConfig() throws InterruptedException {
+	public void customExecutorConfig() {
 		// Arrange
 		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
 		ctx.register(CustomExecutorConfig.class);

spring-context/src/test/java/org/springframework/tests/mock/jndi/ExpectedLookupTemplate.java

@@ -23,28 +23,29 @@ import javax.naming.NamingException;
 import org.springframework.jndi.JndiTemplate;
 
 /**
- * Simple extension of the JndiTemplate class that always returns
- * a given object. Very useful for testing. Effectively a mock object.
+ * Simple extension of the JndiTemplate class that always returns a given object.
+ *
+ * <p>Very useful for testing. Effectively a mock object.
  *
  * @author Rod Johnson
  * @author Juergen Hoeller
  */
 public class ExpectedLookupTemplate extends JndiTemplate {
 
-	private final Map<String, Object> jndiObjects = new ConcurrentHashMap<>();
+	private final Map<String, Object> jndiObjects = new ConcurrentHashMap<>(16);
 
 
 	/**
-	 * Construct a new JndiTemplate that will always return given objects
-	 * for given names. To be populated through {@code addObject} calls.
+	 * Construct a new JndiTemplate that will always return given objects for
+	 * given names. To be populated through {@code addObject} calls.
 	 * @see #addObject(String, Object)
 	 */
 	public ExpectedLookupTemplate() {
 	}
 
 	/**
-	 * Construct a new JndiTemplate that will always return the
-	 * given object, but honour only requests for the given name.
+	 * Construct a new JndiTemplate that will always return the given object,
+	 * but honour only requests for the given name.
 	 * @param name the name the client is expected to look up
 	 * @param object the object that will be returned
 	 */
@@ -52,10 +53,8 @@ public class ExpectedLookupTemplate extends JndiTemplate {
 		addObject(name, object);
 	}
 
-
 	/**
-	 * Add the given object to the list of JNDI objects that this
-	 * template will expose.
+	 * Add the given object to the list of JNDI objects that this template will expose.
 	 * @param name the name the client is expected to look up
 	 * @param object the object that will be returned
 	 */
@@ -63,11 +62,10 @@ public class ExpectedLookupTemplate extends JndiTemplate {
 		this.jndiObjects.put(name, object);
 	}
 
-
 	/**
-	 * If the name is the expected name specified in the constructor,
-	 * return the object provided in the constructor. If the name is
-	 * unexpected, a respective NamingException gets thrown.
+	 * If the name is the expected name specified in the constructor, return the
+	 * object provided in the constructor. If the name is unexpected, a
+	 * respective NamingException gets thrown.
 	 */
 	@Override
 	public Object lookup(String name) throws NamingException {

spring-context/src/test/java/org/springframework/tests/mock/jndi/SimpleNamingContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -33,6 +33,7 @@ import javax.naming.OperationNotSupportedException;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.lang.Nullable;
 import org.springframework.util.StringUtils;
 
 /**
@@ -80,7 +81,9 @@ public class SimpleNamingContext implements Context {
 	 * Create a new naming context with the given naming root,
 	 * the given name/object map, and the JNDI environment entries.
 	 */
-	public SimpleNamingContext(String root, Hashtable<String, Object> boundObjects, Hashtable<String, Object> env) {
+	public SimpleNamingContext(
+			String root, Hashtable<String, Object> boundObjects, @Nullable Hashtable<String, Object> env) {
+
 		this.root = root;
 		this.boundObjects = boundObjects;
 		if (env != null) {
@@ -206,6 +209,7 @@ public class SimpleNamingContext implements Context {
 	}
 
 	@Override
+	@Nullable
 	public Object addToEnvironment(String propName, Object propVal) {
 		return this.environment.put(propName, propVal);
 	}
@@ -293,7 +297,7 @@ public class SimpleNamingContext implements Context {
 	}
 
 
-	private static abstract class AbstractNamingEnumeration<T> implements NamingEnumeration<T> {
+	private abstract static class AbstractNamingEnumeration<T> implements NamingEnumeration<T> {
 
 		private Iterator<T> iterator;
 
@@ -353,7 +357,7 @@ public class SimpleNamingContext implements Context {
 	}
 
 
-	private static class NameClassPairEnumeration extends AbstractNamingEnumeration<NameClassPair> {
+	private static final class NameClassPairEnumeration extends AbstractNamingEnumeration<NameClassPair> {
 
 		private NameClassPairEnumeration(SimpleNamingContext context, String root) throws NamingException {
 			super(context, root);
@@ -366,7 +370,7 @@ public class SimpleNamingContext implements Context {
 	}
 
 
-	private static class BindingEnumeration extends AbstractNamingEnumeration<Binding> {
+	private static final class BindingEnumeration extends AbstractNamingEnumeration<Binding> {
 
 		private BindingEnumeration(SimpleNamingContext context, String root) throws NamingException {
 			super(context, root);

spring-context/src/test/java/org/springframework/tests/mock/jndi/SimpleNamingContextBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -26,7 +26,10 @@ import javax.naming.spi.NamingManager;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.lang.Nullable;
+import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
 
 /**
  * Simple implementation of a JNDI naming context builder.
@@ -42,7 +45,7 @@ import org.springframework.util.ClassUtils;
  * <ul>
  * <li>{@code SingleConnectionDataSource} (using the same Connection for all getConnection calls)
  * <li>{@code DriverManagerDataSource} (creating a new Connection on each getConnection call)
- * <li>Apache's Jakarta Commons DBCP offers {@code org.apache.commons.dbcp.BasicDataSource} (a real pool)
+ * <li>Apache's Commons DBCP offers {@code org.apache.commons.dbcp.BasicDataSource} (a real pool)
  * </ul>
  *
  * <p>Typical usage in bootstrap code:
@@ -80,7 +83,8 @@ import org.springframework.util.ClassUtils;
  */
 public class SimpleNamingContextBuilder implements InitialContextFactoryBuilder {
 
-	/** An instance of this class bound to JNDI */
+	/** An instance of this class bound to JNDI. */
+	@Nullable
 	private static volatile SimpleNamingContextBuilder activated;
 
 	private static boolean initialized = false;
@@ -93,13 +97,14 @@ public class SimpleNamingContextBuilder implements InitialContextFactoryBuilder
 	 * @return the current SimpleNamingContextBuilder instance,
 	 * or {@code null} if none
 	 */
+	@Nullable
 	public static SimpleNamingContextBuilder getCurrentContextBuilder() {
 		return activated;
 	}
 
 	/**
 	 * If no SimpleNamingContextBuilder is already configuring JNDI,
-	 * create and activate one. Otherwise take the existing activate
+	 * create and activate one. Otherwise take the existing activated
 	 * SimpleNamingContextBuilder, clear it and return it.
 	 * <p>This is mainly intended for test suites that want to
 	 * reinitialize JNDI bindings from scratch repeatedly.
@@ -107,17 +112,18 @@ public class SimpleNamingContextBuilder implements InitialContextFactoryBuilder
 	 * to control JNDI bindings
 	 */
 	public static SimpleNamingContextBuilder emptyActivatedContextBuilder() throws NamingException {
-		if (activated != null) {
+		SimpleNamingContextBuilder builder = activated;
+		if (builder != null) {
 			// Clear already activated context builder.
-			activated.clear();
+			builder.clear();
 		}
 		else {
 			// Create and activate new context builder.
-			SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder();
+			builder = new SimpleNamingContextBuilder();
 			// The activate() call will cause an assignment to the activated variable.
 			builder.activate();
 		}
-		return activated;
+		return builder;
 	}
 
 
@@ -138,12 +144,10 @@ public class SimpleNamingContextBuilder implements InitialContextFactoryBuilder
 		logger.info("Activating simple JNDI environment");
 		synchronized (initializationLock) {
 			if (!initialized) {
-				if (NamingManager.hasInitialContextFactoryBuilder()) {
-					throw new IllegalStateException(
+				Assert.state(!NamingManager.hasInitialContextFactoryBuilder(),
 							"Cannot activate SimpleNamingContextBuilder: there is already a JNDI provider registered. " +
 							"Note that JNDI is a JVM-wide service, shared at the JVM system class loader level, " +
 							"with no reset option. As a consequence, a JNDI provider must only be registered once per JVM.");
-				}
 				NamingManager.setInitialContextFactoryBuilder(this);
 				initialized = true;
 			}
@@ -192,7 +196,8 @@ public class SimpleNamingContextBuilder implements InitialContextFactoryBuilder
 	 * @see SimpleNamingContext
 	 */
 	@Override
-	public InitialContextFactory createInitialContextFactory(Hashtable<?,?> environment) {
+	@SuppressWarnings("unchecked")
+	public InitialContextFactory createInitialContextFactory(@Nullable Hashtable<?,?> environment) {
 		if (activated == null && environment != null) {
 			Object icf = environment.get(Context.INITIAL_CONTEXT_FACTORY);
 			if (icf != null) {
@@ -212,22 +217,16 @@ public class SimpleNamingContextBuilder implements InitialContextFactoryBuilder
 							"Specified class does not implement [" + InitialContextFactory.class.getName() + "]: " + icf);
 				}
 				try {
-					return (InitialContextFactory) icfClass.newInstance();
+					return (InitialContextFactory) ReflectionUtils.accessibleConstructor(icfClass).newInstance();
 				}
 				catch (Throwable ex) {
-					throw new IllegalStateException("Cannot instantiate specified InitialContextFactory: " + icf, ex);
+					throw new IllegalStateException("Unable to instantiate specified InitialContextFactory: " + icf, ex);
 				}
 			}
 		}
 
 		// Default case...
-		return new InitialContextFactory() {
-			@Override
-			@SuppressWarnings("unchecked")
-			public Context getInitialContext(Hashtable<?,?> environment) {
-				return new SimpleNamingContext("", boundObjects, (Hashtable<String, Object>) environment);
-			}
-		};
+		return env -> new SimpleNamingContext("", this.boundObjects, (Hashtable<String, Object>) env);
 	}
 
 }

spring-core/src/main/java/org/springframework/util/ObjectUtils.java

@@ -199,7 +199,7 @@ public abstract class ObjectUtils {
 	/**
 	 * Check whether the given array of enum constants contains a constant with the given name,
 	 * ignoring case when determining a match.
-	 * @param enumValues the enum values to check, typically the product of a call to MyEnum.values()
+	 * @param enumValues the enum values to check, typically obtained via {@code MyEnum.values()}
 	 * @param constant the constant name to find (must not be null or empty string)
 	 * @return whether the constant has been found in the given array
 	 */
@@ -209,15 +209,14 @@ public abstract class ObjectUtils {
 
 	/**
 	 * Check whether the given array of enum constants contains a constant with the given name.
-	 * @param enumValues the enum values to check, typically the product of a call to MyEnum.values()
+	 * @param enumValues the enum values to check, typically obtained via {@code MyEnum.values()}
 	 * @param constant the constant name to find (must not be null or empty string)
 	 * @param caseSensitive whether case is significant in determining a match
 	 * @return whether the constant has been found in the given array
 	 */
 	public static boolean containsConstant(Enum<?>[] enumValues, String constant, boolean caseSensitive) {
 		for (Enum<?> candidate : enumValues) {
-			if (caseSensitive ?
-					candidate.toString().equals(constant) :
+			if (caseSensitive ? candidate.toString().equals(constant) :
 					candidate.toString().equalsIgnoreCase(constant)) {
 				return true;
 			}
@@ -228,7 +227,7 @@ public abstract class ObjectUtils {
 	/**
 	 * Case insensitive alternative to {@link Enum#valueOf(Class, String)}.
 	 * @param <E> the concrete Enum type
-	 * @param enumValues the array of all Enum constants in question, usually per Enum.values()
+	 * @param enumValues the array of all Enum constants in question, usually per {@code Enum.values()}
 	 * @param constant the constant to get the enum value of
 	 * @throws IllegalArgumentException if the given constant is not found in the given array
 	 * of enum values. Use {@link #containsConstant(Enum[], String)} as a guard to avoid this exception.
@@ -239,9 +238,8 @@ public abstract class ObjectUtils {
 				return candidate;
 			}
 		}
-		throw new IllegalArgumentException(
-				String.format("constant [%s] does not exist in enum type %s",
-						constant, enumValues.getClass().getComponentType().getName()));
+		throw new IllegalArgumentException("Constant [" + constant + "] does not exist in enum type " +
+				enumValues.getClass().getComponentType().getName());
 	}
 
 	/**

spring-core/src/test/java/org/springframework/util/FastByteArrayOutputStreamTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -20,30 +20,24 @@ import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 
-import org.junit.Before;
 import org.junit.Test;
 
 import static org.junit.Assert.*;
 
 /**
- * Test suite for {@link FastByteArrayOutputStream}
+ * Test suite for {@link FastByteArrayOutputStream}.
+ *
  * @author Craig Andrews
  */
 public class FastByteArrayOutputStreamTests {
 
 	private static final int INITIAL_CAPACITY = 256;
 
-	private FastByteArrayOutputStream os;
-
-	private byte[] helloBytes;
+	private final FastByteArrayOutputStream os = new FastByteArrayOutputStream(INITIAL_CAPACITY);;
 
-
-	@Before
-	public void setUp() throws Exception {
-		this.os = new FastByteArrayOutputStream(INITIAL_CAPACITY);
-		this.helloBytes = "Hello World".getBytes("UTF-8");
-	}
+	private final byte[] helloBytes = "Hello World".getBytes(StandardCharsets.UTF_8);;
 
 
 	@Test

spring-core/src/test/java/org/springframework/util/ObjectUtilsTests.java

@@ -45,6 +45,7 @@ public class ObjectUtilsTests {
 	@Rule
 	public final ExpectedException exception = ExpectedException.none();
 
+
 	@Test
 	public void isCheckedException() {
 		assertTrue(ObjectUtils.isCheckedException(new Exception()));
@@ -807,7 +808,8 @@ public class ObjectUtilsTests {
 		assertThat(ObjectUtils.caseInsensitiveValueOf(Tropes.values(), "BAR"), is(Tropes.BAR));
 
 		exception.expect(IllegalArgumentException.class);
-		exception.expectMessage(is("constant [bogus] does not exist in enum type org.springframework.util.ObjectUtilsTests$Tropes"));
+		exception.expectMessage(
+				is("Constant [bogus] does not exist in enum type org.springframework.util.ObjectUtilsTests$Tropes"));
 		ObjectUtils.caseInsensitiveValueOf(Tropes.values(), "bogus");
 	}
 
@@ -818,6 +820,6 @@ public class ObjectUtilsTests {
 	}
 
 
-	enum Tropes { FOO, BAR, baz }
+	enum Tropes {FOO, BAR, baz}
 
 }

spring-test/src/main/java/org/springframework/mock/jndi/SimpleNamingContextBuilder.java

@@ -104,7 +104,7 @@ public class SimpleNamingContextBuilder implements InitialContextFactoryBuilder
 
 	/**
 	 * If no SimpleNamingContextBuilder is already configuring JNDI,
-	 * create and activate one. Otherwise take the existing activate
+	 * create and activate one. Otherwise take the existing activated
 	 * SimpleNamingContextBuilder, clear it and return it.
 	 * <p>This is mainly intended for test suites that want to
 	 * reinitialize JNDI bindings from scratch repeatedly.
@@ -226,7 +226,7 @@ public class SimpleNamingContextBuilder implements InitialContextFactoryBuilder
 		}
 
 		// Default case...
-		return environment1 -> new SimpleNamingContext("", this.boundObjects, (Hashtable<String, Object>) environment1);
+		return env -> new SimpleNamingContext("", this.boundObjects, (Hashtable<String, Object>) env);
 	}
 
 }