Fix ConditionalOnJndi evaluation

Enable ConditionalOnJndi evaluation and add tests that validate it works
as expected

Fixes gh-1820

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionalOnJndi.java

@@ -16,6 +16,11 @@
 
 package org.springframework.boot.autoconfigure.condition;
 
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
 import javax.naming.InitialContext;
 
 import org.springframework.context.annotation.Conditional;
@@ -27,6 +32,9 @@ import org.springframework.context.annotation.Conditional;
  * @author Phillip Webb
  * @since 1.2.0
  */
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
 @Conditional(OnJndiCondition.class)
 public @interface ConditionalOnJndi {
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnJndiTests.java

@@ -0,0 +1,202 @@
+/*
+ * Copyright 2012-2014 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
+ *
+ *      http://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.boot.autoconfigure.condition;
+
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.Map;
+import javax.naming.Context;
+import javax.naming.InitialContext;
+import javax.naming.NamingException;
+import javax.naming.spi.InitialContextFactory;
+
+import org.hamcrest.Matcher;
+import org.junit.After;
+import org.junit.Test;
+
+import org.springframework.boot.test.EnvironmentTestUtils;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.iterableWithSize;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests for {@link ConditionalOnJndi}
+ *
+ * @author Stephane Nicoll
+ */
+public class ConditionalOnJndiTests {
+
+	private String initialContextFactory;
+
+	private ConfigurableApplicationContext context;
+
+	@After
+	public void close() {
+		TestableInitialContextFactory.clearAll();
+		if (this.initialContextFactory != null) {
+			System.setProperty(Context.INITIAL_CONTEXT_FACTORY, this.initialContextFactory);
+		}
+		else {
+			System.clearProperty(Context.INITIAL_CONTEXT_FACTORY);
+		}
+		if (this.context != null) {
+			this.context.close();
+		}
+	}
+
+	@Test
+	public void jndiNotAvailable() {
+		load(JndiAvailableConfiguration.class);
+		assertPresent(false);
+	}
+
+	@Test
+	public void jndiAvailable() {
+		setupJndi();
+		load(JndiAvailableConfiguration.class);
+		assertPresent(true);
+	}
+
+	@Test
+	public void jndiLocationNotBound() {
+		setupJndi();
+		load(JndiConditionConfiguration.class);
+		assertPresent(false);
+	}
+
+	@Test
+	public void jndiLocationBound() {
+		setupJndi();
+		TestableInitialContextFactory.bind("java:/FooManager", new Object());
+		load(JndiConditionConfiguration.class);
+		assertPresent(true);
+	}
+
+	private void setupJndi() {
+		this.initialContextFactory = System.getProperty(Context.INITIAL_CONTEXT_FACTORY);
+		System.setProperty(Context.INITIAL_CONTEXT_FACTORY,
+				TestableInitialContextFactory.class.getName());
+	}
+
+
+	private void assertPresent(boolean expected) {
+		int expectedNumber = expected ? 1 : 0;
+		Matcher<Iterable<String>> matcher = iterableWithSize(expectedNumber);
+		assertThat(this.context.getBeansOfType(String.class).values(), is(matcher));
+	}
+
+	private void load(Class<?> config, String... environment) {
+		AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext();
+		EnvironmentTestUtils.addEnvironment(applicationContext, environment);
+		applicationContext.register(config);
+		applicationContext.register(JndiConditionConfiguration.class);
+		applicationContext.refresh();
+		this.context = applicationContext;
+	}
+
+	@Configuration
+	@ConditionalOnJndi
+	static class JndiAvailableConfiguration {
+
+		@Bean
+		public String foo() {
+			return "foo";
+		}
+	}
+
+	@Configuration
+	@ConditionalOnJndi("java:/FooManager")
+	static class JndiConditionConfiguration {
+
+		@Bean
+		public String foo() {
+			return "foo";
+		}
+	}
+
+
+	public static class TestableInitialContextFactory implements InitialContextFactory {
+
+		private static TestableContext context;
+
+		public Context getInitialContext(Hashtable<?, ?> environment)
+				throws NamingException {
+			return getContext();
+		}
+
+		public static void bind(String name, Object obj) {
+			try {
+				getContext().bind(name, obj);
+			}
+			catch (NamingException o_O) {
+				throw new IllegalStateException(o_O);
+			}
+		}
+
+		public static void clearAll() {
+			getContext().clearAll();
+		}
+
+		private static TestableContext getContext() {
+			if (context == null) {
+				try {
+					context = new TestableContext();
+				}
+				catch (NamingException o_O) {
+					throw new IllegalStateException(o_O);
+				}
+			}
+			return context;
+		}
+
+
+		private static class TestableContext extends InitialContext {
+
+			private final Map<String, Object> bindings = new HashMap<String, Object>();
+
+			private TestableContext() throws NamingException {
+				super(true);
+			}
+
+			@Override
+			public void bind(String name, Object obj)
+					throws NamingException {
+				this.bindings.put(name, obj);
+			}
+
+			@Override
+			public Object lookup(String name) throws NamingException {
+				return this.bindings.get(name);
+			}
+
+			@Override
+			public Hashtable<?, ?> getEnvironment() throws NamingException {
+				return new Hashtable<Object, Object>(); // Used to detect if JNDI is available
+			}
+
+			public void clearAll() {
+				this.bindings.clear();
+			}
+		}
+	}
+
+}