---
title: Recipes
description: A collection of common/useful code examples for Kotlin and Java
---


# Recipes

We've written some recipes that demonstrate how to solve common problems with OkHttp. Read through them to learn about how everything works together. Cut-and-paste these examples freely; that's what they're for.

### Synchronous Get ([.kt][SynchronousGetKotlin], [.java][SynchronousGetJava])

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.core.exception;

import static org.codelibs.core.collection.ArrayUtil.asArray;

import java.lang.reflect.Field;

/**
 * Exception thrown when a {@link Field} cannot be found.
 *
 * @author higa
 *
 */

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.core.exception;

import static org.codelibs.core.collection.ArrayUtil.asArray;

import java.sql.SQLException;

import org.codelibs.core.message.MessageFormatter;

/**
 * Exception that wraps {@link SQLException}.
 *
 * @author higa
 * @author manhole
 */

 * 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.codelibs.core.collection;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.not;
import static org.junit.Assert.assertThat;

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.core.exception;

import static org.codelibs.core.collection.ArrayUtil.asArray;

import java.lang.reflect.Constructor;

import org.codelibs.core.lang.MethodUtil;

/**
 * Exception that wraps a {@link NoSuchMethodException} thrown when a {@link Constructor} cannot be found.

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.core.lang;

import static org.codelibs.core.collection.CollectionsUtil.newHashMap;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.lang.annotation.Annotation;
import java.util.Map;

import org.codelibs.core.beans.BeanDesc;

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.core.exception;

import static org.codelibs.core.collection.ArrayUtil.asArray;

import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

/**
 * Exception that wraps {@link SAXException}.
 *
 * @author higa
 */

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Collection;
import java.util.Map;

import org.codelibs.core.beans.BeanDesc;
import org.codelibs.core.beans.ParameterizedClassDesc;
import org.codelibs.core.beans.PropertyDesc;

 * 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.codelibs.core.collection;

import java.util.Map;

/**
 * {@link ArrayMap} that is case-insensitive for keys.
 *
 * @author higa
 * @param <V> the type of values
 */

                                fields.add(new ListField(currentField));
                            } else if (Collection.class.isAssignableFrom(type)) {
                                throw new RuntimeException("We dont interpolate into collections, use a list instead");
                            } else if (Map.class.isAssignableFrom(type)) {