I want to give you an idea of how bad things are with REST Api Client .
This is a Maven POM for Google APIs for java web project that uses Google APIs for Profile, Drive and Oauth2. Its insane:

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.google</groupId>
<artifactId>google</artifactId>
<version>5</version>
</parent>
<groupId>com.google.api.client</groupId>
<artifactId>google-plus-java-webapp-starter</artifactId>
<packaging>war</packaging>
<version>1.0.0</version>
<name>google-plus-java-webapp-starter</name>
<description>
Web application example for the Google+ platform using JSON and OAuth 2
</description>

<url>https://code.google.com/p/google-plus-java-starter</url>

<issueManagement>
<system>code.google.com</system>
<url>https://code.google.com/p/google-plus-java-starter/issues</url>
</issueManagement>

<inceptionYear>2011</inceptionYear>

<prerequisites>
<maven>2.0.9</maven>
</prerequisites>

<scm>
<connection>
scm:hg:https://hg.codespot.com/p/google-plus-java-starter/
</connection>
<developerConnection>
scm:hg:https://hg.codespot.com/p/google-plus-java-starter/
</developerConnection>
<url>
https://code.google.com/p/google-plus-java-starter/source/browse/
</url>
</scm>

<developers>
<developer>
<id>jennymurphy</id>
<name>Jennifer Murphy</name>
<organization>Google</organization>
<organizationUrl>http://www.google.com</organizationUrl>
<roles>
<role>owner</role>
<role>developer</role>
</roles>
<timezone>-8</timezone>
</developer>
</developers>

<repositories>
<!--
The repository for service specific Google client libraries. See
http://code.google.com/p/google-api-java-client/wiki/APIs#Maven_support
for more information
-->
<repository>
<id>google-api-services</id>
<url>http://mavenrepo.google-api-java-client.googlecode.com/hg</url>
</repository>
<repository>
<id>google-api-services-drive</id>
<url>http://google-api-client-libraries.appspot.com/mavenrepo</url>
</repository>
</repositories>

<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>maven-jetty-plugin</artifactId>
<configuration>
<contextPath>/</contextPath>
<systemProperties>
<systemProperty>
<name>configurationPath</name>
<value>./src/main/resources/config.properties</value>
</systemProperty>
</systemProperties>
</configuration>
</plugin>
</plugins>
<finalName>${project.artifactId}-${project.version}</finalName>
</build>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<netbeans.hint.deploy.server>gfv3ee6</netbeans.hint.deploy.server>
<project.http.version>1.13.1-beta</project.http.version>
<project.oauth.version>1.13.1-beta</project.oauth.version>
<webapi.version>6.0</webapi.version>
</properties>
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>13.0.1</version>
</dependency>

<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-drive</artifactId>
<version>v2-rev53-1.13.2-beta</version>
</dependency>
<dependency>
<!-- A generated library for Google+ APIs. Visit here for more info:
http://code.google.com/p/google-api-java-client/wiki/APIs#Google+_API
-->
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-plus</artifactId>
<version>v1-rev22-1.8.0-beta</version>
</dependency>

<dependency>
<groupId>com.google.api-client</groupId>
<artifactId>google-api-client</artifactId>
<version>1.13.2-beta</version>
</dependency>

<dependency>
<groupId>com.google.api-client</groupId>
<artifactId>google-api-client-servlet</artifactId>
<version>1.13.1-beta</version>
</dependency>

<dependency>

<!-- The Google OAuth Java client. Visit here for more info:
http://code.google.com/p/google-oauth-java-client/
-->

<groupId>com.google.oauth-client</groupId>
<artifactId>google-oauth-client</artifactId>
<version>1.13.1-beta</version>
</dependency>

<dependency>
<groupId>com.google.oauth-client</groupId>
<artifactId>google-oauth-client-servlet</artifactId>
<version>1.13.1-beta</version>
</dependency>

<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client-gson</artifactId>
<version>1.13.1-beta</version>
</dependency>

<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.1</version>
</dependency>

<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client</artifactId>
<version>1.13.1-beta</version>
</dependency>

<!-- Third party dependencies -->
<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client-jackson2</artifactId>
<version>1.13.1-beta</version>
</dependency>

<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>${webapi.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.0.1</version>
</dependency>

<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.0.3</version>
</dependency>

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.0.1</version>
</dependency>

<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.4</version>
</dependency>

<dependency>
<groupId>javax.jdo</groupId>
<artifactId>jdo2-api</artifactId>
<version>2.3-eb</version>
</dependency>

<dependency>
<groupId>com.google.code.findbugs</groupId>
<artifactId>jsr305</artifactId>
<version>1.3.9</version>
</dependency>

<dependency>
<groupId>com.google.protobuf</groupId>
<artifactId>protobuf-java</artifactId>
<version>2.2.0</version>
</dependency>

<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>

<dependency>
<groupId>xpp3</groupId>
<artifactId>xpp3</artifactId>
<version>1.1.4c</version>
</dependency>

</dependencies>

</project>