Implement an example maven project (#15)

* Implement an example maven project

* Removed glob for srcs

CONTRIBUTORS

@@ -15,3 +15,4 @@ Han-Wen Nienhuys <hanwen@google.com>
 Christopher Parsons <cparsons@google.com>
 Michael Staib <mstaib@google.com>
 Manfred Touron <m@42.am>
+Jingwen Chen <jingwen@google.com>

java-maven/.gitignore

@@ -0,0 +1,5 @@
+bazel-bin
+bazel-genfiles
+bazel-java-maven
+bazel-out
+bazel-testlogs

java-maven/BUILD

@@ -0,0 +1,23 @@
+package(default_visibility = ["//visibility:public"])
+
+java_library(
+    name = "java-maven-lib",
+    srcs = glob(["src/main/java/com/example/myproject/*.java"]),
+    deps = ["@com_google_guava_guava//jar"],
+)
+
+java_binary(
+    name = "java-maven",
+    main_class = "com.example.myproject.App",
+    runtime_deps = [":java-maven-lib"],
+)
+
+java_test(
+    name = "tests",
+    srcs = glob(["src/test/java/com/example/myproject/*.java"]),
+    test_class = "com.example.myproject.TestApp",
+    deps = [
+        ":java-maven-lib",
+        "@com_google_guava_guava//jar",
+    ],
+)

java-maven/README.md

@@ -0,0 +1,24 @@
+Maven Java application
+----------------------
+
+This project demonstrates the usage of Bazel to retrieve dependencies from
+Maven repositories.
+
+To build this example, you will need to
+[install Bazel](http://bazel.io/docs/install.html).
+
+The Java application makes use of a library in [Guava](https://github.com/google/guava), which is downloaded from a remote repository using Maven.
+
+This application demonstrates the usage of rules `maven_jar` and `maven_server` to configure dependencies. The dependencies are configured in the `WORKSPACE` file.
+
+Build the application by running:
+
+```
+$ bazel build :java-maven
+```
+
+Test the application by running:
+
+```
+$ bazel test :tests
+```

java-maven/WORKSPACE

@@ -0,0 +1,10 @@
+maven_jar(
+    name = "com_google_guava_guava",
+    artifact = "com.google.guava:guava:18.0",
+    server = "maven_uk_server",
+)
+
+maven_server(
+    name = "maven_uk_server",
+    url = "http://uk.maven.org/maven2",
+)

java-maven/src/main/java/com/example/myproject/App.java

@@ -0,0 +1,20 @@
+package com.example.myproject;
+
+import com.google.common.primitives.Ints;
+
+/**
+ * This application compares two numbers, using the Ints.compare
+ * method from Guava.
+ */
+public class App {
+
+  public static int compare(int a, int b) {
+    return Ints.compare(a, b);
+  }
+
+  public static void main(String... args) throws Exception {
+    App app = new App();
+    System.out.println("Success: " + app.compare(2, 1));
+  }
+
+}

java-maven/src/test/java/com/example/myproject/TestApp.java

@@ -0,0 +1,17 @@
+package com.example.myproject;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Test;
+
+/**
+ * Tests for correct dependency retrieval with maven rules.
+ */
+public class TestApp {
+
+  @Test
+  public void testCompare() throws Exception {
+    App app = new App();
+    assertEquals("should return 0 when both numbers are equal", 0, app.compare(1, 1));
+  }
+
+}