Bump to 2.9.0rc4, and demonstrate using resources. (#3)

Author: stuhood

pants.toml

@@ -2,7 +2,7 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 [GLOBAL]
-pants_version = "2.9.0rc2"
+pants_version = "2.9.0rc5"
 backend_packages = [
   # This repository demonstrates a mix of Java and Scala, and so both backends are enabled. But each
   # backend can be used independently, so there is no need to expose Scala BUILD file
@@ -16,6 +16,14 @@ backend_packages = [
   "pants.backend.experimental.scala.lint.scalafmt",
 ]
 
+[source]
+# Pants supports many layouts of sources: from Maven/SBT style project-centric layouts, to
+# monorepo layouts. In this case, we have a monorepo layout, with all sources under a `src`
+# directory, organized by type.
+#
+# See https://www.pantsbuild.org/docs/source-roots for more information.
+root_patterns = ["/src/*"]
+
 [javac]
 args = [
   "-deprecation",

src/jvm/org/pantsbuild/example/lib/BUILD

@@ -1 +1,7 @@
-java_sources()
+java_sources(
+    dependencies=[
+        # Resource dependencies cannot be inferred, so we must explicitly declare that we
+        # depend on them.
+        "src/resources/org/pantsbuild/example/lib",
+    ],
+)

src/jvm/org/pantsbuild/example/lib/ExampleLib.java

@@ -1,9 +1,15 @@
 package org.pantsbuild.example.lib;
 
+import com.google.common.base.Charsets;
 import com.google.common.base.Joiner;
+import com.google.common.io.Resources;
+import java.io.IOException;
 
 public class ExampleLib {
-  public static String hello() {
-    return Joiner.on(" ").join("Hello", "World!");
+  public static String hello() throws IOException {
+    String world =
+        Resources.toString(Resources.getResource(ExampleLib.class, "world.txt"), Charsets.UTF_8)
+            .strip();
+    return Joiner.on(" ").join("Hello", world);
   }
 }

src/resources/org/pantsbuild/example/lib/BUILD

@@ -0,0 +1 @@
+resources(sources=["*.txt"])

src/resources/org/pantsbuild/example/lib/world.txt

@@ -0,0 +1 @@
+World!