Copy Java native dependencies directly into classpath (#9787)

Eliminates the intermediate copy of the native libraries for the Java bindings into target/native-deps, instead copying libcudf.so and libcudfjni.so directly into the classpath resources.  This eliminates the need to search target/native-deps at runtime when the native libraries are not in the classpath in the case of running tests before the jar is built.

Authors:
  - Jason Lowe (https://github.com/jlowe)

Approvers:
  - Robert (Bobby) Evans (https://github.com/revans2)

URL: #9787

java/pom.xml

@@ -297,9 +297,6 @@
                 <include>LICENSE</include>
               </includes>
             </resource>
-            <resource>
-                <directory>${project.build.directory}/native-deps/</directory>
-            </resource>
         </resources>
         <pluginManagement>
             <plugins>
@@ -499,14 +496,14 @@
                 <executions>
                     <execution>
                         <id>copy-native-libs</id>
-                        <phase>validate</phase>
+                        <phase>generate-resources</phase>
                         <goals>
                             <goal>copy-resources</goal>
                         </goals>
                         <configuration>
                             <overwrite>true</overwrite>
                             <skip>${skipNativeCopy}</skip>
-                            <outputDirectory>${project.build.directory}/native-deps/${os.arch}/${os.name}</outputDirectory>
+                            <outputDirectory>${project.build.outputDirectory}/${os.arch}/${os.name}</outputDirectory>
                             <resources>
                                 <resource>
                                     <directory>${native.build.path}</directory>

java/src/main/java/ai/rapids/cudf/NativeDepsLoader.java

@@ -81,9 +81,7 @@ public static synchronized void loadNativeDeps() {
 
   /**
    * Allows other libraries to reuse the same native deps loading logic. Libraries will be searched
-   * for under ${os.arch}/${os.name}/ in the class path using the class loader for this class. It
-   * will also look for the libraries under ./target/native-deps/${os.arch}/${os.name} to help
-   * facilitate testing while building.
+   * for under ${os.arch}/${os.name}/ in the class path using the class loader for this class.
    * <br/>
    * Because this just loads the libraries and loading the libraries themselves needs to be a
    * singleton operation it is recommended that any library using this provide their own wrapper
@@ -203,12 +201,7 @@ private static File createFile(String os, String arch, String baseName) throws I
     File loc;
     URL resource = loader.getResource(path);
     if (resource == null) {
-      // It looks like we are not running from the jar, or there are issues with the jar
-      File f = new File("./target/native-deps/" + path);
-      if (!f.exists()) {
-        throw new FileNotFoundException("Could not locate native dependency " + path);
-      }
-      resource = f.toURI().toURL();
+      throw new FileNotFoundException("Could not locate native dependency " + path);
     }
     try (InputStream in = resource.openStream()) {
       loc = File.createTempFile(baseName, ".so");