Update Java build with:

* An initial README.md file

* Copy of license files and libraries for GFortran

* Support for MXNET_LIBRARY_PATH

java/README.md

@@ -0,0 +1,32 @@
+<!--- Licensed to the Apache Software Foundation (ASF) under one -->
+<!--- or more contributor license agreements.  See the NOTICE file -->
+<!--- distributed with this work for additional information -->
+<!--- regarding copyright ownership.  The ASF licenses this file -->
+<!--- to you under the Apache License, Version 2.0 (the -->
+<!--- "License"); you may not use this file except in compliance -->
+<!--- with the License.  You may obtain a copy of the License at -->
+
+<!---   http://www.apache.org/licenses/LICENSE-2.0 -->
+
+<!--- Unless required by applicable law or agreed to in writing, -->
+<!--- software distributed under the License is distributed on an -->
+<!--- "AS IS" BASIS, 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. -->
+
+MXNet Java Package
+====================
+This directory and nested files contain MXNet Java package and language binding.
+
+## Installation
+To install requirements for MXNet Java package, visit MXNet [Install Instruction](https://mxnet.apache.org/get_started)
+
+## Running the unit tests
+For running unit tests, you will need the [Gradle build system](https://gradle.org/). To install:
+ * https://gradle.org/install/
+
+Once ```gradle``` is installed, run the following from MXNet java subdirectory (please make sure the installation path of ```gradle``` is included in your ```$PATH``` environment variable):
+```
+gradle clean build test -Dorg.gradle.jvmargs=-Xmx2048m
+```

java/build.gradle

@@ -55,7 +55,18 @@ javacppBuildCompiler {
     copyLibs = true
 }
 
+task copyLicenses(type: Copy) {
+    from(["$projectDir/..", "$projectDir/../tools/dependencies/"]) {
+        include 'DISCLAIMER-WIP'
+        include 'LICENSE'
+        include 'NOTICE'
+        include 'LICENSE.binary.dependencies'
+    }
+    into "$buildDir/resources/main/META-INF"
+}
+
 jar {
+    dependsOn copyLicenses
     manifest {
         attributes 'Class-Path': configurations.runtimeClasspath.collect { it.getName() }.join(' ')
     }

java/build.sh

@@ -1,11 +1,19 @@
 #!/bin/bash
 set -e
 
+if [[ -n "$MXNET_LIBRARY_PATH" ]]; then
+    echo Found MXNET_LIBRARY_PATH=$MXNET_LIBRARY_PATH
+    mkdir -p build/$PLATFORM$PLATFORM_EXTENSION/lib
+    cp -RLf ../include build/$PLATFORM$PLATFORM_EXTENSION/include
+    cp $MXNET_LIBRARY_PATH build/$PLATFORM$PLATFORM_EXTENSION/lib
+    exit 0
+fi
+
 mkdir -p build/$PLATFORM$PLATFORM_EXTENSION/cmake
 pushd build/$PLATFORM$PLATFORM_EXTENSION/cmake
 
 if [[ -d "C:/msys64" ]] && [[ -z ${OpenBLAS_home:-} ]]; then
-    export OpenBLAS_HOME=C:/msys64/mingw64/include/OpenBlas/
+    export OpenBLAS_HOME=C:/msys64/mingw64/include/OpenBLAS/
     export OpenBLAS=C:/msys64/mingw64/lib/
 fi
 

java/src/main/java/org/apache/mxnet/internal/c_api/mxnet.java

@@ -35,11 +35,16 @@
             define = {"DMLC_USE_CXX11 1", "MSHADOW_USE_CBLAS 1", "MSHADOW_IN_CXX11 1", "MSHADOW_USE_CUDA 0", "MSHADOW_USE_F16C 0", "MXNET_USE_TVM_OP 0"},
             include = {"dlpack/dlpack.h", "mxnet/c_api.h", "mxnet/runtime/c_runtime_api.h", "nnvm/c_api.h"},
             link = "mxnet",
-            linkpath = "/usr/local/lib/"
+            linkpath = {"/usr/lib64/", "/usr/lib/", "/usr/local/lib/"},
+            preload = {"[email protected]", "[email protected]", "[email protected]"},
+            preloadpath = {"/usr/local/lib/gcc/10/", "/usr/local/lib/gcc/9/", "/usr/local/lib/gcc/8/",
+                           "/usr/local/lib/gcc/7/", "/usr/local/lib/gcc/6/", "/usr/local/lib/gcc/5/"}
         ),
         @Platform(
             value = "windows",
-            link = "libmxnet"
+            link = "libmxnet",
+            preload = {"libwinpthread-1", "libgcc_s_seh-1", "libgfortran-5", "libgfortran-4", "libgfortran-3", "libopenblas"},
+            preloadpath = "C:/msys64/mingw64/bin/"
         )
     },
     target = "org.apache.mxnet.internal.c_api",