Fix the windows API missing issue and Linux shared library size issue for Java packaging.

cmake/ext_java.cmake

@@ -54,6 +54,9 @@ file(GLOB onnxruntime_extensions4j_native_src
     "${JAVA_ROOT}/src/main/native/*.h"
     "${PROJECT_SOURCE_DIR}/include/*.h"
     )
+if(WIN32)
+  list(APPEND onnxruntime_extensions4j_native_src "${JAVA_ROOT}/ortx_jni.def")
+endif()
 # Build the JNI library
 add_library(onnxruntime_extensions4j_jni SHARED ${onnxruntime_extensions4j_native_src})
 
@@ -70,6 +73,15 @@ else()
   target_link_libraries(onnxruntime_extensions4j_jni PRIVATE ortcustomops)
 endif()
 
+if(LINUX)
+  set_property(TARGET onnxruntime_extensions4j_jni APPEND_STRING PROPERTY LINK_FLAGS
+    " -Wl,--version-script -Wl,${JAVA_ROOT}/ortx_jni.ver")
+  # strip if not a debug build
+  if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
+    set_property(TARGET onnxruntime_extensions4j_jni APPEND_STRING PROPERTY LINK_FLAGS " -Wl,-s")
+  endif()
+endif()
+
 standardize_output_folder(onnxruntime_extensions4j_jni)
 
 # Set platform and arch for packaging

java/ortx_jni.def

@@ -0,0 +1,6 @@
+LIBRARY "onnxruntime_extensions4j_jni.dll"
+EXPORTS
+ RegisterCustomOps @1
+ AddExternalCustomOp @2
+ GetActiveOrtAPIVersion @3
+ Java_ai_onnxruntime_extensions_Utils_getNativeExtensionOperatorRegister @4

java/ortx_jni.ver

@@ -0,0 +1,8 @@
+{
+global:
+    RegisterCustomOps;
+    AddExternalCustomOp;
+    GetActiveOrtAPIVersion;
+    Java_ai_onnxruntime_extensions_Utils_getNativeExtensionOperatorRegister;
+local: *;
+};

tutorials/demo4j/README.md

@@ -1,4 +1,9 @@
 # How to start
 
-1. copy JAR package from $REPO/out/$OS/RelWithDebInfo/java/build/libs/onnxruntime-extensions-${VERSION}.jar into app/libs folder.
+1. correct the onnxruntime-extensions JAR location if needed, which is located at app/build.gradle: 16
+
+
+    `implementation fileTree(dir: '..\\..\\..\\out\\Windows\\java\\build\\libs', include: ['onnxruntime-extensions-0.*.0.jar'])
+`
+
 2. build and run this java project.

tutorials/demo4j/app/build.gradle

@@ -12,8 +12,9 @@ dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter:5.7.2'
 
     // onnxruntime and its extensions package
-    implementation 'com.microsoft.onnxruntime:onnxruntime:1.12.1'
-    implementation files('libs/onnxruntime-extensions-0.5.0.jar')
+    implementation 'com.microsoft.onnxruntime:onnxruntime:1.17.1'
+    implementation fileTree(dir: '..\\..\\..\\out\\Windows\\java\\build\\libs', include: ['onnxruntime-extensions-0.*.0.jar'])
+    // implementation fileTree(dir: '../../../out/Linux/RelWithDebInfo/java/build/libs', include: ['onnxruntime-extensions-0.*.0.jar'])
 
     // This dependency is used by the application.
     implementation 'com.google.guava:guava:30.1.1-jre'

tutorials/demo4j/app/src/main/java/demo4j/App.java

@@ -5,6 +5,7 @@
 
 import java.util.Arrays;
 import java.util.Map;
+import java.net.URISyntaxException;
 import java.nio.file.Paths;
 import ai.onnxruntime.*;
 import ai.onnxruntime.extensions.OrtxPackage;
@@ -19,8 +20,15 @@ public String inference(){
             sess_opt.registerCustomOpLibrary(OrtxPackage.getLibraryPath());
 
             /* do a quick inference on Bert Tokenizer custom ops with Ort */
-            var modelPath = Paths.get(this.getClass().getClassLoader().getResource("test_bert_tokenizer.onnx").getPath());
-            var session = env.createSession(modelPath.toString(), sess_opt);
+            var modelPath = "";
+            try {
+                modelPath = Paths.get(this.getClass().getClassLoader().getResource("test_bert_tokenizer.onnx").toURI()).toString();
+            } catch (URISyntaxException e) {
+                // handle the exception
+                e.printStackTrace();
+            }
+            var session = env.createSession(modelPath, sess_opt);
+
             var t1 = OnnxTensor.createTensor(env, new String[]{"This is a test"});
             var inputs = Map.of("text", t1);
             try (var r = session.run(inputs)) {