Simplified java binding example

.gitignore

@@ -1,6 +1,8 @@
 # Binaries/Executables
 *.dll
 *.lib
+*.so
+*.dylib
 *.o
 *.class
 

Makefile

@@ -306,6 +306,7 @@ utilities:
 	$(CXX) $(CXXFLAGS) -c src/Utilities.cpp \
 		$(ZT_DEFS) $(ZT_INCLUDES) $(LIBZT_INCLUDES) $(STACK_DRIVER_DEFS)
 
+# windows DLL
 win_dll: lwip lwip_driver libzt_socket_layer utilities $(ZTO_OBJS)
 	# First we use mingw to build our DLL
 	@mkdir -p $(BUILD) obj
@@ -317,16 +318,19 @@ win_dll: lwip lwip_driver libzt_socket_layer utilities $(ZTO_OBJS)
 	# lib /machine:x64 /def:libzt.def
 	# or just execute: makelib
 
+# ordinary shared library
 shared_lib: lwip lwip_driver libzt_socket_layer utilities $(ZTO_OBJS)
 	@mkdir -p $(BUILD) obj
 	mv *.o obj
 	$(CXX) $(CXXFLAGS) -shared -o $(BUILD)/libzt.so obj/*.o
 
+# dynamic library for use with Java JNI, scala, etc
 shared_jni_lib: lwip lwip_driver libzt_socket_layer jni_socket_wrapper utilities $(ZTO_OBJS)
 	@mkdir -p $(BUILD) obj
 	mv *.o obj
-	$(CXX) $(CXXFLAGS) -shared -o $(BUILD)/libzt.so obj/*.o
+	$(CXX) $(CXXFLAGS) -dynamiclib -o $(BUILD)/libzt.dylib obj/*.o
 
+# static library
 ifeq ($(STACK_PICO),1)
 static_lib: picotcp picotcp_driver libzt_socket_layer utilities $(ZTO_OBJS)
 	@mkdir -p $(BUILD) obj

examples/bindings/java/ExampleApp.java

@@ -28,13 +28,13 @@
 
 import zerotier.*;
 
-public class MyClass {
+public class ExampleApp {
 	
     public native int loadsymbols();
     public native void startOneService();
     
 	static {
-        System.load("/Users/joseph/op/zt/libzt/build/darwin/libzt.so");
+        System.loadLibrary("zt");
     }
 
 	public static void main(String[] args) {

examples/bindings/java/Makefile

@@ -0,0 +1,18 @@
+OSTYPE=$(shell uname -s | tr '[A-Z]' '[a-z]')
+BUILD=build/$(OSTYPE)
+
+ifeq ($(OSTYPE),darwin)
+SHARED_LIB=libzt.dylib
+endif
+ifeq ($(OSTYPE),linux)
+SHARED_LIB=libzt.so
+endif
+
+example_java_app:
+	javac *.java
+
+copy_dynamic_lib:
+	cp ../../../$(BUILD)/$(SHARED_LIB) .
+
+clean:
+	-find . -type f \( -name '*.class' \) -delete	

examples/bindings/java/README.md

@@ -1,9 +1,14 @@
-Java Examples
-======
+## ZeroTier with Java via JNI
+***
 
-`make shared_jni_lib SDK_JNI=1 SDK_IPV4=1`
+To get this example project to work, do the following:
 
-Uses API described in [api/java/README.md]
- - Copy `src/ZeroTier.java` into `your_project/src/zerotier`
- - Copy `src/Address.java` into `your_project/src/zerotier`
- - Copy `libzt.jnilib` or `libzt.so` from `build/` into `your_project/lib`
+- From libzt main directory, build shared library: `make shared_jni_lib`
+- Copy the resultant dynamic library (`*.so` or `*.dylib`) from `build/` to this current directory
+- Change to this directory and `make example_java_app`
+- Run: `java -cp "." ExampleApp`
+
+
+Notes:
+
+Upon execution, it will load the libzt dynamic library via the `loadLibrary` method and begin generating an identity.

examples/bindings/java/ZeroTierHelloWorld/.classpath

@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
-		<attributes>
-			<attribute name="org.eclipse.jdt.launching.CLASSPATH_ATTR_LIBRARY_PATH_ENTRY" value="/Users/joseph/op/zt/libzt"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="lib" path="/Users/joseph/op/zt/libzt/examples/java/ZeroTierHelloWorld">
-		<attributes>
-			<attribute name="org.eclipse.jdt.launching.CLASSPATH_ATTR_LIBRARY_PATH_ENTRY" value="."/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="output" path="bin"/>
-</classpath>

examples/bindings/java/ZeroTierHelloWorld/.project

@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>ZeroTierHelloWorld</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-	</natures>
-</projectDescription>

examples/bindings/java/ZeroTierHelloWorld/.settings/org.eclipse.jdt.core.prefs

@@ -1,11 +0,0 @@
-eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
-org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.8
-org.eclipse.jdt.core.compiler.debug.lineNumber=generate
-org.eclipse.jdt.core.compiler.debug.localVariable=generate
-org.eclipse.jdt.core.compiler.debug.sourceFile=generate
-org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
-org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.source=1.8

examples/bindings/java/ZeroTierHelloWorld/README.md

@@ -1,2 +0,0 @@
-ZeroTierSDK Java API
-======

examples/bindings/java/zerotier/Address.java

@@ -24,6 +24,8 @@
  * of your own application.
  */
 
+package zerotier;
+
 import java.math.BigInteger;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;

examples/bindings/java/zerotier/ZeroTier.java

@@ -24,6 +24,10 @@
  * of your own application.
  */
 
+package zerotier;
+
+//import zerotier.*;
+
 import java.io.FileDescriptor;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;

examples/bindings/newscala/ZeroTier.java

@@ -0,0 +1,7 @@
+package zerotier;
+
+public class ZeroTier 
+{
+	public native int ztjni_socket(int family, int type, int protocol);
+    public int socket(int family, int type, int protocol) { return ztjni_socket(family, type, protocol); }
+}

examples/bindings/newscala/example.java

@@ -0,0 +1,59 @@
+/*
+ * ZeroTier SDK - Network Virtualization Everywhere
+ * Copyright (C) 2011-2017  ZeroTier, Inc.  https://www.zerotier.com/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * You can be released from the requirements of the license by purchasing
+ * a commercial license. Buying such a license is mandatory as soon as you
+ * develop commercial closed-source software that incorporates or links
+ * directly against ZeroTier software without disclosing the source code
+ * of your own application.
+ */
+
+// Simple Java example for libzt using JNI
+
+import zerotier.ZeroTier;
+
+public class example {
+	
+    public native int loadsymbols();
+    public native void startOneService();
+    
+	static {
+        System.load("/Users/joseph/op/zt/libzt/build/darwin/libzt.so");
+    }
+
+	public static void main(String[] args) {
+		
+        final ZeroTier z = new ZeroTier();
+                
+        new Thread(new Runnable() {
+            public void run() {
+            		System.out.println("starting libzt");
+            		z.ztjni_socket(2, 1, 0);
+                // start(path) will not block
+                // startjoin(path, nwid) will block
+            }
+        }).start();
+                
+        while(true)
+        {
+	        	try { Thread.sleep(3000); } 
+	        	catch (InterruptedException e) { e.printStackTrace(); }
+        }
+    }
+}