Fix various windows related things

Author: hadim

src/main/java/org/scijava/jupyter/commands/InstallScijavaKernel.java

@@ -23,7 +23,6 @@
 import java.nio.file.Paths;
 import java.util.Map;
 import org.scijava.Context;
-import org.scijava.ItemIO;
 import org.scijava.command.Command;
 import org.scijava.jupyter.service.JupyterService;
 import org.scijava.jupyter.utils.JupyterUtil;
@@ -33,7 +32,6 @@
 import org.scijava.plugin.Menu;
 import org.scijava.plugin.Parameter;
 import org.scijava.plugin.Plugin;
-import org.scijava.script.ScriptLanguage;
 import org.scijava.script.ScriptService;
 
 @Plugin(type = Command.class, menu = {

src/main/java/org/scijava/jupyter/utils/JupyterUtil.java

@@ -46,9 +46,12 @@ public static String createKernelJSON(String classpath, String logLevel, String
 
         String finalClasspath = "";
         finalClasspath += SystemUtil.getImageJClassPaths();
+        
+        String classPathSeparator = SystemUtil.getClassPathSeparator();
+        
         if (classpath != null) {
             if (finalClasspath.length() > 0) {
-                finalClasspath += ":" + classpath;
+                finalClasspath += classPathSeparator + classpath;
             } else {
                 finalClasspath += classpath;
             }

src/main/java/org/scijava/jupyter/utils/SystemUtil.java

@@ -17,6 +17,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.FileSystems;
 import java.nio.file.FileVisitOption;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -44,9 +45,11 @@ public static String getImageJClassPaths() {
         String classPaths = "";
 
         if (System.getProperty("imagej.dir") != null) {
-            classPaths += Paths.get(System.getProperty("imagej.dir"), "jars", "*") + ":";
-            classPaths += Paths.get(System.getProperty("imagej.dir"), "jars", "bio-formats", "*") + ":";
-            classPaths += Paths.get(System.getProperty("imagej.dir"), "plugins", "*") + ":";
+
+            String classPathSeparator = SystemUtil.getClassPathSeparator();
+            classPaths += Paths.get(System.getProperty("imagej.dir"), "jars") + FileSystems.getDefault().getSeparator() + "*" + classPathSeparator;
+            classPaths += Paths.get(System.getProperty("imagej.dir"), "jars", "bio-formats") + FileSystems.getDefault().getSeparator() + "*" + classPathSeparator;
+            classPaths += Paths.get(System.getProperty("imagej.dir"), "plugins") + FileSystems.getDefault().getSeparator() + "*" + classPathSeparator;
         }
 
         return classPaths;
@@ -65,4 +68,14 @@ public static void deleteFolderRecursively(Path rootPath, LogService log) {
         }
     }
 
+    public static String getClassPathSeparator() {
+        String classPathSeparator;
+        if (System.getProperty("os.name").toLowerCase().contains("windows")) {
+            classPathSeparator = ";";
+        } else {
+            classPathSeparator = ":";
+        }
+        return classPathSeparator;
+    }
+
 }