getting core 4

HMCLAPI/src/main/java/org/jackhuang/hellominecraft/utils/system/Java.java

@@ -20,6 +20,7 @@ package org.jackhuang.hellominecraft.utils.system;
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import org.jackhuang.hellominecraft.C;
 import org.jackhuang.hellominecraft.HMCLog;
@@ -30,6 +31,19 @@ import org.jackhuang.hellominecraft.HMCLog;
  */
 public class Java {
 
+    public static final List<Java> JAVA;
+
+    static {
+        List<Java> temp = new ArrayList<>();
+        temp.add(new Java("Default", System.getProperty("java.home")));
+        temp.add(new Java("Custom", null));
+        if (OS.os() == OS.WINDOWS)
+            temp.addAll(Java.queryAllJavaHomeInWindowsByReg());
+        if (OS.os() == OS.OSX)
+            temp.addAll(Java.queryAllJDKInMac());
+        JAVA = Collections.unmodifiableList(temp);
+    }
+
     String name, home;
 
     public Java(String name, String home) {

HMCLAPI/src/main/java/org/jackhuang/hellominecraft/views/SwingUtils.java

@@ -100,9 +100,11 @@ public class SwingUtils {
     /**
      * Open URL by java.awt.Desktop
      *
-     * @param link
+     * @param link null is allowed but will be ignored
      */
     public static void openLink(String link) {
+        if (link == null)
+            return;
         try {
             java.awt.Desktop.getDesktop().browse(new URI(link));
         } catch (Throwable e) {