Use User's specified java home to launch debuggee (#225)

Signed-off-by: Jinbo Wang <[email protected]>

Author: testforstephen

com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/DebugSettings.java

@@ -26,6 +26,7 @@ public final class DebugSettings {
     public boolean showHex = false;
     public boolean enableHotCodeReplace = false;
     public String logLevel;
+    public String javaHome;
 
     public static DebugSettings getCurrent() {
         return current;

com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/DebugUtility.java

@@ -163,6 +163,10 @@ public static IDebugSession launch(VirtualMachineManager vmManager,
             arguments.get(ENV).setValue(encodeArrayArgument(envVars));
         }
 
+        if (StringUtils.isNotEmpty(DebugSettings.getCurrent().javaHome)) {
+            arguments.get(HOME).setValue(DebugSettings.getCurrent().javaHome);
+        }
+
         VirtualMachine vm = connector.launch(arguments);
         // workaround for JDT bug.
         // vm.version() calls org.eclipse.jdi.internal.MirrorImpl#requestVM

com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/adapter/handler/LaunchRequestHandler.java

@@ -29,6 +29,7 @@
 import org.apache.commons.lang3.StringUtils;
 
 import com.microsoft.java.debug.core.Configuration;
+import com.microsoft.java.debug.core.DebugSettings;
 import com.microsoft.java.debug.core.adapter.AdapterUtils;
 import com.microsoft.java.debug.core.adapter.ErrorCode;
 import com.microsoft.java.debug.core.adapter.IDebugAdapterContext;
@@ -99,7 +100,9 @@ protected static String[] constructLaunchCommands(LaunchArguments launchArgument
         String slash = System.getProperty("file.separator");
 
         List<String> launchCmds = new ArrayList<>();
-        launchCmds.add(System.getProperty("java.home") + slash + "bin" + slash + "java");
+        final String javaHome = StringUtils.isNotEmpty(DebugSettings.getCurrent().javaHome) ? DebugSettings.getCurrent().javaHome
+                : System.getProperty("java.home");
+        launchCmds.add(javaHome + slash + "bin" + slash + "java");
         if (StringUtils.isNotEmpty(address)) {
             launchCmds.add(String.format("-agentlib:jdwp=transport=dt_socket,server=%s,suspend=y,address=%s", serverMode ? "y" : "n", address));
         }