Fix NPE when searching the source for the exception stack trace (#310)

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

Author: testforstephen

com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/adapter/AdapterUtils.java

@@ -68,10 +68,12 @@ public static boolean isWindows() {
      * @return the absolute file path
      */
     public static String sourceLookup(String[] sourcePaths, String sourceName) {
-        for (String path : sourcePaths) {
-            Path fullpath = Paths.get(path, sourceName);
-            if (Files.isRegularFile(fullpath)) {
-                return fullpath.toString();
+        if (sourcePaths != null) {
+            for (String path : sourcePaths) {
+                Path fullpath = Paths.get(path, sourceName);
+                if (Files.isRegularFile(fullpath)) {
+                    return fullpath.toString();
+                }
             }
         }
         return null;

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

@@ -137,6 +137,6 @@ public CompletableFuture<Response> launchInTerminal(LaunchArguments launchArgume
 
     @Override
     public void preLaunch(LaunchArguments launchArguments, IDebugAdapterContext context) {
-        // TODO Auto-generated method stub
+        context.setSourcePaths(launchArguments.sourcePaths);
     }
 }