src/jdk.jextract/share/classes/com/sun/tools/jextract/JavaSourceFactory.java

@@ -88,16 +88,17 @@
         this.types = new HashMap<>();
         this.libraryNames = ctx.options.libraryNames;
         this.libraryPaths = ctx.options.recordLibraryPath? ctx.options.libraryPaths : null;
         this.noNativeLocations = ctx.options.noNativeLocations;
         this.global_jsb = new JavaSourceBuilder();
-        this.srcDir = Paths.get(ctx.options.srcDumpDir)
-            .resolve(headerFile.pkgName.replace('.', File.separatorChar));
+        this.srcDir = ctx.options.srcDumpDir != null?
+            Paths.get(ctx.options.srcDumpDir).resolve(headerFile.pkgName.replace('.', File.separatorChar)) :
+            null;
     }
 
     // main entry point that generates & saves .java files for the header file
-    public void generate(List<Tree> decls) {
+    public Map<String, String> generate(List<Tree> decls) {
         global_jsb.addPackagePrefix(headerFile.pkgName);
 
         Map<String, Object> header = new HashMap<>();
         header.put("path", headerFile.path.toAbsolutePath().toString());
         if (!libraryNames.isEmpty()) {

@@ -139,19 +140,25 @@
             global_jsb.addNestedType(jsb);
         }
 
         global_jsb.interfaceEnd();
         String src = global_jsb.build();
+        if (srcDir != null) {
         try {
             Files.createDirectories(srcDir);
             Path srcPath = srcDir.resolve(clsName + ".java");
             Files.write(srcPath, List.of(src));
         } catch (Exception ex) {
             handleException(ex);
         }
     }
 
+        Map<String, String> srcMap = new HashMap<>();
+        srcMap.put(headerClassName, src);
+        return srcMap;
+    }
+
     protected void handleException(Exception ex) {
         log.printError("cannot.write.class.file", headerFile.pkgName + "." + headerFile.headerClsName, ex);
         log.printStackTrace(ex);
     }