diff --git a/GNUmakefile b/GNUmakefile
index b853527..e97faa7 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -53,6 +53,10 @@ Performance_HEADER_FILES_INSTALL_DIR = Performance
 -include GNUmakefile.preamble
 
 include $(GNUSTEP_MAKEFILES)/library.make
+# If JIGS is installed, automatically generate Java wrappers as well.
+# Because of the '-', should not complain if java-wrapper.make can't be
+# found ... simply skip generation of java wrappers in that case.
+-include $(GNUSTEP_MAKEFILES)/java-wrapper.make
 include $(GNUSTEP_MAKEFILES)/test-tool.make
 include $(GNUSTEP_MAKEFILES)/documentation.make
 
diff --git a/Performance.jigs b/Performance.jigs
new file mode 100644
index 0000000..d7eb351
--- /dev/null
+++ b/Performance.jigs
@@ -0,0 +1,34 @@
+{ /* -*-c-*- */
+  "prerequisite libraries" = (
+    "gnustep-base"
+  );
+  types = { 
+    NSTimeInterval = double;
+  };
+  classes = (
+    {
+      "java name" = "gnu.gnustep.Performance.GSCache";
+      "objective-c name" = "GSCache";
+      "class methods" = (
+	"allInstances"
+      );
+      "instance methods" = (
+	"currentObjects",
+	"currentSize",
+	"lifetime",
+	"maxObjects",
+	"maxSize",
+	"name",
+	"objectForKey:",
+	"purge",
+	"setLifetime:",
+	"setMaxObjects:",
+	"setMaxSize:",
+	"setName:",
+	"setObject:forKey:",
+	"setObject:forKey:lifetime:",
+	"shrinkObjects:andSize:"
+      );
+    },
+  );
+}