Illustrate bazelbuild/bazel#21119

.bazelrc

@@ -1 +1 @@
-build --java_language_version=17 --java_runtime_version=17 --tool_java_runtime_version=17 --tool_java_language_version=17
+build --java_language_version=21 --java_runtime_version=21 --tool_java_runtime_version=21 --tool_java_language_version=21

.bazelversion

@@ -1 +1 @@
-5.0.0
+7.0.2

.gitignore

@@ -0,0 +1,7 @@
+
+.eclipse/
+.vscode/
+
+*.class
+
+bazel-*

BUILD

@@ -1,5 +1,6 @@
 java_binary(
   name = "test",
+  javacopts = ["--enable-preview"],
   srcs = ["Hello.java"],
     deps = [
         ":with-multiline",
@@ -9,6 +10,7 @@ java_binary(
 
 java_library(
     name = "with-multiline",
-    srcs = glob(["Multiline.java"]),
+    srcs = ["Multiline.java"],
+    javacopts = ["--enable-preview"],
     visibility = ["//visibility:public"],
 )

Hello.java

@@ -1,7 +1,9 @@
 public class Hello {
-  public static void main(String[] args) {
-    var greeting = """
-    Hello, world""";
-    System.out.println(greeting);
-  }
+    public static void main(String[] args) {
+        var greeting = """
+                Hello, world""";
+        System.out.println(greeting);
+
+        System.out.println(Multiline.s2);
+    }
 }

MODULE.bazel

@@ -0,0 +1 @@
+# empty