Add a test case to show that newer Janino versions are not friends wi…

…th Java>=16

core/src/test/java/org/apache/calcite/util/javac/JaninoCompilerTest.java

@@ -0,0 +1,79 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.calcite.util.javac;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Path;
+public class JaninoCompilerTest {
+
+  // Reproduces upstream issue from Janino https://github.com/janino-compiler/janino/issues/174
+  @Test
+  public void compile_long_method(@TempDir Path tempDir) throws Exception {
+    String code = getClassCode(getClassBody(1000));
+    JaninoCompiler compiler = new JaninoCompiler();
+    compiler.getArgs().setDestdir(tempDir.toFile().getAbsolutePath());
+    compiler.getArgs().setSource(code, "Nuke.java");
+    compiler.getArgs().setFullClassName("Nuke");
+    compiler.compile();
+
+    URL[] urls = new URL[]{tempDir.toUri().toURL()};
+    ClassLoader cl = new URLClassLoader(urls);
+    Class clazz = cl.loadClass("Nuke");
+    Object o = clazz.getDeclaredConstructor().newInstance();
+    System.out.println(o);
+  }
+
+  private static String getClassCode(String body) {
+    return "import java.util.Arrays;\n\n"
+        + "public class Nuke {"
+        + body
+        + "}";
+  }
+
+  private static String getClassBody(int numAssignments) {
+    String template = "public Object[] nuke() {\n"
+        + "\tString bloat = \"some_bloat\";\n"
+        + "\t//Lots of variables\n"
+        + "%s"
+        + "\t//Big array initialization\n"
+        + "\treturn new Object[]\n"
+        + "\t{\n"
+        + "%s"
+        + "\t};\n"
+        + "}\n"
+        + "\n"
+        + ""
+        + "public static void main(String[] args) throws Exception {"
+        + "\tSystem.out.println(Arrays.toString(new Nuke().nuke()));"
+        + "}";
+    StringBuilder assignments = new StringBuilder();
+    StringBuilder appends = new StringBuilder();
+    for (int i = 0; i < numAssignments; i++) {
+      assignments.append(String.format("\tfinal String current%s = bloat;\n", i));
+      appends.append(String.format("\t\tcurrent%s", i));
+      if (i < numAssignments - 1) {
+        appends.append(",");
+      }
+      appends.append("\n");
+    }
+    return String.format(template, assignments, appends);
+  }
+}