--- /dev/null
+package org.apache.lucene.util;
+
+/**
+ * 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.
+ */
+
+import java.util.Random;
+
+/**
+ * A random that tracks if its been initialized properly,
+ * and throws an exception if it hasn't.
+ */
+public class SmartRandom extends Random {
+ boolean initialized;
+
+ SmartRandom(long seed) {
+ super(seed);
+ }
+
+ @Override
+ protected int next(int bits) {
+ if (!initialized) {
+ System.err.println("!!! WARNING: test is using random from static initializer !!!");
+ Thread.dumpStack();
+ // I wish, but it causes JRE crashes
+ // throw new IllegalStateException("you cannot use this random from a static initializer in your test");
+ }
+ return super.next(bits);
+ }
+}